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diff --git a/projects/README.md b/projects/README.md
index 48909c4..24bebc6 100644
--- a/projects/README.md
+++ b/projects/README.md
@@ -1,4 +1,5 @@
 * 1.本目录用来存放每节课的基准代码；
+> （每节课lesson-x文件夹更新时间为每周一和周五晚11:00之前，一般周一和周五上午就会更新）
 
 * 2.每上完一节课，需要从TeamX的master分支更新代码仓库到本地仓库；
 
diff --git a/projects/lesson-2/Cargo.lock b/projects/lesson-2/Cargo.lock
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index 0000000..d0017e2
--- /dev/null
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diff --git a/projects/lesson-2/Cargo.toml b/projects/lesson-2/Cargo.toml
new file mode 100644
index 0000000..551c9ef
--- /dev/null
+++ b/projects/lesson-2/Cargo.toml
@@ -0,0 +1,103 @@
+[package]
+authors = ['Bryan Chen']
+build = 'build.rs'
+edition = '2018'
+name = 'substrate-kitties'
+version = '2.0.0'
+
+[build-dependencies]
+vergen = '3'
+
+[workspace]
+members = ['runtime']
+
+[dependencies]
+derive_more = '0.14.0'
+exit-future = '0.1'
+futures = '0.1'
+log = '0.4'
+parking_lot = '0.9.0'
+tokio = '0.1'
+trie-root = '0.15.2'
+
+[dependencies.babe]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.basic-authorship]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-basic-authorship'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.ctrlc]
+features = ['termination']
+version = '3.0'
+
+[dependencies.grandpa]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.inherents]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-inherents'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.network]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-network'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-kitties-runtime]
+path = 'runtime'
+
+[dependencies.primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sr-io]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-cli]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-client]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-executor]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-service]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.transaction-pool]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-transaction-pool'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[[bin]]
+name = 'substrate-kitties'
+path = 'src/main.rs'
+[profile.release]
+panic = 'unwind'
diff --git a/projects/lesson-2/LICENSE b/projects/lesson-2/LICENSE
new file mode 100644
index 0000000..cf1ab25
--- /dev/null
+++ b/projects/lesson-2/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>
diff --git a/projects/lesson-2/README.md b/projects/lesson-2/README.md
new file mode 100644
index 0000000..5a59652
--- /dev/null
+++ b/projects/lesson-2/README.md
@@ -0,0 +1,70 @@
+# Substrate Node Template
+
+A new SRML-based Substrate node, ready for hacking.
+
+## Build
+
+Install Rust:
+
+```bash
+curl https://sh.rustup.rs -sSf | sh
+```
+
+Install required tools:
+
+```bash
+./scripts/init.sh
+```
+
+Build Wasm and native code:
+
+```bash
+cargo build
+```
+
+## Run
+
+### Single node development chain
+
+You can start a development chain with:
+
+```bash
+cargo run -- --dev
+```
+
+Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+
+### Multi-node local testnet
+
+If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
+
+Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
+
+You'll need two terminal windows open.
+
+We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
+
+```bash
+cargo run -- \
+  --base-path /tmp/alice \
+  --chain=local \
+  --alice \
+  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
+
+```bash
+cargo run -- \
+  --base-path /tmp/bob \
+  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
+  --chain=local \
+  --bob \
+  --port 30334 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
diff --git a/projects/lesson-2/build.rs b/projects/lesson-2/build.rs
new file mode 100644
index 0000000..bab46f5
--- /dev/null
+++ b/projects/lesson-2/build.rs
@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}
diff --git a/projects/lesson-2/runtime/Cargo.toml b/projects/lesson-2/runtime/Cargo.toml
new file mode 100644
index 0000000..8dd7a79
--- /dev/null
+++ b/projects/lesson-2/runtime/Cargo.toml
@@ -0,0 +1,158 @@
+[features]
+default = ['std']
+no_std = []
+std = [
+    'codec/std',
+    'client/std',
+    'rstd/std',
+    'runtime-io/std',
+    'support/std',
+    'balances/std',
+    'babe/std',
+    'babe-primitives/std',
+    'executive/std',
+    'indices/std',
+    'grandpa/std',
+    'primitives/std',
+    'sr-primitives/std',
+    'system/std',
+    'timestamp/std',
+    'sudo/std',
+    'version/std',
+    'serde',
+    'safe-mix/std',
+    'offchain-primitives/std',
+    'substrate-session/std',
+]
+[build-dependencies.wasm-builder-runner]
+package = 'substrate-wasm-builder-runner'
+version = '1.0.2'
+
+[package]
+authors = ['Bryan Chen']
+edition = '2018'
+name = 'substrate-kitties-runtime'
+version = '2.0.0'
+[dependencies.babe]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.balances]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-balances'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.client]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-client'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.executive]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-executive'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.indices]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-indices'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.offchain-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-offchain-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.rstd]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-std'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.runtime-io]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-io'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.safe-mix]
+default-features = false
+version = '1.0'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0'
+
+[dependencies.sr-primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sudo]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-sudo'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.support]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-support'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.system]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-system'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.timestamp]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-timestamp'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.version]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-version'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies]
+byteorder = { version = "1.3.1", default-features = false }
\ No newline at end of file
diff --git a/projects/lesson-2/runtime/build.rs b/projects/lesson-2/runtime/build.rs
new file mode 100644
index 0000000..1ed109d
--- /dev/null
+++ b/projects/lesson-2/runtime/build.rs
@@ -0,0 +1,27 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.5"),
+		// This instructs LLD to export __heap_base as a global variable, which is used by the
+		// external memory allocator.
+		"-Clink-arg=--export=__heap_base",
+	);
+}
diff --git a/projects/lesson-2/runtime/src/lib.rs b/projects/lesson-2/runtime/src/lib.rs
new file mode 100644
index 0000000..9f01b28
--- /dev/null
+++ b/projects/lesson-2/runtime/src/lib.rs
@@ -0,0 +1,419 @@
+//! The Substrate Node Template runtime. This can be compiled with `#[no_std]`, ready for Wasm.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
+#![recursion_limit="256"]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+use rstd::prelude::*;
+use primitives::{OpaqueMetadata, crypto::key_types};
+use sr_primitives::{
+	ApplyResult, transaction_validity::TransactionValidity, generic, create_runtime_str,
+	impl_opaque_keys, AnySignature
+};
+use sr_primitives::traits::{NumberFor, BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Verify, ConvertInto};
+use sr_primitives::weights::Weight;
+use babe::{AuthorityId as BabeId};
+use grandpa::{AuthorityId as GrandpaId, AuthorityWeight as GrandpaWeight};
+use grandpa::fg_primitives::{self, ScheduledChange};
+use client::{
+	block_builder::api::{CheckInherentsResult, InherentData, self as block_builder_api},
+	runtime_api as client_api, impl_runtime_apis
+};
+use version::RuntimeVersion;
+#[cfg(feature = "std")]
+use version::NativeVersion;
+
+// A few exports that help ease life for downstream crates.
+#[cfg(any(feature = "std", test))]
+pub use sr_primitives::BuildStorage;
+pub use timestamp::Call as TimestampCall;
+pub use balances::Call as BalancesCall;
+pub use sr_primitives::{Permill, Perbill};
+pub use support::{StorageValue, construct_runtime, parameter_types};
+
+/// An index to a block.
+pub type BlockNumber = u32;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = AnySignature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
+
+/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
+/// never know...
+pub type AccountIndex = u32;
+
+/// Balance of an account.
+pub type Balance = u128;
+
+/// Index of a transaction in the chain.
+pub type Index = u32;
+
+/// A hash of some data used by the chain.
+pub type Hash = primitives::H256;
+
+/// Digest item type.
+pub type DigestItem = generic::DigestItem<Hash>;
+
+/// Used for the module template in `./template.rs`
+mod template;
+
+/// Used for the module in './substrateKitties.rs'
+mod substrateKitties;
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core datastructures.
+pub mod opaque {
+	use super::*;
+
+	pub use sr_primitives::OpaqueExtrinsic as UncheckedExtrinsic;
+
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+
+	pub type SessionHandlers = (Grandpa, Babe);
+
+	impl_opaque_keys! {
+		pub struct SessionKeys {
+			#[id(key_types::GRANDPA)]
+			pub grandpa: GrandpaId,
+			#[id(key_types::BABE)]
+			pub babe: BabeId,
+		}
+	}
+}
+
+/// This runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: create_runtime_str!("substrate-kitties"),
+	impl_name: create_runtime_str!("substrate-kitties"),
+	authoring_version: 3,
+	spec_version: 4,
+	impl_version: 4,
+	apis: RUNTIME_API_VERSIONS,
+};
+
+/// Constants for Babe.
+
+/// Since BABE is probabilistic this is the average expected block time that
+/// we are targetting. Blocks will be produced at a minimum duration defined
+/// by `SLOT_DURATION`, but some slots will not be allocated to any
+/// authority and hence no block will be produced. We expect to have this
+/// block time on average following the defined slot duration and the value
+/// of `c` configured for BABE (where `1 - c` represents the probability of
+/// a slot being empty).
+/// This value is only used indirectly to define the unit constants below
+/// that are expressed in blocks. The rest of the code should use
+/// `SLOT_DURATION` instead (like the timestamp module for calculating the
+/// minimum period).
+/// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
+
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+pub const EPOCH_DURATION_IN_BLOCKS: u32 = 10 * MINUTES;
+
+// These time units are defined in number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
+pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
+
+/// The version infromation used to identify this runtime when compiled natively.
+#[cfg(feature = "std")]
+pub fn native_version() -> NativeVersion {
+	NativeVersion {
+		runtime_version: VERSION,
+		can_author_with: Default::default(),
+	}
+}
+
+parameter_types! {
+	pub const BlockHashCount: BlockNumber = 250;
+	pub const MaximumBlockWeight: Weight = 1_000_000;
+	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	pub const MaximumBlockLength: u32 = 5 * 1024 * 1024;
+	pub const Version: RuntimeVersion = VERSION;
+}
+
+impl system::Trait for Runtime {
+	/// The identifier used to distinguish between accounts.
+	type AccountId = AccountId;
+	/// The aggregated dispatch type that is available for extrinsics.
+	type Call = Call;
+	/// The lookup mechanism to get account ID from whatever is passed in dispatchers.
+	type Lookup = Indices;
+	/// The index type for storing how many extrinsics an account has signed.
+	type Index = Index;
+	/// The index type for blocks.
+	type BlockNumber = BlockNumber;
+	/// The type for hashing blocks and tries.
+	type Hash = Hash;
+	/// The hashing algorithm used.
+	type Hashing = BlakeTwo256;
+	/// The header type.
+	type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// The ubiquitous event type.
+	type Event = Event;
+	/// Update weight (to fee) multiplier per-block.
+	type WeightMultiplierUpdate = ();
+	/// The ubiquitous origin type.
+	type Origin = Origin;
+	/// Maximum number of block number to block hash mappings to keep (oldest pruned first).
+	type BlockHashCount = BlockHashCount;
+	/// Maximum weight of each block. With a default weight system of 1byte == 1weight, 4mb is ok.
+	type MaximumBlockWeight = MaximumBlockWeight;
+	/// Maximum size of all encoded transactions (in bytes) that are allowed in one block.
+	type MaximumBlockLength = MaximumBlockLength;
+	/// Portion of the block weight that is available to all normal transactions.
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = Version;
+}
+
+parameter_types! {
+	pub const EpochDuration: u64 = EPOCH_DURATION_IN_BLOCKS as u64;
+	pub const ExpectedBlockTime: u64 = MILLISECS_PER_BLOCK;
+}
+
+impl babe::Trait for Runtime {
+	type EpochDuration = EpochDuration;
+	type ExpectedBlockTime = ExpectedBlockTime;
+}
+
+impl grandpa::Trait for Runtime {
+	type Event = Event;
+}
+
+impl indices::Trait for Runtime {
+	/// The type for recording indexing into the account enumeration. If this ever overflows, there
+	/// will be problems!
+	type AccountIndex = u32;
+	/// Use the standard means of resolving an index hint from an id.
+	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
+	/// Determine whether an account is dead.
+	type IsDeadAccount = Balances;
+	/// The ubiquitous event type.
+	type Event = Event;
+}
+
+parameter_types! {
+	pub const MinimumPeriod: u64 = 5000;
+}
+
+impl timestamp::Trait for Runtime {
+	/// A timestamp: milliseconds since the unix epoch.
+	type Moment = u64;
+	type OnTimestampSet = Babe;
+	type MinimumPeriod = MinimumPeriod;
+}
+
+parameter_types! {
+	pub const ExistentialDeposit: u128 = 500;
+	pub const TransferFee: u128 = 0;
+	pub const CreationFee: u128 = 0;
+	pub const TransactionBaseFee: u128 = 0;
+	pub const TransactionByteFee: u128 = 1;
+}
+
+impl balances::Trait for Runtime {
+	/// The type for recording an account's balance.
+	type Balance = Balance;
+	/// What to do if an account's free balance gets zeroed.
+	type OnFreeBalanceZero = ();
+	/// What to do if a new account is created.
+	type OnNewAccount = Indices;
+	/// The ubiquitous event type.
+	type Event = Event;
+	type TransactionPayment = ();
+	type DustRemoval = ();
+	type TransferPayment = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type TransferFee = TransferFee;
+	type CreationFee = CreationFee;
+	type TransactionBaseFee = TransactionBaseFee;
+	type TransactionByteFee = TransactionByteFee;
+	type WeightToFee = ConvertInto;
+}
+
+impl sudo::Trait for Runtime {
+	type Event = Event;
+	type Proposal = Call;
+}
+
+/// Used for the module template in `./template.rs`
+impl template::Trait for Runtime {
+	type Event = Event;
+}
+
+/// Used for the module file in './substrateKitties.rs'
+impl substrateKitties::Trait for Runtime {
+	type Event = Event;
+}
+
+construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = opaque::Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system::{Module, Call, Storage, Config, Event},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
+		Babe: babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
+		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
+		Indices: indices::{default, Config<T>},
+		Balances: balances::{default, Error},
+		Sudo: sudo,
+		// Used for the module template in `./template.rs`
+		TemplateModule: template::{Module, Call, Storage, Event<T>},
+
+		// Used for the module file in './substrateKitties.rs'
+		Substratekitties: substrateKitties::{Module, Call, Storage, Event<T>},
+	}
+);
+
+/// The address format for describing accounts.
+pub type Address = <Indices as StaticLookup>::Source;
+/// Block header type as expected by this runtime.
+pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+/// Block type as expected by this runtime.
+pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+/// A Block signed with a Justification
+pub type SignedBlock = generic::SignedBlock<Block>;
+/// BlockId type as expected by this runtime.
+pub type BlockId = generic::BlockId<Block>;
+/// The SignedExtension to the basic transaction logic.
+pub type SignedExtra = (
+	system::CheckVersion<Runtime>,
+	system::CheckGenesis<Runtime>,
+	system::CheckEra<Runtime>,
+	system::CheckNonce<Runtime>,
+	system::CheckWeight<Runtime>,
+	balances::TakeFees<Runtime>
+);
+/// Unchecked extrinsic type as expected by this runtime.
+pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Call, SignedExtra>;
+/// Executive: handles dispatch to the various modules.
+pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Runtime, AllModules>;
+
+impl_runtime_apis! {
+	impl client_api::Core<Block> for Runtime {
+		fn version() -> RuntimeVersion {
+			VERSION
+		}
+
+		fn execute_block(block: Block) {
+			Executive::execute_block(block)
+		}
+
+		fn initialize_block(header: &<Block as BlockT>::Header) {
+			Executive::initialize_block(header)
+		}
+	}
+
+	impl client_api::Metadata<Block> for Runtime {
+		fn metadata() -> OpaqueMetadata {
+			Runtime::metadata().into()
+		}
+	}
+
+	impl block_builder_api::BlockBuilder<Block> for Runtime {
+		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
+			Executive::apply_extrinsic(extrinsic)
+		}
+
+		fn finalize_block() -> <Block as BlockT>::Header {
+			Executive::finalize_block()
+		}
+
+		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
+			data.create_extrinsics()
+		}
+
+		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
+			data.check_extrinsics(&block)
+		}
+
+		fn random_seed() -> <Block as BlockT>::Hash {
+			System::random_seed()
+		}
+	}
+
+	impl client_api::TaggedTransactionQueue<Block> for Runtime {
+		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
+			Executive::validate_transaction(tx)
+		}
+	}
+
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
+	impl fg_primitives::GrandpaApi<Block> for Runtime {
+		fn grandpa_pending_change(digest: &DigestFor<Block>)
+			-> Option<ScheduledChange<NumberFor<Block>>>
+		{
+			Grandpa::pending_change(digest)
+		}
+
+		fn grandpa_forced_change(digest: &DigestFor<Block>)
+			-> Option<(NumberFor<Block>, ScheduledChange<NumberFor<Block>>)>
+		{
+			Grandpa::forced_change(digest)
+		}
+
+		fn grandpa_authorities() -> Vec<(GrandpaId, GrandpaWeight)> {
+			Grandpa::grandpa_authorities()
+		}
+	}
+
+	impl babe_primitives::BabeApi<Block> for Runtime {
+		fn startup_data() -> babe_primitives::BabeConfiguration {
+			// The choice of `c` parameter (where `1 - c` represents the
+			// probability of a slot being empty), is done in accordance to the
+			// slot duration and expected target block time, for safely
+			// resisting network delays of maximum two seconds.
+			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+			babe_primitives::BabeConfiguration {
+				median_required_blocks: 1000,
+				slot_duration: Babe::slot_duration(),
+				c: PRIMARY_PROBABILITY,
+			}
+		}
+
+		fn epoch() -> babe_primitives::Epoch {
+			babe_primitives::Epoch {
+				start_slot: Babe::epoch_start_slot(),
+				authorities: Babe::authorities(),
+				epoch_index: Babe::epoch_index(),
+				randomness: Babe::randomness(),
+				duration: EpochDuration::get(),
+				secondary_slots: Babe::secondary_slots().0,
+			}
+		}
+	}
+
+	impl substrate_session::SessionKeys<Block> for Runtime {
+		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
+			let seed = seed.as_ref().map(|s| rstd::str::from_utf8(&s).expect("Seed is an utf8 string"));
+			opaque::SessionKeys::generate(seed)
+		}
+	}
+}
diff --git a/projects/lesson-2/runtime/src/substrateKitties.rs b/projects/lesson-2/runtime/src/substrateKitties.rs
new file mode 100644
index 0000000..07c650b
--- /dev/null
+++ b/projects/lesson-2/runtime/src/substrateKitties.rs
@@ -0,0 +1,124 @@
+use support::{decl_storage, decl_module, decl_event, StorageValue, StorageMap, dispatch::Result, ensure};
+use system::ensure_signed;
+use sr_primitives::traits::{
+    Hash,
+};
+use codec::{Decode, Encode};
+use byteorder::{ByteOrder, BigEndian};
+
+// The balance module's configure trait.
+pub trait Trait: balances::Trait {
+    /// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// Refers to CryptoKittie's contract code
+// support we have a struct: Kitty
+// and we have a storage of map: mapping (Hash => Kitty) Kitties
+#[derive(Debug, Encode, Decode, Default, Clone, PartialEq)]
+// TODO: ??? why add this
+#[cfg_attr(feature = "std", derive(Debug))]
+pub struct Kitty<Hash, Balance> {
+    id: Hash,
+    dna: u128,
+    birthTime: u64,
+    price: Balance, 
+    generation: u64,
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as KittyStorage {
+		// Kitties storage
+        Kitties get(kitty_id): map T::Hash => Kitty<T::Hash, T::Balance>;
+        // For account id index
+        KittyOwnership get(owner): map T::Hash => Option<T::AccountId>;
+        // For kitties amount of account
+        KittyOwned get(owner_id): map T::AccountId => u64;
+
+        // For all kitties
+        KittiesAmountOfAll get(kitties_amount): u64;
+        // Kitties list
+        KittiesListOfAll get(kitty_index): map u64 => T::Hash;
+
+	}
+}
+
+// create module.
+decl_module! {
+    pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+
+        fn deposit_event() = default;
+
+        pub fn create_kitty(origin) -> Result {
+            // check sender
+            let sender = ensure_signed(origin)?;
+
+            // get sender have
+            let sender_have = <KittyOwned<T>>::get(&sender);
+
+            // set new id of account legal kitty
+            let new_kitty_id = sender_have + 1;
+
+            // calc dna of new kitty
+            let id_hash = (&sender, new_kitty_id).using_encoded(<T as system::Trait>::Hashing::hash);
+
+            let dna_hash_array = id_hash.as_ref();
+			let dna_hash = BigEndian::read_u128(&dna_hash_array[0..16]);
+
+            // require dna not added
+            ensure!(!<KittyOwnership<T>>::exists(id_hash), "Kitty Exists.");
+
+            // new kitty
+            let new_kitty = Kitty {
+                id: id_hash,
+                dna: dna_hash,
+                // birthTime: BlockTimeStamp, ?? how to get block timestamp
+                birthTime: 0,
+                price: 0, 
+                generation: 0,
+            };
+
+            // store kitty
+            Kitties::insert(id_hash, new_kitty);
+            <KittyOwnership<T>>::insert(id_hash, &sender);
+            <KittyOwned<T>>::insert(&sender, new_kitty_id);
+
+            // all kitties
+            let all_kitties_amount =  Self::kitties_amount() + 1;
+            <KittiesAmountOfAll>::put(all_kitties_amount);
+            <KittiesListOfAll<T>>::insert(all_kitties_amount, id_hash);
+
+            Self::deposit_event(RawEvent::CreateKitty(sender, id_hash));
+
+            Ok(())
+
+        }
+
+        // pub fn drop_kitty(origin, kittyId: u64, dna: Hash) -> Result {
+            // Drop kitty by account and id
+            // The dna is used to ensure
+
+            // sender
+            // let sender = ensure_signed(origin)?;
+
+            // ensure kitty's dna exists
+
+            // ensure dna is right
+
+            // drop kitty, but id not changed ?????? not good
+            // TODO: 
+
+            // Ok(())
+        // }
+    }
+}
+
+decl_event!(
+	pub enum Event<T> where <T as system::Trait>::AccountId,<T as system::Trait>::Hash {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u64` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+        CreateKitty(AccountId, Hash),
+	}
+);
diff --git a/projects/lesson-2/runtime/src/template.rs b/projects/lesson-2/runtime/src/template.rs
new file mode 100644
index 0000000..c1fa6f2
--- /dev/null
+++ b/projects/lesson-2/runtime/src/template.rs
@@ -0,0 +1,133 @@
+/// A runtime module template with necessary imports
+
+/// Feel free to remove or edit this file as needed.
+/// If you change the name of this file, make sure to update its references in runtime/src/lib.rs
+/// If you remove this file, you can remove those references
+
+
+/// For more guidance on Substrate modules, see the example module
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
+
+use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
+use system::ensure_signed;
+
+/// The module's configuration trait.
+pub trait Trait: system::Trait {
+	// TODO: Add other types and constants required configure this module.
+
+	/// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as TemplateModule {
+		// Just a dummy storage item.
+		// Here we are declaring a StorageValue, `Something` as a Option<u32>
+		// `get(something)` is the default getter which returns either the stored `u32` or `None` if nothing stored
+		Something get(something): Option<u32>;
+	}
+}
+
+// The module's dispatchable functions.
+decl_module! {
+	/// The module declaration.
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		// Initializing events
+		// this is needed only if you are using events in your module
+		fn deposit_event() = default;
+
+		// Just a dummy entry point.
+		// function that can be called by the external world as an extrinsics call
+		// takes a parameter of the type `AccountId`, stores it and emits an event
+		pub fn do_something(origin, something: u32) -> Result {
+			// TODO: You only need this if you want to check it was signed.
+			let who = ensure_signed(origin)?;
+
+			// TODO: Code to execute when something calls this.
+			// For example: the following line stores the passed in u32 in the storage
+			Something::put(something);
+
+			// here we are raising the Something event
+			Self::deposit_event(RawEvent::SomethingStored(something, who));
+			Ok(())
+		}
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where AccountId = <T as system::Trait>::AccountId {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u32` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+		SomethingStored(u32, AccountId),
+	}
+);
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, assert_ok, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type Event = ();
+	}
+	type TemplateModule = Module<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn it_works_for_default_value() {
+		with_externalities(&mut new_test_ext(), || {
+			// Just a dummy test for the dummy funtion `do_something`
+			// calling the `do_something` function with a value 42
+			assert_ok!(TemplateModule::do_something(Origin::signed(1), 42));
+			// asserting that the stored value is equal to what we stored
+			assert_eq!(TemplateModule::something(), Some(42));
+		});
+	}
+}
diff --git a/projects/lesson-2/scripts/init.sh b/projects/lesson-2/scripts/init.sh
new file mode 100644
index 0000000..cf5ecf9
--- /dev/null
+++ b/projects/lesson-2/scripts/init.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initializing WASM build environment"
+
+if [ -z $CI_PROJECT_NAME ] ; then
+   rustup update nightly
+   rustup update stable
+fi
+
+rustup target add wasm32-unknown-unknown --toolchain nightly
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
diff --git a/projects/lesson-2/src/chain_spec.rs b/projects/lesson-2/src/chain_spec.rs
new file mode 100644
index 0000000..7d2ec76
--- /dev/null
+++ b/projects/lesson-2/src/chain_spec.rs
@@ -0,0 +1,135 @@
+use primitives::{Pair, Public};
+use substrate_kitties_runtime::{
+	AccountId, BabeConfig, BalancesConfig, GenesisConfig, GrandpaConfig,
+	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, 
+};
+use babe_primitives::{AuthorityId as BabeId};
+use grandpa_primitives::{AuthorityId as GrandpaId};
+use substrate_service;
+
+// Note this is the URL for the telemetry server
+//const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+
+/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
+pub type ChainSpec = substrate_service::ChainSpec<GenesisConfig>;
+
+/// The chain specification option. This is expected to come in from the CLI and
+/// is little more than one of a number of alternatives which can easily be converted
+/// from a string (`--chain=...`) into a `ChainSpec`.
+#[derive(Clone, Debug)]
+pub enum Alternative {
+	/// Whatever the current runtime is, with just Alice as an auth.
+	Development,
+	/// Whatever the current runtime is, with simple Alice/Bob auths.
+	LocalTestnet,
+}
+
+/// Helper function to generate a crypto pair from seed
+pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
+	TPublic::Pair::from_string(&format!("//{}", seed), None)
+		.expect("static values are valid; qed")
+		.public()
+}
+
+/// Helper function to generate stash, controller and session key from seed
+pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId, GrandpaId, BabeId) {
+	(
+		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
+		get_from_seed::<AccountId>(seed),
+		get_from_seed::<GrandpaId>(seed),
+		get_from_seed::<BabeId>(seed),
+	)
+}
+
+impl Alternative {
+	/// Get an actual chain config from one of the alternatives.
+	pub(crate) fn load(self) -> Result<ChainSpec, String> {
+		Ok(match self {
+			Alternative::Development => ChainSpec::from_genesis(
+				"Development",
+				"dev",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+				],
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+			Alternative::LocalTestnet => ChainSpec::from_genesis(
+				"Local Testnet",
+				"local_testnet",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+					get_authority_keys_from_seed("Bob"),
+				], 
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+		})
+	}
+
+	pub(crate) fn from(s: &str) -> Option<Self> {
+		match s {
+			"dev" => Some(Alternative::Development),
+			"" | "local" => Some(Alternative::LocalTestnet),
+			_ => None,
+		}
+	}
+}
+
+fn testnet_genesis(initial_authorities: Vec<(AccountId, AccountId, GrandpaId, BabeId)>,
+	root_key: AccountId, 
+	endowed_accounts: Vec<AccountId>,
+	_enable_println: bool) -> GenesisConfig {
+	GenesisConfig {
+		system: Some(SystemConfig {
+			code: WASM_BINARY.to_vec(),
+			changes_trie_config: Default::default(),
+		}),
+		indices: Some(IndicesConfig {
+			ids: endowed_accounts.clone(),
+		}),
+		balances: Some(BalancesConfig {
+			balances: endowed_accounts.iter().cloned().map(|k|(k, 1 << 60)).collect(),
+			vesting: vec![],
+		}),
+		sudo: Some(SudoConfig {
+			key: root_key,
+		}),
+		babe: Some(BabeConfig {
+			authorities: initial_authorities.iter().map(|x| (x.3.clone(), 1)).collect(),
+		}),
+		grandpa: Some(GrandpaConfig {
+			authorities: initial_authorities.iter().map(|x| (x.2.clone(), 1)).collect(),
+		}),
+	}
+}
diff --git a/projects/lesson-2/src/cli.rs b/projects/lesson-2/src/cli.rs
new file mode 100644
index 0000000..f6edbb2
--- /dev/null
+++ b/projects/lesson-2/src/cli.rs
@@ -0,0 +1,112 @@
+use crate::service;
+use futures::{future, Future, sync::oneshot};
+use std::cell::RefCell;
+use tokio::runtime::Runtime;
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+use substrate_cli::{informant, parse_and_prepare, ParseAndPrepare, NoCustom};
+use substrate_service::{AbstractService, Roles as ServiceRoles};
+use crate::chain_spec;
+use log::info;
+
+/// Parse command line arguments into service configuration.
+pub fn run<I, T, E>(args: I, exit: E, version: VersionInfo) -> error::Result<()> where
+	I: IntoIterator<Item = T>,
+	T: Into<std::ffi::OsString> + Clone,
+	E: IntoExit,
+{
+	match parse_and_prepare::<NoCustom, NoCustom, _>(&version, "substrate-node", args) {
+		ParseAndPrepare::Run(cmd) => cmd.run::<(), _, _, _, _>(load_spec, exit,
+		|exit, _cli_args, _custom_args, config| {
+			info!("{}", version.name);
+			info!("  version {}", config.full_version());
+			info!("  by {}, 2017, 2018", version.author);
+			info!("Chain specification: {}", config.chain_spec.name());
+			info!("Node name: {}", config.name);
+			info!("Roles: {:?}", config.roles);
+			let runtime = Runtime::new().map_err(|e| format!("{:?}", e))?;
+			match config.roles {
+				ServiceRoles::LIGHT => run_until_exit(
+					runtime,
+				 	service::new_light(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+				_ => run_until_exit(
+					runtime,
+					service::new_full(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+			}.map_err(|e| format!("{:?}", e))
+		}),
+		ParseAndPrepare::BuildSpec(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::ExportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::ImportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::PurgeChain(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::RevertChain(cmd) => cmd.run_with_builder::<(), _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec),
+		ParseAndPrepare::CustomCommand(_) => Ok(())
+	}?;
+
+	Ok(())
+}
+
+fn load_spec(id: &str) -> Result<Option<chain_spec::ChainSpec>, String> {
+	Ok(match chain_spec::Alternative::from(id) {
+		Some(spec) => Some(spec.load()?),
+		None => None,
+	})
+}
+
+fn run_until_exit<T, E>(
+	mut runtime: Runtime,
+	service: T,
+	e: E,
+) -> error::Result<()>
+where
+	T: AbstractService,
+	E: IntoExit,
+{
+	let (exit_send, exit) = exit_future::signal();
+
+	let informant = informant::build(&service);
+	runtime.executor().spawn(exit.until(informant).map(|_| ()));
+
+	// we eagerly drop the service so that the internal exit future is fired,
+	// but we need to keep holding a reference to the global telemetry guard
+	let _telemetry = service.telemetry();
+
+	let service_res = {
+		let exit = e.into_exit().map_err(|_| error::Error::Other("Exit future failed.".into()));
+		let service = service.map_err(|err| error::Error::Service(err));
+		let select = service.select(exit).map(|_| ()).map_err(|(err, _)| err);
+		runtime.block_on(select)
+	};
+
+	exit_send.fire();
+
+	// TODO [andre]: timeout this future #1318
+	let _ = runtime.shutdown_on_idle().wait();
+
+	service_res
+}
+
+// handles ctrl-c
+pub struct Exit;
+impl IntoExit for Exit {
+	type Exit = future::MapErr<oneshot::Receiver<()>, fn(oneshot::Canceled) -> ()>;
+	fn into_exit(self) -> Self::Exit {
+		// can't use signal directly here because CtrlC takes only `Fn`.
+		let (exit_send, exit) = oneshot::channel();
+
+		let exit_send_cell = RefCell::new(Some(exit_send));
+		ctrlc::set_handler(move || {
+			let exit_send = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take();
+			if let Some(exit_send) = exit_send {
+				exit_send.send(()).expect("Error sending exit notification");
+			}
+		}).expect("Error setting Ctrl-C handler");
+
+		exit.map_err(drop)
+	}
+}
diff --git a/projects/lesson-2/src/main.rs b/projects/lesson-2/src/main.rs
new file mode 100644
index 0000000..c7a227a
--- /dev/null
+++ b/projects/lesson-2/src/main.rs
@@ -0,0 +1,28 @@
+//! Substrate Node Template CLI library.
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+mod chain_spec;
+#[macro_use]
+mod service;
+mod cli;
+
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+
+fn main() {
+	let version = VersionInfo {
+		name: "Substrate Node",
+		commit: env!("VERGEN_SHA_SHORT"),
+		version: env!("CARGO_PKG_VERSION"),
+		executable_name: "substrate-kitties",
+		author: "Bryan Chen",
+		description: "substrate-kitties",
+		support_url: "support.anonymous.an",
+	};
+
+	if let Err(e) = cli::run(::std::env::args(), cli::Exit, version) {
+		eprintln!("Fatal error: {}\n\n{:?}", e, e);
+		std::process::exit(1)
+	}
+}
diff --git a/projects/lesson-2/src/service.rs b/projects/lesson-2/src/service.rs
new file mode 100644
index 0000000..5dc689a
--- /dev/null
+++ b/projects/lesson-2/src/service.rs
@@ -0,0 +1,232 @@
+//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.
+
+use std::sync::Arc;
+use std::time::Duration;
+use substrate_client::LongestChain;
+use babe::{import_queue, start_babe, Config};
+use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
+use futures::prelude::*;
+use substrate_kitties_runtime::{self, GenesisConfig, opaque::Block, RuntimeApi, WASM_BINARY};
+use substrate_service::{error::{Error as ServiceError}, AbstractService, Configuration, ServiceBuilder};
+use transaction_pool::{self, txpool::{Pool as TransactionPool}};
+use inherents::InherentDataProviders;
+use network::construct_simple_protocol;
+use substrate_executor::native_executor_instance;
+pub use substrate_executor::NativeExecutor;
+
+// Our native executor instance.
+native_executor_instance!(
+	pub Executor,
+	substrate_kitties_runtime::api::dispatch,
+	substrate_kitties_runtime::native_version
+);
+
+construct_simple_protocol! {
+	/// Demo protocol attachment for substrate.
+	pub struct NodeProtocol where Block = Block { }
+}
+
+/// Starts a `ServiceBuilder` for a full service.
+///
+/// Use this macro if you don't actually need the full service, but just the builder in order to
+/// be able to perform chain operations.
+macro_rules! new_full_start {
+	($config:expr) => {{
+		let mut import_setup = None;
+		let inherent_data_providers = inherents::InherentDataProviders::new();
+		let mut tasks_to_spawn = None;
+
+		let builder = substrate_service::ServiceBuilder::new_full::<
+			substrate_kitties_runtime::opaque::Block, substrate_kitties_runtime::RuntimeApi, crate::service::Executor
+		>($config)?
+			.with_select_chain(|_config, backend| {
+				Ok(substrate_client::LongestChain::new(backend.clone()))
+			})?
+			.with_transaction_pool(|config, client|
+				Ok(transaction_pool::txpool::Pool::new(config, transaction_pool::ChainApi::new(client)))
+			)?
+			.with_import_queue(|_config, client, mut select_chain, transaction_pool| {
+				let select_chain = select_chain.take()
+					.ok_or_else(|| substrate_service::Error::SelectChainRequired)?;
+				let (block_import, link_half) =
+					grandpa::block_import::<_, _, _, substrate_kitties_runtime::RuntimeApi, _, _>(
+						client.clone(), client.clone(), select_chain
+					)?;
+				let justification_import = block_import.clone();
+
+				let (import_queue, babe_link, babe_block_import, pruning_task) = babe::import_queue(
+					babe::Config::get_or_compute(&*client)?,
+					block_import,
+					Some(Box::new(justification_import)),
+					None,
+					client.clone(),
+					client,
+					inherent_data_providers.clone(),
+					Some(transaction_pool)
+				)?;
+
+				import_setup = Some((babe_block_import.clone(), link_half, babe_link));
+				tasks_to_spawn = Some(vec![Box::new(pruning_task)]);
+
+				Ok(import_queue)
+			})?;
+
+		(builder, import_setup, inherent_data_providers, tasks_to_spawn)
+	}}
+}
+
+/// Builds a new service for a full client.
+pub fn new_full<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+
+	let is_authority = config.roles.is_authority();
+	let name = config.name.clone();
+	let disable_grandpa = config.disable_grandpa;
+	let force_authoring = config.force_authoring;
+
+	let (builder, mut import_setup, inherent_data_providers, mut tasks_to_spawn) = new_full_start!(config);
+
+	let service = builder.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()?;
+
+	let (block_import, link_half, babe_link) =
+		import_setup.take()
+			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
+
+	// spawn any futures that were created in the previous setup steps
+	if let Some(tasks) = tasks_to_spawn.take() {
+		for task in tasks {
+			service.spawn_task(
+				task.select(service.on_exit())
+					.map(|_| ())
+					.map_err(|_| ())
+			);
+		}
+	}
+
+	if is_authority {
+		let proposer = basic_authorship::ProposerFactory {
+			client: service.client(),
+			transaction_pool: service.transaction_pool(),
+		};
+
+		let client = service.client();
+		let select_chain = service.select_chain()
+			.ok_or(ServiceError::SelectChainRequired)?;
+
+		let babe_config = babe::BabeParams {
+			config: Config::get_or_compute(&*client)?,
+			keystore: service.keystore(),
+			client,
+			select_chain,
+			block_import,
+			env: proposer,
+			sync_oracle: service.network(),
+			inherent_data_providers: inherent_data_providers.clone(),
+			force_authoring: force_authoring,
+			time_source: babe_link,
+		};
+
+		let babe = start_babe(babe_config)?;
+		let select = babe.select(service.on_exit()).then(|_| Ok(()));
+
+		// the BABE authoring task is considered infallible, i.e. if it
+		// fails we take down the service with it.
+		service.spawn_essential_task(select);
+	}
+
+	let grandpa_config = grandpa::Config {
+		// FIXME #1578 make this available through chainspec
+		gossip_duration: Duration::from_millis(333),
+		justification_period: 4096,
+		name: Some(name),
+		keystore: Some(service.keystore()),
+	};
+
+	match (is_authority, disable_grandpa) {
+		(false, false) => {
+			// start the lightweight GRANDPA observer
+			service.spawn_task(Box::new(grandpa::run_grandpa_observer(
+				grandpa_config,
+				link_half,
+				service.network(),
+				service.on_exit(),
+			)?));
+		},
+		(true, false) => {
+			// start the full GRANDPA voter
+			let voter_config = grandpa::GrandpaParams {
+				config: grandpa_config,
+				link: link_half,
+				network: service.network(),
+				inherent_data_providers: inherent_data_providers.clone(),
+				on_exit: service.on_exit(),
+				telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
+			};
+
+			// the GRANDPA voter task is considered infallible, i.e.
+			// if it fails we take down the service with it.
+			service.spawn_essential_task(grandpa::run_grandpa_voter(voter_config)?);
+		},
+		(_, true) => {
+			grandpa::setup_disabled_grandpa(
+				service.client(),
+				&inherent_data_providers,
+				service.network(),
+			)?;
+		},
+	}
+
+	Ok(service)
+}
+
+/// Builds a new service for a light client.
+pub fn new_light<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+	let inherent_data_providers = InherentDataProviders::new();
+
+	ServiceBuilder::new_light::<Block, RuntimeApi, Executor>(config)?
+		.with_select_chain(|_config, backend| {
+			Ok(LongestChain::new(backend.clone()))
+		})?
+		.with_transaction_pool(|config, client|
+			Ok(TransactionPool::new(config, transaction_pool::ChainApi::new(client)))
+		)?
+		.with_import_queue_and_fprb(|_config, client, backend, _select_chain, transaction_pool| {
+			let fetch_checker = backend.blockchain().fetcher()
+				.upgrade()
+				.map(|fetcher| fetcher.checker().clone())
+				.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
+			let block_import = grandpa::light_block_import::<_, _, _, RuntimeApi, _>(
+				client.clone(), backend, Arc::new(fetch_checker), client.clone()
+			)?;
+
+			let finality_proof_import = block_import.clone();
+			let finality_proof_request_builder =
+				finality_proof_import.create_finality_proof_request_builder();
+
+			// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
+			let (import_queue, ..) = import_queue(
+				Config::get_or_compute(&*client)?,
+				block_import,
+				None,
+				Some(Box::new(finality_proof_import)),
+				client.clone(),
+				client,
+				inherent_data_providers.clone(),
+				Some(transaction_pool)
+			)?;
+
+			Ok((import_queue, finality_proof_request_builder))
+		})?
+		.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()
+}
diff --git a/projects/lesson-3/Cargo.lock b/projects/lesson-3/Cargo.lock
new file mode 100644
index 0000000..d0017e2
--- /dev/null
+++ b/projects/lesson-3/Cargo.lock
@@ -0,0 +1,5518 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "adler32"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "aes-ctr"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "aes-soft 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
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+"checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+"checksum wincolor 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "96f5016b18804d24db43cebf3c77269e7569b8954a8464501c216cc5e070eaa9"
+"checksum ws 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8a6f5bb86663ff4d1639408410f50bf6050367a8525d644d49a6894cd618a631"
+"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+"checksum x25519-dalek 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7ee1585dc1484373cbc1cee7aafda26634665cf449436fd6e24bfd1fad230538"
+"checksum xdg 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d089681aa106a86fade1b0128fb5daf07d5867a509ab036d99988dec80429a57"
+"checksum yamux 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "01bd67889938c48f0049fc60a77341039e6c3eaf16cb7693e6ead7c0ba701295"
+"checksum zeroize 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "45af6a010d13e4cf5b54c94ba5a2b2eba5596b9e46bf5875612d332a1f2b3f86"
+"checksum zeroize_derive 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "080616bd0e31f36095288bb0acdf1f78ef02c2fa15527d7e993f2a6c7591643e"
diff --git a/projects/lesson-3/Cargo.toml b/projects/lesson-3/Cargo.toml
new file mode 100644
index 0000000..551c9ef
--- /dev/null
+++ b/projects/lesson-3/Cargo.toml
@@ -0,0 +1,103 @@
+[package]
+authors = ['Bryan Chen']
+build = 'build.rs'
+edition = '2018'
+name = 'substrate-kitties'
+version = '2.0.0'
+
+[build-dependencies]
+vergen = '3'
+
+[workspace]
+members = ['runtime']
+
+[dependencies]
+derive_more = '0.14.0'
+exit-future = '0.1'
+futures = '0.1'
+log = '0.4'
+parking_lot = '0.9.0'
+tokio = '0.1'
+trie-root = '0.15.2'
+
+[dependencies.babe]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.basic-authorship]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-basic-authorship'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.ctrlc]
+features = ['termination']
+version = '3.0'
+
+[dependencies.grandpa]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.inherents]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-inherents'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.network]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-network'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-kitties-runtime]
+path = 'runtime'
+
+[dependencies.primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sr-io]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-cli]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-client]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-executor]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-service]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.transaction-pool]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-transaction-pool'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[[bin]]
+name = 'substrate-kitties'
+path = 'src/main.rs'
+[profile.release]
+panic = 'unwind'
diff --git a/projects/lesson-3/LICENSE b/projects/lesson-3/LICENSE
new file mode 100644
index 0000000..cf1ab25
--- /dev/null
+++ b/projects/lesson-3/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>
diff --git a/projects/lesson-3/README.md b/projects/lesson-3/README.md
new file mode 100644
index 0000000..5a59652
--- /dev/null
+++ b/projects/lesson-3/README.md
@@ -0,0 +1,70 @@
+# Substrate Node Template
+
+A new SRML-based Substrate node, ready for hacking.
+
+## Build
+
+Install Rust:
+
+```bash
+curl https://sh.rustup.rs -sSf | sh
+```
+
+Install required tools:
+
+```bash
+./scripts/init.sh
+```
+
+Build Wasm and native code:
+
+```bash
+cargo build
+```
+
+## Run
+
+### Single node development chain
+
+You can start a development chain with:
+
+```bash
+cargo run -- --dev
+```
+
+Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+
+### Multi-node local testnet
+
+If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
+
+Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
+
+You'll need two terminal windows open.
+
+We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
+
+```bash
+cargo run -- \
+  --base-path /tmp/alice \
+  --chain=local \
+  --alice \
+  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
+
+```bash
+cargo run -- \
+  --base-path /tmp/bob \
+  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
+  --chain=local \
+  --bob \
+  --port 30334 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
diff --git a/projects/lesson-3/build.rs b/projects/lesson-3/build.rs
new file mode 100644
index 0000000..bab46f5
--- /dev/null
+++ b/projects/lesson-3/build.rs
@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}
diff --git a/projects/lesson-3/runtime/Cargo.toml b/projects/lesson-3/runtime/Cargo.toml
new file mode 100644
index 0000000..8dd7a79
--- /dev/null
+++ b/projects/lesson-3/runtime/Cargo.toml
@@ -0,0 +1,158 @@
+[features]
+default = ['std']
+no_std = []
+std = [
+    'codec/std',
+    'client/std',
+    'rstd/std',
+    'runtime-io/std',
+    'support/std',
+    'balances/std',
+    'babe/std',
+    'babe-primitives/std',
+    'executive/std',
+    'indices/std',
+    'grandpa/std',
+    'primitives/std',
+    'sr-primitives/std',
+    'system/std',
+    'timestamp/std',
+    'sudo/std',
+    'version/std',
+    'serde',
+    'safe-mix/std',
+    'offchain-primitives/std',
+    'substrate-session/std',
+]
+[build-dependencies.wasm-builder-runner]
+package = 'substrate-wasm-builder-runner'
+version = '1.0.2'
+
+[package]
+authors = ['Bryan Chen']
+edition = '2018'
+name = 'substrate-kitties-runtime'
+version = '2.0.0'
+[dependencies.babe]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.balances]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-balances'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.client]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-client'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.executive]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-executive'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.indices]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-indices'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.offchain-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-offchain-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.rstd]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-std'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.runtime-io]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-io'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.safe-mix]
+default-features = false
+version = '1.0'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0'
+
+[dependencies.sr-primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sudo]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-sudo'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.support]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-support'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.system]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-system'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.timestamp]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-timestamp'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.version]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-version'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies]
+byteorder = { version = "1.3.1", default-features = false }
\ No newline at end of file
diff --git a/projects/lesson-3/runtime/build.rs b/projects/lesson-3/runtime/build.rs
new file mode 100644
index 0000000..1ed109d
--- /dev/null
+++ b/projects/lesson-3/runtime/build.rs
@@ -0,0 +1,27 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.5"),
+		// This instructs LLD to export __heap_base as a global variable, which is used by the
+		// external memory allocator.
+		"-Clink-arg=--export=__heap_base",
+	);
+}
diff --git a/projects/lesson-3/runtime/src/kitties.rs b/projects/lesson-3/runtime/src/kitties.rs
new file mode 100644
index 0000000..93e49eb
--- /dev/null
+++ b/projects/lesson-3/runtime/src/kitties.rs
@@ -0,0 +1,37 @@
+use support::{decl_module, decl_storage, StorageValue, StorageMap};
+use codec::{Encode, Decode};
+use runtime_io::blake2_128;
+use system::ensure_signed;
+
+pub trait Trait: system::Trait {
+}
+
+#[derive(Encode, Decode, Default)]
+pub struct Kitty(pub [u8; 16]);
+
+decl_storage! {
+	trait Store for Module<T: Trait> as Kitties {
+		/// Stores all the kitties, key is the kitty id / index
+		pub Kitties get(kitty): map u32 => Kitty;
+		/// Stores the total number of kitties. i.e. the next kitty index
+		pub KittiesCount get(kitties_count): u32;
+	}
+}
+
+decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		/// Create a new kitty
+		pub fn create(origin) {
+			let sender = ensure_signed(origin)?;
+			let count = Self::kitties_count();
+			if count == u32::max_value() {
+				return Err("Kitties count overflow");
+			}
+			let payload = (<system::Module<T>>::random_seed(), sender, <system::Module<T>>::extrinsic_index(), <system::Module<T>>::block_number());
+			let dna = payload.using_encoded(blake2_128);
+			let kitty = Kitty(dna);
+			Kitties::insert(count, kitty);
+			KittiesCount::put(count + 1);
+		}
+	}
+}
diff --git a/projects/lesson-3/runtime/src/lib.rs b/projects/lesson-3/runtime/src/lib.rs
new file mode 100644
index 0000000..f8a9a8a
--- /dev/null
+++ b/projects/lesson-3/runtime/src/lib.rs
@@ -0,0 +1,427 @@
+//! The Substrate Node Template runtime. This can be compiled with `#[no_std]`, ready for Wasm.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
+#![recursion_limit="256"]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+use rstd::prelude::*;
+use primitives::{OpaqueMetadata, crypto::key_types};
+use sr_primitives::{
+	ApplyResult, transaction_validity::TransactionValidity, generic, create_runtime_str,
+	impl_opaque_keys, AnySignature
+};
+use sr_primitives::traits::{NumberFor, BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Verify, ConvertInto};
+use sr_primitives::weights::Weight;
+use babe::{AuthorityId as BabeId};
+use grandpa::{AuthorityId as GrandpaId, AuthorityWeight as GrandpaWeight};
+use grandpa::fg_primitives::{self, ScheduledChange};
+use client::{
+	block_builder::api::{CheckInherentsResult, InherentData, self as block_builder_api},
+	runtime_api as client_api, impl_runtime_apis
+};
+use version::RuntimeVersion;
+#[cfg(feature = "std")]
+use version::NativeVersion;
+
+// A few exports that help ease life for downstream crates.
+#[cfg(any(feature = "std", test))]
+pub use sr_primitives::BuildStorage;
+pub use timestamp::Call as TimestampCall;
+pub use balances::Call as BalancesCall;
+pub use sr_primitives::{Permill, Perbill};
+pub use support::{StorageValue, construct_runtime, parameter_types};
+
+/// An index to a block.
+pub type BlockNumber = u32;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = AnySignature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
+
+/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
+/// never know...
+pub type AccountIndex = u32;
+
+/// Balance of an account.
+pub type Balance = u128;
+
+/// Index of a transaction in the chain.
+pub type Index = u32;
+
+/// A hash of some data used by the chain.
+pub type Hash = primitives::H256;
+
+/// Digest item type.
+pub type DigestItem = generic::DigestItem<Hash>;
+
+/// Used for the module template in `./template.rs`
+mod template;
+
+/// Used for the module kitties in `./kitties.rs`
+mod kitties;
+
+/// Used for the module in './substrateKitties.rs'
+mod substrateKitties;
+
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core datastructures.
+pub mod opaque {
+	use super::*;
+
+	pub use sr_primitives::OpaqueExtrinsic as UncheckedExtrinsic;
+
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+
+	pub type SessionHandlers = (Grandpa, Babe);
+
+	impl_opaque_keys! {
+		pub struct SessionKeys {
+			#[id(key_types::GRANDPA)]
+			pub grandpa: GrandpaId,
+			#[id(key_types::BABE)]
+			pub babe: BabeId,
+		}
+	}
+}
+
+/// This runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: create_runtime_str!("substrate-kitties"),
+	impl_name: create_runtime_str!("substrate-kitties"),
+	authoring_version: 3,
+	spec_version: 4,
+	impl_version: 4,
+	apis: RUNTIME_API_VERSIONS,
+};
+
+/// Constants for Babe.
+
+/// Since BABE is probabilistic this is the average expected block time that
+/// we are targetting. Blocks will be produced at a minimum duration defined
+/// by `SLOT_DURATION`, but some slots will not be allocated to any
+/// authority and hence no block will be produced. We expect to have this
+/// block time on average following the defined slot duration and the value
+/// of `c` configured for BABE (where `1 - c` represents the probability of
+/// a slot being empty).
+/// This value is only used indirectly to define the unit constants below
+/// that are expressed in blocks. The rest of the code should use
+/// `SLOT_DURATION` instead (like the timestamp module for calculating the
+/// minimum period).
+/// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
+
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+pub const EPOCH_DURATION_IN_BLOCKS: u32 = 10 * MINUTES;
+
+// These time units are defined in number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
+pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
+
+/// The version infromation used to identify this runtime when compiled natively.
+#[cfg(feature = "std")]
+pub fn native_version() -> NativeVersion {
+	NativeVersion {
+		runtime_version: VERSION,
+		can_author_with: Default::default(),
+	}
+}
+
+parameter_types! {
+	pub const BlockHashCount: BlockNumber = 250;
+	pub const MaximumBlockWeight: Weight = 1_000_000;
+	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	pub const MaximumBlockLength: u32 = 5 * 1024 * 1024;
+	pub const Version: RuntimeVersion = VERSION;
+}
+
+impl system::Trait for Runtime {
+	/// The identifier used to distinguish between accounts.
+	type AccountId = AccountId;
+	/// The aggregated dispatch type that is available for extrinsics.
+	type Call = Call;
+	/// The lookup mechanism to get account ID from whatever is passed in dispatchers.
+	type Lookup = Indices;
+	/// The index type for storing how many extrinsics an account has signed.
+	type Index = Index;
+	/// The index type for blocks.
+	type BlockNumber = BlockNumber;
+	/// The type for hashing blocks and tries.
+	type Hash = Hash;
+	/// The hashing algorithm used.
+	type Hashing = BlakeTwo256;
+	/// The header type.
+	type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// The ubiquitous event type.
+	type Event = Event;
+	/// Update weight (to fee) multiplier per-block.
+	type WeightMultiplierUpdate = ();
+	/// The ubiquitous origin type.
+	type Origin = Origin;
+	/// Maximum number of block number to block hash mappings to keep (oldest pruned first).
+	type BlockHashCount = BlockHashCount;
+	/// Maximum weight of each block. With a default weight system of 1byte == 1weight, 4mb is ok.
+	type MaximumBlockWeight = MaximumBlockWeight;
+	/// Maximum size of all encoded transactions (in bytes) that are allowed in one block.
+	type MaximumBlockLength = MaximumBlockLength;
+	/// Portion of the block weight that is available to all normal transactions.
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = Version;
+}
+
+parameter_types! {
+	pub const EpochDuration: u64 = EPOCH_DURATION_IN_BLOCKS as u64;
+	pub const ExpectedBlockTime: u64 = MILLISECS_PER_BLOCK;
+}
+
+impl babe::Trait for Runtime {
+	type EpochDuration = EpochDuration;
+	type ExpectedBlockTime = ExpectedBlockTime;
+}
+
+impl grandpa::Trait for Runtime {
+	type Event = Event;
+}
+
+impl indices::Trait for Runtime {
+	/// The type for recording indexing into the account enumeration. If this ever overflows, there
+	/// will be problems!
+	type AccountIndex = u32;
+	/// Use the standard means of resolving an index hint from an id.
+	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
+	/// Determine whether an account is dead.
+	type IsDeadAccount = Balances;
+	/// The ubiquitous event type.
+	type Event = Event;
+}
+
+parameter_types! {
+	pub const MinimumPeriod: u64 = 1000;
+}
+
+impl timestamp::Trait for Runtime {
+	/// A timestamp: milliseconds since the unix epoch.
+	type Moment = u64;
+	type OnTimestampSet = Babe;
+	type MinimumPeriod = MinimumPeriod;
+}
+
+parameter_types! {
+	pub const ExistentialDeposit: u128 = 500;
+	pub const TransferFee: u128 = 0;
+	pub const CreationFee: u128 = 0;
+	pub const TransactionBaseFee: u128 = 0;
+	pub const TransactionByteFee: u128 = 1;
+}
+
+impl balances::Trait for Runtime {
+	/// The type for recording an account's balance.
+	type Balance = Balance;
+	/// What to do if an account's free balance gets zeroed.
+	type OnFreeBalanceZero = ();
+	/// What to do if a new account is created.
+	type OnNewAccount = Indices;
+	/// The ubiquitous event type.
+	type Event = Event;
+	type TransactionPayment = ();
+	type DustRemoval = ();
+	type TransferPayment = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type TransferFee = TransferFee;
+	type CreationFee = CreationFee;
+	type TransactionBaseFee = TransactionBaseFee;
+	type TransactionByteFee = TransactionByteFee;
+	type WeightToFee = ConvertInto;
+}
+
+impl sudo::Trait for Runtime {
+	type Event = Event;
+	type Proposal = Call;
+}
+
+/// Used for the module template in `./template.rs`
+impl template::Trait for Runtime {
+	type Event = Event;
+}
+
+impl kitties::Trait for Runtime {
+}
+
+/// Used for the module file in './substrateKitties.rs'
+impl substrateKitties::Trait for Runtime {
+	type Event = Event;
+}
+
+construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = opaque::Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system::{Module, Call, Storage, Config, Event},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
+		Babe: babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
+		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
+		Indices: indices::{default, Config<T>},
+		Balances: balances::{default, Error},
+		Sudo: sudo,
+		// Used for the module template in `./template.rs`
+		TemplateModule: template::{Module, Call, Storage, Event<T>},
+		// Substrate Kitties module
+		Kitties: kitties::{Module, Storage, Call},
+		// Used for the module file in './substrateKitties.rs'
+		Substratekitties: substrateKitties::{Module, Call, Storage, Event<T>},
+	}
+);
+
+/// The address format for describing accounts.
+pub type Address = <Indices as StaticLookup>::Source;
+/// Block header type as expected by this runtime.
+pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+/// Block type as expected by this runtime.
+pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+/// A Block signed with a Justification
+pub type SignedBlock = generic::SignedBlock<Block>;
+/// BlockId type as expected by this runtime.
+pub type BlockId = generic::BlockId<Block>;
+/// The SignedExtension to the basic transaction logic.
+pub type SignedExtra = (
+	system::CheckVersion<Runtime>,
+	system::CheckGenesis<Runtime>,
+	system::CheckEra<Runtime>,
+	system::CheckNonce<Runtime>,
+	system::CheckWeight<Runtime>,
+	balances::TakeFees<Runtime>
+);
+/// Unchecked extrinsic type as expected by this runtime.
+pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Call, SignedExtra>;
+/// Executive: handles dispatch to the various modules.
+pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Runtime, AllModules>;
+
+impl_runtime_apis! {
+	impl client_api::Core<Block> for Runtime {
+		fn version() -> RuntimeVersion {
+			VERSION
+		}
+
+		fn execute_block(block: Block) {
+			Executive::execute_block(block)
+		}
+
+		fn initialize_block(header: &<Block as BlockT>::Header) {
+			Executive::initialize_block(header)
+		}
+	}
+
+	impl client_api::Metadata<Block> for Runtime {
+		fn metadata() -> OpaqueMetadata {
+			Runtime::metadata().into()
+		}
+	}
+
+	impl block_builder_api::BlockBuilder<Block> for Runtime {
+		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
+			Executive::apply_extrinsic(extrinsic)
+		}
+
+		fn finalize_block() -> <Block as BlockT>::Header {
+			Executive::finalize_block()
+		}
+
+		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
+			data.create_extrinsics()
+		}
+
+		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
+			data.check_extrinsics(&block)
+		}
+
+		fn random_seed() -> <Block as BlockT>::Hash {
+			System::random_seed()
+		}
+	}
+
+	impl client_api::TaggedTransactionQueue<Block> for Runtime {
+		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
+			Executive::validate_transaction(tx)
+		}
+	}
+
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
+	impl fg_primitives::GrandpaApi<Block> for Runtime {
+		fn grandpa_pending_change(digest: &DigestFor<Block>)
+			-> Option<ScheduledChange<NumberFor<Block>>>
+		{
+			Grandpa::pending_change(digest)
+		}
+
+		fn grandpa_forced_change(digest: &DigestFor<Block>)
+			-> Option<(NumberFor<Block>, ScheduledChange<NumberFor<Block>>)>
+		{
+			Grandpa::forced_change(digest)
+		}
+
+		fn grandpa_authorities() -> Vec<(GrandpaId, GrandpaWeight)> {
+			Grandpa::grandpa_authorities()
+		}
+	}
+
+	impl babe_primitives::BabeApi<Block> for Runtime {
+		fn startup_data() -> babe_primitives::BabeConfiguration {
+			// The choice of `c` parameter (where `1 - c` represents the
+			// probability of a slot being empty), is done in accordance to the
+			// slot duration and expected target block time, for safely
+			// resisting network delays of maximum two seconds.
+			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+			babe_primitives::BabeConfiguration {
+				median_required_blocks: 1000,
+				slot_duration: Babe::slot_duration(),
+				c: PRIMARY_PROBABILITY,
+			}
+		}
+
+		fn epoch() -> babe_primitives::Epoch {
+			babe_primitives::Epoch {
+				start_slot: Babe::epoch_start_slot(),
+				authorities: Babe::authorities(),
+				epoch_index: Babe::epoch_index(),
+				randomness: Babe::randomness(),
+				duration: EpochDuration::get(),
+				secondary_slots: Babe::secondary_slots().0,
+			}
+		}
+	}
+
+	impl substrate_session::SessionKeys<Block> for Runtime {
+		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
+			let seed = seed.as_ref().map(|s| rstd::str::from_utf8(&s).expect("Seed is an utf8 string"));
+			opaque::SessionKeys::generate(seed)
+		}
+	}
+}
diff --git a/projects/lesson-3/runtime/src/substrateKitties.rs b/projects/lesson-3/runtime/src/substrateKitties.rs
new file mode 100644
index 0000000..0bf15c2
--- /dev/null
+++ b/projects/lesson-3/runtime/src/substrateKitties.rs
@@ -0,0 +1,184 @@
+use support::{decl_storage, decl_module, decl_event, StorageValue, StorageMap, dispatch::Result, ensure};
+use system::ensure_signed;
+use sr_primitives::traits::{
+    Hash,
+};
+use codec::{Decode, Encode};
+use byteorder::{ByteOrder, BigEndian};
+
+// The balance module's configure trait.
+pub trait Trait: balances::Trait {
+    /// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// Refers to CryptoKittie's contract code
+// support we have a struct: Kitty
+// and we have a storage of map: mapping (Hash => Kitty) Kitties
+#[derive(Debug, Encode, Decode, Default, Clone, PartialEq)]
+// TODO: ??? why add this
+#[cfg_attr(feature = "std", derive(Debug))]
+pub struct Kitty<Hash, Balance> {
+    id: Hash,
+    dna: u128,
+    birthTime: u64,
+    price: Balance, 
+    generation: u64,
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as KittyStorage {
+		// Kitties storage
+        Kitties get(kitty_by_id): map T::Hash => Kitty<T::Hash, T::Balance>;
+        // For account id index
+        KittyOwnership get(owner): map T::Hash => Option<T::AccountId>;
+        // For kitties amount of account
+        KittyOwned get(owner_id): map T::AccountId => u64;
+
+        // For all kitties
+        KittiesAmountOfAll get(kitties_amount): u64;
+        // Kitties list
+        KittiesListOfAll get(kitty_index): map u64 => T::Hash;
+
+	}
+}
+
+// create module.
+decl_module! {
+    pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+
+        fn deposit_event() = default;
+
+        pub fn create_kitty(origin) -> Result {
+            // check sender
+            let sender = ensure_signed(origin)?;
+
+            // get sender have
+            // let sender_have = <KittyOwned<T>>::get(&sender);
+            let sender_have = Self::owner_id(&sender);
+
+            // set new id of account legal kitty
+            let new_kitty_id = sender_have + 1;
+
+            // calc dna of new kitty
+            let id_hash = (&sender, new_kitty_id).using_encoded(<T as system::Trait>::Hashing::hash);
+
+            let dna_hash_array = id_hash.as_ref();
+			let dna_hash = BigEndian::read_u128(&dna_hash_array[0..16]);
+
+            
+
+            // new kitty
+            let new_kitty = Kitty {
+                id: id_hash,
+                dna: dna_hash,
+                // birthTime: BlockTimeStamp, ?? how to get block timestamp
+                birthTime: 0,
+                price: 0, 
+                generation: 0,
+            };
+
+            Self::mint_kitty(sender, new_kitty)?;
+
+            Ok(())
+
+        }
+
+        // pub fn drop_kitty(origin, kittyId: u64, dna: Hash) -> Result {
+            // Drop kitty by account and id
+            // The dna is used to ensure
+
+            // sender
+            // let sender = ensure_signed(origin)?;
+
+            // ensure kitty's dna exists
+
+            // ensure dna is right
+
+            // drop kitty, but id not changed ?????? not good
+            // TODO: 
+
+            // Ok(())
+        // }
+
+        pub fn breed_kitty(origin, parents_hash_1: T::Hash, parents_hash_2: T::Hash) -> Result {
+            // breed kitty from two kitties.
+
+            // ensure sender.
+            let sender = ensure_signed(origin)?;
+
+            // get parents from storage
+            let parents_id_1 = Self::kitty_by_id(parents_hash_1);
+            let parents_id_2 = Self::kitty_by_id(parents_hash_2);
+
+            // init child kitty's dna
+            let mut child_kitty_dna = parents_id_1.dna;
+            for (index, (parents_id_2_dna_ele, r)) in parents_id_2.dna.as_ref().iter().zip(dna_hash.as_ref().iter()).enumerate() {
+                if *parents_id_2_dna_ele %2 == 0 {
+                    child_kitty_dna.as_mut()[i] = *dna_2_element;
+                }
+            }
+
+            // get sender have
+            let sender_have = Self::owner_id(&sender);
+
+            // set new id of account legal kitty
+            let new_kitty_id = sender_have + 1;
+
+            // calc id hash
+            let id_hash = (&sender, new_kitty_id).using_encoded(<T as system::Trait>::Hashing::hash);
+
+            // init child kitty
+            let child_kitty = Kitty {
+                id: id_hash,
+                dna: child_kitty_dna,
+                // birthTime: BlockTimeStamp, ?? how to get block timestamp
+                birthTime: 0,
+                price: 0, 
+                generation: 0,
+            }
+
+            Self::mint_kitty(sender, child_kitty)?;
+
+            Ok(())
+            
+
+        }
+    }
+}
+
+decl_event!(
+	pub enum Event<T> where <T as system::Trait>::AccountId,<T as system::Trait>::Hash {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u64` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+        CreateKitty(AccountId, Hash),
+	}
+);
+
+// add mint kitty impl
+impl<T: Trait> Module<T> {
+    fn mint_kitty(owner: T::AccountId, new_kitty: Kitty<T::Hash, T::Balance>) -> Result {
+        // get kitty id
+        let id_hash = new_kitty.id;
+        // get kitty dna
+        let dna = new_kitty.dna;
+        // require dna not added
+        ensure!(!<KittyOwnership<T>>::exists(id_hash), "Kitty Exists.");
+        
+        // store kitty
+        Kitties::insert(id_hash, child_kitty);
+        <KittyOwnership<T>>::insert(id_hash, &owner);
+        <KittyOwned<T>>::insert(&owner, new_kitty_id);
+
+        // all kitties
+        let all_kitties_amount =  Self::kitties_amount() + 1;
+        <KittiesAmountOfAll>::put(all_kitties_amount);
+        <KittiesListOfAll<T>>::insert(all_kitties_amount, id_hash);
+
+        Self::deposit_event(RawEvent::CreateKitty(owner, id_hash));
+
+        Ok(())
+    }
+}
diff --git a/projects/lesson-3/runtime/src/template.rs b/projects/lesson-3/runtime/src/template.rs
new file mode 100644
index 0000000..c1fa6f2
--- /dev/null
+++ b/projects/lesson-3/runtime/src/template.rs
@@ -0,0 +1,133 @@
+/// A runtime module template with necessary imports
+
+/// Feel free to remove or edit this file as needed.
+/// If you change the name of this file, make sure to update its references in runtime/src/lib.rs
+/// If you remove this file, you can remove those references
+
+
+/// For more guidance on Substrate modules, see the example module
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
+
+use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
+use system::ensure_signed;
+
+/// The module's configuration trait.
+pub trait Trait: system::Trait {
+	// TODO: Add other types and constants required configure this module.
+
+	/// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as TemplateModule {
+		// Just a dummy storage item.
+		// Here we are declaring a StorageValue, `Something` as a Option<u32>
+		// `get(something)` is the default getter which returns either the stored `u32` or `None` if nothing stored
+		Something get(something): Option<u32>;
+	}
+}
+
+// The module's dispatchable functions.
+decl_module! {
+	/// The module declaration.
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		// Initializing events
+		// this is needed only if you are using events in your module
+		fn deposit_event() = default;
+
+		// Just a dummy entry point.
+		// function that can be called by the external world as an extrinsics call
+		// takes a parameter of the type `AccountId`, stores it and emits an event
+		pub fn do_something(origin, something: u32) -> Result {
+			// TODO: You only need this if you want to check it was signed.
+			let who = ensure_signed(origin)?;
+
+			// TODO: Code to execute when something calls this.
+			// For example: the following line stores the passed in u32 in the storage
+			Something::put(something);
+
+			// here we are raising the Something event
+			Self::deposit_event(RawEvent::SomethingStored(something, who));
+			Ok(())
+		}
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where AccountId = <T as system::Trait>::AccountId {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u32` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+		SomethingStored(u32, AccountId),
+	}
+);
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, assert_ok, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type Event = ();
+	}
+	type TemplateModule = Module<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn it_works_for_default_value() {
+		with_externalities(&mut new_test_ext(), || {
+			// Just a dummy test for the dummy funtion `do_something`
+			// calling the `do_something` function with a value 42
+			assert_ok!(TemplateModule::do_something(Origin::signed(1), 42));
+			// asserting that the stored value is equal to what we stored
+			assert_eq!(TemplateModule::something(), Some(42));
+		});
+	}
+}
diff --git a/projects/lesson-3/scripts/init.sh b/projects/lesson-3/scripts/init.sh
new file mode 100644
index 0000000..cf5ecf9
--- /dev/null
+++ b/projects/lesson-3/scripts/init.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initializing WASM build environment"
+
+if [ -z $CI_PROJECT_NAME ] ; then
+   rustup update nightly
+   rustup update stable
+fi
+
+rustup target add wasm32-unknown-unknown --toolchain nightly
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
diff --git a/projects/lesson-3/scripts/restart.sh b/projects/lesson-3/scripts/restart.sh
new file mode 100644
index 0000000..42e69dc
--- /dev/null
+++ b/projects/lesson-3/scripts/restart.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+SKIP_WASM_BUILD= cargo check
+WASM_BUILD_TYPE=release cargo run -- purge-chain --dev -y
+WASM_BUILD_TYPE=release cargo run -- --dev
\ No newline at end of file
diff --git a/projects/lesson-3/src/chain_spec.rs b/projects/lesson-3/src/chain_spec.rs
new file mode 100644
index 0000000..a4ef17a
--- /dev/null
+++ b/projects/lesson-3/src/chain_spec.rs
@@ -0,0 +1,143 @@
+use primitives::{Pair, Public};
+use substrate_kitties_runtime::{
+	AccountId, BabeConfig, BalancesConfig, GenesisConfig, GrandpaConfig,
+	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, 
+};
+use babe_primitives::{AuthorityId as BabeId};
+use grandpa_primitives::{AuthorityId as GrandpaId};
+use substrate_service;
+
+// Note this is the URL for the telemetry server
+//const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+
+/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
+pub type ChainSpec = substrate_service::ChainSpec<GenesisConfig>;
+
+/// The chain specification option. This is expected to come in from the CLI and
+/// is little more than one of a number of alternatives which can easily be converted
+/// from a string (`--chain=...`) into a `ChainSpec`.
+#[derive(Clone, Debug)]
+pub enum Alternative {
+	/// Whatever the current runtime is, with just Alice as an auth.
+	Development,
+	/// Whatever the current runtime is, with simple Alice/Bob auths.
+	LocalTestnet,
+}
+
+/// Helper function to generate a crypto pair from seed
+pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
+	TPublic::Pair::from_string(&format!("//{}", seed), None)
+		.expect("static values are valid; qed")
+		.public()
+}
+
+/// Helper function to generate stash, controller and session key from seed
+pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId, GrandpaId, BabeId) {
+	(
+		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
+		get_from_seed::<AccountId>(seed),
+		get_from_seed::<GrandpaId>(seed),
+		get_from_seed::<BabeId>(seed),
+	)
+}
+
+impl Alternative {
+	/// Get an actual chain config from one of the alternatives.
+	pub(crate) fn load(self) -> Result<ChainSpec, String> {
+		Ok(match self {
+			Alternative::Development => ChainSpec::from_genesis(
+				"Development",
+				"dev",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+				],
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+			Alternative::LocalTestnet => ChainSpec::from_genesis(
+				"Local Testnet",
+				"local_testnet",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+					get_authority_keys_from_seed("Bob"),
+				], 
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+		})
+	}
+
+	pub(crate) fn from(s: &str) -> Option<Self> {
+		match s {
+			"dev" => Some(Alternative::Development),
+			"" | "local" => Some(Alternative::LocalTestnet),
+			_ => None,
+		}
+	}
+}
+
+fn testnet_genesis(initial_authorities: Vec<(AccountId, AccountId, GrandpaId, BabeId)>,
+	root_key: AccountId, 
+	endowed_accounts: Vec<AccountId>,
+	_enable_println: bool) -> GenesisConfig {
+	GenesisConfig {
+		system: Some(SystemConfig {
+			code: WASM_BINARY.to_vec(),
+			changes_trie_config: Default::default(),
+		}),
+		indices: Some(IndicesConfig {
+			ids: endowed_accounts.clone(),
+		}),
+		balances: Some(BalancesConfig {
+			balances: endowed_accounts.iter().cloned().map(|k|(k, 1 << 60)).collect(),
+			vesting: vec![],
+		}),
+		sudo: Some(SudoConfig {
+			key: root_key,
+		}),
+		babe: Some(BabeConfig {
+			authorities: initial_authorities.iter().map(|x| (x.3.clone(), 1)).collect(),
+		}),
+		grandpa: Some(GrandpaConfig {
+			authorities: initial_authorities.iter().map(|x| (x.2.clone(), 1)).collect(),
+		}),
+	}
+}
diff --git a/projects/lesson-3/src/cli.rs b/projects/lesson-3/src/cli.rs
new file mode 100644
index 0000000..f6edbb2
--- /dev/null
+++ b/projects/lesson-3/src/cli.rs
@@ -0,0 +1,112 @@
+use crate::service;
+use futures::{future, Future, sync::oneshot};
+use std::cell::RefCell;
+use tokio::runtime::Runtime;
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+use substrate_cli::{informant, parse_and_prepare, ParseAndPrepare, NoCustom};
+use substrate_service::{AbstractService, Roles as ServiceRoles};
+use crate::chain_spec;
+use log::info;
+
+/// Parse command line arguments into service configuration.
+pub fn run<I, T, E>(args: I, exit: E, version: VersionInfo) -> error::Result<()> where
+	I: IntoIterator<Item = T>,
+	T: Into<std::ffi::OsString> + Clone,
+	E: IntoExit,
+{
+	match parse_and_prepare::<NoCustom, NoCustom, _>(&version, "substrate-node", args) {
+		ParseAndPrepare::Run(cmd) => cmd.run::<(), _, _, _, _>(load_spec, exit,
+		|exit, _cli_args, _custom_args, config| {
+			info!("{}", version.name);
+			info!("  version {}", config.full_version());
+			info!("  by {}, 2017, 2018", version.author);
+			info!("Chain specification: {}", config.chain_spec.name());
+			info!("Node name: {}", config.name);
+			info!("Roles: {:?}", config.roles);
+			let runtime = Runtime::new().map_err(|e| format!("{:?}", e))?;
+			match config.roles {
+				ServiceRoles::LIGHT => run_until_exit(
+					runtime,
+				 	service::new_light(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+				_ => run_until_exit(
+					runtime,
+					service::new_full(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+			}.map_err(|e| format!("{:?}", e))
+		}),
+		ParseAndPrepare::BuildSpec(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::ExportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::ImportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::PurgeChain(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::RevertChain(cmd) => cmd.run_with_builder::<(), _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec),
+		ParseAndPrepare::CustomCommand(_) => Ok(())
+	}?;
+
+	Ok(())
+}
+
+fn load_spec(id: &str) -> Result<Option<chain_spec::ChainSpec>, String> {
+	Ok(match chain_spec::Alternative::from(id) {
+		Some(spec) => Some(spec.load()?),
+		None => None,
+	})
+}
+
+fn run_until_exit<T, E>(
+	mut runtime: Runtime,
+	service: T,
+	e: E,
+) -> error::Result<()>
+where
+	T: AbstractService,
+	E: IntoExit,
+{
+	let (exit_send, exit) = exit_future::signal();
+
+	let informant = informant::build(&service);
+	runtime.executor().spawn(exit.until(informant).map(|_| ()));
+
+	// we eagerly drop the service so that the internal exit future is fired,
+	// but we need to keep holding a reference to the global telemetry guard
+	let _telemetry = service.telemetry();
+
+	let service_res = {
+		let exit = e.into_exit().map_err(|_| error::Error::Other("Exit future failed.".into()));
+		let service = service.map_err(|err| error::Error::Service(err));
+		let select = service.select(exit).map(|_| ()).map_err(|(err, _)| err);
+		runtime.block_on(select)
+	};
+
+	exit_send.fire();
+
+	// TODO [andre]: timeout this future #1318
+	let _ = runtime.shutdown_on_idle().wait();
+
+	service_res
+}
+
+// handles ctrl-c
+pub struct Exit;
+impl IntoExit for Exit {
+	type Exit = future::MapErr<oneshot::Receiver<()>, fn(oneshot::Canceled) -> ()>;
+	fn into_exit(self) -> Self::Exit {
+		// can't use signal directly here because CtrlC takes only `Fn`.
+		let (exit_send, exit) = oneshot::channel();
+
+		let exit_send_cell = RefCell::new(Some(exit_send));
+		ctrlc::set_handler(move || {
+			let exit_send = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take();
+			if let Some(exit_send) = exit_send {
+				exit_send.send(()).expect("Error sending exit notification");
+			}
+		}).expect("Error setting Ctrl-C handler");
+
+		exit.map_err(drop)
+	}
+}
diff --git a/projects/lesson-3/src/main.rs b/projects/lesson-3/src/main.rs
new file mode 100644
index 0000000..c7a227a
--- /dev/null
+++ b/projects/lesson-3/src/main.rs
@@ -0,0 +1,28 @@
+//! Substrate Node Template CLI library.
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+mod chain_spec;
+#[macro_use]
+mod service;
+mod cli;
+
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+
+fn main() {
+	let version = VersionInfo {
+		name: "Substrate Node",
+		commit: env!("VERGEN_SHA_SHORT"),
+		version: env!("CARGO_PKG_VERSION"),
+		executable_name: "substrate-kitties",
+		author: "Bryan Chen",
+		description: "substrate-kitties",
+		support_url: "support.anonymous.an",
+	};
+
+	if let Err(e) = cli::run(::std::env::args(), cli::Exit, version) {
+		eprintln!("Fatal error: {}\n\n{:?}", e, e);
+		std::process::exit(1)
+	}
+}
diff --git a/projects/lesson-3/src/service.rs b/projects/lesson-3/src/service.rs
new file mode 100644
index 0000000..242cd9d
--- /dev/null
+++ b/projects/lesson-3/src/service.rs
@@ -0,0 +1,232 @@
+//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.
+
+use std::sync::Arc;
+use std::time::Duration;
+use substrate_client::LongestChain;
+use babe::{import_queue, start_babe, Config};
+use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
+use futures::prelude::*;
+use substrate_kitties_runtime::{self, GenesisConfig, opaque::Block, RuntimeApi};
+use substrate_service::{error::{Error as ServiceError}, AbstractService, Configuration, ServiceBuilder};
+use transaction_pool::{self, txpool::{Pool as TransactionPool}};
+use inherents::InherentDataProviders;
+use network::construct_simple_protocol;
+use substrate_executor::native_executor_instance;
+pub use substrate_executor::NativeExecutor;
+
+// Our native executor instance.
+native_executor_instance!(
+	pub Executor,
+	substrate_kitties_runtime::api::dispatch,
+	substrate_kitties_runtime::native_version
+);
+
+construct_simple_protocol! {
+	/// Demo protocol attachment for substrate.
+	pub struct NodeProtocol where Block = Block { }
+}
+
+/// Starts a `ServiceBuilder` for a full service.
+///
+/// Use this macro if you don't actually need the full service, but just the builder in order to
+/// be able to perform chain operations.
+macro_rules! new_full_start {
+	($config:expr) => {{
+		let mut import_setup = None;
+		let inherent_data_providers = inherents::InherentDataProviders::new();
+		let mut tasks_to_spawn = None;
+
+		let builder = substrate_service::ServiceBuilder::new_full::<
+			substrate_kitties_runtime::opaque::Block, substrate_kitties_runtime::RuntimeApi, crate::service::Executor
+		>($config)?
+			.with_select_chain(|_config, backend| {
+				Ok(substrate_client::LongestChain::new(backend.clone()))
+			})?
+			.with_transaction_pool(|config, client|
+				Ok(transaction_pool::txpool::Pool::new(config, transaction_pool::ChainApi::new(client)))
+			)?
+			.with_import_queue(|_config, client, mut select_chain, transaction_pool| {
+				let select_chain = select_chain.take()
+					.ok_or_else(|| substrate_service::Error::SelectChainRequired)?;
+				let (block_import, link_half) =
+					grandpa::block_import::<_, _, _, substrate_kitties_runtime::RuntimeApi, _, _>(
+						client.clone(), client.clone(), select_chain
+					)?;
+				let justification_import = block_import.clone();
+
+				let (import_queue, babe_link, babe_block_import, pruning_task) = babe::import_queue(
+					babe::Config::get_or_compute(&*client)?,
+					block_import,
+					Some(Box::new(justification_import)),
+					None,
+					client.clone(),
+					client,
+					inherent_data_providers.clone(),
+					Some(transaction_pool)
+				)?;
+
+				import_setup = Some((babe_block_import.clone(), link_half, babe_link));
+				tasks_to_spawn = Some(vec![Box::new(pruning_task)]);
+
+				Ok(import_queue)
+			})?;
+
+		(builder, import_setup, inherent_data_providers, tasks_to_spawn)
+	}}
+}
+
+/// Builds a new service for a full client.
+pub fn new_full<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+
+	let is_authority = config.roles.is_authority();
+	let name = config.name.clone();
+	let disable_grandpa = config.disable_grandpa;
+	let force_authoring = config.force_authoring;
+
+	let (builder, mut import_setup, inherent_data_providers, mut tasks_to_spawn) = new_full_start!(config);
+
+	let service = builder.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()?;
+
+	let (block_import, link_half, babe_link) =
+		import_setup.take()
+			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
+
+	// spawn any futures that were created in the previous setup steps
+	if let Some(tasks) = tasks_to_spawn.take() {
+		for task in tasks {
+			service.spawn_task(
+				task.select(service.on_exit())
+					.map(|_| ())
+					.map_err(|_| ())
+			);
+		}
+	}
+
+	if is_authority {
+		let proposer = basic_authorship::ProposerFactory {
+			client: service.client(),
+			transaction_pool: service.transaction_pool(),
+		};
+
+		let client = service.client();
+		let select_chain = service.select_chain()
+			.ok_or(ServiceError::SelectChainRequired)?;
+
+		let babe_config = babe::BabeParams {
+			config: Config::get_or_compute(&*client)?,
+			keystore: service.keystore(),
+			client,
+			select_chain,
+			block_import,
+			env: proposer,
+			sync_oracle: service.network(),
+			inherent_data_providers: inherent_data_providers.clone(),
+			force_authoring: force_authoring,
+			time_source: babe_link,
+		};
+
+		let babe = start_babe(babe_config)?;
+		let select = babe.select(service.on_exit()).then(|_| Ok(()));
+
+		// the BABE authoring task is considered infallible, i.e. if it
+		// fails we take down the service with it.
+		service.spawn_essential_task(select);
+	}
+
+	let grandpa_config = grandpa::Config {
+		// FIXME #1578 make this available through chainspec
+		gossip_duration: Duration::from_millis(333),
+		justification_period: 4096,
+		name: Some(name),
+		keystore: Some(service.keystore()),
+	};
+
+	match (is_authority, disable_grandpa) {
+		(false, false) => {
+			// start the lightweight GRANDPA observer
+			service.spawn_task(Box::new(grandpa::run_grandpa_observer(
+				grandpa_config,
+				link_half,
+				service.network(),
+				service.on_exit(),
+			)?));
+		},
+		(true, false) => {
+			// start the full GRANDPA voter
+			let voter_config = grandpa::GrandpaParams {
+				config: grandpa_config,
+				link: link_half,
+				network: service.network(),
+				inherent_data_providers: inherent_data_providers.clone(),
+				on_exit: service.on_exit(),
+				telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
+			};
+
+			// the GRANDPA voter task is considered infallible, i.e.
+			// if it fails we take down the service with it.
+			service.spawn_essential_task(grandpa::run_grandpa_voter(voter_config)?);
+		},
+		(_, true) => {
+			grandpa::setup_disabled_grandpa(
+				service.client(),
+				&inherent_data_providers,
+				service.network(),
+			)?;
+		},
+	}
+
+	Ok(service)
+}
+
+/// Builds a new service for a light client.
+pub fn new_light<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+	let inherent_data_providers = InherentDataProviders::new();
+
+	ServiceBuilder::new_light::<Block, RuntimeApi, Executor>(config)?
+		.with_select_chain(|_config, backend| {
+			Ok(LongestChain::new(backend.clone()))
+		})?
+		.with_transaction_pool(|config, client|
+			Ok(TransactionPool::new(config, transaction_pool::ChainApi::new(client)))
+		)?
+		.with_import_queue_and_fprb(|_config, client, backend, _select_chain, transaction_pool| {
+			let fetch_checker = backend.blockchain().fetcher()
+				.upgrade()
+				.map(|fetcher| fetcher.checker().clone())
+				.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
+			let block_import = grandpa::light_block_import::<_, _, _, RuntimeApi, _>(
+				client.clone(), backend, Arc::new(fetch_checker), client.clone()
+			)?;
+
+			let finality_proof_import = block_import.clone();
+			let finality_proof_request_builder =
+				finality_proof_import.create_finality_proof_request_builder();
+
+			// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
+			let (import_queue, ..) = import_queue(
+				Config::get_or_compute(&*client)?,
+				block_import,
+				None,
+				Some(Box::new(finality_proof_import)),
+				client.clone(),
+				client,
+				inherent_data_providers.clone(),
+				Some(transaction_pool)
+			)?;
+
+			Ok((import_queue, finality_proof_request_builder))
+		})?
+		.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()
+}
diff --git a/projects/lesson-4/Cargo.lock b/projects/lesson-4/Cargo.lock
new file mode 100644
index 0000000..d0017e2
--- /dev/null
+++ b/projects/lesson-4/Cargo.lock
@@ -0,0 +1,5518 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "adler32"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "aes-ctr"
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+"checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
+"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+"checksum wincolor 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "96f5016b18804d24db43cebf3c77269e7569b8954a8464501c216cc5e070eaa9"
+"checksum ws 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8a6f5bb86663ff4d1639408410f50bf6050367a8525d644d49a6894cd618a631"
+"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+"checksum x25519-dalek 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7ee1585dc1484373cbc1cee7aafda26634665cf449436fd6e24bfd1fad230538"
+"checksum xdg 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d089681aa106a86fade1b0128fb5daf07d5867a509ab036d99988dec80429a57"
+"checksum yamux 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "01bd67889938c48f0049fc60a77341039e6c3eaf16cb7693e6ead7c0ba701295"
+"checksum zeroize 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "45af6a010d13e4cf5b54c94ba5a2b2eba5596b9e46bf5875612d332a1f2b3f86"
+"checksum zeroize_derive 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "080616bd0e31f36095288bb0acdf1f78ef02c2fa15527d7e993f2a6c7591643e"
diff --git a/projects/lesson-4/Cargo.toml b/projects/lesson-4/Cargo.toml
new file mode 100644
index 0000000..551c9ef
--- /dev/null
+++ b/projects/lesson-4/Cargo.toml
@@ -0,0 +1,103 @@
+[package]
+authors = ['Bryan Chen']
+build = 'build.rs'
+edition = '2018'
+name = 'substrate-kitties'
+version = '2.0.0'
+
+[build-dependencies]
+vergen = '3'
+
+[workspace]
+members = ['runtime']
+
+[dependencies]
+derive_more = '0.14.0'
+exit-future = '0.1'
+futures = '0.1'
+log = '0.4'
+parking_lot = '0.9.0'
+tokio = '0.1'
+trie-root = '0.15.2'
+
+[dependencies.babe]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.basic-authorship]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-basic-authorship'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.ctrlc]
+features = ['termination']
+version = '3.0'
+
+[dependencies.grandpa]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.inherents]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-inherents'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.network]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-network'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-kitties-runtime]
+path = 'runtime'
+
+[dependencies.primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sr-io]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-cli]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-client]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-executor]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-service]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.transaction-pool]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-transaction-pool'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[[bin]]
+name = 'substrate-kitties'
+path = 'src/main.rs'
+[profile.release]
+panic = 'unwind'
diff --git a/projects/lesson-4/LICENSE b/projects/lesson-4/LICENSE
new file mode 100644
index 0000000..cf1ab25
--- /dev/null
+++ b/projects/lesson-4/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>
diff --git a/projects/lesson-4/README.md b/projects/lesson-4/README.md
new file mode 100644
index 0000000..5a59652
--- /dev/null
+++ b/projects/lesson-4/README.md
@@ -0,0 +1,70 @@
+# Substrate Node Template
+
+A new SRML-based Substrate node, ready for hacking.
+
+## Build
+
+Install Rust:
+
+```bash
+curl https://sh.rustup.rs -sSf | sh
+```
+
+Install required tools:
+
+```bash
+./scripts/init.sh
+```
+
+Build Wasm and native code:
+
+```bash
+cargo build
+```
+
+## Run
+
+### Single node development chain
+
+You can start a development chain with:
+
+```bash
+cargo run -- --dev
+```
+
+Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+
+### Multi-node local testnet
+
+If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
+
+Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
+
+You'll need two terminal windows open.
+
+We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
+
+```bash
+cargo run -- \
+  --base-path /tmp/alice \
+  --chain=local \
+  --alice \
+  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
+
+```bash
+cargo run -- \
+  --base-path /tmp/bob \
+  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
+  --chain=local \
+  --bob \
+  --port 30334 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
diff --git a/projects/lesson-4/build.rs b/projects/lesson-4/build.rs
new file mode 100644
index 0000000..bab46f5
--- /dev/null
+++ b/projects/lesson-4/build.rs
@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}
diff --git a/projects/lesson-4/runtime/Cargo.toml b/projects/lesson-4/runtime/Cargo.toml
new file mode 100644
index 0000000..81ad433
--- /dev/null
+++ b/projects/lesson-4/runtime/Cargo.toml
@@ -0,0 +1,155 @@
+[features]
+default = ['std']
+no_std = []
+std = [
+    'codec/std',
+    'client/std',
+    'rstd/std',
+    'runtime-io/std',
+    'support/std',
+    'balances/std',
+    'babe/std',
+    'babe-primitives/std',
+    'executive/std',
+    'indices/std',
+    'grandpa/std',
+    'primitives/std',
+    'sr-primitives/std',
+    'system/std',
+    'timestamp/std',
+    'sudo/std',
+    'version/std',
+    'serde',
+    'safe-mix/std',
+    'offchain-primitives/std',
+    'substrate-session/std',
+]
+[build-dependencies.wasm-builder-runner]
+package = 'substrate-wasm-builder-runner'
+version = '1.0.2'
+
+[package]
+authors = ['Bryan Chen']
+edition = '2018'
+name = 'substrate-kitties-runtime'
+version = '2.0.0'
+[dependencies.babe]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.balances]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-balances'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.client]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-client'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.executive]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-executive'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.indices]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-indices'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.offchain-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-offchain-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.rstd]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-std'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.runtime-io]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-io'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.safe-mix]
+default-features = false
+version = '1.0'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0'
+
+[dependencies.sr-primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sudo]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-sudo'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.support]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-support'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.system]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-system'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.timestamp]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-timestamp'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.version]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-version'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
diff --git a/projects/lesson-4/runtime/build.rs b/projects/lesson-4/runtime/build.rs
new file mode 100644
index 0000000..1ed109d
--- /dev/null
+++ b/projects/lesson-4/runtime/build.rs
@@ -0,0 +1,27 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.5"),
+		// This instructs LLD to export __heap_base as a global variable, which is used by the
+		// external memory allocator.
+		"-Clink-arg=--export=__heap_base",
+	);
+}
diff --git a/projects/lesson-4/runtime/src/kitties.rs b/projects/lesson-4/runtime/src/kitties.rs
new file mode 100644
index 0000000..6f97fd1
--- /dev/null
+++ b/projects/lesson-4/runtime/src/kitties.rs
@@ -0,0 +1,126 @@
+use support::{decl_module, decl_storage, ensure, StorageValue, StorageMap, dispatch::Result, Parameter};
+use sr_primitives::traits::{SimpleArithmetic, Bounded};
+use codec::{Encode, Decode};
+use runtime_io::blake2_128;
+use system::ensure_signed;
+use rstd::result;
+
+pub trait Trait: system::Trait {
+	type KittyIndex: Parameter + SimpleArithmetic + Bounded + Default + Copy;
+}
+
+#[derive(Encode, Decode)]
+pub struct Kitty(pub [u8; 16]);
+
+decl_storage! {
+	trait Store for Module<T: Trait> as Kitties {
+		/// Stores all the kitties, key is the kitty id / index
+		pub Kitties get(kitty): map T::KittyIndex => Option<Kitty>;
+		/// Stores the total number of kitties. i.e. the next kitty index
+		pub KittiesCount get(kitties_count): T::KittyIndex;
+
+		/// Get kitty ID by account ID and user kitty index
+		pub OwnedKitties get(owned_kitties): map (T::AccountId, T::KittyIndex) => T::KittyIndex;
+		/// Get number of kitties by account ID
+		pub OwnedKittiesCount get(owned_kitties_count): map T::AccountId => T::KittyIndex;
+	}
+}
+
+decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		/// Create a new kitty
+		pub fn create(origin) {
+			let sender = ensure_signed(origin)?;
+
+			// 作业：重构create方法，避免重复代码
+
+			let kitty_id = Self::kitties_count();
+			if kitty_id == T::KittyIndex::max_value() {
+				return Err("Kitties count overflow");
+			}
+
+			// Generate a random 128bit value
+			let payload = (<system::Module<T>>::random_seed(), &sender, <system::Module<T>>::extrinsic_index(), <system::Module<T>>::block_number());
+			let dna = payload.using_encoded(blake2_128);
+
+			// Create and store kitty
+			let kitty = Kitty(dna);
+			<Kitties<T>>::insert(kitty_id, kitty);
+			<KittiesCount<T>>::put(kitty_id + 1.into());
+
+			// Store the ownership information
+			let user_kitties_id = Self::owned_kitties_count(&sender);
+			<OwnedKitties<T>>::insert((sender.clone(), user_kitties_id), kitty_id);
+			<OwnedKittiesCount<T>>::insert(sender, user_kitties_id + 1.into());
+		}
+
+		/// Breed kitties
+		pub fn breed(origin, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) {
+			let sender = ensure_signed(origin)?;
+
+			Self::do_breed(sender, kitty_id_1, kitty_id_2)?;
+		}
+	}
+}
+
+fn combine_dna(dna1: u8, dna2: u8, selector: u8) -> u8 {
+	// 作业：实现combine_dna
+	// 伪代码：
+	// selector.map_bits(|bit, index| if (bit == 1) { dna1 & (1 << index) } else { dna2 & (1 << index) })
+	// 注意 map_bits这个方法不存在。只要能达到同样效果，不局限算法
+	// 测试数据：dna1 = 0b11110000, dna2 = 0b11001100, selector = 0b10101010, 返回值 0b11100100
+	return dna1;
+}
+
+impl<T: Trait> Module<T> {
+	fn random_value(sender: &T::AccountId) -> [u8; 16] {
+		let payload = (<system::Module<T>>::random_seed(), sender, <system::Module<T>>::extrinsic_index(), <system::Module<T>>::block_number());
+		payload.using_encoded(blake2_128)
+	}
+
+	fn next_kitty_id() -> result::Result<T::KittyIndex, &'static str> {
+		let kitty_id = Self::kitties_count();
+		if kitty_id == T::KittyIndex::max_value() {
+			return Err("Kitties count overflow");
+		}
+		Ok(kitty_id)
+	}
+
+	fn insert_kitty(owner: T::AccountId, kitty_id: T::KittyIndex, kitty: Kitty) {
+		// Create and store kitty
+		<Kitties<T>>::insert(kitty_id, kitty);
+		<KittiesCount<T>>::put(kitty_id + 1.into());
+
+		// Store the ownership information
+		let user_kitties_id = Self::owned_kitties_count(owner.clone());
+		<OwnedKitties<T>>::insert((owner.clone(), user_kitties_id), kitty_id);
+		<OwnedKittiesCount<T>>::insert(owner, user_kitties_id + 1.into());
+	}
+
+	fn do_breed(sender: T::AccountId, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) -> Result {
+		let kitty1 = Self::kitty(kitty_id_1);
+		let kitty2 = Self::kitty(kitty_id_2);
+
+		ensure!(kitty1.is_some(), "Invalid kitty_id_1");
+		ensure!(kitty2.is_some(), "Invalid kitty_id_2");
+		ensure!(kitty_id_1 != kitty_id_2, "Needs different parent");
+
+		let kitty_id = Self::next_kitty_id()?;
+
+		let kitty1_dna = kitty1.unwrap().0;
+		let kitty2_dna = kitty2.unwrap().0;
+
+		// Generate a random 128bit value
+		let selector = Self::random_value(&sender);
+		let mut new_dna = [0u8; 16];
+
+		// Combine parents and selector to create new kitty
+		for i in 0..kitty1_dna.len() {
+			new_dna[i] = combine_dna(kitty1_dna[i], kitty2_dna[i], selector[i]);
+		}
+
+		Self::insert_kitty(sender, kitty_id, Kitty(new_dna));
+
+		Ok(())
+	}
+}
diff --git a/projects/lesson-4/runtime/src/lib.rs b/projects/lesson-4/runtime/src/lib.rs
new file mode 100644
index 0000000..706abae
--- /dev/null
+++ b/projects/lesson-4/runtime/src/lib.rs
@@ -0,0 +1,417 @@
+//! The Substrate Node Template runtime. This can be compiled with `#[no_std]`, ready for Wasm.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
+#![recursion_limit="256"]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+use rstd::prelude::*;
+use primitives::{OpaqueMetadata, crypto::key_types};
+use sr_primitives::{
+	ApplyResult, transaction_validity::TransactionValidity, generic, create_runtime_str,
+	impl_opaque_keys, AnySignature
+};
+use sr_primitives::traits::{NumberFor, BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Verify, ConvertInto};
+use sr_primitives::weights::Weight;
+use babe::{AuthorityId as BabeId};
+use grandpa::{AuthorityId as GrandpaId, AuthorityWeight as GrandpaWeight};
+use grandpa::fg_primitives::{self, ScheduledChange};
+use client::{
+	block_builder::api::{CheckInherentsResult, InherentData, self as block_builder_api},
+	runtime_api as client_api, impl_runtime_apis
+};
+use version::RuntimeVersion;
+#[cfg(feature = "std")]
+use version::NativeVersion;
+
+// A few exports that help ease life for downstream crates.
+#[cfg(any(feature = "std", test))]
+pub use sr_primitives::BuildStorage;
+pub use timestamp::Call as TimestampCall;
+pub use balances::Call as BalancesCall;
+pub use sr_primitives::{Permill, Perbill};
+pub use support::{StorageValue, construct_runtime, parameter_types};
+
+/// An index to a block.
+pub type BlockNumber = u32;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = AnySignature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
+
+/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
+/// never know...
+pub type AccountIndex = u32;
+
+/// Balance of an account.
+pub type Balance = u128;
+
+/// Index of a transaction in the chain.
+pub type Index = u32;
+
+/// A hash of some data used by the chain.
+pub type Hash = primitives::H256;
+
+/// Digest item type.
+pub type DigestItem = generic::DigestItem<Hash>;
+
+/// Used for the module template in `./template.rs`
+mod template;
+
+/// Used for the module kitties in `./kitties.rs`
+mod kitties;
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core datastructures.
+pub mod opaque {
+	use super::*;
+
+	pub use sr_primitives::OpaqueExtrinsic as UncheckedExtrinsic;
+
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+
+	pub type SessionHandlers = (Grandpa, Babe);
+
+	impl_opaque_keys! {
+		pub struct SessionKeys {
+			#[id(key_types::GRANDPA)]
+			pub grandpa: GrandpaId,
+			#[id(key_types::BABE)]
+			pub babe: BabeId,
+		}
+	}
+}
+
+/// This runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: create_runtime_str!("substrate-kitties"),
+	impl_name: create_runtime_str!("substrate-kitties"),
+	authoring_version: 3,
+	spec_version: 4,
+	impl_version: 4,
+	apis: RUNTIME_API_VERSIONS,
+};
+
+/// Constants for Babe.
+
+/// Since BABE is probabilistic this is the average expected block time that
+/// we are targetting. Blocks will be produced at a minimum duration defined
+/// by `SLOT_DURATION`, but some slots will not be allocated to any
+/// authority and hence no block will be produced. We expect to have this
+/// block time on average following the defined slot duration and the value
+/// of `c` configured for BABE (where `1 - c` represents the probability of
+/// a slot being empty).
+/// This value is only used indirectly to define the unit constants below
+/// that are expressed in blocks. The rest of the code should use
+/// `SLOT_DURATION` instead (like the timestamp module for calculating the
+/// minimum period).
+/// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
+
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+pub const EPOCH_DURATION_IN_BLOCKS: u32 = 10 * MINUTES;
+
+// These time units are defined in number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
+pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
+
+/// The version infromation used to identify this runtime when compiled natively.
+#[cfg(feature = "std")]
+pub fn native_version() -> NativeVersion {
+	NativeVersion {
+		runtime_version: VERSION,
+		can_author_with: Default::default(),
+	}
+}
+
+parameter_types! {
+	pub const BlockHashCount: BlockNumber = 250;
+	pub const MaximumBlockWeight: Weight = 1_000_000;
+	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	pub const MaximumBlockLength: u32 = 5 * 1024 * 1024;
+	pub const Version: RuntimeVersion = VERSION;
+}
+
+impl system::Trait for Runtime {
+	/// The identifier used to distinguish between accounts.
+	type AccountId = AccountId;
+	/// The aggregated dispatch type that is available for extrinsics.
+	type Call = Call;
+	/// The lookup mechanism to get account ID from whatever is passed in dispatchers.
+	type Lookup = Indices;
+	/// The index type for storing how many extrinsics an account has signed.
+	type Index = Index;
+	/// The index type for blocks.
+	type BlockNumber = BlockNumber;
+	/// The type for hashing blocks and tries.
+	type Hash = Hash;
+	/// The hashing algorithm used.
+	type Hashing = BlakeTwo256;
+	/// The header type.
+	type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// The ubiquitous event type.
+	type Event = Event;
+	/// Update weight (to fee) multiplier per-block.
+	type WeightMultiplierUpdate = ();
+	/// The ubiquitous origin type.
+	type Origin = Origin;
+	/// Maximum number of block number to block hash mappings to keep (oldest pruned first).
+	type BlockHashCount = BlockHashCount;
+	/// Maximum weight of each block. With a default weight system of 1byte == 1weight, 4mb is ok.
+	type MaximumBlockWeight = MaximumBlockWeight;
+	/// Maximum size of all encoded transactions (in bytes) that are allowed in one block.
+	type MaximumBlockLength = MaximumBlockLength;
+	/// Portion of the block weight that is available to all normal transactions.
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = Version;
+}
+
+parameter_types! {
+	pub const EpochDuration: u64 = EPOCH_DURATION_IN_BLOCKS as u64;
+	pub const ExpectedBlockTime: u64 = MILLISECS_PER_BLOCK;
+}
+
+impl babe::Trait for Runtime {
+	type EpochDuration = EpochDuration;
+	type ExpectedBlockTime = ExpectedBlockTime;
+}
+
+impl grandpa::Trait for Runtime {
+	type Event = Event;
+}
+
+impl indices::Trait for Runtime {
+	/// The type for recording indexing into the account enumeration. If this ever overflows, there
+	/// will be problems!
+	type AccountIndex = u32;
+	/// Use the standard means of resolving an index hint from an id.
+	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
+	/// Determine whether an account is dead.
+	type IsDeadAccount = Balances;
+	/// The ubiquitous event type.
+	type Event = Event;
+}
+
+parameter_types! {
+	pub const MinimumPeriod: u64 = 1000;
+}
+
+impl timestamp::Trait for Runtime {
+	/// A timestamp: milliseconds since the unix epoch.
+	type Moment = u64;
+	type OnTimestampSet = Babe;
+	type MinimumPeriod = MinimumPeriod;
+}
+
+parameter_types! {
+	pub const ExistentialDeposit: u128 = 500;
+	pub const TransferFee: u128 = 0;
+	pub const CreationFee: u128 = 0;
+	pub const TransactionBaseFee: u128 = 0;
+	pub const TransactionByteFee: u128 = 1;
+}
+
+impl balances::Trait for Runtime {
+	/// The type for recording an account's balance.
+	type Balance = Balance;
+	/// What to do if an account's free balance gets zeroed.
+	type OnFreeBalanceZero = ();
+	/// What to do if a new account is created.
+	type OnNewAccount = Indices;
+	/// The ubiquitous event type.
+	type Event = Event;
+	type TransactionPayment = ();
+	type DustRemoval = ();
+	type TransferPayment = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type TransferFee = TransferFee;
+	type CreationFee = CreationFee;
+	type TransactionBaseFee = TransactionBaseFee;
+	type TransactionByteFee = TransactionByteFee;
+	type WeightToFee = ConvertInto;
+}
+
+impl sudo::Trait for Runtime {
+	type Event = Event;
+	type Proposal = Call;
+}
+
+/// Used for the module template in `./template.rs`
+impl template::Trait for Runtime {
+	type Event = Event;
+}
+
+impl kitties::Trait for Runtime {
+	type KittyIndex = u32;
+}
+
+construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = opaque::Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system::{Module, Call, Storage, Config, Event},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
+		Babe: babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
+		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
+		Indices: indices::{default, Config<T>},
+		Balances: balances::{default, Error},
+		Sudo: sudo,
+		// Used for the module template in `./template.rs`
+		TemplateModule: template::{Module, Call, Storage, Event<T>},
+		// Substrate Kitties module
+		Kitties: kitties::{Module, Storage, Call},
+	}
+);
+
+/// The address format for describing accounts.
+pub type Address = <Indices as StaticLookup>::Source;
+/// Block header type as expected by this runtime.
+pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+/// Block type as expected by this runtime.
+pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+/// A Block signed with a Justification
+pub type SignedBlock = generic::SignedBlock<Block>;
+/// BlockId type as expected by this runtime.
+pub type BlockId = generic::BlockId<Block>;
+/// The SignedExtension to the basic transaction logic.
+pub type SignedExtra = (
+	system::CheckVersion<Runtime>,
+	system::CheckGenesis<Runtime>,
+	system::CheckEra<Runtime>,
+	system::CheckNonce<Runtime>,
+	system::CheckWeight<Runtime>,
+	balances::TakeFees<Runtime>
+);
+/// Unchecked extrinsic type as expected by this runtime.
+pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Call, SignedExtra>;
+/// Executive: handles dispatch to the various modules.
+pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Runtime, AllModules>;
+
+impl_runtime_apis! {
+	impl client_api::Core<Block> for Runtime {
+		fn version() -> RuntimeVersion {
+			VERSION
+		}
+
+		fn execute_block(block: Block) {
+			Executive::execute_block(block)
+		}
+
+		fn initialize_block(header: &<Block as BlockT>::Header) {
+			Executive::initialize_block(header)
+		}
+	}
+
+	impl client_api::Metadata<Block> for Runtime {
+		fn metadata() -> OpaqueMetadata {
+			Runtime::metadata().into()
+		}
+	}
+
+	impl block_builder_api::BlockBuilder<Block> for Runtime {
+		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
+			Executive::apply_extrinsic(extrinsic)
+		}
+
+		fn finalize_block() -> <Block as BlockT>::Header {
+			Executive::finalize_block()
+		}
+
+		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
+			data.create_extrinsics()
+		}
+
+		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
+			data.check_extrinsics(&block)
+		}
+
+		fn random_seed() -> <Block as BlockT>::Hash {
+			System::random_seed()
+		}
+	}
+
+	impl client_api::TaggedTransactionQueue<Block> for Runtime {
+		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
+			Executive::validate_transaction(tx)
+		}
+	}
+
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
+	impl fg_primitives::GrandpaApi<Block> for Runtime {
+		fn grandpa_pending_change(digest: &DigestFor<Block>)
+			-> Option<ScheduledChange<NumberFor<Block>>>
+		{
+			Grandpa::pending_change(digest)
+		}
+
+		fn grandpa_forced_change(digest: &DigestFor<Block>)
+			-> Option<(NumberFor<Block>, ScheduledChange<NumberFor<Block>>)>
+		{
+			Grandpa::forced_change(digest)
+		}
+
+		fn grandpa_authorities() -> Vec<(GrandpaId, GrandpaWeight)> {
+			Grandpa::grandpa_authorities()
+		}
+	}
+
+	impl babe_primitives::BabeApi<Block> for Runtime {
+		fn startup_data() -> babe_primitives::BabeConfiguration {
+			// The choice of `c` parameter (where `1 - c` represents the
+			// probability of a slot being empty), is done in accordance to the
+			// slot duration and expected target block time, for safely
+			// resisting network delays of maximum two seconds.
+			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+			babe_primitives::BabeConfiguration {
+				median_required_blocks: 1000,
+				slot_duration: Babe::slot_duration(),
+				c: PRIMARY_PROBABILITY,
+			}
+		}
+
+		fn epoch() -> babe_primitives::Epoch {
+			babe_primitives::Epoch {
+				start_slot: Babe::epoch_start_slot(),
+				authorities: Babe::authorities(),
+				epoch_index: Babe::epoch_index(),
+				randomness: Babe::randomness(),
+				duration: EpochDuration::get(),
+				secondary_slots: Babe::secondary_slots().0,
+			}
+		}
+	}
+
+	impl substrate_session::SessionKeys<Block> for Runtime {
+		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
+			let seed = seed.as_ref().map(|s| rstd::str::from_utf8(&s).expect("Seed is an utf8 string"));
+			opaque::SessionKeys::generate(seed)
+		}
+	}
+}
diff --git a/projects/lesson-4/runtime/src/template.rs b/projects/lesson-4/runtime/src/template.rs
new file mode 100644
index 0000000..c1fa6f2
--- /dev/null
+++ b/projects/lesson-4/runtime/src/template.rs
@@ -0,0 +1,133 @@
+/// A runtime module template with necessary imports
+
+/// Feel free to remove or edit this file as needed.
+/// If you change the name of this file, make sure to update its references in runtime/src/lib.rs
+/// If you remove this file, you can remove those references
+
+
+/// For more guidance on Substrate modules, see the example module
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
+
+use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
+use system::ensure_signed;
+
+/// The module's configuration trait.
+pub trait Trait: system::Trait {
+	// TODO: Add other types and constants required configure this module.
+
+	/// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as TemplateModule {
+		// Just a dummy storage item.
+		// Here we are declaring a StorageValue, `Something` as a Option<u32>
+		// `get(something)` is the default getter which returns either the stored `u32` or `None` if nothing stored
+		Something get(something): Option<u32>;
+	}
+}
+
+// The module's dispatchable functions.
+decl_module! {
+	/// The module declaration.
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		// Initializing events
+		// this is needed only if you are using events in your module
+		fn deposit_event() = default;
+
+		// Just a dummy entry point.
+		// function that can be called by the external world as an extrinsics call
+		// takes a parameter of the type `AccountId`, stores it and emits an event
+		pub fn do_something(origin, something: u32) -> Result {
+			// TODO: You only need this if you want to check it was signed.
+			let who = ensure_signed(origin)?;
+
+			// TODO: Code to execute when something calls this.
+			// For example: the following line stores the passed in u32 in the storage
+			Something::put(something);
+
+			// here we are raising the Something event
+			Self::deposit_event(RawEvent::SomethingStored(something, who));
+			Ok(())
+		}
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where AccountId = <T as system::Trait>::AccountId {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u32` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+		SomethingStored(u32, AccountId),
+	}
+);
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, assert_ok, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type Event = ();
+	}
+	type TemplateModule = Module<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn it_works_for_default_value() {
+		with_externalities(&mut new_test_ext(), || {
+			// Just a dummy test for the dummy funtion `do_something`
+			// calling the `do_something` function with a value 42
+			assert_ok!(TemplateModule::do_something(Origin::signed(1), 42));
+			// asserting that the stored value is equal to what we stored
+			assert_eq!(TemplateModule::something(), Some(42));
+		});
+	}
+}
diff --git a/projects/lesson-4/scripts/init.sh b/projects/lesson-4/scripts/init.sh
new file mode 100644
index 0000000..cf5ecf9
--- /dev/null
+++ b/projects/lesson-4/scripts/init.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initializing WASM build environment"
+
+if [ -z $CI_PROJECT_NAME ] ; then
+   rustup update nightly
+   rustup update stable
+fi
+
+rustup target add wasm32-unknown-unknown --toolchain nightly
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
diff --git a/projects/lesson-4/scripts/restart.sh b/projects/lesson-4/scripts/restart.sh
new file mode 100644
index 0000000..42e69dc
--- /dev/null
+++ b/projects/lesson-4/scripts/restart.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+SKIP_WASM_BUILD= cargo check
+WASM_BUILD_TYPE=release cargo run -- purge-chain --dev -y
+WASM_BUILD_TYPE=release cargo run -- --dev
\ No newline at end of file
diff --git a/projects/lesson-4/src/chain_spec.rs b/projects/lesson-4/src/chain_spec.rs
new file mode 100644
index 0000000..a4ef17a
--- /dev/null
+++ b/projects/lesson-4/src/chain_spec.rs
@@ -0,0 +1,143 @@
+use primitives::{Pair, Public};
+use substrate_kitties_runtime::{
+	AccountId, BabeConfig, BalancesConfig, GenesisConfig, GrandpaConfig,
+	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, 
+};
+use babe_primitives::{AuthorityId as BabeId};
+use grandpa_primitives::{AuthorityId as GrandpaId};
+use substrate_service;
+
+// Note this is the URL for the telemetry server
+//const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+
+/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
+pub type ChainSpec = substrate_service::ChainSpec<GenesisConfig>;
+
+/// The chain specification option. This is expected to come in from the CLI and
+/// is little more than one of a number of alternatives which can easily be converted
+/// from a string (`--chain=...`) into a `ChainSpec`.
+#[derive(Clone, Debug)]
+pub enum Alternative {
+	/// Whatever the current runtime is, with just Alice as an auth.
+	Development,
+	/// Whatever the current runtime is, with simple Alice/Bob auths.
+	LocalTestnet,
+}
+
+/// Helper function to generate a crypto pair from seed
+pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
+	TPublic::Pair::from_string(&format!("//{}", seed), None)
+		.expect("static values are valid; qed")
+		.public()
+}
+
+/// Helper function to generate stash, controller and session key from seed
+pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId, GrandpaId, BabeId) {
+	(
+		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
+		get_from_seed::<AccountId>(seed),
+		get_from_seed::<GrandpaId>(seed),
+		get_from_seed::<BabeId>(seed),
+	)
+}
+
+impl Alternative {
+	/// Get an actual chain config from one of the alternatives.
+	pub(crate) fn load(self) -> Result<ChainSpec, String> {
+		Ok(match self {
+			Alternative::Development => ChainSpec::from_genesis(
+				"Development",
+				"dev",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+				],
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+			Alternative::LocalTestnet => ChainSpec::from_genesis(
+				"Local Testnet",
+				"local_testnet",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+					get_authority_keys_from_seed("Bob"),
+				], 
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+		})
+	}
+
+	pub(crate) fn from(s: &str) -> Option<Self> {
+		match s {
+			"dev" => Some(Alternative::Development),
+			"" | "local" => Some(Alternative::LocalTestnet),
+			_ => None,
+		}
+	}
+}
+
+fn testnet_genesis(initial_authorities: Vec<(AccountId, AccountId, GrandpaId, BabeId)>,
+	root_key: AccountId, 
+	endowed_accounts: Vec<AccountId>,
+	_enable_println: bool) -> GenesisConfig {
+	GenesisConfig {
+		system: Some(SystemConfig {
+			code: WASM_BINARY.to_vec(),
+			changes_trie_config: Default::default(),
+		}),
+		indices: Some(IndicesConfig {
+			ids: endowed_accounts.clone(),
+		}),
+		balances: Some(BalancesConfig {
+			balances: endowed_accounts.iter().cloned().map(|k|(k, 1 << 60)).collect(),
+			vesting: vec![],
+		}),
+		sudo: Some(SudoConfig {
+			key: root_key,
+		}),
+		babe: Some(BabeConfig {
+			authorities: initial_authorities.iter().map(|x| (x.3.clone(), 1)).collect(),
+		}),
+		grandpa: Some(GrandpaConfig {
+			authorities: initial_authorities.iter().map(|x| (x.2.clone(), 1)).collect(),
+		}),
+	}
+}
diff --git a/projects/lesson-4/src/cli.rs b/projects/lesson-4/src/cli.rs
new file mode 100644
index 0000000..f6edbb2
--- /dev/null
+++ b/projects/lesson-4/src/cli.rs
@@ -0,0 +1,112 @@
+use crate::service;
+use futures::{future, Future, sync::oneshot};
+use std::cell::RefCell;
+use tokio::runtime::Runtime;
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+use substrate_cli::{informant, parse_and_prepare, ParseAndPrepare, NoCustom};
+use substrate_service::{AbstractService, Roles as ServiceRoles};
+use crate::chain_spec;
+use log::info;
+
+/// Parse command line arguments into service configuration.
+pub fn run<I, T, E>(args: I, exit: E, version: VersionInfo) -> error::Result<()> where
+	I: IntoIterator<Item = T>,
+	T: Into<std::ffi::OsString> + Clone,
+	E: IntoExit,
+{
+	match parse_and_prepare::<NoCustom, NoCustom, _>(&version, "substrate-node", args) {
+		ParseAndPrepare::Run(cmd) => cmd.run::<(), _, _, _, _>(load_spec, exit,
+		|exit, _cli_args, _custom_args, config| {
+			info!("{}", version.name);
+			info!("  version {}", config.full_version());
+			info!("  by {}, 2017, 2018", version.author);
+			info!("Chain specification: {}", config.chain_spec.name());
+			info!("Node name: {}", config.name);
+			info!("Roles: {:?}", config.roles);
+			let runtime = Runtime::new().map_err(|e| format!("{:?}", e))?;
+			match config.roles {
+				ServiceRoles::LIGHT => run_until_exit(
+					runtime,
+				 	service::new_light(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+				_ => run_until_exit(
+					runtime,
+					service::new_full(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+			}.map_err(|e| format!("{:?}", e))
+		}),
+		ParseAndPrepare::BuildSpec(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::ExportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::ImportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::PurgeChain(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::RevertChain(cmd) => cmd.run_with_builder::<(), _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec),
+		ParseAndPrepare::CustomCommand(_) => Ok(())
+	}?;
+
+	Ok(())
+}
+
+fn load_spec(id: &str) -> Result<Option<chain_spec::ChainSpec>, String> {
+	Ok(match chain_spec::Alternative::from(id) {
+		Some(spec) => Some(spec.load()?),
+		None => None,
+	})
+}
+
+fn run_until_exit<T, E>(
+	mut runtime: Runtime,
+	service: T,
+	e: E,
+) -> error::Result<()>
+where
+	T: AbstractService,
+	E: IntoExit,
+{
+	let (exit_send, exit) = exit_future::signal();
+
+	let informant = informant::build(&service);
+	runtime.executor().spawn(exit.until(informant).map(|_| ()));
+
+	// we eagerly drop the service so that the internal exit future is fired,
+	// but we need to keep holding a reference to the global telemetry guard
+	let _telemetry = service.telemetry();
+
+	let service_res = {
+		let exit = e.into_exit().map_err(|_| error::Error::Other("Exit future failed.".into()));
+		let service = service.map_err(|err| error::Error::Service(err));
+		let select = service.select(exit).map(|_| ()).map_err(|(err, _)| err);
+		runtime.block_on(select)
+	};
+
+	exit_send.fire();
+
+	// TODO [andre]: timeout this future #1318
+	let _ = runtime.shutdown_on_idle().wait();
+
+	service_res
+}
+
+// handles ctrl-c
+pub struct Exit;
+impl IntoExit for Exit {
+	type Exit = future::MapErr<oneshot::Receiver<()>, fn(oneshot::Canceled) -> ()>;
+	fn into_exit(self) -> Self::Exit {
+		// can't use signal directly here because CtrlC takes only `Fn`.
+		let (exit_send, exit) = oneshot::channel();
+
+		let exit_send_cell = RefCell::new(Some(exit_send));
+		ctrlc::set_handler(move || {
+			let exit_send = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take();
+			if let Some(exit_send) = exit_send {
+				exit_send.send(()).expect("Error sending exit notification");
+			}
+		}).expect("Error setting Ctrl-C handler");
+
+		exit.map_err(drop)
+	}
+}
diff --git a/projects/lesson-4/src/main.rs b/projects/lesson-4/src/main.rs
new file mode 100644
index 0000000..c7a227a
--- /dev/null
+++ b/projects/lesson-4/src/main.rs
@@ -0,0 +1,28 @@
+//! Substrate Node Template CLI library.
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+mod chain_spec;
+#[macro_use]
+mod service;
+mod cli;
+
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+
+fn main() {
+	let version = VersionInfo {
+		name: "Substrate Node",
+		commit: env!("VERGEN_SHA_SHORT"),
+		version: env!("CARGO_PKG_VERSION"),
+		executable_name: "substrate-kitties",
+		author: "Bryan Chen",
+		description: "substrate-kitties",
+		support_url: "support.anonymous.an",
+	};
+
+	if let Err(e) = cli::run(::std::env::args(), cli::Exit, version) {
+		eprintln!("Fatal error: {}\n\n{:?}", e, e);
+		std::process::exit(1)
+	}
+}
diff --git a/projects/lesson-4/src/service.rs b/projects/lesson-4/src/service.rs
new file mode 100644
index 0000000..242cd9d
--- /dev/null
+++ b/projects/lesson-4/src/service.rs
@@ -0,0 +1,232 @@
+//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.
+
+use std::sync::Arc;
+use std::time::Duration;
+use substrate_client::LongestChain;
+use babe::{import_queue, start_babe, Config};
+use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
+use futures::prelude::*;
+use substrate_kitties_runtime::{self, GenesisConfig, opaque::Block, RuntimeApi};
+use substrate_service::{error::{Error as ServiceError}, AbstractService, Configuration, ServiceBuilder};
+use transaction_pool::{self, txpool::{Pool as TransactionPool}};
+use inherents::InherentDataProviders;
+use network::construct_simple_protocol;
+use substrate_executor::native_executor_instance;
+pub use substrate_executor::NativeExecutor;
+
+// Our native executor instance.
+native_executor_instance!(
+	pub Executor,
+	substrate_kitties_runtime::api::dispatch,
+	substrate_kitties_runtime::native_version
+);
+
+construct_simple_protocol! {
+	/// Demo protocol attachment for substrate.
+	pub struct NodeProtocol where Block = Block { }
+}
+
+/// Starts a `ServiceBuilder` for a full service.
+///
+/// Use this macro if you don't actually need the full service, but just the builder in order to
+/// be able to perform chain operations.
+macro_rules! new_full_start {
+	($config:expr) => {{
+		let mut import_setup = None;
+		let inherent_data_providers = inherents::InherentDataProviders::new();
+		let mut tasks_to_spawn = None;
+
+		let builder = substrate_service::ServiceBuilder::new_full::<
+			substrate_kitties_runtime::opaque::Block, substrate_kitties_runtime::RuntimeApi, crate::service::Executor
+		>($config)?
+			.with_select_chain(|_config, backend| {
+				Ok(substrate_client::LongestChain::new(backend.clone()))
+			})?
+			.with_transaction_pool(|config, client|
+				Ok(transaction_pool::txpool::Pool::new(config, transaction_pool::ChainApi::new(client)))
+			)?
+			.with_import_queue(|_config, client, mut select_chain, transaction_pool| {
+				let select_chain = select_chain.take()
+					.ok_or_else(|| substrate_service::Error::SelectChainRequired)?;
+				let (block_import, link_half) =
+					grandpa::block_import::<_, _, _, substrate_kitties_runtime::RuntimeApi, _, _>(
+						client.clone(), client.clone(), select_chain
+					)?;
+				let justification_import = block_import.clone();
+
+				let (import_queue, babe_link, babe_block_import, pruning_task) = babe::import_queue(
+					babe::Config::get_or_compute(&*client)?,
+					block_import,
+					Some(Box::new(justification_import)),
+					None,
+					client.clone(),
+					client,
+					inherent_data_providers.clone(),
+					Some(transaction_pool)
+				)?;
+
+				import_setup = Some((babe_block_import.clone(), link_half, babe_link));
+				tasks_to_spawn = Some(vec![Box::new(pruning_task)]);
+
+				Ok(import_queue)
+			})?;
+
+		(builder, import_setup, inherent_data_providers, tasks_to_spawn)
+	}}
+}
+
+/// Builds a new service for a full client.
+pub fn new_full<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+
+	let is_authority = config.roles.is_authority();
+	let name = config.name.clone();
+	let disable_grandpa = config.disable_grandpa;
+	let force_authoring = config.force_authoring;
+
+	let (builder, mut import_setup, inherent_data_providers, mut tasks_to_spawn) = new_full_start!(config);
+
+	let service = builder.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()?;
+
+	let (block_import, link_half, babe_link) =
+		import_setup.take()
+			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
+
+	// spawn any futures that were created in the previous setup steps
+	if let Some(tasks) = tasks_to_spawn.take() {
+		for task in tasks {
+			service.spawn_task(
+				task.select(service.on_exit())
+					.map(|_| ())
+					.map_err(|_| ())
+			);
+		}
+	}
+
+	if is_authority {
+		let proposer = basic_authorship::ProposerFactory {
+			client: service.client(),
+			transaction_pool: service.transaction_pool(),
+		};
+
+		let client = service.client();
+		let select_chain = service.select_chain()
+			.ok_or(ServiceError::SelectChainRequired)?;
+
+		let babe_config = babe::BabeParams {
+			config: Config::get_or_compute(&*client)?,
+			keystore: service.keystore(),
+			client,
+			select_chain,
+			block_import,
+			env: proposer,
+			sync_oracle: service.network(),
+			inherent_data_providers: inherent_data_providers.clone(),
+			force_authoring: force_authoring,
+			time_source: babe_link,
+		};
+
+		let babe = start_babe(babe_config)?;
+		let select = babe.select(service.on_exit()).then(|_| Ok(()));
+
+		// the BABE authoring task is considered infallible, i.e. if it
+		// fails we take down the service with it.
+		service.spawn_essential_task(select);
+	}
+
+	let grandpa_config = grandpa::Config {
+		// FIXME #1578 make this available through chainspec
+		gossip_duration: Duration::from_millis(333),
+		justification_period: 4096,
+		name: Some(name),
+		keystore: Some(service.keystore()),
+	};
+
+	match (is_authority, disable_grandpa) {
+		(false, false) => {
+			// start the lightweight GRANDPA observer
+			service.spawn_task(Box::new(grandpa::run_grandpa_observer(
+				grandpa_config,
+				link_half,
+				service.network(),
+				service.on_exit(),
+			)?));
+		},
+		(true, false) => {
+			// start the full GRANDPA voter
+			let voter_config = grandpa::GrandpaParams {
+				config: grandpa_config,
+				link: link_half,
+				network: service.network(),
+				inherent_data_providers: inherent_data_providers.clone(),
+				on_exit: service.on_exit(),
+				telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
+			};
+
+			// the GRANDPA voter task is considered infallible, i.e.
+			// if it fails we take down the service with it.
+			service.spawn_essential_task(grandpa::run_grandpa_voter(voter_config)?);
+		},
+		(_, true) => {
+			grandpa::setup_disabled_grandpa(
+				service.client(),
+				&inherent_data_providers,
+				service.network(),
+			)?;
+		},
+	}
+
+	Ok(service)
+}
+
+/// Builds a new service for a light client.
+pub fn new_light<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+	let inherent_data_providers = InherentDataProviders::new();
+
+	ServiceBuilder::new_light::<Block, RuntimeApi, Executor>(config)?
+		.with_select_chain(|_config, backend| {
+			Ok(LongestChain::new(backend.clone()))
+		})?
+		.with_transaction_pool(|config, client|
+			Ok(TransactionPool::new(config, transaction_pool::ChainApi::new(client)))
+		)?
+		.with_import_queue_and_fprb(|_config, client, backend, _select_chain, transaction_pool| {
+			let fetch_checker = backend.blockchain().fetcher()
+				.upgrade()
+				.map(|fetcher| fetcher.checker().clone())
+				.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
+			let block_import = grandpa::light_block_import::<_, _, _, RuntimeApi, _>(
+				client.clone(), backend, Arc::new(fetch_checker), client.clone()
+			)?;
+
+			let finality_proof_import = block_import.clone();
+			let finality_proof_request_builder =
+				finality_proof_import.create_finality_proof_request_builder();
+
+			// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
+			let (import_queue, ..) = import_queue(
+				Config::get_or_compute(&*client)?,
+				block_import,
+				None,
+				Some(Box::new(finality_proof_import)),
+				client.clone(),
+				client,
+				inherent_data_providers.clone(),
+				Some(transaction_pool)
+			)?;
+
+			Ok((import_queue, finality_proof_request_builder))
+		})?
+		.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()
+}
diff --git a/projects/lesson-5/Cargo.lock b/projects/lesson-5/Cargo.lock
new file mode 100644
index 0000000..d0017e2
--- /dev/null
+++ b/projects/lesson-5/Cargo.lock
@@ -0,0 +1,5518 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "adler32"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "aes-ctr"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "aes-soft 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "aesni 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ctr 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stream-cipher 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "aes-soft"
+version = "0.3.3"
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+ "block-cipher-trait 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+ "opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "stream-cipher 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "const-random 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "aio-limited"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
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+"checksum zeroize_derive 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)" = "080616bd0e31f36095288bb0acdf1f78ef02c2fa15527d7e993f2a6c7591643e"
diff --git a/projects/lesson-5/Cargo.toml b/projects/lesson-5/Cargo.toml
new file mode 100644
index 0000000..551c9ef
--- /dev/null
+++ b/projects/lesson-5/Cargo.toml
@@ -0,0 +1,103 @@
+[package]
+authors = ['Bryan Chen']
+build = 'build.rs'
+edition = '2018'
+name = 'substrate-kitties'
+version = '2.0.0'
+
+[build-dependencies]
+vergen = '3'
+
+[workspace]
+members = ['runtime']
+
+[dependencies]
+derive_more = '0.14.0'
+exit-future = '0.1'
+futures = '0.1'
+log = '0.4'
+parking_lot = '0.9.0'
+tokio = '0.1'
+trie-root = '0.15.2'
+
+[dependencies.babe]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.basic-authorship]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-basic-authorship'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.ctrlc]
+features = ['termination']
+version = '3.0'
+
+[dependencies.grandpa]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.inherents]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-inherents'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.network]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-network'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-kitties-runtime]
+path = 'runtime'
+
+[dependencies.primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sr-io]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-cli]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-client]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-executor]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-service]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.transaction-pool]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-transaction-pool'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[[bin]]
+name = 'substrate-kitties'
+path = 'src/main.rs'
+[profile.release]
+panic = 'unwind'
diff --git a/projects/lesson-5/LICENSE b/projects/lesson-5/LICENSE
new file mode 100644
index 0000000..cf1ab25
--- /dev/null
+++ b/projects/lesson-5/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>
diff --git a/projects/lesson-5/README.md b/projects/lesson-5/README.md
new file mode 100644
index 0000000..5a59652
--- /dev/null
+++ b/projects/lesson-5/README.md
@@ -0,0 +1,70 @@
+# Substrate Node Template
+
+A new SRML-based Substrate node, ready for hacking.
+
+## Build
+
+Install Rust:
+
+```bash
+curl https://sh.rustup.rs -sSf | sh
+```
+
+Install required tools:
+
+```bash
+./scripts/init.sh
+```
+
+Build Wasm and native code:
+
+```bash
+cargo build
+```
+
+## Run
+
+### Single node development chain
+
+You can start a development chain with:
+
+```bash
+cargo run -- --dev
+```
+
+Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+
+### Multi-node local testnet
+
+If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
+
+Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
+
+You'll need two terminal windows open.
+
+We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
+
+```bash
+cargo run -- \
+  --base-path /tmp/alice \
+  --chain=local \
+  --alice \
+  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
+
+```bash
+cargo run -- \
+  --base-path /tmp/bob \
+  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
+  --chain=local \
+  --bob \
+  --port 30334 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
diff --git a/projects/lesson-5/build.rs b/projects/lesson-5/build.rs
new file mode 100644
index 0000000..bab46f5
--- /dev/null
+++ b/projects/lesson-5/build.rs
@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}
diff --git a/projects/lesson-5/runtime/Cargo.toml b/projects/lesson-5/runtime/Cargo.toml
new file mode 100644
index 0000000..81ad433
--- /dev/null
+++ b/projects/lesson-5/runtime/Cargo.toml
@@ -0,0 +1,155 @@
+[features]
+default = ['std']
+no_std = []
+std = [
+    'codec/std',
+    'client/std',
+    'rstd/std',
+    'runtime-io/std',
+    'support/std',
+    'balances/std',
+    'babe/std',
+    'babe-primitives/std',
+    'executive/std',
+    'indices/std',
+    'grandpa/std',
+    'primitives/std',
+    'sr-primitives/std',
+    'system/std',
+    'timestamp/std',
+    'sudo/std',
+    'version/std',
+    'serde',
+    'safe-mix/std',
+    'offchain-primitives/std',
+    'substrate-session/std',
+]
+[build-dependencies.wasm-builder-runner]
+package = 'substrate-wasm-builder-runner'
+version = '1.0.2'
+
+[package]
+authors = ['Bryan Chen']
+edition = '2018'
+name = 'substrate-kitties-runtime'
+version = '2.0.0'
+[dependencies.babe]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.balances]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-balances'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.client]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-client'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.executive]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-executive'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.indices]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-indices'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.offchain-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-offchain-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.rstd]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-std'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.runtime-io]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-io'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.safe-mix]
+default-features = false
+version = '1.0'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0'
+
+[dependencies.sr-primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sudo]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-sudo'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.support]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-support'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.system]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-system'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.timestamp]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-timestamp'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.version]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-version'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
diff --git a/projects/lesson-5/runtime/build.rs b/projects/lesson-5/runtime/build.rs
new file mode 100644
index 0000000..1ed109d
--- /dev/null
+++ b/projects/lesson-5/runtime/build.rs
@@ -0,0 +1,27 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.5"),
+		// This instructs LLD to export __heap_base as a global variable, which is used by the
+		// external memory allocator.
+		"-Clink-arg=--export=__heap_base",
+	);
+}
diff --git a/projects/lesson-5/runtime/src/kitties.rs b/projects/lesson-5/runtime/src/kitties.rs
new file mode 100644
index 0000000..6a7eb3c
--- /dev/null
+++ b/projects/lesson-5/runtime/src/kitties.rs
@@ -0,0 +1,351 @@
+use support::{decl_module, decl_storage, ensure, StorageValue, StorageMap, dispatch::Result, Parameter};
+use sr_primitives::traits::{SimpleArithmetic, Bounded, Member};
+use codec::{Encode, Decode};
+use runtime_io::blake2_128;
+use system::ensure_signed;
+use rstd::result;
+
+pub trait Trait: system::Trait {
+	type KittyIndex: Parameter + Member + SimpleArithmetic + Bounded + Default + Copy;
+}
+
+#[derive(Encode, Decode)]
+pub struct Kitty(pub [u8; 16]);
+
+#[cfg_attr(feature = "std", derive(Debug, PartialEq, Eq))]
+#[derive(Encode, Decode)]
+pub struct KittyLinkedItem<T: Trait> {
+	pub prev: Option<T::KittyIndex>,
+	pub next: Option<T::KittyIndex>,
+}
+
+decl_storage! {
+	trait Store for Module<T: Trait> as Kitties {
+		/// Stores all the kitties, key is the kitty id / index
+		pub Kitties get(kitty): map T::KittyIndex => Option<Kitty>;
+		/// Stores the total number of kitties. i.e. the next kitty index
+		pub KittiesCount get(kitties_count): T::KittyIndex;
+
+		pub OwnedKitties get(owned_kitties): map (T::AccountId, Option<T::KittyIndex>) => Option<KittyLinkedItem<T>>;
+	}
+}
+
+decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		/// Create a new kitty
+		pub fn create(origin) {
+			let sender = ensure_signed(origin)?;
+			let kitty_id = Self::next_kitty_id()?;
+
+			// Generate a random 128bit value
+			let dna = Self::random_value(&sender);
+
+			// Create and store kitty
+			let kitty = Kitty(dna);
+			Self::insert_kitty(&sender, kitty_id, kitty);
+		}
+
+		/// Breed kitties
+		pub fn breed(origin, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) {
+			let sender = ensure_signed(origin)?;
+
+			Self::do_breed(&sender, kitty_id_1, kitty_id_2)?;
+		}
+
+		// 作业：实现 transfer(origin, to: T::AccountId, kitty_id: T::KittyIndex)
+		// 使用 ensure! 来保证只有主人才有权限调用 transfer
+		// 使用 OwnedKitties::append 和 OwnedKitties::remove 来修改小猫的主人
+	}
+}
+
+impl<T: Trait> OwnedKitties<T> {
+	fn read_head(account: &T::AccountId) -> KittyLinkedItem<T> {
+ 		Self::read(account, None)
+ 	}
+
+	fn write_head(account: &T::AccountId, item: KittyLinkedItem<T>) {
+ 		Self::write(account, None, item);
+ 	}
+
+	fn read(account: &T::AccountId, key: Option<T::KittyIndex>) -> KittyLinkedItem<T> {
+ 		<OwnedKitties<T>>::get(&(account.clone(), key)).unwrap_or_else(|| KittyLinkedItem {
+ 			prev: None,
+ 			next: None,
+ 		})
+ 	}
+
+	fn write(account: &T::AccountId, key: Option<T::KittyIndex>, item: KittyLinkedItem<T>) {
+ 		<OwnedKitties<T>>::insert(&(account.clone(), key), item);
+ 	}
+
+	pub fn append(account: &T::AccountId, kitty_id: T::KittyIndex) {
+		let head = Self::read_head(account);
+		let new_head = KittyLinkedItem {
+ 			prev: Some(kitty_id),
+ 			next: head.next,
+ 		};
+
+		Self::write_head(account, new_head);
+
+		let prev = Self::read(account, head.prev);
+		let new_prev = KittyLinkedItem {
+ 			prev: prev.prev,
+ 			next: Some(kitty_id),
+ 		};
+		Self::write(account, head.prev, new_prev);
+
+		let item = KittyLinkedItem {
+ 			prev: head.prev,
+ 			next: None,
+ 		};
+ 		Self::write(account, Some(kitty_id), item);
+	}
+
+	pub fn remove(account: &T::AccountId, kitty_id: T::KittyIndex) {
+		if let Some(item) = <OwnedKitties<T>>::take(&(account.clone(), Some(kitty_id))) {
+			let prev = Self::read(account, item.prev);
+			let new_prev = KittyLinkedItem {
+ 				prev: prev.prev,
+ 				next: item.next,
+ 			};
+
+			Self::write(account, item.prev, new_prev);
+
+			let next = Self::read(account, item.next);
+ 			let new_next = KittyLinkedItem {
+ 				prev: item.prev,
+ 				next: next.next,
+ 			};
+
+  			Self::write(account, item.next, new_next);
+		}
+	}
+}
+
+fn combine_dna(dna1: u8, dna2: u8, selector: u8) -> u8 {
+	((selector & dna1) | (!selector & dna2))
+}
+
+impl<T: Trait> Module<T> {
+	fn random_value(sender: &T::AccountId) -> [u8; 16] {
+		let payload = (<system::Module<T>>::random_seed(), sender, <system::Module<T>>::extrinsic_index(), <system::Module<T>>::block_number());
+		payload.using_encoded(blake2_128)
+	}
+
+	fn next_kitty_id() -> result::Result<T::KittyIndex, &'static str> {
+		let kitty_id = Self::kitties_count();
+		if kitty_id == T::KittyIndex::max_value() {
+			return Err("Kitties count overflow");
+		}
+		Ok(kitty_id)
+	}
+
+	fn insert_owned_kitty(owner: &T::AccountId, kitty_id: T::KittyIndex) {
+		// 作业：调用 OwnedKitties::append 完成实现
+  	}
+
+	fn insert_kitty(owner: &T::AccountId, kitty_id: T::KittyIndex, kitty: Kitty) {
+		// Create and store kitty
+		<Kitties<T>>::insert(kitty_id, kitty);
+		<KittiesCount<T>>::put(kitty_id + 1.into());
+
+		Self::insert_owned_kitty(owner, kitty_id);
+	}
+
+	fn do_breed(sender: &T::AccountId, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) -> Result {
+		let kitty1 = Self::kitty(kitty_id_1);
+		let kitty2 = Self::kitty(kitty_id_2);
+
+		ensure!(kitty1.is_some(), "Invalid kitty_id_1");
+		ensure!(kitty2.is_some(), "Invalid kitty_id_2");
+		ensure!(kitty_id_1 != kitty_id_2, "Needs different parent");
+
+		let kitty_id = Self::next_kitty_id()?;
+
+		let kitty1_dna = kitty1.unwrap().0;
+		let kitty2_dna = kitty2.unwrap().0;
+
+		// Generate a random 128bit value
+		let selector = Self::random_value(&sender);
+		let mut new_dna = [0u8; 16];
+
+		// Combine parents and selector to create new kitty
+		for i in 0..kitty1_dna.len() {
+			new_dna[i] = combine_dna(kitty1_dna[i], kitty2_dna[i], selector[i]);
+		}
+
+		Self::insert_kitty(sender, kitty_id, Kitty(new_dna));
+
+		Ok(())
+	}
+}
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq, Debug)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type KittyIndex = u32;
+	}
+	type OwnedKittiesTest = OwnedKitties<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn owned_kitties_can_append_values() {
+		with_externalities(&mut new_test_ext(), || {
+			OwnedKittiesTest::append(&0, 1);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::append(&0, 2);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(2),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: Some(2),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::append(&0, 3);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(3),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: Some(2),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: Some(3),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem {
+ 				prev: Some(2),
+ 				next: None,
+ 			}));
+		});
+	}
+
+	#[test]
+ 	fn owned_kitties_can_remove_values() {
+ 		with_externalities(&mut new_test_ext(), || {
+			OwnedKittiesTest::append(&0, 1);
+ 			OwnedKittiesTest::append(&0, 2);
+ 			OwnedKittiesTest::append(&0, 3);
+
+			OwnedKittiesTest::remove(&0, 2);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(3),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: Some(3),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::remove(&0, 1);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(3),
+ 				next: Some(3),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::remove(&0, 3);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: None,
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+		});
+	}
+}
diff --git a/projects/lesson-5/runtime/src/lib.rs b/projects/lesson-5/runtime/src/lib.rs
new file mode 100644
index 0000000..706abae
--- /dev/null
+++ b/projects/lesson-5/runtime/src/lib.rs
@@ -0,0 +1,417 @@
+//! The Substrate Node Template runtime. This can be compiled with `#[no_std]`, ready for Wasm.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
+#![recursion_limit="256"]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+use rstd::prelude::*;
+use primitives::{OpaqueMetadata, crypto::key_types};
+use sr_primitives::{
+	ApplyResult, transaction_validity::TransactionValidity, generic, create_runtime_str,
+	impl_opaque_keys, AnySignature
+};
+use sr_primitives::traits::{NumberFor, BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Verify, ConvertInto};
+use sr_primitives::weights::Weight;
+use babe::{AuthorityId as BabeId};
+use grandpa::{AuthorityId as GrandpaId, AuthorityWeight as GrandpaWeight};
+use grandpa::fg_primitives::{self, ScheduledChange};
+use client::{
+	block_builder::api::{CheckInherentsResult, InherentData, self as block_builder_api},
+	runtime_api as client_api, impl_runtime_apis
+};
+use version::RuntimeVersion;
+#[cfg(feature = "std")]
+use version::NativeVersion;
+
+// A few exports that help ease life for downstream crates.
+#[cfg(any(feature = "std", test))]
+pub use sr_primitives::BuildStorage;
+pub use timestamp::Call as TimestampCall;
+pub use balances::Call as BalancesCall;
+pub use sr_primitives::{Permill, Perbill};
+pub use support::{StorageValue, construct_runtime, parameter_types};
+
+/// An index to a block.
+pub type BlockNumber = u32;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = AnySignature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
+
+/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
+/// never know...
+pub type AccountIndex = u32;
+
+/// Balance of an account.
+pub type Balance = u128;
+
+/// Index of a transaction in the chain.
+pub type Index = u32;
+
+/// A hash of some data used by the chain.
+pub type Hash = primitives::H256;
+
+/// Digest item type.
+pub type DigestItem = generic::DigestItem<Hash>;
+
+/// Used for the module template in `./template.rs`
+mod template;
+
+/// Used for the module kitties in `./kitties.rs`
+mod kitties;
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core datastructures.
+pub mod opaque {
+	use super::*;
+
+	pub use sr_primitives::OpaqueExtrinsic as UncheckedExtrinsic;
+
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+
+	pub type SessionHandlers = (Grandpa, Babe);
+
+	impl_opaque_keys! {
+		pub struct SessionKeys {
+			#[id(key_types::GRANDPA)]
+			pub grandpa: GrandpaId,
+			#[id(key_types::BABE)]
+			pub babe: BabeId,
+		}
+	}
+}
+
+/// This runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: create_runtime_str!("substrate-kitties"),
+	impl_name: create_runtime_str!("substrate-kitties"),
+	authoring_version: 3,
+	spec_version: 4,
+	impl_version: 4,
+	apis: RUNTIME_API_VERSIONS,
+};
+
+/// Constants for Babe.
+
+/// Since BABE is probabilistic this is the average expected block time that
+/// we are targetting. Blocks will be produced at a minimum duration defined
+/// by `SLOT_DURATION`, but some slots will not be allocated to any
+/// authority and hence no block will be produced. We expect to have this
+/// block time on average following the defined slot duration and the value
+/// of `c` configured for BABE (where `1 - c` represents the probability of
+/// a slot being empty).
+/// This value is only used indirectly to define the unit constants below
+/// that are expressed in blocks. The rest of the code should use
+/// `SLOT_DURATION` instead (like the timestamp module for calculating the
+/// minimum period).
+/// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
+
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+pub const EPOCH_DURATION_IN_BLOCKS: u32 = 10 * MINUTES;
+
+// These time units are defined in number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
+pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
+
+/// The version infromation used to identify this runtime when compiled natively.
+#[cfg(feature = "std")]
+pub fn native_version() -> NativeVersion {
+	NativeVersion {
+		runtime_version: VERSION,
+		can_author_with: Default::default(),
+	}
+}
+
+parameter_types! {
+	pub const BlockHashCount: BlockNumber = 250;
+	pub const MaximumBlockWeight: Weight = 1_000_000;
+	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	pub const MaximumBlockLength: u32 = 5 * 1024 * 1024;
+	pub const Version: RuntimeVersion = VERSION;
+}
+
+impl system::Trait for Runtime {
+	/// The identifier used to distinguish between accounts.
+	type AccountId = AccountId;
+	/// The aggregated dispatch type that is available for extrinsics.
+	type Call = Call;
+	/// The lookup mechanism to get account ID from whatever is passed in dispatchers.
+	type Lookup = Indices;
+	/// The index type for storing how many extrinsics an account has signed.
+	type Index = Index;
+	/// The index type for blocks.
+	type BlockNumber = BlockNumber;
+	/// The type for hashing blocks and tries.
+	type Hash = Hash;
+	/// The hashing algorithm used.
+	type Hashing = BlakeTwo256;
+	/// The header type.
+	type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// The ubiquitous event type.
+	type Event = Event;
+	/// Update weight (to fee) multiplier per-block.
+	type WeightMultiplierUpdate = ();
+	/// The ubiquitous origin type.
+	type Origin = Origin;
+	/// Maximum number of block number to block hash mappings to keep (oldest pruned first).
+	type BlockHashCount = BlockHashCount;
+	/// Maximum weight of each block. With a default weight system of 1byte == 1weight, 4mb is ok.
+	type MaximumBlockWeight = MaximumBlockWeight;
+	/// Maximum size of all encoded transactions (in bytes) that are allowed in one block.
+	type MaximumBlockLength = MaximumBlockLength;
+	/// Portion of the block weight that is available to all normal transactions.
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = Version;
+}
+
+parameter_types! {
+	pub const EpochDuration: u64 = EPOCH_DURATION_IN_BLOCKS as u64;
+	pub const ExpectedBlockTime: u64 = MILLISECS_PER_BLOCK;
+}
+
+impl babe::Trait for Runtime {
+	type EpochDuration = EpochDuration;
+	type ExpectedBlockTime = ExpectedBlockTime;
+}
+
+impl grandpa::Trait for Runtime {
+	type Event = Event;
+}
+
+impl indices::Trait for Runtime {
+	/// The type for recording indexing into the account enumeration. If this ever overflows, there
+	/// will be problems!
+	type AccountIndex = u32;
+	/// Use the standard means of resolving an index hint from an id.
+	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
+	/// Determine whether an account is dead.
+	type IsDeadAccount = Balances;
+	/// The ubiquitous event type.
+	type Event = Event;
+}
+
+parameter_types! {
+	pub const MinimumPeriod: u64 = 1000;
+}
+
+impl timestamp::Trait for Runtime {
+	/// A timestamp: milliseconds since the unix epoch.
+	type Moment = u64;
+	type OnTimestampSet = Babe;
+	type MinimumPeriod = MinimumPeriod;
+}
+
+parameter_types! {
+	pub const ExistentialDeposit: u128 = 500;
+	pub const TransferFee: u128 = 0;
+	pub const CreationFee: u128 = 0;
+	pub const TransactionBaseFee: u128 = 0;
+	pub const TransactionByteFee: u128 = 1;
+}
+
+impl balances::Trait for Runtime {
+	/// The type for recording an account's balance.
+	type Balance = Balance;
+	/// What to do if an account's free balance gets zeroed.
+	type OnFreeBalanceZero = ();
+	/// What to do if a new account is created.
+	type OnNewAccount = Indices;
+	/// The ubiquitous event type.
+	type Event = Event;
+	type TransactionPayment = ();
+	type DustRemoval = ();
+	type TransferPayment = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type TransferFee = TransferFee;
+	type CreationFee = CreationFee;
+	type TransactionBaseFee = TransactionBaseFee;
+	type TransactionByteFee = TransactionByteFee;
+	type WeightToFee = ConvertInto;
+}
+
+impl sudo::Trait for Runtime {
+	type Event = Event;
+	type Proposal = Call;
+}
+
+/// Used for the module template in `./template.rs`
+impl template::Trait for Runtime {
+	type Event = Event;
+}
+
+impl kitties::Trait for Runtime {
+	type KittyIndex = u32;
+}
+
+construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = opaque::Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system::{Module, Call, Storage, Config, Event},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
+		Babe: babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
+		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
+		Indices: indices::{default, Config<T>},
+		Balances: balances::{default, Error},
+		Sudo: sudo,
+		// Used for the module template in `./template.rs`
+		TemplateModule: template::{Module, Call, Storage, Event<T>},
+		// Substrate Kitties module
+		Kitties: kitties::{Module, Storage, Call},
+	}
+);
+
+/// The address format for describing accounts.
+pub type Address = <Indices as StaticLookup>::Source;
+/// Block header type as expected by this runtime.
+pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+/// Block type as expected by this runtime.
+pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+/// A Block signed with a Justification
+pub type SignedBlock = generic::SignedBlock<Block>;
+/// BlockId type as expected by this runtime.
+pub type BlockId = generic::BlockId<Block>;
+/// The SignedExtension to the basic transaction logic.
+pub type SignedExtra = (
+	system::CheckVersion<Runtime>,
+	system::CheckGenesis<Runtime>,
+	system::CheckEra<Runtime>,
+	system::CheckNonce<Runtime>,
+	system::CheckWeight<Runtime>,
+	balances::TakeFees<Runtime>
+);
+/// Unchecked extrinsic type as expected by this runtime.
+pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Call, SignedExtra>;
+/// Executive: handles dispatch to the various modules.
+pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Runtime, AllModules>;
+
+impl_runtime_apis! {
+	impl client_api::Core<Block> for Runtime {
+		fn version() -> RuntimeVersion {
+			VERSION
+		}
+
+		fn execute_block(block: Block) {
+			Executive::execute_block(block)
+		}
+
+		fn initialize_block(header: &<Block as BlockT>::Header) {
+			Executive::initialize_block(header)
+		}
+	}
+
+	impl client_api::Metadata<Block> for Runtime {
+		fn metadata() -> OpaqueMetadata {
+			Runtime::metadata().into()
+		}
+	}
+
+	impl block_builder_api::BlockBuilder<Block> for Runtime {
+		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
+			Executive::apply_extrinsic(extrinsic)
+		}
+
+		fn finalize_block() -> <Block as BlockT>::Header {
+			Executive::finalize_block()
+		}
+
+		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
+			data.create_extrinsics()
+		}
+
+		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
+			data.check_extrinsics(&block)
+		}
+
+		fn random_seed() -> <Block as BlockT>::Hash {
+			System::random_seed()
+		}
+	}
+
+	impl client_api::TaggedTransactionQueue<Block> for Runtime {
+		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
+			Executive::validate_transaction(tx)
+		}
+	}
+
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
+	impl fg_primitives::GrandpaApi<Block> for Runtime {
+		fn grandpa_pending_change(digest: &DigestFor<Block>)
+			-> Option<ScheduledChange<NumberFor<Block>>>
+		{
+			Grandpa::pending_change(digest)
+		}
+
+		fn grandpa_forced_change(digest: &DigestFor<Block>)
+			-> Option<(NumberFor<Block>, ScheduledChange<NumberFor<Block>>)>
+		{
+			Grandpa::forced_change(digest)
+		}
+
+		fn grandpa_authorities() -> Vec<(GrandpaId, GrandpaWeight)> {
+			Grandpa::grandpa_authorities()
+		}
+	}
+
+	impl babe_primitives::BabeApi<Block> for Runtime {
+		fn startup_data() -> babe_primitives::BabeConfiguration {
+			// The choice of `c` parameter (where `1 - c` represents the
+			// probability of a slot being empty), is done in accordance to the
+			// slot duration and expected target block time, for safely
+			// resisting network delays of maximum two seconds.
+			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+			babe_primitives::BabeConfiguration {
+				median_required_blocks: 1000,
+				slot_duration: Babe::slot_duration(),
+				c: PRIMARY_PROBABILITY,
+			}
+		}
+
+		fn epoch() -> babe_primitives::Epoch {
+			babe_primitives::Epoch {
+				start_slot: Babe::epoch_start_slot(),
+				authorities: Babe::authorities(),
+				epoch_index: Babe::epoch_index(),
+				randomness: Babe::randomness(),
+				duration: EpochDuration::get(),
+				secondary_slots: Babe::secondary_slots().0,
+			}
+		}
+	}
+
+	impl substrate_session::SessionKeys<Block> for Runtime {
+		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
+			let seed = seed.as_ref().map(|s| rstd::str::from_utf8(&s).expect("Seed is an utf8 string"));
+			opaque::SessionKeys::generate(seed)
+		}
+	}
+}
diff --git a/projects/lesson-5/runtime/src/template.rs b/projects/lesson-5/runtime/src/template.rs
new file mode 100644
index 0000000..c1fa6f2
--- /dev/null
+++ b/projects/lesson-5/runtime/src/template.rs
@@ -0,0 +1,133 @@
+/// A runtime module template with necessary imports
+
+/// Feel free to remove or edit this file as needed.
+/// If you change the name of this file, make sure to update its references in runtime/src/lib.rs
+/// If you remove this file, you can remove those references
+
+
+/// For more guidance on Substrate modules, see the example module
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
+
+use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
+use system::ensure_signed;
+
+/// The module's configuration trait.
+pub trait Trait: system::Trait {
+	// TODO: Add other types and constants required configure this module.
+
+	/// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as TemplateModule {
+		// Just a dummy storage item.
+		// Here we are declaring a StorageValue, `Something` as a Option<u32>
+		// `get(something)` is the default getter which returns either the stored `u32` or `None` if nothing stored
+		Something get(something): Option<u32>;
+	}
+}
+
+// The module's dispatchable functions.
+decl_module! {
+	/// The module declaration.
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		// Initializing events
+		// this is needed only if you are using events in your module
+		fn deposit_event() = default;
+
+		// Just a dummy entry point.
+		// function that can be called by the external world as an extrinsics call
+		// takes a parameter of the type `AccountId`, stores it and emits an event
+		pub fn do_something(origin, something: u32) -> Result {
+			// TODO: You only need this if you want to check it was signed.
+			let who = ensure_signed(origin)?;
+
+			// TODO: Code to execute when something calls this.
+			// For example: the following line stores the passed in u32 in the storage
+			Something::put(something);
+
+			// here we are raising the Something event
+			Self::deposit_event(RawEvent::SomethingStored(something, who));
+			Ok(())
+		}
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where AccountId = <T as system::Trait>::AccountId {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u32` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+		SomethingStored(u32, AccountId),
+	}
+);
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, assert_ok, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type Event = ();
+	}
+	type TemplateModule = Module<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn it_works_for_default_value() {
+		with_externalities(&mut new_test_ext(), || {
+			// Just a dummy test for the dummy funtion `do_something`
+			// calling the `do_something` function with a value 42
+			assert_ok!(TemplateModule::do_something(Origin::signed(1), 42));
+			// asserting that the stored value is equal to what we stored
+			assert_eq!(TemplateModule::something(), Some(42));
+		});
+	}
+}
diff --git a/projects/lesson-5/scripts/init.sh b/projects/lesson-5/scripts/init.sh
new file mode 100644
index 0000000..cf5ecf9
--- /dev/null
+++ b/projects/lesson-5/scripts/init.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initializing WASM build environment"
+
+if [ -z $CI_PROJECT_NAME ] ; then
+   rustup update nightly
+   rustup update stable
+fi
+
+rustup target add wasm32-unknown-unknown --toolchain nightly
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
diff --git a/projects/lesson-5/scripts/restart.sh b/projects/lesson-5/scripts/restart.sh
new file mode 100644
index 0000000..42e69dc
--- /dev/null
+++ b/projects/lesson-5/scripts/restart.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+SKIP_WASM_BUILD= cargo check
+WASM_BUILD_TYPE=release cargo run -- purge-chain --dev -y
+WASM_BUILD_TYPE=release cargo run -- --dev
\ No newline at end of file
diff --git a/projects/lesson-5/src/chain_spec.rs b/projects/lesson-5/src/chain_spec.rs
new file mode 100644
index 0000000..a4ef17a
--- /dev/null
+++ b/projects/lesson-5/src/chain_spec.rs
@@ -0,0 +1,143 @@
+use primitives::{Pair, Public};
+use substrate_kitties_runtime::{
+	AccountId, BabeConfig, BalancesConfig, GenesisConfig, GrandpaConfig,
+	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, 
+};
+use babe_primitives::{AuthorityId as BabeId};
+use grandpa_primitives::{AuthorityId as GrandpaId};
+use substrate_service;
+
+// Note this is the URL for the telemetry server
+//const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+
+/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
+pub type ChainSpec = substrate_service::ChainSpec<GenesisConfig>;
+
+/// The chain specification option. This is expected to come in from the CLI and
+/// is little more than one of a number of alternatives which can easily be converted
+/// from a string (`--chain=...`) into a `ChainSpec`.
+#[derive(Clone, Debug)]
+pub enum Alternative {
+	/// Whatever the current runtime is, with just Alice as an auth.
+	Development,
+	/// Whatever the current runtime is, with simple Alice/Bob auths.
+	LocalTestnet,
+}
+
+/// Helper function to generate a crypto pair from seed
+pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
+	TPublic::Pair::from_string(&format!("//{}", seed), None)
+		.expect("static values are valid; qed")
+		.public()
+}
+
+/// Helper function to generate stash, controller and session key from seed
+pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId, GrandpaId, BabeId) {
+	(
+		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
+		get_from_seed::<AccountId>(seed),
+		get_from_seed::<GrandpaId>(seed),
+		get_from_seed::<BabeId>(seed),
+	)
+}
+
+impl Alternative {
+	/// Get an actual chain config from one of the alternatives.
+	pub(crate) fn load(self) -> Result<ChainSpec, String> {
+		Ok(match self {
+			Alternative::Development => ChainSpec::from_genesis(
+				"Development",
+				"dev",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+				],
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+			Alternative::LocalTestnet => ChainSpec::from_genesis(
+				"Local Testnet",
+				"local_testnet",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+					get_authority_keys_from_seed("Bob"),
+				], 
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+		})
+	}
+
+	pub(crate) fn from(s: &str) -> Option<Self> {
+		match s {
+			"dev" => Some(Alternative::Development),
+			"" | "local" => Some(Alternative::LocalTestnet),
+			_ => None,
+		}
+	}
+}
+
+fn testnet_genesis(initial_authorities: Vec<(AccountId, AccountId, GrandpaId, BabeId)>,
+	root_key: AccountId, 
+	endowed_accounts: Vec<AccountId>,
+	_enable_println: bool) -> GenesisConfig {
+	GenesisConfig {
+		system: Some(SystemConfig {
+			code: WASM_BINARY.to_vec(),
+			changes_trie_config: Default::default(),
+		}),
+		indices: Some(IndicesConfig {
+			ids: endowed_accounts.clone(),
+		}),
+		balances: Some(BalancesConfig {
+			balances: endowed_accounts.iter().cloned().map(|k|(k, 1 << 60)).collect(),
+			vesting: vec![],
+		}),
+		sudo: Some(SudoConfig {
+			key: root_key,
+		}),
+		babe: Some(BabeConfig {
+			authorities: initial_authorities.iter().map(|x| (x.3.clone(), 1)).collect(),
+		}),
+		grandpa: Some(GrandpaConfig {
+			authorities: initial_authorities.iter().map(|x| (x.2.clone(), 1)).collect(),
+		}),
+	}
+}
diff --git a/projects/lesson-5/src/cli.rs b/projects/lesson-5/src/cli.rs
new file mode 100644
index 0000000..f6edbb2
--- /dev/null
+++ b/projects/lesson-5/src/cli.rs
@@ -0,0 +1,112 @@
+use crate::service;
+use futures::{future, Future, sync::oneshot};
+use std::cell::RefCell;
+use tokio::runtime::Runtime;
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+use substrate_cli::{informant, parse_and_prepare, ParseAndPrepare, NoCustom};
+use substrate_service::{AbstractService, Roles as ServiceRoles};
+use crate::chain_spec;
+use log::info;
+
+/// Parse command line arguments into service configuration.
+pub fn run<I, T, E>(args: I, exit: E, version: VersionInfo) -> error::Result<()> where
+	I: IntoIterator<Item = T>,
+	T: Into<std::ffi::OsString> + Clone,
+	E: IntoExit,
+{
+	match parse_and_prepare::<NoCustom, NoCustom, _>(&version, "substrate-node", args) {
+		ParseAndPrepare::Run(cmd) => cmd.run::<(), _, _, _, _>(load_spec, exit,
+		|exit, _cli_args, _custom_args, config| {
+			info!("{}", version.name);
+			info!("  version {}", config.full_version());
+			info!("  by {}, 2017, 2018", version.author);
+			info!("Chain specification: {}", config.chain_spec.name());
+			info!("Node name: {}", config.name);
+			info!("Roles: {:?}", config.roles);
+			let runtime = Runtime::new().map_err(|e| format!("{:?}", e))?;
+			match config.roles {
+				ServiceRoles::LIGHT => run_until_exit(
+					runtime,
+				 	service::new_light(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+				_ => run_until_exit(
+					runtime,
+					service::new_full(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+			}.map_err(|e| format!("{:?}", e))
+		}),
+		ParseAndPrepare::BuildSpec(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::ExportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::ImportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::PurgeChain(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::RevertChain(cmd) => cmd.run_with_builder::<(), _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec),
+		ParseAndPrepare::CustomCommand(_) => Ok(())
+	}?;
+
+	Ok(())
+}
+
+fn load_spec(id: &str) -> Result<Option<chain_spec::ChainSpec>, String> {
+	Ok(match chain_spec::Alternative::from(id) {
+		Some(spec) => Some(spec.load()?),
+		None => None,
+	})
+}
+
+fn run_until_exit<T, E>(
+	mut runtime: Runtime,
+	service: T,
+	e: E,
+) -> error::Result<()>
+where
+	T: AbstractService,
+	E: IntoExit,
+{
+	let (exit_send, exit) = exit_future::signal();
+
+	let informant = informant::build(&service);
+	runtime.executor().spawn(exit.until(informant).map(|_| ()));
+
+	// we eagerly drop the service so that the internal exit future is fired,
+	// but we need to keep holding a reference to the global telemetry guard
+	let _telemetry = service.telemetry();
+
+	let service_res = {
+		let exit = e.into_exit().map_err(|_| error::Error::Other("Exit future failed.".into()));
+		let service = service.map_err(|err| error::Error::Service(err));
+		let select = service.select(exit).map(|_| ()).map_err(|(err, _)| err);
+		runtime.block_on(select)
+	};
+
+	exit_send.fire();
+
+	// TODO [andre]: timeout this future #1318
+	let _ = runtime.shutdown_on_idle().wait();
+
+	service_res
+}
+
+// handles ctrl-c
+pub struct Exit;
+impl IntoExit for Exit {
+	type Exit = future::MapErr<oneshot::Receiver<()>, fn(oneshot::Canceled) -> ()>;
+	fn into_exit(self) -> Self::Exit {
+		// can't use signal directly here because CtrlC takes only `Fn`.
+		let (exit_send, exit) = oneshot::channel();
+
+		let exit_send_cell = RefCell::new(Some(exit_send));
+		ctrlc::set_handler(move || {
+			let exit_send = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take();
+			if let Some(exit_send) = exit_send {
+				exit_send.send(()).expect("Error sending exit notification");
+			}
+		}).expect("Error setting Ctrl-C handler");
+
+		exit.map_err(drop)
+	}
+}
diff --git a/projects/lesson-5/src/main.rs b/projects/lesson-5/src/main.rs
new file mode 100644
index 0000000..c7a227a
--- /dev/null
+++ b/projects/lesson-5/src/main.rs
@@ -0,0 +1,28 @@
+//! Substrate Node Template CLI library.
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+mod chain_spec;
+#[macro_use]
+mod service;
+mod cli;
+
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+
+fn main() {
+	let version = VersionInfo {
+		name: "Substrate Node",
+		commit: env!("VERGEN_SHA_SHORT"),
+		version: env!("CARGO_PKG_VERSION"),
+		executable_name: "substrate-kitties",
+		author: "Bryan Chen",
+		description: "substrate-kitties",
+		support_url: "support.anonymous.an",
+	};
+
+	if let Err(e) = cli::run(::std::env::args(), cli::Exit, version) {
+		eprintln!("Fatal error: {}\n\n{:?}", e, e);
+		std::process::exit(1)
+	}
+}
diff --git a/projects/lesson-5/src/service.rs b/projects/lesson-5/src/service.rs
new file mode 100644
index 0000000..242cd9d
--- /dev/null
+++ b/projects/lesson-5/src/service.rs
@@ -0,0 +1,232 @@
+//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.
+
+use std::sync::Arc;
+use std::time::Duration;
+use substrate_client::LongestChain;
+use babe::{import_queue, start_babe, Config};
+use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
+use futures::prelude::*;
+use substrate_kitties_runtime::{self, GenesisConfig, opaque::Block, RuntimeApi};
+use substrate_service::{error::{Error as ServiceError}, AbstractService, Configuration, ServiceBuilder};
+use transaction_pool::{self, txpool::{Pool as TransactionPool}};
+use inherents::InherentDataProviders;
+use network::construct_simple_protocol;
+use substrate_executor::native_executor_instance;
+pub use substrate_executor::NativeExecutor;
+
+// Our native executor instance.
+native_executor_instance!(
+	pub Executor,
+	substrate_kitties_runtime::api::dispatch,
+	substrate_kitties_runtime::native_version
+);
+
+construct_simple_protocol! {
+	/// Demo protocol attachment for substrate.
+	pub struct NodeProtocol where Block = Block { }
+}
+
+/// Starts a `ServiceBuilder` for a full service.
+///
+/// Use this macro if you don't actually need the full service, but just the builder in order to
+/// be able to perform chain operations.
+macro_rules! new_full_start {
+	($config:expr) => {{
+		let mut import_setup = None;
+		let inherent_data_providers = inherents::InherentDataProviders::new();
+		let mut tasks_to_spawn = None;
+
+		let builder = substrate_service::ServiceBuilder::new_full::<
+			substrate_kitties_runtime::opaque::Block, substrate_kitties_runtime::RuntimeApi, crate::service::Executor
+		>($config)?
+			.with_select_chain(|_config, backend| {
+				Ok(substrate_client::LongestChain::new(backend.clone()))
+			})?
+			.with_transaction_pool(|config, client|
+				Ok(transaction_pool::txpool::Pool::new(config, transaction_pool::ChainApi::new(client)))
+			)?
+			.with_import_queue(|_config, client, mut select_chain, transaction_pool| {
+				let select_chain = select_chain.take()
+					.ok_or_else(|| substrate_service::Error::SelectChainRequired)?;
+				let (block_import, link_half) =
+					grandpa::block_import::<_, _, _, substrate_kitties_runtime::RuntimeApi, _, _>(
+						client.clone(), client.clone(), select_chain
+					)?;
+				let justification_import = block_import.clone();
+
+				let (import_queue, babe_link, babe_block_import, pruning_task) = babe::import_queue(
+					babe::Config::get_or_compute(&*client)?,
+					block_import,
+					Some(Box::new(justification_import)),
+					None,
+					client.clone(),
+					client,
+					inherent_data_providers.clone(),
+					Some(transaction_pool)
+				)?;
+
+				import_setup = Some((babe_block_import.clone(), link_half, babe_link));
+				tasks_to_spawn = Some(vec![Box::new(pruning_task)]);
+
+				Ok(import_queue)
+			})?;
+
+		(builder, import_setup, inherent_data_providers, tasks_to_spawn)
+	}}
+}
+
+/// Builds a new service for a full client.
+pub fn new_full<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+
+	let is_authority = config.roles.is_authority();
+	let name = config.name.clone();
+	let disable_grandpa = config.disable_grandpa;
+	let force_authoring = config.force_authoring;
+
+	let (builder, mut import_setup, inherent_data_providers, mut tasks_to_spawn) = new_full_start!(config);
+
+	let service = builder.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()?;
+
+	let (block_import, link_half, babe_link) =
+		import_setup.take()
+			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
+
+	// spawn any futures that were created in the previous setup steps
+	if let Some(tasks) = tasks_to_spawn.take() {
+		for task in tasks {
+			service.spawn_task(
+				task.select(service.on_exit())
+					.map(|_| ())
+					.map_err(|_| ())
+			);
+		}
+	}
+
+	if is_authority {
+		let proposer = basic_authorship::ProposerFactory {
+			client: service.client(),
+			transaction_pool: service.transaction_pool(),
+		};
+
+		let client = service.client();
+		let select_chain = service.select_chain()
+			.ok_or(ServiceError::SelectChainRequired)?;
+
+		let babe_config = babe::BabeParams {
+			config: Config::get_or_compute(&*client)?,
+			keystore: service.keystore(),
+			client,
+			select_chain,
+			block_import,
+			env: proposer,
+			sync_oracle: service.network(),
+			inherent_data_providers: inherent_data_providers.clone(),
+			force_authoring: force_authoring,
+			time_source: babe_link,
+		};
+
+		let babe = start_babe(babe_config)?;
+		let select = babe.select(service.on_exit()).then(|_| Ok(()));
+
+		// the BABE authoring task is considered infallible, i.e. if it
+		// fails we take down the service with it.
+		service.spawn_essential_task(select);
+	}
+
+	let grandpa_config = grandpa::Config {
+		// FIXME #1578 make this available through chainspec
+		gossip_duration: Duration::from_millis(333),
+		justification_period: 4096,
+		name: Some(name),
+		keystore: Some(service.keystore()),
+	};
+
+	match (is_authority, disable_grandpa) {
+		(false, false) => {
+			// start the lightweight GRANDPA observer
+			service.spawn_task(Box::new(grandpa::run_grandpa_observer(
+				grandpa_config,
+				link_half,
+				service.network(),
+				service.on_exit(),
+			)?));
+		},
+		(true, false) => {
+			// start the full GRANDPA voter
+			let voter_config = grandpa::GrandpaParams {
+				config: grandpa_config,
+				link: link_half,
+				network: service.network(),
+				inherent_data_providers: inherent_data_providers.clone(),
+				on_exit: service.on_exit(),
+				telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
+			};
+
+			// the GRANDPA voter task is considered infallible, i.e.
+			// if it fails we take down the service with it.
+			service.spawn_essential_task(grandpa::run_grandpa_voter(voter_config)?);
+		},
+		(_, true) => {
+			grandpa::setup_disabled_grandpa(
+				service.client(),
+				&inherent_data_providers,
+				service.network(),
+			)?;
+		},
+	}
+
+	Ok(service)
+}
+
+/// Builds a new service for a light client.
+pub fn new_light<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+	let inherent_data_providers = InherentDataProviders::new();
+
+	ServiceBuilder::new_light::<Block, RuntimeApi, Executor>(config)?
+		.with_select_chain(|_config, backend| {
+			Ok(LongestChain::new(backend.clone()))
+		})?
+		.with_transaction_pool(|config, client|
+			Ok(TransactionPool::new(config, transaction_pool::ChainApi::new(client)))
+		)?
+		.with_import_queue_and_fprb(|_config, client, backend, _select_chain, transaction_pool| {
+			let fetch_checker = backend.blockchain().fetcher()
+				.upgrade()
+				.map(|fetcher| fetcher.checker().clone())
+				.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
+			let block_import = grandpa::light_block_import::<_, _, _, RuntimeApi, _>(
+				client.clone(), backend, Arc::new(fetch_checker), client.clone()
+			)?;
+
+			let finality_proof_import = block_import.clone();
+			let finality_proof_request_builder =
+				finality_proof_import.create_finality_proof_request_builder();
+
+			// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
+			let (import_queue, ..) = import_queue(
+				Config::get_or_compute(&*client)?,
+				block_import,
+				None,
+				Some(Box::new(finality_proof_import)),
+				client.clone(),
+				client,
+				inherent_data_providers.clone(),
+				Some(transaction_pool)
+			)?;
+
+			Ok((import_queue, finality_proof_request_builder))
+		})?
+		.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()
+}
diff --git a/projects/lesson-6/Cargo.lock b/projects/lesson-6/Cargo.lock
new file mode 100644
index 0000000..d0017e2
--- /dev/null
+++ b/projects/lesson-6/Cargo.lock
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diff --git a/projects/lesson-6/Cargo.toml b/projects/lesson-6/Cargo.toml
new file mode 100644
index 0000000..551c9ef
--- /dev/null
+++ b/projects/lesson-6/Cargo.toml
@@ -0,0 +1,103 @@
+[package]
+authors = ['Bryan Chen']
+build = 'build.rs'
+edition = '2018'
+name = 'substrate-kitties'
+version = '2.0.0'
+
+[build-dependencies]
+vergen = '3'
+
+[workspace]
+members = ['runtime']
+
+[dependencies]
+derive_more = '0.14.0'
+exit-future = '0.1'
+futures = '0.1'
+log = '0.4'
+parking_lot = '0.9.0'
+tokio = '0.1'
+trie-root = '0.15.2'
+
+[dependencies.babe]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.basic-authorship]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-basic-authorship'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.ctrlc]
+features = ['termination']
+version = '3.0'
+
+[dependencies.grandpa]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.inherents]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-inherents'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.network]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-network'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-kitties-runtime]
+path = 'runtime'
+
+[dependencies.primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sr-io]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-cli]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-client]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-executor]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-service]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.transaction-pool]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-transaction-pool'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[[bin]]
+name = 'substrate-kitties'
+path = 'src/main.rs'
+[profile.release]
+panic = 'unwind'
diff --git a/projects/lesson-6/LICENSE b/projects/lesson-6/LICENSE
new file mode 100644
index 0000000..cf1ab25
--- /dev/null
+++ b/projects/lesson-6/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>
diff --git a/projects/lesson-6/README.md b/projects/lesson-6/README.md
new file mode 100644
index 0000000..5a59652
--- /dev/null
+++ b/projects/lesson-6/README.md
@@ -0,0 +1,70 @@
+# Substrate Node Template
+
+A new SRML-based Substrate node, ready for hacking.
+
+## Build
+
+Install Rust:
+
+```bash
+curl https://sh.rustup.rs -sSf | sh
+```
+
+Install required tools:
+
+```bash
+./scripts/init.sh
+```
+
+Build Wasm and native code:
+
+```bash
+cargo build
+```
+
+## Run
+
+### Single node development chain
+
+You can start a development chain with:
+
+```bash
+cargo run -- --dev
+```
+
+Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+
+### Multi-node local testnet
+
+If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
+
+Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
+
+You'll need two terminal windows open.
+
+We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
+
+```bash
+cargo run -- \
+  --base-path /tmp/alice \
+  --chain=local \
+  --alice \
+  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
+
+```bash
+cargo run -- \
+  --base-path /tmp/bob \
+  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
+  --chain=local \
+  --bob \
+  --port 30334 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
diff --git a/projects/lesson-6/build.rs b/projects/lesson-6/build.rs
new file mode 100644
index 0000000..bab46f5
--- /dev/null
+++ b/projects/lesson-6/build.rs
@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}
diff --git a/projects/lesson-6/runtime/Cargo.toml b/projects/lesson-6/runtime/Cargo.toml
new file mode 100644
index 0000000..81ad433
--- /dev/null
+++ b/projects/lesson-6/runtime/Cargo.toml
@@ -0,0 +1,155 @@
+[features]
+default = ['std']
+no_std = []
+std = [
+    'codec/std',
+    'client/std',
+    'rstd/std',
+    'runtime-io/std',
+    'support/std',
+    'balances/std',
+    'babe/std',
+    'babe-primitives/std',
+    'executive/std',
+    'indices/std',
+    'grandpa/std',
+    'primitives/std',
+    'sr-primitives/std',
+    'system/std',
+    'timestamp/std',
+    'sudo/std',
+    'version/std',
+    'serde',
+    'safe-mix/std',
+    'offchain-primitives/std',
+    'substrate-session/std',
+]
+[build-dependencies.wasm-builder-runner]
+package = 'substrate-wasm-builder-runner'
+version = '1.0.2'
+
+[package]
+authors = ['Bryan Chen']
+edition = '2018'
+name = 'substrate-kitties-runtime'
+version = '2.0.0'
+[dependencies.babe]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.balances]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-balances'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.client]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-client'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.executive]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-executive'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.indices]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-indices'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.offchain-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-offchain-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.rstd]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-std'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.runtime-io]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-io'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.safe-mix]
+default-features = false
+version = '1.0'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0'
+
+[dependencies.sr-primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sudo]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-sudo'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.support]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-support'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.system]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-system'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.timestamp]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-timestamp'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.version]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-version'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
diff --git a/projects/lesson-6/runtime/build.rs b/projects/lesson-6/runtime/build.rs
new file mode 100644
index 0000000..1ed109d
--- /dev/null
+++ b/projects/lesson-6/runtime/build.rs
@@ -0,0 +1,27 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.5"),
+		// This instructs LLD to export __heap_base as a global variable, which is used by the
+		// external memory allocator.
+		"-Clink-arg=--export=__heap_base",
+	);
+}
diff --git a/projects/lesson-6/runtime/src/kitties.rs b/projects/lesson-6/runtime/src/kitties.rs
new file mode 100644
index 0000000..f7b42eb
--- /dev/null
+++ b/projects/lesson-6/runtime/src/kitties.rs
@@ -0,0 +1,373 @@
+use support::{
+	decl_module, decl_storage, decl_event, ensure, StorageValue, StorageMap,
+	Parameter, traits::Currency
+};
+use sr_primitives::traits::{SimpleArithmetic, Bounded, Member};
+use codec::{Encode, Decode};
+use runtime_io::blake2_128;
+use system::ensure_signed;
+use rstd::result;
+use crate::linked_item::{LinkedList, LinkedItem};
+
+pub trait Trait: system::Trait {
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+	type KittyIndex: Parameter + Member + SimpleArithmetic + Bounded + Default + Copy;
+	type Currency: Currency<Self::AccountId>;
+}
+
+type BalanceOf<T> = <<T as Trait>::Currency as Currency<<T as system::Trait>::AccountId>>::Balance;
+
+#[derive(Encode, Decode)]
+pub struct Kitty(pub [u8; 16]);
+
+type KittyLinkedItem<T> = LinkedItem<<T as Trait>::KittyIndex>;
+type OwnedKittiesList<T> = LinkedList<OwnedKitties<T>, <T as system::Trait>::AccountId, <T as Trait>::KittyIndex>;
+
+decl_storage! {
+	trait Store for Module<T: Trait> as Kitties {
+		/// Stores all the kitties, key is the kitty id / index
+		pub Kitties get(kitty): map T::KittyIndex => Option<Kitty>;
+		/// Stores the total number of kitties. i.e. the next kitty index
+		pub KittiesCount get(kitties_count): T::KittyIndex;
+
+		pub OwnedKitties get(owned_kitties): map (T::AccountId, Option<T::KittyIndex>) => Option<KittyLinkedItem<T>>;
+
+		/// Get kitty owner
+		pub KittyOwners get(kitty_owner): map T::KittyIndex => Option<T::AccountId>;
+		/// Get kitty price. None means not for sale.
+		pub KittyPrices get(kitty_price): map T::KittyIndex => Option<BalanceOf<T>>
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where
+		<T as system::Trait>::AccountId,
+		<T as Trait>::KittyIndex,
+		Balance = BalanceOf<T>,
+	{
+		/// A kitty is created. (owner, kitty_id)
+		Created(AccountId, KittyIndex),
+		/// A kitty is transferred. (from, to, kitty_id)
+		Transferred(AccountId, AccountId, KittyIndex),
+		/// A kitty is available for sale. (owner, kitty_id, price)
+		Ask(AccountId, KittyIndex, Option<Balance>),
+		/// A kitty is sold. (from, to, kitty_id, price)
+		Sold(AccountId, AccountId, KittyIndex, Balance),
+	}
+);
+
+decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		fn deposit_event() = default;
+
+		/// Create a new kitty
+		pub fn create(origin) {
+			let sender = ensure_signed(origin)?;
+			let kitty_id = Self::next_kitty_id()?;
+
+			// Generate a random 128bit value
+			let dna = Self::random_value(&sender);
+
+			// Create and store kitty
+			let kitty = Kitty(dna);
+			Self::insert_kitty(&sender, kitty_id, kitty);
+
+			Self::deposit_event(RawEvent::Created(sender, kitty_id));
+		}
+
+		/// Breed kitties
+		pub fn breed(origin, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) {
+			let sender = ensure_signed(origin)?;
+
+			let new_kitty_id = Self::do_breed(&sender, kitty_id_1, kitty_id_2)?;
+
+			Self::deposit_event(RawEvent::Created(sender, new_kitty_id));
+		}
+
+		/// Transfer a kitty to new owner
+ 		pub fn transfer(origin, to: T::AccountId, kitty_id: T::KittyIndex) {
+ 			let sender = ensure_signed(origin)?;
+
+  			ensure!(<OwnedKitties<T>>::exists(&(sender.clone(), Some(kitty_id))), "Only owner can transfer kitty");
+
+			Self::do_transfer(&sender, &to, kitty_id);
+
+			Self::deposit_event(RawEvent::Transferred(sender, to, kitty_id));
+		}
+
+		/// Set a price for a kitty for sale
+		/// None to delist the kitty
+		pub fn ask(origin, kitty_id: T::KittyIndex, price: Option<BalanceOf<T>>) {
+			let sender = ensure_signed(origin)?;
+
+			ensure!(<OwnedKitties<T>>::exists(&(sender.clone(), Some(kitty_id))), "Only owner can set price for kitty");
+
+			if let Some(ref price) = price {
+				<KittyPrices<T>>::insert(kitty_id, price);
+			} else {
+				<KittyPrices<T>>::remove(kitty_id);
+			}
+
+			Self::deposit_event(RawEvent::Ask(sender, kitty_id, price));
+		}
+
+		pub fn buy(origin, kitty_id: T::KittyIndex, price: BalanceOf<T>) {
+			let sender = ensure_signed(origin)?;
+
+			let owner = Self::kitty_owner(kitty_id);
+			ensure!(owner.is_some(), "Kitty does not exist");
+			let owner = owner.unwrap();
+
+			let kitty_price = Self::kitty_price(kitty_id);
+			ensure!(kitty_price.is_some(), "Kitty not for sale");
+
+			let kitty_price = kitty_price.unwrap();
+			ensure!(price >= kitty_price, "Price is too low");
+
+			T::Currency::transfer(&sender, &owner, kitty_price)?;
+
+			<KittyPrices<T>>::remove(kitty_id);
+
+			Self::do_transfer(&owner, &sender, kitty_id);
+
+			Self::deposit_event(RawEvent::Sold(owner, sender, kitty_id, kitty_price));
+		}
+	}
+}
+
+fn combine_dna(dna1: u8, dna2: u8, selector: u8) -> u8 {
+	((selector & dna1) | (!selector & dna2))
+}
+
+impl<T: Trait> Module<T> {
+	fn random_value(sender: &T::AccountId) -> [u8; 16] {
+		let payload = (<system::Module<T>>::random_seed(), sender, <system::Module<T>>::extrinsic_index(), <system::Module<T>>::block_number());
+		payload.using_encoded(blake2_128)
+	}
+
+	fn next_kitty_id() -> result::Result<T::KittyIndex, &'static str> {
+		let kitty_id = Self::kitties_count();
+		if kitty_id == T::KittyIndex::max_value() {
+			return Err("Kitties count overflow");
+		}
+		Ok(kitty_id)
+	}
+
+	fn insert_owned_kitty(owner: &T::AccountId, kitty_id: T::KittyIndex) {
+		<OwnedKittiesList<T>>::append(owner, kitty_id);
+	}
+
+	fn insert_kitty(owner: &T::AccountId, kitty_id: T::KittyIndex, kitty: Kitty) {
+		// Create and store kitty
+		<Kitties<T>>::insert(kitty_id, kitty);
+		<KittiesCount<T>>::put(kitty_id + 1.into());
+		<KittyOwners<T>>::insert(kitty_id, owner.clone());
+
+		Self::insert_owned_kitty(owner, kitty_id);
+	}
+
+	fn do_breed(sender: &T::AccountId, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) -> result::Result<T::KittyIndex, &'static str> {
+		let kitty1 = Self::kitty(kitty_id_1);
+		let kitty2 = Self::kitty(kitty_id_2);
+
+		ensure!(kitty1.is_some(), "Invalid kitty_id_1");
+		ensure!(kitty2.is_some(), "Invalid kitty_id_2");
+		ensure!(kitty_id_1 != kitty_id_2, "Needs different parent");
+		ensure!(Self::kitty_owner(&kitty_id_1).map(|owner| owner == *sender).unwrap_or(false), "Not onwer of kitty1");
+ 		ensure!(Self::kitty_owner(&kitty_id_2).map(|owner| owner == *sender).unwrap_or(false), "Not owner of kitty2");
+
+		let kitty_id = Self::next_kitty_id()?;
+
+		let kitty1_dna = kitty1.unwrap().0;
+		let kitty2_dna = kitty2.unwrap().0;
+
+		// Generate a random 128bit value
+		let selector = Self::random_value(&sender);
+		let mut new_dna = [0u8; 16];
+
+		// Combine parents and selector to create new kitty
+		for i in 0..kitty1_dna.len() {
+			new_dna[i] = combine_dna(kitty1_dna[i], kitty2_dna[i], selector[i]);
+		}
+
+		Self::insert_kitty(sender, kitty_id, Kitty(new_dna));
+
+		Ok(kitty_id)
+	}
+
+	fn do_transfer(from: &T::AccountId, to: &T::AccountId, kitty_id: T::KittyIndex)  {
+ 		<OwnedKittiesList<T>>::remove(&from, kitty_id);
+ 		<OwnedKittiesList<T>>::append(&to, kitty_id);
+ 		<KittyOwners<T>>::insert(kitty_id, to);
+ 	}
+}
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq, Debug)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type KittyIndex = u32;
+	}
+	type OwnedKittiesTest = OwnedKitties<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn owned_kitties_can_append_values() {
+		with_externalities(&mut new_test_ext(), || {
+			OwnedKittiesTest::append(&0, 1);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::append(&0, 2);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(2),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: Some(2),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::append(&0, 3);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(3),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: Some(2),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: Some(3),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem {
+ 				prev: Some(2),
+ 				next: None,
+ 			}));
+		});
+	}
+
+	#[test]
+ 	fn owned_kitties_can_remove_values() {
+ 		with_externalities(&mut new_test_ext(), || {
+			OwnedKittiesTest::append(&0, 1);
+ 			OwnedKittiesTest::append(&0, 2);
+ 			OwnedKittiesTest::append(&0, 3);
+
+			OwnedKittiesTest::remove(&0, 2);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(3),
+ 				next: Some(1),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: Some(3),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem {
+ 				prev: Some(1),
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::remove(&0, 1);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: Some(3),
+ 				next: Some(3),
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: None,
+ 			}));
+
+			OwnedKittiesTest::remove(&0, 3);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem {
+ 				prev: None,
+ 				next: None,
+ 			}));
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+  			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+		});
+	}
+}
diff --git a/projects/lesson-6/runtime/src/lib.rs b/projects/lesson-6/runtime/src/lib.rs
new file mode 100644
index 0000000..eaa3349
--- /dev/null
+++ b/projects/lesson-6/runtime/src/lib.rs
@@ -0,0 +1,421 @@
+//! The Substrate Node Template runtime. This can be compiled with `#[no_std]`, ready for Wasm.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
+#![recursion_limit="256"]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+use rstd::prelude::*;
+use primitives::{OpaqueMetadata, crypto::key_types};
+use sr_primitives::{
+	ApplyResult, transaction_validity::TransactionValidity, generic, create_runtime_str,
+	impl_opaque_keys, AnySignature
+};
+use sr_primitives::traits::{NumberFor, BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Verify, ConvertInto};
+use sr_primitives::weights::Weight;
+use babe::{AuthorityId as BabeId};
+use grandpa::{AuthorityId as GrandpaId, AuthorityWeight as GrandpaWeight};
+use grandpa::fg_primitives::{self, ScheduledChange};
+use client::{
+	block_builder::api::{CheckInherentsResult, InherentData, self as block_builder_api},
+	runtime_api as client_api, impl_runtime_apis
+};
+use version::RuntimeVersion;
+#[cfg(feature = "std")]
+use version::NativeVersion;
+
+// A few exports that help ease life for downstream crates.
+#[cfg(any(feature = "std", test))]
+pub use sr_primitives::BuildStorage;
+pub use timestamp::Call as TimestampCall;
+pub use balances::Call as BalancesCall;
+pub use sr_primitives::{Permill, Perbill};
+pub use support::{StorageValue, construct_runtime, parameter_types};
+
+/// An index to a block.
+pub type BlockNumber = u32;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = AnySignature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
+
+/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
+/// never know...
+pub type AccountIndex = u32;
+
+/// Balance of an account.
+pub type Balance = u128;
+
+/// Index of a transaction in the chain.
+pub type Index = u32;
+
+/// A hash of some data used by the chain.
+pub type Hash = primitives::H256;
+
+/// Digest item type.
+pub type DigestItem = generic::DigestItem<Hash>;
+
+/// Used for the module template in `./template.rs`
+mod template;
+
+/// Used for the module kitties in `./kitties.rs`
+mod kitties;
+
+mod linked_item;
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core datastructures.
+pub mod opaque {
+	use super::*;
+
+	pub use sr_primitives::OpaqueExtrinsic as UncheckedExtrinsic;
+
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+
+	pub type SessionHandlers = (Grandpa, Babe);
+
+	impl_opaque_keys! {
+		pub struct SessionKeys {
+			#[id(key_types::GRANDPA)]
+			pub grandpa: GrandpaId,
+			#[id(key_types::BABE)]
+			pub babe: BabeId,
+		}
+	}
+}
+
+/// This runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: create_runtime_str!("substrate-kitties"),
+	impl_name: create_runtime_str!("substrate-kitties"),
+	authoring_version: 3,
+	spec_version: 4,
+	impl_version: 4,
+	apis: RUNTIME_API_VERSIONS,
+};
+
+/// Constants for Babe.
+
+/// Since BABE is probabilistic this is the average expected block time that
+/// we are targetting. Blocks will be produced at a minimum duration defined
+/// by `SLOT_DURATION`, but some slots will not be allocated to any
+/// authority and hence no block will be produced. We expect to have this
+/// block time on average following the defined slot duration and the value
+/// of `c` configured for BABE (where `1 - c` represents the probability of
+/// a slot being empty).
+/// This value is only used indirectly to define the unit constants below
+/// that are expressed in blocks. The rest of the code should use
+/// `SLOT_DURATION` instead (like the timestamp module for calculating the
+/// minimum period).
+/// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
+
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+pub const EPOCH_DURATION_IN_BLOCKS: u32 = 10 * MINUTES;
+
+// These time units are defined in number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
+pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
+
+/// The version infromation used to identify this runtime when compiled natively.
+#[cfg(feature = "std")]
+pub fn native_version() -> NativeVersion {
+	NativeVersion {
+		runtime_version: VERSION,
+		can_author_with: Default::default(),
+	}
+}
+
+parameter_types! {
+	pub const BlockHashCount: BlockNumber = 250;
+	pub const MaximumBlockWeight: Weight = 1_000_000;
+	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	pub const MaximumBlockLength: u32 = 5 * 1024 * 1024;
+	pub const Version: RuntimeVersion = VERSION;
+}
+
+impl system::Trait for Runtime {
+	/// The identifier used to distinguish between accounts.
+	type AccountId = AccountId;
+	/// The aggregated dispatch type that is available for extrinsics.
+	type Call = Call;
+	/// The lookup mechanism to get account ID from whatever is passed in dispatchers.
+	type Lookup = Indices;
+	/// The index type for storing how many extrinsics an account has signed.
+	type Index = Index;
+	/// The index type for blocks.
+	type BlockNumber = BlockNumber;
+	/// The type for hashing blocks and tries.
+	type Hash = Hash;
+	/// The hashing algorithm used.
+	type Hashing = BlakeTwo256;
+	/// The header type.
+	type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// The ubiquitous event type.
+	type Event = Event;
+	/// Update weight (to fee) multiplier per-block.
+	type WeightMultiplierUpdate = ();
+	/// The ubiquitous origin type.
+	type Origin = Origin;
+	/// Maximum number of block number to block hash mappings to keep (oldest pruned first).
+	type BlockHashCount = BlockHashCount;
+	/// Maximum weight of each block. With a default weight system of 1byte == 1weight, 4mb is ok.
+	type MaximumBlockWeight = MaximumBlockWeight;
+	/// Maximum size of all encoded transactions (in bytes) that are allowed in one block.
+	type MaximumBlockLength = MaximumBlockLength;
+	/// Portion of the block weight that is available to all normal transactions.
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = Version;
+}
+
+parameter_types! {
+	pub const EpochDuration: u64 = EPOCH_DURATION_IN_BLOCKS as u64;
+	pub const ExpectedBlockTime: u64 = MILLISECS_PER_BLOCK;
+}
+
+impl babe::Trait for Runtime {
+	type EpochDuration = EpochDuration;
+	type ExpectedBlockTime = ExpectedBlockTime;
+}
+
+impl grandpa::Trait for Runtime {
+	type Event = Event;
+}
+
+impl indices::Trait for Runtime {
+	/// The type for recording indexing into the account enumeration. If this ever overflows, there
+	/// will be problems!
+	type AccountIndex = u32;
+	/// Use the standard means of resolving an index hint from an id.
+	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
+	/// Determine whether an account is dead.
+	type IsDeadAccount = Balances;
+	/// The ubiquitous event type.
+	type Event = Event;
+}
+
+parameter_types! {
+	pub const MinimumPeriod: u64 = 1000;
+}
+
+impl timestamp::Trait for Runtime {
+	/// A timestamp: milliseconds since the unix epoch.
+	type Moment = u64;
+	type OnTimestampSet = Babe;
+	type MinimumPeriod = MinimumPeriod;
+}
+
+parameter_types! {
+	pub const ExistentialDeposit: u128 = 500;
+	pub const TransferFee: u128 = 0;
+	pub const CreationFee: u128 = 0;
+	pub const TransactionBaseFee: u128 = 0;
+	pub const TransactionByteFee: u128 = 1;
+}
+
+impl balances::Trait for Runtime {
+	/// The type for recording an account's balance.
+	type Balance = Balance;
+	/// What to do if an account's free balance gets zeroed.
+	type OnFreeBalanceZero = ();
+	/// What to do if a new account is created.
+	type OnNewAccount = Indices;
+	/// The ubiquitous event type.
+	type Event = Event;
+	type TransactionPayment = ();
+	type DustRemoval = ();
+	type TransferPayment = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type TransferFee = TransferFee;
+	type CreationFee = CreationFee;
+	type TransactionBaseFee = TransactionBaseFee;
+	type TransactionByteFee = TransactionByteFee;
+	type WeightToFee = ConvertInto;
+}
+
+impl sudo::Trait for Runtime {
+	type Event = Event;
+	type Proposal = Call;
+}
+
+/// Used for the module template in `./template.rs`
+impl template::Trait for Runtime {
+	type Event = Event;
+}
+
+impl kitties::Trait for Runtime {
+	type Event = Event;
+	type KittyIndex = u32;
+	type Currency = Balances;
+}
+
+construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = opaque::Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system::{Module, Call, Storage, Config, Event},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
+		Babe: babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
+		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
+		Indices: indices::{default, Config<T>},
+		Balances: balances::{default, Error},
+		Sudo: sudo,
+		// Used for the module template in `./template.rs`
+		TemplateModule: template::{Module, Call, Storage, Event<T>},
+		// Substrate Kitties module
+		Kitties: kitties::{Module, Storage, Call, Event<T>},
+	}
+);
+
+/// The address format for describing accounts.
+pub type Address = <Indices as StaticLookup>::Source;
+/// Block header type as expected by this runtime.
+pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+/// Block type as expected by this runtime.
+pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+/// A Block signed with a Justification
+pub type SignedBlock = generic::SignedBlock<Block>;
+/// BlockId type as expected by this runtime.
+pub type BlockId = generic::BlockId<Block>;
+/// The SignedExtension to the basic transaction logic.
+pub type SignedExtra = (
+	system::CheckVersion<Runtime>,
+	system::CheckGenesis<Runtime>,
+	system::CheckEra<Runtime>,
+	system::CheckNonce<Runtime>,
+	system::CheckWeight<Runtime>,
+	balances::TakeFees<Runtime>
+);
+/// Unchecked extrinsic type as expected by this runtime.
+pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Call, SignedExtra>;
+/// Executive: handles dispatch to the various modules.
+pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Runtime, AllModules>;
+
+impl_runtime_apis! {
+	impl client_api::Core<Block> for Runtime {
+		fn version() -> RuntimeVersion {
+			VERSION
+		}
+
+		fn execute_block(block: Block) {
+			Executive::execute_block(block)
+		}
+
+		fn initialize_block(header: &<Block as BlockT>::Header) {
+			Executive::initialize_block(header)
+		}
+	}
+
+	impl client_api::Metadata<Block> for Runtime {
+		fn metadata() -> OpaqueMetadata {
+			Runtime::metadata().into()
+		}
+	}
+
+	impl block_builder_api::BlockBuilder<Block> for Runtime {
+		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
+			Executive::apply_extrinsic(extrinsic)
+		}
+
+		fn finalize_block() -> <Block as BlockT>::Header {
+			Executive::finalize_block()
+		}
+
+		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
+			data.create_extrinsics()
+		}
+
+		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
+			data.check_extrinsics(&block)
+		}
+
+		fn random_seed() -> <Block as BlockT>::Hash {
+			System::random_seed()
+		}
+	}
+
+	impl client_api::TaggedTransactionQueue<Block> for Runtime {
+		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
+			Executive::validate_transaction(tx)
+		}
+	}
+
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
+	impl fg_primitives::GrandpaApi<Block> for Runtime {
+		fn grandpa_pending_change(digest: &DigestFor<Block>)
+			-> Option<ScheduledChange<NumberFor<Block>>>
+		{
+			Grandpa::pending_change(digest)
+		}
+
+		fn grandpa_forced_change(digest: &DigestFor<Block>)
+			-> Option<(NumberFor<Block>, ScheduledChange<NumberFor<Block>>)>
+		{
+			Grandpa::forced_change(digest)
+		}
+
+		fn grandpa_authorities() -> Vec<(GrandpaId, GrandpaWeight)> {
+			Grandpa::grandpa_authorities()
+		}
+	}
+
+	impl babe_primitives::BabeApi<Block> for Runtime {
+		fn startup_data() -> babe_primitives::BabeConfiguration {
+			// The choice of `c` parameter (where `1 - c` represents the
+			// probability of a slot being empty), is done in accordance to the
+			// slot duration and expected target block time, for safely
+			// resisting network delays of maximum two seconds.
+			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+			babe_primitives::BabeConfiguration {
+				median_required_blocks: 1000,
+				slot_duration: Babe::slot_duration(),
+				c: PRIMARY_PROBABILITY,
+			}
+		}
+
+		fn epoch() -> babe_primitives::Epoch {
+			babe_primitives::Epoch {
+				start_slot: Babe::epoch_start_slot(),
+				authorities: Babe::authorities(),
+				epoch_index: Babe::epoch_index(),
+				randomness: Babe::randomness(),
+				duration: EpochDuration::get(),
+				secondary_slots: Babe::secondary_slots().0,
+			}
+		}
+	}
+
+	impl substrate_session::SessionKeys<Block> for Runtime {
+		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
+			let seed = seed.as_ref().map(|s| rstd::str::from_utf8(&s).expect("Seed is an utf8 string"));
+			opaque::SessionKeys::generate(seed)
+		}
+	}
+}
diff --git a/projects/lesson-6/runtime/src/linked_item.rs b/projects/lesson-6/runtime/src/linked_item.rs
new file mode 100644
index 0000000..2a51676
--- /dev/null
+++ b/projects/lesson-6/runtime/src/linked_item.rs
@@ -0,0 +1,45 @@
+use support::{StorageMap, Parameter};
+use sr_primitives::traits::Member;
+use codec::{Encode, Decode};
+
+#[cfg_attr(feature = "std", derive(Debug, PartialEq, Eq))]
+#[derive(Encode, Decode)]
+pub struct LinkedItem<Value> {
+	pub prev: Option<Value>,
+	pub next: Option<Value>,
+}
+
+pub struct LinkedList<Storage, Key, Value>(rstd::marker::PhantomData<(Storage, Key, Value)>);
+
+impl<Storage, Key, Value> LinkedList<Storage, Key, Value> where
+    Value: Parameter + Member + Copy,
+    Key: Parameter,
+    Storage: StorageMap<(Key, Option<Value>), LinkedItem<Value>, Query = Option<LinkedItem<Value>>>,
+{
+    fn read_head(key: &Key) -> LinkedItem<Value> {
+ 		Self::read(key, None)
+ 	}
+
+  	fn write_head(account: &Key, item: LinkedItem<Value>) {
+ 		Self::write(account, None, item);
+ 	}
+
+  	fn read(key: &Key, value: Option<Value>) -> LinkedItem<Value> {
+ 		Storage::get(&(key.clone(), value)).unwrap_or_else(|| LinkedItem {
+ 			prev: None,
+ 			next: None,
+ 		})
+ 	}
+
+  	fn write(key: &Key, value: Option<Value>, item: LinkedItem<Value>) {
+ 		Storage::insert(&(key.clone(), value), item);
+ 	}
+
+    pub fn append(key: &Key, value: Value) {
+        // 作业：实现 append
+    }
+
+    pub fn remove(key: &Key, value: Value) {
+        // 作业：实现 remove
+    }
+}
\ No newline at end of file
diff --git a/projects/lesson-6/runtime/src/template.rs b/projects/lesson-6/runtime/src/template.rs
new file mode 100644
index 0000000..c1fa6f2
--- /dev/null
+++ b/projects/lesson-6/runtime/src/template.rs
@@ -0,0 +1,133 @@
+/// A runtime module template with necessary imports
+
+/// Feel free to remove or edit this file as needed.
+/// If you change the name of this file, make sure to update its references in runtime/src/lib.rs
+/// If you remove this file, you can remove those references
+
+
+/// For more guidance on Substrate modules, see the example module
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
+
+use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
+use system::ensure_signed;
+
+/// The module's configuration trait.
+pub trait Trait: system::Trait {
+	// TODO: Add other types and constants required configure this module.
+
+	/// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as TemplateModule {
+		// Just a dummy storage item.
+		// Here we are declaring a StorageValue, `Something` as a Option<u32>
+		// `get(something)` is the default getter which returns either the stored `u32` or `None` if nothing stored
+		Something get(something): Option<u32>;
+	}
+}
+
+// The module's dispatchable functions.
+decl_module! {
+	/// The module declaration.
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		// Initializing events
+		// this is needed only if you are using events in your module
+		fn deposit_event() = default;
+
+		// Just a dummy entry point.
+		// function that can be called by the external world as an extrinsics call
+		// takes a parameter of the type `AccountId`, stores it and emits an event
+		pub fn do_something(origin, something: u32) -> Result {
+			// TODO: You only need this if you want to check it was signed.
+			let who = ensure_signed(origin)?;
+
+			// TODO: Code to execute when something calls this.
+			// For example: the following line stores the passed in u32 in the storage
+			Something::put(something);
+
+			// here we are raising the Something event
+			Self::deposit_event(RawEvent::SomethingStored(something, who));
+			Ok(())
+		}
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where AccountId = <T as system::Trait>::AccountId {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u32` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+		SomethingStored(u32, AccountId),
+	}
+);
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, assert_ok, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type Event = ();
+	}
+	type TemplateModule = Module<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn it_works_for_default_value() {
+		with_externalities(&mut new_test_ext(), || {
+			// Just a dummy test for the dummy funtion `do_something`
+			// calling the `do_something` function with a value 42
+			assert_ok!(TemplateModule::do_something(Origin::signed(1), 42));
+			// asserting that the stored value is equal to what we stored
+			assert_eq!(TemplateModule::something(), Some(42));
+		});
+	}
+}
diff --git a/projects/lesson-6/scripts/init.sh b/projects/lesson-6/scripts/init.sh
new file mode 100644
index 0000000..cf5ecf9
--- /dev/null
+++ b/projects/lesson-6/scripts/init.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initializing WASM build environment"
+
+if [ -z $CI_PROJECT_NAME ] ; then
+   rustup update nightly
+   rustup update stable
+fi
+
+rustup target add wasm32-unknown-unknown --toolchain nightly
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
diff --git a/projects/lesson-6/scripts/restart.sh b/projects/lesson-6/scripts/restart.sh
new file mode 100644
index 0000000..42e69dc
--- /dev/null
+++ b/projects/lesson-6/scripts/restart.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+SKIP_WASM_BUILD= cargo check
+WASM_BUILD_TYPE=release cargo run -- purge-chain --dev -y
+WASM_BUILD_TYPE=release cargo run -- --dev
\ No newline at end of file
diff --git a/projects/lesson-6/src/chain_spec.rs b/projects/lesson-6/src/chain_spec.rs
new file mode 100644
index 0000000..a4ef17a
--- /dev/null
+++ b/projects/lesson-6/src/chain_spec.rs
@@ -0,0 +1,143 @@
+use primitives::{Pair, Public};
+use substrate_kitties_runtime::{
+	AccountId, BabeConfig, BalancesConfig, GenesisConfig, GrandpaConfig,
+	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, 
+};
+use babe_primitives::{AuthorityId as BabeId};
+use grandpa_primitives::{AuthorityId as GrandpaId};
+use substrate_service;
+
+// Note this is the URL for the telemetry server
+//const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+
+/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
+pub type ChainSpec = substrate_service::ChainSpec<GenesisConfig>;
+
+/// The chain specification option. This is expected to come in from the CLI and
+/// is little more than one of a number of alternatives which can easily be converted
+/// from a string (`--chain=...`) into a `ChainSpec`.
+#[derive(Clone, Debug)]
+pub enum Alternative {
+	/// Whatever the current runtime is, with just Alice as an auth.
+	Development,
+	/// Whatever the current runtime is, with simple Alice/Bob auths.
+	LocalTestnet,
+}
+
+/// Helper function to generate a crypto pair from seed
+pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
+	TPublic::Pair::from_string(&format!("//{}", seed), None)
+		.expect("static values are valid; qed")
+		.public()
+}
+
+/// Helper function to generate stash, controller and session key from seed
+pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId, GrandpaId, BabeId) {
+	(
+		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
+		get_from_seed::<AccountId>(seed),
+		get_from_seed::<GrandpaId>(seed),
+		get_from_seed::<BabeId>(seed),
+	)
+}
+
+impl Alternative {
+	/// Get an actual chain config from one of the alternatives.
+	pub(crate) fn load(self) -> Result<ChainSpec, String> {
+		Ok(match self {
+			Alternative::Development => ChainSpec::from_genesis(
+				"Development",
+				"dev",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+				],
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+			Alternative::LocalTestnet => ChainSpec::from_genesis(
+				"Local Testnet",
+				"local_testnet",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+					get_authority_keys_from_seed("Bob"),
+				], 
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+		})
+	}
+
+	pub(crate) fn from(s: &str) -> Option<Self> {
+		match s {
+			"dev" => Some(Alternative::Development),
+			"" | "local" => Some(Alternative::LocalTestnet),
+			_ => None,
+		}
+	}
+}
+
+fn testnet_genesis(initial_authorities: Vec<(AccountId, AccountId, GrandpaId, BabeId)>,
+	root_key: AccountId, 
+	endowed_accounts: Vec<AccountId>,
+	_enable_println: bool) -> GenesisConfig {
+	GenesisConfig {
+		system: Some(SystemConfig {
+			code: WASM_BINARY.to_vec(),
+			changes_trie_config: Default::default(),
+		}),
+		indices: Some(IndicesConfig {
+			ids: endowed_accounts.clone(),
+		}),
+		balances: Some(BalancesConfig {
+			balances: endowed_accounts.iter().cloned().map(|k|(k, 1 << 60)).collect(),
+			vesting: vec![],
+		}),
+		sudo: Some(SudoConfig {
+			key: root_key,
+		}),
+		babe: Some(BabeConfig {
+			authorities: initial_authorities.iter().map(|x| (x.3.clone(), 1)).collect(),
+		}),
+		grandpa: Some(GrandpaConfig {
+			authorities: initial_authorities.iter().map(|x| (x.2.clone(), 1)).collect(),
+		}),
+	}
+}
diff --git a/projects/lesson-6/src/cli.rs b/projects/lesson-6/src/cli.rs
new file mode 100644
index 0000000..f6edbb2
--- /dev/null
+++ b/projects/lesson-6/src/cli.rs
@@ -0,0 +1,112 @@
+use crate::service;
+use futures::{future, Future, sync::oneshot};
+use std::cell::RefCell;
+use tokio::runtime::Runtime;
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+use substrate_cli::{informant, parse_and_prepare, ParseAndPrepare, NoCustom};
+use substrate_service::{AbstractService, Roles as ServiceRoles};
+use crate::chain_spec;
+use log::info;
+
+/// Parse command line arguments into service configuration.
+pub fn run<I, T, E>(args: I, exit: E, version: VersionInfo) -> error::Result<()> where
+	I: IntoIterator<Item = T>,
+	T: Into<std::ffi::OsString> + Clone,
+	E: IntoExit,
+{
+	match parse_and_prepare::<NoCustom, NoCustom, _>(&version, "substrate-node", args) {
+		ParseAndPrepare::Run(cmd) => cmd.run::<(), _, _, _, _>(load_spec, exit,
+		|exit, _cli_args, _custom_args, config| {
+			info!("{}", version.name);
+			info!("  version {}", config.full_version());
+			info!("  by {}, 2017, 2018", version.author);
+			info!("Chain specification: {}", config.chain_spec.name());
+			info!("Node name: {}", config.name);
+			info!("Roles: {:?}", config.roles);
+			let runtime = Runtime::new().map_err(|e| format!("{:?}", e))?;
+			match config.roles {
+				ServiceRoles::LIGHT => run_until_exit(
+					runtime,
+				 	service::new_light(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+				_ => run_until_exit(
+					runtime,
+					service::new_full(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+			}.map_err(|e| format!("{:?}", e))
+		}),
+		ParseAndPrepare::BuildSpec(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::ExportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::ImportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::PurgeChain(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::RevertChain(cmd) => cmd.run_with_builder::<(), _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec),
+		ParseAndPrepare::CustomCommand(_) => Ok(())
+	}?;
+
+	Ok(())
+}
+
+fn load_spec(id: &str) -> Result<Option<chain_spec::ChainSpec>, String> {
+	Ok(match chain_spec::Alternative::from(id) {
+		Some(spec) => Some(spec.load()?),
+		None => None,
+	})
+}
+
+fn run_until_exit<T, E>(
+	mut runtime: Runtime,
+	service: T,
+	e: E,
+) -> error::Result<()>
+where
+	T: AbstractService,
+	E: IntoExit,
+{
+	let (exit_send, exit) = exit_future::signal();
+
+	let informant = informant::build(&service);
+	runtime.executor().spawn(exit.until(informant).map(|_| ()));
+
+	// we eagerly drop the service so that the internal exit future is fired,
+	// but we need to keep holding a reference to the global telemetry guard
+	let _telemetry = service.telemetry();
+
+	let service_res = {
+		let exit = e.into_exit().map_err(|_| error::Error::Other("Exit future failed.".into()));
+		let service = service.map_err(|err| error::Error::Service(err));
+		let select = service.select(exit).map(|_| ()).map_err(|(err, _)| err);
+		runtime.block_on(select)
+	};
+
+	exit_send.fire();
+
+	// TODO [andre]: timeout this future #1318
+	let _ = runtime.shutdown_on_idle().wait();
+
+	service_res
+}
+
+// handles ctrl-c
+pub struct Exit;
+impl IntoExit for Exit {
+	type Exit = future::MapErr<oneshot::Receiver<()>, fn(oneshot::Canceled) -> ()>;
+	fn into_exit(self) -> Self::Exit {
+		// can't use signal directly here because CtrlC takes only `Fn`.
+		let (exit_send, exit) = oneshot::channel();
+
+		let exit_send_cell = RefCell::new(Some(exit_send));
+		ctrlc::set_handler(move || {
+			let exit_send = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take();
+			if let Some(exit_send) = exit_send {
+				exit_send.send(()).expect("Error sending exit notification");
+			}
+		}).expect("Error setting Ctrl-C handler");
+
+		exit.map_err(drop)
+	}
+}
diff --git a/projects/lesson-6/src/main.rs b/projects/lesson-6/src/main.rs
new file mode 100644
index 0000000..c7a227a
--- /dev/null
+++ b/projects/lesson-6/src/main.rs
@@ -0,0 +1,28 @@
+//! Substrate Node Template CLI library.
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+mod chain_spec;
+#[macro_use]
+mod service;
+mod cli;
+
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+
+fn main() {
+	let version = VersionInfo {
+		name: "Substrate Node",
+		commit: env!("VERGEN_SHA_SHORT"),
+		version: env!("CARGO_PKG_VERSION"),
+		executable_name: "substrate-kitties",
+		author: "Bryan Chen",
+		description: "substrate-kitties",
+		support_url: "support.anonymous.an",
+	};
+
+	if let Err(e) = cli::run(::std::env::args(), cli::Exit, version) {
+		eprintln!("Fatal error: {}\n\n{:?}", e, e);
+		std::process::exit(1)
+	}
+}
diff --git a/projects/lesson-6/src/service.rs b/projects/lesson-6/src/service.rs
new file mode 100644
index 0000000..242cd9d
--- /dev/null
+++ b/projects/lesson-6/src/service.rs
@@ -0,0 +1,232 @@
+//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.
+
+use std::sync::Arc;
+use std::time::Duration;
+use substrate_client::LongestChain;
+use babe::{import_queue, start_babe, Config};
+use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
+use futures::prelude::*;
+use substrate_kitties_runtime::{self, GenesisConfig, opaque::Block, RuntimeApi};
+use substrate_service::{error::{Error as ServiceError}, AbstractService, Configuration, ServiceBuilder};
+use transaction_pool::{self, txpool::{Pool as TransactionPool}};
+use inherents::InherentDataProviders;
+use network::construct_simple_protocol;
+use substrate_executor::native_executor_instance;
+pub use substrate_executor::NativeExecutor;
+
+// Our native executor instance.
+native_executor_instance!(
+	pub Executor,
+	substrate_kitties_runtime::api::dispatch,
+	substrate_kitties_runtime::native_version
+);
+
+construct_simple_protocol! {
+	/// Demo protocol attachment for substrate.
+	pub struct NodeProtocol where Block = Block { }
+}
+
+/// Starts a `ServiceBuilder` for a full service.
+///
+/// Use this macro if you don't actually need the full service, but just the builder in order to
+/// be able to perform chain operations.
+macro_rules! new_full_start {
+	($config:expr) => {{
+		let mut import_setup = None;
+		let inherent_data_providers = inherents::InherentDataProviders::new();
+		let mut tasks_to_spawn = None;
+
+		let builder = substrate_service::ServiceBuilder::new_full::<
+			substrate_kitties_runtime::opaque::Block, substrate_kitties_runtime::RuntimeApi, crate::service::Executor
+		>($config)?
+			.with_select_chain(|_config, backend| {
+				Ok(substrate_client::LongestChain::new(backend.clone()))
+			})?
+			.with_transaction_pool(|config, client|
+				Ok(transaction_pool::txpool::Pool::new(config, transaction_pool::ChainApi::new(client)))
+			)?
+			.with_import_queue(|_config, client, mut select_chain, transaction_pool| {
+				let select_chain = select_chain.take()
+					.ok_or_else(|| substrate_service::Error::SelectChainRequired)?;
+				let (block_import, link_half) =
+					grandpa::block_import::<_, _, _, substrate_kitties_runtime::RuntimeApi, _, _>(
+						client.clone(), client.clone(), select_chain
+					)?;
+				let justification_import = block_import.clone();
+
+				let (import_queue, babe_link, babe_block_import, pruning_task) = babe::import_queue(
+					babe::Config::get_or_compute(&*client)?,
+					block_import,
+					Some(Box::new(justification_import)),
+					None,
+					client.clone(),
+					client,
+					inherent_data_providers.clone(),
+					Some(transaction_pool)
+				)?;
+
+				import_setup = Some((babe_block_import.clone(), link_half, babe_link));
+				tasks_to_spawn = Some(vec![Box::new(pruning_task)]);
+
+				Ok(import_queue)
+			})?;
+
+		(builder, import_setup, inherent_data_providers, tasks_to_spawn)
+	}}
+}
+
+/// Builds a new service for a full client.
+pub fn new_full<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+
+	let is_authority = config.roles.is_authority();
+	let name = config.name.clone();
+	let disable_grandpa = config.disable_grandpa;
+	let force_authoring = config.force_authoring;
+
+	let (builder, mut import_setup, inherent_data_providers, mut tasks_to_spawn) = new_full_start!(config);
+
+	let service = builder.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()?;
+
+	let (block_import, link_half, babe_link) =
+		import_setup.take()
+			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
+
+	// spawn any futures that were created in the previous setup steps
+	if let Some(tasks) = tasks_to_spawn.take() {
+		for task in tasks {
+			service.spawn_task(
+				task.select(service.on_exit())
+					.map(|_| ())
+					.map_err(|_| ())
+			);
+		}
+	}
+
+	if is_authority {
+		let proposer = basic_authorship::ProposerFactory {
+			client: service.client(),
+			transaction_pool: service.transaction_pool(),
+		};
+
+		let client = service.client();
+		let select_chain = service.select_chain()
+			.ok_or(ServiceError::SelectChainRequired)?;
+
+		let babe_config = babe::BabeParams {
+			config: Config::get_or_compute(&*client)?,
+			keystore: service.keystore(),
+			client,
+			select_chain,
+			block_import,
+			env: proposer,
+			sync_oracle: service.network(),
+			inherent_data_providers: inherent_data_providers.clone(),
+			force_authoring: force_authoring,
+			time_source: babe_link,
+		};
+
+		let babe = start_babe(babe_config)?;
+		let select = babe.select(service.on_exit()).then(|_| Ok(()));
+
+		// the BABE authoring task is considered infallible, i.e. if it
+		// fails we take down the service with it.
+		service.spawn_essential_task(select);
+	}
+
+	let grandpa_config = grandpa::Config {
+		// FIXME #1578 make this available through chainspec
+		gossip_duration: Duration::from_millis(333),
+		justification_period: 4096,
+		name: Some(name),
+		keystore: Some(service.keystore()),
+	};
+
+	match (is_authority, disable_grandpa) {
+		(false, false) => {
+			// start the lightweight GRANDPA observer
+			service.spawn_task(Box::new(grandpa::run_grandpa_observer(
+				grandpa_config,
+				link_half,
+				service.network(),
+				service.on_exit(),
+			)?));
+		},
+		(true, false) => {
+			// start the full GRANDPA voter
+			let voter_config = grandpa::GrandpaParams {
+				config: grandpa_config,
+				link: link_half,
+				network: service.network(),
+				inherent_data_providers: inherent_data_providers.clone(),
+				on_exit: service.on_exit(),
+				telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
+			};
+
+			// the GRANDPA voter task is considered infallible, i.e.
+			// if it fails we take down the service with it.
+			service.spawn_essential_task(grandpa::run_grandpa_voter(voter_config)?);
+		},
+		(_, true) => {
+			grandpa::setup_disabled_grandpa(
+				service.client(),
+				&inherent_data_providers,
+				service.network(),
+			)?;
+		},
+	}
+
+	Ok(service)
+}
+
+/// Builds a new service for a light client.
+pub fn new_light<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+	let inherent_data_providers = InherentDataProviders::new();
+
+	ServiceBuilder::new_light::<Block, RuntimeApi, Executor>(config)?
+		.with_select_chain(|_config, backend| {
+			Ok(LongestChain::new(backend.clone()))
+		})?
+		.with_transaction_pool(|config, client|
+			Ok(TransactionPool::new(config, transaction_pool::ChainApi::new(client)))
+		)?
+		.with_import_queue_and_fprb(|_config, client, backend, _select_chain, transaction_pool| {
+			let fetch_checker = backend.blockchain().fetcher()
+				.upgrade()
+				.map(|fetcher| fetcher.checker().clone())
+				.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
+			let block_import = grandpa::light_block_import::<_, _, _, RuntimeApi, _>(
+				client.clone(), backend, Arc::new(fetch_checker), client.clone()
+			)?;
+
+			let finality_proof_import = block_import.clone();
+			let finality_proof_request_builder =
+				finality_proof_import.create_finality_proof_request_builder();
+
+			// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
+			let (import_queue, ..) = import_queue(
+				Config::get_or_compute(&*client)?,
+				block_import,
+				None,
+				Some(Box::new(finality_proof_import)),
+				client.clone(),
+				client,
+				inherent_data_providers.clone(),
+				Some(transaction_pool)
+			)?;
+
+			Ok((import_queue, finality_proof_request_builder))
+		})?
+		.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()
+}
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new file mode 100644
index 0000000..d0017e2
--- /dev/null
+++ b/projects/lesson-7/Cargo.lock
@@ -0,0 +1,5518 @@
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diff --git a/projects/lesson-7/Cargo.toml b/projects/lesson-7/Cargo.toml
new file mode 100644
index 0000000..551c9ef
--- /dev/null
+++ b/projects/lesson-7/Cargo.toml
@@ -0,0 +1,103 @@
+[package]
+authors = ['Bryan Chen']
+build = 'build.rs'
+edition = '2018'
+name = 'substrate-kitties'
+version = '2.0.0'
+
+[build-dependencies]
+vergen = '3'
+
+[workspace]
+members = ['runtime']
+
+[dependencies]
+derive_more = '0.14.0'
+exit-future = '0.1'
+futures = '0.1'
+log = '0.4'
+parking_lot = '0.9.0'
+tokio = '0.1'
+trie-root = '0.15.2'
+
+[dependencies.babe]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.basic-authorship]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-basic-authorship'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.ctrlc]
+features = ['termination']
+version = '3.0'
+
+[dependencies.grandpa]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa-primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-finality-grandpa-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.inherents]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-inherents'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.network]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-network'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-kitties-runtime]
+path = 'runtime'
+
+[dependencies.primitives]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sr-io]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-cli]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-client]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-executor]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-service]
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.transaction-pool]
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-transaction-pool'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[[bin]]
+name = 'substrate-kitties'
+path = 'src/main.rs'
+[profile.release]
+panic = 'unwind'
diff --git a/projects/lesson-7/LICENSE b/projects/lesson-7/LICENSE
new file mode 100644
index 0000000..cf1ab25
--- /dev/null
+++ b/projects/lesson-7/LICENSE
@@ -0,0 +1,24 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>
diff --git a/projects/lesson-7/README.md b/projects/lesson-7/README.md
new file mode 100644
index 0000000..5a59652
--- /dev/null
+++ b/projects/lesson-7/README.md
@@ -0,0 +1,70 @@
+# Substrate Node Template
+
+A new SRML-based Substrate node, ready for hacking.
+
+## Build
+
+Install Rust:
+
+```bash
+curl https://sh.rustup.rs -sSf | sh
+```
+
+Install required tools:
+
+```bash
+./scripts/init.sh
+```
+
+Build Wasm and native code:
+
+```bash
+cargo build
+```
+
+## Run
+
+### Single node development chain
+
+You can start a development chain with:
+
+```bash
+cargo run -- --dev
+```
+
+Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.
+
+### Multi-node local testnet
+
+If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.
+
+Optionally, give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet).
+
+You'll need two terminal windows open.
+
+We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR`, which is generated from the `--node-key` value that we specify below:
+
+```bash
+cargo run -- \
+  --base-path /tmp/alice \
+  --chain=local \
+  --alice \
+  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:
+
+```bash
+cargo run -- \
+  --base-path /tmp/bob \
+  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
+  --chain=local \
+  --bob \
+  --port 30334 \
+  --telemetry-url ws://telemetry.polkadot.io:1024 \
+  --validator
+```
+
+Additional CLI usage options are available and may be shown by running `cargo run -- --help`.
diff --git a/projects/lesson-7/build.rs b/projects/lesson-7/build.rs
new file mode 100644
index 0000000..bab46f5
--- /dev/null
+++ b/projects/lesson-7/build.rs
@@ -0,0 +1,24 @@
+use std::{env, path::PathBuf};
+
+use vergen::{ConstantsFlags, generate_cargo_keys};
+
+const ERROR_MSG: &str = "Failed to generate metadata files";
+
+fn main() {
+	generate_cargo_keys(ConstantsFlags::SHA_SHORT).expect(ERROR_MSG);
+
+	let mut manifest_dir = PathBuf::from(
+		env::var("CARGO_MANIFEST_DIR").expect("`CARGO_MANIFEST_DIR` is always set by cargo.")
+	);
+
+	while manifest_dir.parent().is_some() {
+		if manifest_dir.join(".git/HEAD").exists() {
+			println!("cargo:rerun-if-changed={}", manifest_dir.join(".git/HEAD").display());
+			return
+		}
+
+		manifest_dir.pop();
+	}
+
+	println!("cargo:warning=Could not find `.git/HEAD` from manifest dir!");
+}
diff --git a/projects/lesson-7/runtime/Cargo.toml b/projects/lesson-7/runtime/Cargo.toml
new file mode 100644
index 0000000..81ad433
--- /dev/null
+++ b/projects/lesson-7/runtime/Cargo.toml
@@ -0,0 +1,155 @@
+[features]
+default = ['std']
+no_std = []
+std = [
+    'codec/std',
+    'client/std',
+    'rstd/std',
+    'runtime-io/std',
+    'support/std',
+    'balances/std',
+    'babe/std',
+    'babe-primitives/std',
+    'executive/std',
+    'indices/std',
+    'grandpa/std',
+    'primitives/std',
+    'sr-primitives/std',
+    'system/std',
+    'timestamp/std',
+    'sudo/std',
+    'version/std',
+    'serde',
+    'safe-mix/std',
+    'offchain-primitives/std',
+    'substrate-session/std',
+]
+[build-dependencies.wasm-builder-runner]
+package = 'substrate-wasm-builder-runner'
+version = '1.0.2'
+
+[package]
+authors = ['Bryan Chen']
+edition = '2018'
+name = 'substrate-kitties-runtime'
+version = '2.0.0'
+[dependencies.babe]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-babe'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.babe-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-consensus-babe-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.balances]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-balances'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.client]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-client'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.codec]
+default-features = false
+features = ['derive']
+package = 'parity-scale-codec'
+version = '1.0.0'
+
+[dependencies.executive]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-executive'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.grandpa]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-grandpa'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.indices]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-indices'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.offchain-primitives]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-offchain-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'substrate-primitives'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.rstd]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-std'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.runtime-io]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-io'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.safe-mix]
+default-features = false
+version = '1.0'
+
+[dependencies.serde]
+features = ['derive']
+optional = true
+version = '1.0'
+
+[dependencies.sr-primitives]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.substrate-session]
+default-features = false
+git = 'https://github.com/paritytech/substrate.git'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.sudo]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-sudo'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.support]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-support'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.system]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-system'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.timestamp]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'srml-timestamp'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
+
+[dependencies.version]
+default_features = false
+git = 'https://github.com/paritytech/substrate.git'
+package = 'sr-version'
+rev = 'ac6a2a783f0e1f4a814cf2add40275730cd41be1'
diff --git a/projects/lesson-7/runtime/build.rs b/projects/lesson-7/runtime/build.rs
new file mode 100644
index 0000000..1ed109d
--- /dev/null
+++ b/projects/lesson-7/runtime/build.rs
@@ -0,0 +1,27 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use wasm_builder_runner::{build_current_project_with_rustflags, WasmBuilderSource};
+
+fn main() {
+	build_current_project_with_rustflags(
+		"wasm_binary.rs",
+		WasmBuilderSource::Crates("1.0.5"),
+		// This instructs LLD to export __heap_base as a global variable, which is used by the
+		// external memory allocator.
+		"-Clink-arg=--export=__heap_base",
+	);
+}
diff --git a/projects/lesson-7/runtime/src/kitties.rs b/projects/lesson-7/runtime/src/kitties.rs
new file mode 100644
index 0000000..05681a3
--- /dev/null
+++ b/projects/lesson-7/runtime/src/kitties.rs
@@ -0,0 +1,397 @@
+use support::{
+	decl_module, decl_storage, decl_event, ensure, StorageValue, StorageMap,
+	Parameter, traits::Currency
+};
+use sr_primitives::traits::{SimpleArithmetic, Bounded, Member};
+use codec::{Encode, Decode};
+use runtime_io::blake2_128;
+use system::ensure_signed;
+use rstd::result;
+use crate::linked_item::{LinkedList, LinkedItem};
+
+pub trait Trait: system::Trait {
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+	type KittyIndex: Parameter + Member + SimpleArithmetic + Bounded + Default + Copy;
+	type Currency: Currency<Self::AccountId>;
+}
+
+type BalanceOf<T> = <<T as Trait>::Currency as Currency<<T as system::Trait>::AccountId>>::Balance;
+
+#[derive(Encode, Decode)]
+pub struct Kitty(pub [u8; 16]);
+
+type KittyLinkedItem<T> = LinkedItem<<T as Trait>::KittyIndex>;
+type OwnedKittiesList<T> = LinkedList<OwnedKitties<T>, <T as system::Trait>::AccountId, <T as Trait>::KittyIndex>;
+
+decl_storage! {
+	trait Store for Module<T: Trait> as Kitties {
+		/// Stores all the kitties, key is the kitty id / index
+		pub Kitties get(kitty): map T::KittyIndex => Option<Kitty>;
+		/// Stores the total number of kitties. i.e. the next kitty index
+		pub KittiesCount get(kitties_count): T::KittyIndex;
+
+		pub OwnedKitties get(owned_kitties): map (T::AccountId, Option<T::KittyIndex>) => Option<KittyLinkedItem<T>>;
+
+		/// Get kitty owner
+		pub KittyOwners get(kitty_owner): map T::KittyIndex => Option<T::AccountId>;
+		/// Get kitty price. None means not for sale.
+		pub KittyPrices get(kitty_price): map T::KittyIndex => Option<BalanceOf<T>>
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where
+		<T as system::Trait>::AccountId,
+		<T as Trait>::KittyIndex,
+		Balance = BalanceOf<T>,
+	{
+		/// A kitty is created. (owner, kitty_id)
+		Created(AccountId, KittyIndex),
+		/// A kitty is transferred. (from, to, kitty_id)
+		Transferred(AccountId, AccountId, KittyIndex),
+		/// A kitty is available for sale. (owner, kitty_id, price)
+		Ask(AccountId, KittyIndex, Option<Balance>),
+		/// A kitty is sold. (from, to, kitty_id, price)
+		Sold(AccountId, AccountId, KittyIndex, Balance),
+	}
+);
+
+decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		fn deposit_event() = default;
+
+		/// Create a new kitty
+		pub fn create(origin) {
+			let sender = ensure_signed(origin)?;
+			let kitty_id = Self::next_kitty_id()?;
+
+			// Generate a random 128bit value
+			let dna = Self::random_value(&sender);
+
+			// Create and store kitty
+			let kitty = Kitty(dna);
+			Self::insert_kitty(&sender, kitty_id, kitty);
+
+			Self::deposit_event(RawEvent::Created(sender, kitty_id));
+		}
+
+		/// Breed kitties
+		pub fn breed(origin, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) {
+			let sender = ensure_signed(origin)?;
+
+			let new_kitty_id = Self::do_breed(&sender, kitty_id_1, kitty_id_2)?;
+
+			Self::deposit_event(RawEvent::Created(sender, new_kitty_id));
+		}
+
+		/// Transfer a kitty to new owner
+ 		pub fn transfer(origin, to: T::AccountId, kitty_id: T::KittyIndex) {
+ 			let sender = ensure_signed(origin)?;
+
+  			ensure!(<OwnedKitties<T>>::exists(&(sender.clone(), Some(kitty_id))), "Only owner can transfer kitty");
+
+			Self::do_transfer(&sender, &to, kitty_id);
+
+			Self::deposit_event(RawEvent::Transferred(sender, to, kitty_id));
+		}
+
+		/// Set a price for a kitty for sale
+		/// None to delist the kitty
+		pub fn ask(origin, kitty_id: T::KittyIndex, price: Option<BalanceOf<T>>) {
+			let sender = ensure_signed(origin)?;
+
+			ensure!(<OwnedKitties<T>>::exists(&(sender.clone(), Some(kitty_id))), "Only owner can set price for kitty");
+
+			if let Some(ref price) = price {
+				<KittyPrices<T>>::insert(kitty_id, price);
+			} else {
+				<KittyPrices<T>>::remove(kitty_id);
+			}
+
+			Self::deposit_event(RawEvent::Ask(sender, kitty_id, price));
+		}
+
+		pub fn buy(origin, kitty_id: T::KittyIndex, price: BalanceOf<T>) {
+			let sender = ensure_signed(origin)?;
+
+			let owner = Self::kitty_owner(kitty_id);
+			ensure!(owner.is_some(), "Kitty does not exist");
+			let owner = owner.unwrap();
+
+			let kitty_price = Self::kitty_price(kitty_id);
+			ensure!(kitty_price.is_some(), "Kitty not for sale");
+
+			let kitty_price = kitty_price.unwrap();
+			ensure!(price >= kitty_price, "Price is too low");
+
+			T::Currency::transfer(&sender, &owner, kitty_price)?;
+
+			<KittyPrices<T>>::remove(kitty_id);
+
+			Self::do_transfer(&owner, &sender, kitty_id);
+
+			Self::deposit_event(RawEvent::Sold(owner, sender, kitty_id, kitty_price));
+		}
+	}
+}
+
+fn combine_dna(dna1: u8, dna2: u8, selector: u8) -> u8 {
+	((selector & dna1) | (!selector & dna2))
+}
+
+impl<T: Trait> Module<T> {
+	fn random_value(sender: &T::AccountId) -> [u8; 16] {
+		let payload = (<system::Module<T>>::random_seed(), sender, <system::Module<T>>::extrinsic_index(), <system::Module<T>>::block_number());
+		payload.using_encoded(blake2_128)
+	}
+
+	fn next_kitty_id() -> result::Result<T::KittyIndex, &'static str> {
+		let kitty_id = Self::kitties_count();
+		if kitty_id == T::KittyIndex::max_value() {
+			return Err("Kitties count overflow");
+		}
+		Ok(kitty_id)
+	}
+
+	fn insert_owned_kitty(owner: &T::AccountId, kitty_id: T::KittyIndex) {
+		<OwnedKittiesList<T>>::append(owner, kitty_id);
+	}
+
+	fn insert_kitty(owner: &T::AccountId, kitty_id: T::KittyIndex, kitty: Kitty) {
+		// Create and store kitty
+		<Kitties<T>>::insert(kitty_id, kitty);
+		<KittiesCount<T>>::put(kitty_id + 1.into());
+		<KittyOwners<T>>::insert(kitty_id, owner.clone());
+
+		Self::insert_owned_kitty(owner, kitty_id);
+	}
+
+	fn do_breed(sender: &T::AccountId, kitty_id_1: T::KittyIndex, kitty_id_2: T::KittyIndex) -> result::Result<T::KittyIndex, &'static str> {
+		let kitty1 = Self::kitty(kitty_id_1);
+		let kitty2 = Self::kitty(kitty_id_2);
+
+		ensure!(kitty1.is_some(), "Invalid kitty_id_1");
+		ensure!(kitty2.is_some(), "Invalid kitty_id_2");
+		ensure!(kitty_id_1 != kitty_id_2, "Needs different parent");
+		ensure!(Self::kitty_owner(&kitty_id_1).map(|owner| owner == *sender).unwrap_or(false), "Not onwer of kitty1");
+ 		ensure!(Self::kitty_owner(&kitty_id_2).map(|owner| owner == *sender).unwrap_or(false), "Not owner of kitty2");
+
+		let kitty_id = Self::next_kitty_id()?;
+
+		let kitty1_dna = kitty1.unwrap().0;
+		let kitty2_dna = kitty2.unwrap().0;
+
+		// Generate a random 128bit value
+		let selector = Self::random_value(&sender);
+		let mut new_dna = [0u8; 16];
+
+		// Combine parents and selector to create new kitty
+		for i in 0..kitty1_dna.len() {
+			new_dna[i] = combine_dna(kitty1_dna[i], kitty2_dna[i], selector[i]);
+		}
+
+		Self::insert_kitty(sender, kitty_id, Kitty(new_dna));
+
+		Ok(kitty_id)
+	}
+
+	fn do_transfer(from: &T::AccountId, to: &T::AccountId, kitty_id: T::KittyIndex)  {
+ 		<OwnedKittiesList<T>>::remove(&from, kitty_id);
+ 		<OwnedKittiesList<T>>::append(&to, kitty_id);
+ 		<KittyOwners<T>>::insert(kitty_id, to);
+ 	}
+}
+
+/// Tests for Kitties module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq, Debug)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	parameter_types! {
+		pub const ExistentialDeposit: u64 = 0;
+		pub const TransferFee: u64 = 0;
+		pub const CreationFee: u64 = 0;
+		pub const TransactionBaseFee: u64 = 0;
+		pub const TransactionByteFee: u64 = 0;
+	}
+	impl balances::Trait for Test {
+		type Balance = u64;
+		type OnFreeBalanceZero = ();
+		type OnNewAccount = ();
+		type Event = ();
+		type TransactionPayment = ();
+		type TransferPayment = ();
+		type DustRemoval = ();
+		type ExistentialDeposit = ExistentialDeposit;
+		type TransferFee = TransferFee;
+		type CreationFee = CreationFee;
+		type TransactionBaseFee = TransactionBaseFee;
+		type TransactionByteFee = TransactionByteFee;
+		type WeightToFee = ();
+	}
+	impl Trait for Test {
+		type KittyIndex = u32;
+		type Currency = balances::Module<Test>;
+		type Event = ();
+	}
+	type OwnedKittiesTest = OwnedKitties<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn owned_kitties_can_append_values() {
+		with_externalities(&mut new_test_ext(), || {
+			OwnedKittiesList::<Test>::append(&0, 1);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem::<Test> {
+				prev: Some(1),
+				next: Some(1),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem::<Test> {
+				prev: None,
+				next: None,
+			}));
+
+			OwnedKittiesList::<Test>::append(&0, 2);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem::<Test> {
+				prev: Some(2),
+				next: Some(1),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem::<Test> {
+				prev: None,
+				next: Some(2),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), Some(KittyLinkedItem::<Test> {
+				prev: Some(1),
+				next: None,
+			}));
+
+			OwnedKittiesList::<Test>::append(&0, 3);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem::<Test> {
+				prev: Some(3),
+				next: Some(1),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem::<Test> {
+				prev: None,
+				next: Some(2),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), Some(KittyLinkedItem::<Test> {
+				prev: Some(1),
+				next: Some(3),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem::<Test> {
+				prev: Some(2),
+				next: None,
+			}));
+		});
+	}
+
+	#[test]
+	fn owned_kitties_can_remove_values() {
+		with_externalities(&mut new_test_ext(), || {
+			OwnedKittiesList::<Test>::append(&0, 1);
+			OwnedKittiesList::<Test>::append(&0, 2);
+			OwnedKittiesList::<Test>::append(&0, 3);
+
+			OwnedKittiesList::<Test>::remove(&0, 2);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem::<Test> {
+				prev: Some(3),
+				next: Some(1),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), Some(KittyLinkedItem::<Test> {
+				prev: None,
+				next: Some(3),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem::<Test> {
+				prev: Some(1),
+				next: None,
+			}));
+
+			OwnedKittiesList::<Test>::remove(&0, 1);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem::<Test> {
+				prev: Some(3),
+				next: Some(3),
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), None);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(3))), Some(KittyLinkedItem::<Test> {
+				prev: None,
+				next: None,
+			}));
+
+			OwnedKittiesList::<Test>::remove(&0, 3);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, None)), Some(KittyLinkedItem::<Test> {
+				prev: None,
+				next: None,
+			}));
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(1))), None);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+
+			assert_eq!(OwnedKittiesTest::get(&(0, Some(2))), None);
+		});
+	}
+}
diff --git a/projects/lesson-7/runtime/src/lib.rs b/projects/lesson-7/runtime/src/lib.rs
new file mode 100644
index 0000000..eaa3349
--- /dev/null
+++ b/projects/lesson-7/runtime/src/lib.rs
@@ -0,0 +1,421 @@
+//! The Substrate Node Template runtime. This can be compiled with `#[no_std]`, ready for Wasm.
+
+#![cfg_attr(not(feature = "std"), no_std)]
+// `construct_runtime!` does a lot of recursion and requires us to increase the limit to 256.
+#![recursion_limit="256"]
+
+// Make the WASM binary available.
+#[cfg(feature = "std")]
+include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
+
+use rstd::prelude::*;
+use primitives::{OpaqueMetadata, crypto::key_types};
+use sr_primitives::{
+	ApplyResult, transaction_validity::TransactionValidity, generic, create_runtime_str,
+	impl_opaque_keys, AnySignature
+};
+use sr_primitives::traits::{NumberFor, BlakeTwo256, Block as BlockT, DigestFor, StaticLookup, Verify, ConvertInto};
+use sr_primitives::weights::Weight;
+use babe::{AuthorityId as BabeId};
+use grandpa::{AuthorityId as GrandpaId, AuthorityWeight as GrandpaWeight};
+use grandpa::fg_primitives::{self, ScheduledChange};
+use client::{
+	block_builder::api::{CheckInherentsResult, InherentData, self as block_builder_api},
+	runtime_api as client_api, impl_runtime_apis
+};
+use version::RuntimeVersion;
+#[cfg(feature = "std")]
+use version::NativeVersion;
+
+// A few exports that help ease life for downstream crates.
+#[cfg(any(feature = "std", test))]
+pub use sr_primitives::BuildStorage;
+pub use timestamp::Call as TimestampCall;
+pub use balances::Call as BalancesCall;
+pub use sr_primitives::{Permill, Perbill};
+pub use support::{StorageValue, construct_runtime, parameter_types};
+
+/// An index to a block.
+pub type BlockNumber = u32;
+
+/// Alias to 512-bit hash when used in the context of a transaction signature on the chain.
+pub type Signature = AnySignature;
+
+/// Some way of identifying an account on the chain. We intentionally make it equivalent
+/// to the public key of our transaction signing scheme.
+pub type AccountId = <Signature as Verify>::Signer;
+
+/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
+/// never know...
+pub type AccountIndex = u32;
+
+/// Balance of an account.
+pub type Balance = u128;
+
+/// Index of a transaction in the chain.
+pub type Index = u32;
+
+/// A hash of some data used by the chain.
+pub type Hash = primitives::H256;
+
+/// Digest item type.
+pub type DigestItem = generic::DigestItem<Hash>;
+
+/// Used for the module template in `./template.rs`
+mod template;
+
+/// Used for the module kitties in `./kitties.rs`
+mod kitties;
+
+mod linked_item;
+
+/// Opaque types. These are used by the CLI to instantiate machinery that don't need to know
+/// the specifics of the runtime. They can then be made to be agnostic over specific formats
+/// of data like extrinsics, allowing for them to continue syncing the network through upgrades
+/// to even the core datastructures.
+pub mod opaque {
+	use super::*;
+
+	pub use sr_primitives::OpaqueExtrinsic as UncheckedExtrinsic;
+
+	/// Opaque block header type.
+	pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// Opaque block type.
+	pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+	/// Opaque block identifier type.
+	pub type BlockId = generic::BlockId<Block>;
+
+	pub type SessionHandlers = (Grandpa, Babe);
+
+	impl_opaque_keys! {
+		pub struct SessionKeys {
+			#[id(key_types::GRANDPA)]
+			pub grandpa: GrandpaId,
+			#[id(key_types::BABE)]
+			pub babe: BabeId,
+		}
+	}
+}
+
+/// This runtime version.
+pub const VERSION: RuntimeVersion = RuntimeVersion {
+	spec_name: create_runtime_str!("substrate-kitties"),
+	impl_name: create_runtime_str!("substrate-kitties"),
+	authoring_version: 3,
+	spec_version: 4,
+	impl_version: 4,
+	apis: RUNTIME_API_VERSIONS,
+};
+
+/// Constants for Babe.
+
+/// Since BABE is probabilistic this is the average expected block time that
+/// we are targetting. Blocks will be produced at a minimum duration defined
+/// by `SLOT_DURATION`, but some slots will not be allocated to any
+/// authority and hence no block will be produced. We expect to have this
+/// block time on average following the defined slot duration and the value
+/// of `c` configured for BABE (where `1 - c` represents the probability of
+/// a slot being empty).
+/// This value is only used indirectly to define the unit constants below
+/// that are expressed in blocks. The rest of the code should use
+/// `SLOT_DURATION` instead (like the timestamp module for calculating the
+/// minimum period).
+/// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+pub const MILLISECS_PER_BLOCK: u64 = 6000;
+
+pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;
+
+pub const EPOCH_DURATION_IN_BLOCKS: u32 = 10 * MINUTES;
+
+// These time units are defined in number of blocks.
+pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
+pub const HOURS: BlockNumber = MINUTES * 60;
+pub const DAYS: BlockNumber = HOURS * 24;
+
+// 1 in 4 blocks (on average, not counting collisions) will be primary babe blocks.
+pub const PRIMARY_PROBABILITY: (u64, u64) = (1, 4);
+
+/// The version infromation used to identify this runtime when compiled natively.
+#[cfg(feature = "std")]
+pub fn native_version() -> NativeVersion {
+	NativeVersion {
+		runtime_version: VERSION,
+		can_author_with: Default::default(),
+	}
+}
+
+parameter_types! {
+	pub const BlockHashCount: BlockNumber = 250;
+	pub const MaximumBlockWeight: Weight = 1_000_000;
+	pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	pub const MaximumBlockLength: u32 = 5 * 1024 * 1024;
+	pub const Version: RuntimeVersion = VERSION;
+}
+
+impl system::Trait for Runtime {
+	/// The identifier used to distinguish between accounts.
+	type AccountId = AccountId;
+	/// The aggregated dispatch type that is available for extrinsics.
+	type Call = Call;
+	/// The lookup mechanism to get account ID from whatever is passed in dispatchers.
+	type Lookup = Indices;
+	/// The index type for storing how many extrinsics an account has signed.
+	type Index = Index;
+	/// The index type for blocks.
+	type BlockNumber = BlockNumber;
+	/// The type for hashing blocks and tries.
+	type Hash = Hash;
+	/// The hashing algorithm used.
+	type Hashing = BlakeTwo256;
+	/// The header type.
+	type Header = generic::Header<BlockNumber, BlakeTwo256>;
+	/// The ubiquitous event type.
+	type Event = Event;
+	/// Update weight (to fee) multiplier per-block.
+	type WeightMultiplierUpdate = ();
+	/// The ubiquitous origin type.
+	type Origin = Origin;
+	/// Maximum number of block number to block hash mappings to keep (oldest pruned first).
+	type BlockHashCount = BlockHashCount;
+	/// Maximum weight of each block. With a default weight system of 1byte == 1weight, 4mb is ok.
+	type MaximumBlockWeight = MaximumBlockWeight;
+	/// Maximum size of all encoded transactions (in bytes) that are allowed in one block.
+	type MaximumBlockLength = MaximumBlockLength;
+	/// Portion of the block weight that is available to all normal transactions.
+	type AvailableBlockRatio = AvailableBlockRatio;
+	type Version = Version;
+}
+
+parameter_types! {
+	pub const EpochDuration: u64 = EPOCH_DURATION_IN_BLOCKS as u64;
+	pub const ExpectedBlockTime: u64 = MILLISECS_PER_BLOCK;
+}
+
+impl babe::Trait for Runtime {
+	type EpochDuration = EpochDuration;
+	type ExpectedBlockTime = ExpectedBlockTime;
+}
+
+impl grandpa::Trait for Runtime {
+	type Event = Event;
+}
+
+impl indices::Trait for Runtime {
+	/// The type for recording indexing into the account enumeration. If this ever overflows, there
+	/// will be problems!
+	type AccountIndex = u32;
+	/// Use the standard means of resolving an index hint from an id.
+	type ResolveHint = indices::SimpleResolveHint<Self::AccountId, Self::AccountIndex>;
+	/// Determine whether an account is dead.
+	type IsDeadAccount = Balances;
+	/// The ubiquitous event type.
+	type Event = Event;
+}
+
+parameter_types! {
+	pub const MinimumPeriod: u64 = 1000;
+}
+
+impl timestamp::Trait for Runtime {
+	/// A timestamp: milliseconds since the unix epoch.
+	type Moment = u64;
+	type OnTimestampSet = Babe;
+	type MinimumPeriod = MinimumPeriod;
+}
+
+parameter_types! {
+	pub const ExistentialDeposit: u128 = 500;
+	pub const TransferFee: u128 = 0;
+	pub const CreationFee: u128 = 0;
+	pub const TransactionBaseFee: u128 = 0;
+	pub const TransactionByteFee: u128 = 1;
+}
+
+impl balances::Trait for Runtime {
+	/// The type for recording an account's balance.
+	type Balance = Balance;
+	/// What to do if an account's free balance gets zeroed.
+	type OnFreeBalanceZero = ();
+	/// What to do if a new account is created.
+	type OnNewAccount = Indices;
+	/// The ubiquitous event type.
+	type Event = Event;
+	type TransactionPayment = ();
+	type DustRemoval = ();
+	type TransferPayment = ();
+	type ExistentialDeposit = ExistentialDeposit;
+	type TransferFee = TransferFee;
+	type CreationFee = CreationFee;
+	type TransactionBaseFee = TransactionBaseFee;
+	type TransactionByteFee = TransactionByteFee;
+	type WeightToFee = ConvertInto;
+}
+
+impl sudo::Trait for Runtime {
+	type Event = Event;
+	type Proposal = Call;
+}
+
+/// Used for the module template in `./template.rs`
+impl template::Trait for Runtime {
+	type Event = Event;
+}
+
+impl kitties::Trait for Runtime {
+	type Event = Event;
+	type KittyIndex = u32;
+	type Currency = Balances;
+}
+
+construct_runtime!(
+	pub enum Runtime where
+		Block = Block,
+		NodeBlock = opaque::Block,
+		UncheckedExtrinsic = UncheckedExtrinsic
+	{
+		System: system::{Module, Call, Storage, Config, Event},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
+		Babe: babe::{Module, Call, Storage, Config, Inherent(Timestamp)},
+		Grandpa: grandpa::{Module, Call, Storage, Config, Event},
+		Indices: indices::{default, Config<T>},
+		Balances: balances::{default, Error},
+		Sudo: sudo,
+		// Used for the module template in `./template.rs`
+		TemplateModule: template::{Module, Call, Storage, Event<T>},
+		// Substrate Kitties module
+		Kitties: kitties::{Module, Storage, Call, Event<T>},
+	}
+);
+
+/// The address format for describing accounts.
+pub type Address = <Indices as StaticLookup>::Source;
+/// Block header type as expected by this runtime.
+pub type Header = generic::Header<BlockNumber, BlakeTwo256>;
+/// Block type as expected by this runtime.
+pub type Block = generic::Block<Header, UncheckedExtrinsic>;
+/// A Block signed with a Justification
+pub type SignedBlock = generic::SignedBlock<Block>;
+/// BlockId type as expected by this runtime.
+pub type BlockId = generic::BlockId<Block>;
+/// The SignedExtension to the basic transaction logic.
+pub type SignedExtra = (
+	system::CheckVersion<Runtime>,
+	system::CheckGenesis<Runtime>,
+	system::CheckEra<Runtime>,
+	system::CheckNonce<Runtime>,
+	system::CheckWeight<Runtime>,
+	balances::TakeFees<Runtime>
+);
+/// Unchecked extrinsic type as expected by this runtime.
+pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<Address, Call, Signature, SignedExtra>;
+/// Extrinsic type that has already been checked.
+pub type CheckedExtrinsic = generic::CheckedExtrinsic<AccountId, Call, SignedExtra>;
+/// Executive: handles dispatch to the various modules.
+pub type Executive = executive::Executive<Runtime, Block, system::ChainContext<Runtime>, Runtime, AllModules>;
+
+impl_runtime_apis! {
+	impl client_api::Core<Block> for Runtime {
+		fn version() -> RuntimeVersion {
+			VERSION
+		}
+
+		fn execute_block(block: Block) {
+			Executive::execute_block(block)
+		}
+
+		fn initialize_block(header: &<Block as BlockT>::Header) {
+			Executive::initialize_block(header)
+		}
+	}
+
+	impl client_api::Metadata<Block> for Runtime {
+		fn metadata() -> OpaqueMetadata {
+			Runtime::metadata().into()
+		}
+	}
+
+	impl block_builder_api::BlockBuilder<Block> for Runtime {
+		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
+			Executive::apply_extrinsic(extrinsic)
+		}
+
+		fn finalize_block() -> <Block as BlockT>::Header {
+			Executive::finalize_block()
+		}
+
+		fn inherent_extrinsics(data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
+			data.create_extrinsics()
+		}
+
+		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult {
+			data.check_extrinsics(&block)
+		}
+
+		fn random_seed() -> <Block as BlockT>::Hash {
+			System::random_seed()
+		}
+	}
+
+	impl client_api::TaggedTransactionQueue<Block> for Runtime {
+		fn validate_transaction(tx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
+			Executive::validate_transaction(tx)
+		}
+	}
+
+	impl offchain_primitives::OffchainWorkerApi<Block> for Runtime {
+		fn offchain_worker(number: NumberFor<Block>) {
+			Executive::offchain_worker(number)
+		}
+	}
+
+	impl fg_primitives::GrandpaApi<Block> for Runtime {
+		fn grandpa_pending_change(digest: &DigestFor<Block>)
+			-> Option<ScheduledChange<NumberFor<Block>>>
+		{
+			Grandpa::pending_change(digest)
+		}
+
+		fn grandpa_forced_change(digest: &DigestFor<Block>)
+			-> Option<(NumberFor<Block>, ScheduledChange<NumberFor<Block>>)>
+		{
+			Grandpa::forced_change(digest)
+		}
+
+		fn grandpa_authorities() -> Vec<(GrandpaId, GrandpaWeight)> {
+			Grandpa::grandpa_authorities()
+		}
+	}
+
+	impl babe_primitives::BabeApi<Block> for Runtime {
+		fn startup_data() -> babe_primitives::BabeConfiguration {
+			// The choice of `c` parameter (where `1 - c` represents the
+			// probability of a slot being empty), is done in accordance to the
+			// slot duration and expected target block time, for safely
+			// resisting network delays of maximum two seconds.
+			// <https://research.web3.foundation/en/latest/polkadot/BABE/Babe/#6-practical-results>
+			babe_primitives::BabeConfiguration {
+				median_required_blocks: 1000,
+				slot_duration: Babe::slot_duration(),
+				c: PRIMARY_PROBABILITY,
+			}
+		}
+
+		fn epoch() -> babe_primitives::Epoch {
+			babe_primitives::Epoch {
+				start_slot: Babe::epoch_start_slot(),
+				authorities: Babe::authorities(),
+				epoch_index: Babe::epoch_index(),
+				randomness: Babe::randomness(),
+				duration: EpochDuration::get(),
+				secondary_slots: Babe::secondary_slots().0,
+			}
+		}
+	}
+
+	impl substrate_session::SessionKeys<Block> for Runtime {
+		fn generate_session_keys(seed: Option<Vec<u8>>) -> Vec<u8> {
+			let seed = seed.as_ref().map(|s| rstd::str::from_utf8(&s).expect("Seed is an utf8 string"));
+			opaque::SessionKeys::generate(seed)
+		}
+	}
+}
diff --git a/projects/lesson-7/runtime/src/linked_item.rs b/projects/lesson-7/runtime/src/linked_item.rs
new file mode 100644
index 0000000..eeeea0a
--- /dev/null
+++ b/projects/lesson-7/runtime/src/linked_item.rs
@@ -0,0 +1,80 @@
+use support::{StorageMap, Parameter};
+use sr_primitives::traits::Member;
+use codec::{Encode, Decode};
+
+#[cfg_attr(feature = "std", derive(Debug, PartialEq, Eq))]
+#[derive(Encode, Decode)]
+pub struct LinkedItem<Value> {
+	pub prev: Option<Value>,
+	pub next: Option<Value>,
+}
+
+pub struct LinkedList<Storage, Key, Value>(rstd::marker::PhantomData<(Storage, Key, Value)>);
+
+impl<Storage, Key, Value> LinkedList<Storage, Key, Value> where
+    Value: Parameter + Member + Copy,
+    Key: Parameter,
+    Storage: StorageMap<(Key, Option<Value>), LinkedItem<Value>, Query = Option<LinkedItem<Value>>>,
+{
+    fn read_head(key: &Key) -> LinkedItem<Value> {
+		Self::read(key, None)
+	}
+
+	fn write_head(account: &Key, item: LinkedItem<Value>) {
+		Self::write(account, None, item);
+	}
+
+	fn read(key: &Key, value: Option<Value>) -> LinkedItem<Value> {
+		Storage::get(&(key.clone(), value)).unwrap_or_else(|| LinkedItem {
+			prev: None,
+			next: None,
+		})
+	}
+
+	fn write(key: &Key, value: Option<Value>, item: LinkedItem<Value>) {
+		Storage::insert(&(key.clone(), value), item);
+	}
+
+	pub fn append(key: &Key, value: Value) {
+		let head = Self::read_head(key);
+		let new_head = LinkedItem {
+			prev: Some(value),
+			next: head.next,
+		};
+
+		Self::write_head(key, new_head);
+
+		let prev = Self::read(key, head.prev);
+		let new_prev = LinkedItem {
+			prev: prev.prev,
+			next: Some(value),
+		};
+		Self::write(key, head.prev, new_prev);
+
+		let item = LinkedItem {
+			prev: head.prev,
+			next: None,
+		};
+		Self::write(key, Some(value), item);
+	}
+
+	pub fn remove(key: &Key, value: Value) {
+		if let Some(item) = Storage::take(&(key.clone(), Some(value))) {
+			let prev = Self::read(key, item.prev);
+			let new_prev = LinkedItem {
+				prev: prev.prev,
+				next: item.next,
+			};
+
+			Self::write(key, item.prev, new_prev);
+
+			let next = Self::read(key, item.next);
+			let new_next = LinkedItem {
+				prev: item.prev,
+				next: next.next,
+			};
+
+			Self::write(key, item.next, new_next);
+		}
+	}
+}
\ No newline at end of file
diff --git a/projects/lesson-7/runtime/src/template.rs b/projects/lesson-7/runtime/src/template.rs
new file mode 100644
index 0000000..c1fa6f2
--- /dev/null
+++ b/projects/lesson-7/runtime/src/template.rs
@@ -0,0 +1,133 @@
+/// A runtime module template with necessary imports
+
+/// Feel free to remove or edit this file as needed.
+/// If you change the name of this file, make sure to update its references in runtime/src/lib.rs
+/// If you remove this file, you can remove those references
+
+
+/// For more guidance on Substrate modules, see the example module
+/// https://github.com/paritytech/substrate/blob/master/srml/example/src/lib.rs
+
+use support::{decl_module, decl_storage, decl_event, StorageValue, dispatch::Result};
+use system::ensure_signed;
+
+/// The module's configuration trait.
+pub trait Trait: system::Trait {
+	// TODO: Add other types and constants required configure this module.
+
+	/// The overarching event type.
+	type Event: From<Event<Self>> + Into<<Self as system::Trait>::Event>;
+}
+
+// This module's storage items.
+decl_storage! {
+	trait Store for Module<T: Trait> as TemplateModule {
+		// Just a dummy storage item.
+		// Here we are declaring a StorageValue, `Something` as a Option<u32>
+		// `get(something)` is the default getter which returns either the stored `u32` or `None` if nothing stored
+		Something get(something): Option<u32>;
+	}
+}
+
+// The module's dispatchable functions.
+decl_module! {
+	/// The module declaration.
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+		// Initializing events
+		// this is needed only if you are using events in your module
+		fn deposit_event() = default;
+
+		// Just a dummy entry point.
+		// function that can be called by the external world as an extrinsics call
+		// takes a parameter of the type `AccountId`, stores it and emits an event
+		pub fn do_something(origin, something: u32) -> Result {
+			// TODO: You only need this if you want to check it was signed.
+			let who = ensure_signed(origin)?;
+
+			// TODO: Code to execute when something calls this.
+			// For example: the following line stores the passed in u32 in the storage
+			Something::put(something);
+
+			// here we are raising the Something event
+			Self::deposit_event(RawEvent::SomethingStored(something, who));
+			Ok(())
+		}
+	}
+}
+
+decl_event!(
+	pub enum Event<T> where AccountId = <T as system::Trait>::AccountId {
+		// Just a dummy event.
+		// Event `Something` is declared with a parameter of the type `u32` and `AccountId`
+		// To emit this event, we call the deposit funtion, from our runtime funtions
+		SomethingStored(u32, AccountId),
+	}
+);
+
+/// tests for this module
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	use runtime_io::with_externalities;
+	use primitives::{H256, Blake2Hasher};
+	use support::{impl_outer_origin, assert_ok, parameter_types};
+	use sr_primitives::{traits::{BlakeTwo256, IdentityLookup}, testing::Header};
+	use sr_primitives::weights::Weight;
+	use sr_primitives::Perbill;
+
+	impl_outer_origin! {
+		pub enum Origin for Test {}
+	}
+
+	// For testing the module, we construct most of a mock runtime. This means
+	// first constructing a configuration type (`Test`) which `impl`s each of the
+	// configuration traits of modules we want to use.
+	#[derive(Clone, Eq, PartialEq)]
+	pub struct Test;
+	parameter_types! {
+		pub const BlockHashCount: u64 = 250;
+		pub const MaximumBlockWeight: Weight = 1024;
+		pub const MaximumBlockLength: u32 = 2 * 1024;
+		pub const AvailableBlockRatio: Perbill = Perbill::from_percent(75);
+	}
+	impl system::Trait for Test {
+		type Origin = Origin;
+		type Call = ();
+		type Index = u64;
+		type BlockNumber = u64;
+		type Hash = H256;
+		type Hashing = BlakeTwo256;
+		type AccountId = u64;
+		type Lookup = IdentityLookup<Self::AccountId>;
+		type Header = Header;
+		type WeightMultiplierUpdate = ();
+		type Event = ();
+		type BlockHashCount = BlockHashCount;
+		type MaximumBlockWeight = MaximumBlockWeight;
+		type MaximumBlockLength = MaximumBlockLength;
+		type AvailableBlockRatio = AvailableBlockRatio;
+		type Version = ();
+	}
+	impl Trait for Test {
+		type Event = ();
+	}
+	type TemplateModule = Module<Test>;
+
+	// This function basically just builds a genesis storage key/value store according to
+	// our desired mockup.
+	fn new_test_ext() -> runtime_io::TestExternalities<Blake2Hasher> {
+		system::GenesisConfig::default().build_storage::<Test>().unwrap().into()
+	}
+
+	#[test]
+	fn it_works_for_default_value() {
+		with_externalities(&mut new_test_ext(), || {
+			// Just a dummy test for the dummy funtion `do_something`
+			// calling the `do_something` function with a value 42
+			assert_ok!(TemplateModule::do_something(Origin::signed(1), 42));
+			// asserting that the stored value is equal to what we stored
+			assert_eq!(TemplateModule::something(), Some(42));
+		});
+	}
+}
diff --git a/projects/lesson-7/scripts/init.sh b/projects/lesson-7/scripts/init.sh
new file mode 100644
index 0000000..cf5ecf9
--- /dev/null
+++ b/projects/lesson-7/scripts/init.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "*** Initializing WASM build environment"
+
+if [ -z $CI_PROJECT_NAME ] ; then
+   rustup update nightly
+   rustup update stable
+fi
+
+rustup target add wasm32-unknown-unknown --toolchain nightly
+
+# Install wasm-gc. It's useful for stripping slimming down wasm binaries.
+command -v wasm-gc || \
+	cargo +nightly install --git https://github.com/alexcrichton/wasm-gc --force
diff --git a/projects/lesson-7/scripts/restart.sh b/projects/lesson-7/scripts/restart.sh
new file mode 100644
index 0000000..42e69dc
--- /dev/null
+++ b/projects/lesson-7/scripts/restart.sh
@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+SKIP_WASM_BUILD= cargo check
+WASM_BUILD_TYPE=release cargo run -- purge-chain --dev -y
+WASM_BUILD_TYPE=release cargo run -- --dev
\ No newline at end of file
diff --git a/projects/lesson-7/src/chain_spec.rs b/projects/lesson-7/src/chain_spec.rs
new file mode 100644
index 0000000..a4ef17a
--- /dev/null
+++ b/projects/lesson-7/src/chain_spec.rs
@@ -0,0 +1,143 @@
+use primitives::{Pair, Public};
+use substrate_kitties_runtime::{
+	AccountId, BabeConfig, BalancesConfig, GenesisConfig, GrandpaConfig,
+	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, 
+};
+use babe_primitives::{AuthorityId as BabeId};
+use grandpa_primitives::{AuthorityId as GrandpaId};
+use substrate_service;
+
+// Note this is the URL for the telemetry server
+//const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
+
+/// Specialized `ChainSpec`. This is a specialization of the general Substrate ChainSpec type.
+pub type ChainSpec = substrate_service::ChainSpec<GenesisConfig>;
+
+/// The chain specification option. This is expected to come in from the CLI and
+/// is little more than one of a number of alternatives which can easily be converted
+/// from a string (`--chain=...`) into a `ChainSpec`.
+#[derive(Clone, Debug)]
+pub enum Alternative {
+	/// Whatever the current runtime is, with just Alice as an auth.
+	Development,
+	/// Whatever the current runtime is, with simple Alice/Bob auths.
+	LocalTestnet,
+}
+
+/// Helper function to generate a crypto pair from seed
+pub fn get_from_seed<TPublic: Public>(seed: &str) -> <TPublic::Pair as Pair>::Public {
+	TPublic::Pair::from_string(&format!("//{}", seed), None)
+		.expect("static values are valid; qed")
+		.public()
+}
+
+/// Helper function to generate stash, controller and session key from seed
+pub fn get_authority_keys_from_seed(seed: &str) -> (AccountId, AccountId, GrandpaId, BabeId) {
+	(
+		get_from_seed::<AccountId>(&format!("{}//stash", seed)),
+		get_from_seed::<AccountId>(seed),
+		get_from_seed::<GrandpaId>(seed),
+		get_from_seed::<BabeId>(seed),
+	)
+}
+
+impl Alternative {
+	/// Get an actual chain config from one of the alternatives.
+	pub(crate) fn load(self) -> Result<ChainSpec, String> {
+		Ok(match self {
+			Alternative::Development => ChainSpec::from_genesis(
+				"Development",
+				"dev",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+				],
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+			Alternative::LocalTestnet => ChainSpec::from_genesis(
+				"Local Testnet",
+				"local_testnet",
+				|| testnet_genesis(vec![
+					get_authority_keys_from_seed("Alice"),
+					get_authority_keys_from_seed("Bob"),
+				], 
+				get_from_seed::<AccountId>("Alice"),
+				vec![
+					get_from_seed::<AccountId>("Alice"),
+					get_from_seed::<AccountId>("Bob"),
+					get_from_seed::<AccountId>("Charlie"),
+					get_from_seed::<AccountId>("Dave"),
+					get_from_seed::<AccountId>("Eve"),
+					get_from_seed::<AccountId>("Ferdie"),
+					get_from_seed::<AccountId>("Alice//stash"),
+					get_from_seed::<AccountId>("Bob//stash"),
+					get_from_seed::<AccountId>("Charlie//stash"),
+					get_from_seed::<AccountId>("Dave//stash"),
+					get_from_seed::<AccountId>("Eve//stash"),
+					get_from_seed::<AccountId>("Ferdie//stash"),
+				],
+				true),
+				vec![],
+				None,
+				None,
+				None,
+				None
+			),
+		})
+	}
+
+	pub(crate) fn from(s: &str) -> Option<Self> {
+		match s {
+			"dev" => Some(Alternative::Development),
+			"" | "local" => Some(Alternative::LocalTestnet),
+			_ => None,
+		}
+	}
+}
+
+fn testnet_genesis(initial_authorities: Vec<(AccountId, AccountId, GrandpaId, BabeId)>,
+	root_key: AccountId, 
+	endowed_accounts: Vec<AccountId>,
+	_enable_println: bool) -> GenesisConfig {
+	GenesisConfig {
+		system: Some(SystemConfig {
+			code: WASM_BINARY.to_vec(),
+			changes_trie_config: Default::default(),
+		}),
+		indices: Some(IndicesConfig {
+			ids: endowed_accounts.clone(),
+		}),
+		balances: Some(BalancesConfig {
+			balances: endowed_accounts.iter().cloned().map(|k|(k, 1 << 60)).collect(),
+			vesting: vec![],
+		}),
+		sudo: Some(SudoConfig {
+			key: root_key,
+		}),
+		babe: Some(BabeConfig {
+			authorities: initial_authorities.iter().map(|x| (x.3.clone(), 1)).collect(),
+		}),
+		grandpa: Some(GrandpaConfig {
+			authorities: initial_authorities.iter().map(|x| (x.2.clone(), 1)).collect(),
+		}),
+	}
+}
diff --git a/projects/lesson-7/src/cli.rs b/projects/lesson-7/src/cli.rs
new file mode 100644
index 0000000..f6edbb2
--- /dev/null
+++ b/projects/lesson-7/src/cli.rs
@@ -0,0 +1,112 @@
+use crate::service;
+use futures::{future, Future, sync::oneshot};
+use std::cell::RefCell;
+use tokio::runtime::Runtime;
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+use substrate_cli::{informant, parse_and_prepare, ParseAndPrepare, NoCustom};
+use substrate_service::{AbstractService, Roles as ServiceRoles};
+use crate::chain_spec;
+use log::info;
+
+/// Parse command line arguments into service configuration.
+pub fn run<I, T, E>(args: I, exit: E, version: VersionInfo) -> error::Result<()> where
+	I: IntoIterator<Item = T>,
+	T: Into<std::ffi::OsString> + Clone,
+	E: IntoExit,
+{
+	match parse_and_prepare::<NoCustom, NoCustom, _>(&version, "substrate-node", args) {
+		ParseAndPrepare::Run(cmd) => cmd.run::<(), _, _, _, _>(load_spec, exit,
+		|exit, _cli_args, _custom_args, config| {
+			info!("{}", version.name);
+			info!("  version {}", config.full_version());
+			info!("  by {}, 2017, 2018", version.author);
+			info!("Chain specification: {}", config.chain_spec.name());
+			info!("Node name: {}", config.name);
+			info!("Roles: {:?}", config.roles);
+			let runtime = Runtime::new().map_err(|e| format!("{:?}", e))?;
+			match config.roles {
+				ServiceRoles::LIGHT => run_until_exit(
+					runtime,
+				 	service::new_light(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+				_ => run_until_exit(
+					runtime,
+					service::new_full(config).map_err(|e| format!("{:?}", e))?,
+					exit
+				),
+			}.map_err(|e| format!("{:?}", e))
+		}),
+		ParseAndPrepare::BuildSpec(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::ExportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::ImportBlocks(cmd) => cmd.run_with_builder::<(), _, _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec, exit),
+		ParseAndPrepare::PurgeChain(cmd) => cmd.run(load_spec),
+		ParseAndPrepare::RevertChain(cmd) => cmd.run_with_builder::<(), _, _, _, _>(|config|
+			Ok(new_full_start!(config).0), load_spec),
+		ParseAndPrepare::CustomCommand(_) => Ok(())
+	}?;
+
+	Ok(())
+}
+
+fn load_spec(id: &str) -> Result<Option<chain_spec::ChainSpec>, String> {
+	Ok(match chain_spec::Alternative::from(id) {
+		Some(spec) => Some(spec.load()?),
+		None => None,
+	})
+}
+
+fn run_until_exit<T, E>(
+	mut runtime: Runtime,
+	service: T,
+	e: E,
+) -> error::Result<()>
+where
+	T: AbstractService,
+	E: IntoExit,
+{
+	let (exit_send, exit) = exit_future::signal();
+
+	let informant = informant::build(&service);
+	runtime.executor().spawn(exit.until(informant).map(|_| ()));
+
+	// we eagerly drop the service so that the internal exit future is fired,
+	// but we need to keep holding a reference to the global telemetry guard
+	let _telemetry = service.telemetry();
+
+	let service_res = {
+		let exit = e.into_exit().map_err(|_| error::Error::Other("Exit future failed.".into()));
+		let service = service.map_err(|err| error::Error::Service(err));
+		let select = service.select(exit).map(|_| ()).map_err(|(err, _)| err);
+		runtime.block_on(select)
+	};
+
+	exit_send.fire();
+
+	// TODO [andre]: timeout this future #1318
+	let _ = runtime.shutdown_on_idle().wait();
+
+	service_res
+}
+
+// handles ctrl-c
+pub struct Exit;
+impl IntoExit for Exit {
+	type Exit = future::MapErr<oneshot::Receiver<()>, fn(oneshot::Canceled) -> ()>;
+	fn into_exit(self) -> Self::Exit {
+		// can't use signal directly here because CtrlC takes only `Fn`.
+		let (exit_send, exit) = oneshot::channel();
+
+		let exit_send_cell = RefCell::new(Some(exit_send));
+		ctrlc::set_handler(move || {
+			let exit_send = exit_send_cell.try_borrow_mut().expect("signal handler not reentrant; qed").take();
+			if let Some(exit_send) = exit_send {
+				exit_send.send(()).expect("Error sending exit notification");
+			}
+		}).expect("Error setting Ctrl-C handler");
+
+		exit.map_err(drop)
+	}
+}
diff --git a/projects/lesson-7/src/main.rs b/projects/lesson-7/src/main.rs
new file mode 100644
index 0000000..c7a227a
--- /dev/null
+++ b/projects/lesson-7/src/main.rs
@@ -0,0 +1,28 @@
+//! Substrate Node Template CLI library.
+
+#![warn(missing_docs)]
+#![warn(unused_extern_crates)]
+
+mod chain_spec;
+#[macro_use]
+mod service;
+mod cli;
+
+pub use substrate_cli::{VersionInfo, IntoExit, error};
+
+fn main() {
+	let version = VersionInfo {
+		name: "Substrate Node",
+		commit: env!("VERGEN_SHA_SHORT"),
+		version: env!("CARGO_PKG_VERSION"),
+		executable_name: "substrate-kitties",
+		author: "Bryan Chen",
+		description: "substrate-kitties",
+		support_url: "support.anonymous.an",
+	};
+
+	if let Err(e) = cli::run(::std::env::args(), cli::Exit, version) {
+		eprintln!("Fatal error: {}\n\n{:?}", e, e);
+		std::process::exit(1)
+	}
+}
diff --git a/projects/lesson-7/src/service.rs b/projects/lesson-7/src/service.rs
new file mode 100644
index 0000000..242cd9d
--- /dev/null
+++ b/projects/lesson-7/src/service.rs
@@ -0,0 +1,232 @@
+//! Service and ServiceFactory implementation. Specialized wrapper over substrate service.
+
+use std::sync::Arc;
+use std::time::Duration;
+use substrate_client::LongestChain;
+use babe::{import_queue, start_babe, Config};
+use grandpa::{self, FinalityProofProvider as GrandpaFinalityProofProvider};
+use futures::prelude::*;
+use substrate_kitties_runtime::{self, GenesisConfig, opaque::Block, RuntimeApi};
+use substrate_service::{error::{Error as ServiceError}, AbstractService, Configuration, ServiceBuilder};
+use transaction_pool::{self, txpool::{Pool as TransactionPool}};
+use inherents::InherentDataProviders;
+use network::construct_simple_protocol;
+use substrate_executor::native_executor_instance;
+pub use substrate_executor::NativeExecutor;
+
+// Our native executor instance.
+native_executor_instance!(
+	pub Executor,
+	substrate_kitties_runtime::api::dispatch,
+	substrate_kitties_runtime::native_version
+);
+
+construct_simple_protocol! {
+	/// Demo protocol attachment for substrate.
+	pub struct NodeProtocol where Block = Block { }
+}
+
+/// Starts a `ServiceBuilder` for a full service.
+///
+/// Use this macro if you don't actually need the full service, but just the builder in order to
+/// be able to perform chain operations.
+macro_rules! new_full_start {
+	($config:expr) => {{
+		let mut import_setup = None;
+		let inherent_data_providers = inherents::InherentDataProviders::new();
+		let mut tasks_to_spawn = None;
+
+		let builder = substrate_service::ServiceBuilder::new_full::<
+			substrate_kitties_runtime::opaque::Block, substrate_kitties_runtime::RuntimeApi, crate::service::Executor
+		>($config)?
+			.with_select_chain(|_config, backend| {
+				Ok(substrate_client::LongestChain::new(backend.clone()))
+			})?
+			.with_transaction_pool(|config, client|
+				Ok(transaction_pool::txpool::Pool::new(config, transaction_pool::ChainApi::new(client)))
+			)?
+			.with_import_queue(|_config, client, mut select_chain, transaction_pool| {
+				let select_chain = select_chain.take()
+					.ok_or_else(|| substrate_service::Error::SelectChainRequired)?;
+				let (block_import, link_half) =
+					grandpa::block_import::<_, _, _, substrate_kitties_runtime::RuntimeApi, _, _>(
+						client.clone(), client.clone(), select_chain
+					)?;
+				let justification_import = block_import.clone();
+
+				let (import_queue, babe_link, babe_block_import, pruning_task) = babe::import_queue(
+					babe::Config::get_or_compute(&*client)?,
+					block_import,
+					Some(Box::new(justification_import)),
+					None,
+					client.clone(),
+					client,
+					inherent_data_providers.clone(),
+					Some(transaction_pool)
+				)?;
+
+				import_setup = Some((babe_block_import.clone(), link_half, babe_link));
+				tasks_to_spawn = Some(vec![Box::new(pruning_task)]);
+
+				Ok(import_queue)
+			})?;
+
+		(builder, import_setup, inherent_data_providers, tasks_to_spawn)
+	}}
+}
+
+/// Builds a new service for a full client.
+pub fn new_full<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+
+	let is_authority = config.roles.is_authority();
+	let name = config.name.clone();
+	let disable_grandpa = config.disable_grandpa;
+	let force_authoring = config.force_authoring;
+
+	let (builder, mut import_setup, inherent_data_providers, mut tasks_to_spawn) = new_full_start!(config);
+
+	let service = builder.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()?;
+
+	let (block_import, link_half, babe_link) =
+		import_setup.take()
+			.expect("Link Half and Block Import are present for Full Services or setup failed before. qed");
+
+	// spawn any futures that were created in the previous setup steps
+	if let Some(tasks) = tasks_to_spawn.take() {
+		for task in tasks {
+			service.spawn_task(
+				task.select(service.on_exit())
+					.map(|_| ())
+					.map_err(|_| ())
+			);
+		}
+	}
+
+	if is_authority {
+		let proposer = basic_authorship::ProposerFactory {
+			client: service.client(),
+			transaction_pool: service.transaction_pool(),
+		};
+
+		let client = service.client();
+		let select_chain = service.select_chain()
+			.ok_or(ServiceError::SelectChainRequired)?;
+
+		let babe_config = babe::BabeParams {
+			config: Config::get_or_compute(&*client)?,
+			keystore: service.keystore(),
+			client,
+			select_chain,
+			block_import,
+			env: proposer,
+			sync_oracle: service.network(),
+			inherent_data_providers: inherent_data_providers.clone(),
+			force_authoring: force_authoring,
+			time_source: babe_link,
+		};
+
+		let babe = start_babe(babe_config)?;
+		let select = babe.select(service.on_exit()).then(|_| Ok(()));
+
+		// the BABE authoring task is considered infallible, i.e. if it
+		// fails we take down the service with it.
+		service.spawn_essential_task(select);
+	}
+
+	let grandpa_config = grandpa::Config {
+		// FIXME #1578 make this available through chainspec
+		gossip_duration: Duration::from_millis(333),
+		justification_period: 4096,
+		name: Some(name),
+		keystore: Some(service.keystore()),
+	};
+
+	match (is_authority, disable_grandpa) {
+		(false, false) => {
+			// start the lightweight GRANDPA observer
+			service.spawn_task(Box::new(grandpa::run_grandpa_observer(
+				grandpa_config,
+				link_half,
+				service.network(),
+				service.on_exit(),
+			)?));
+		},
+		(true, false) => {
+			// start the full GRANDPA voter
+			let voter_config = grandpa::GrandpaParams {
+				config: grandpa_config,
+				link: link_half,
+				network: service.network(),
+				inherent_data_providers: inherent_data_providers.clone(),
+				on_exit: service.on_exit(),
+				telemetry_on_connect: Some(service.telemetry_on_connect_stream()),
+			};
+
+			// the GRANDPA voter task is considered infallible, i.e.
+			// if it fails we take down the service with it.
+			service.spawn_essential_task(grandpa::run_grandpa_voter(voter_config)?);
+		},
+		(_, true) => {
+			grandpa::setup_disabled_grandpa(
+				service.client(),
+				&inherent_data_providers,
+				service.network(),
+			)?;
+		},
+	}
+
+	Ok(service)
+}
+
+/// Builds a new service for a light client.
+pub fn new_light<C: Send + Default + 'static>(config: Configuration<C, GenesisConfig>)
+	-> Result<impl AbstractService, ServiceError>
+{
+	let inherent_data_providers = InherentDataProviders::new();
+
+	ServiceBuilder::new_light::<Block, RuntimeApi, Executor>(config)?
+		.with_select_chain(|_config, backend| {
+			Ok(LongestChain::new(backend.clone()))
+		})?
+		.with_transaction_pool(|config, client|
+			Ok(TransactionPool::new(config, transaction_pool::ChainApi::new(client)))
+		)?
+		.with_import_queue_and_fprb(|_config, client, backend, _select_chain, transaction_pool| {
+			let fetch_checker = backend.blockchain().fetcher()
+				.upgrade()
+				.map(|fetcher| fetcher.checker().clone())
+				.ok_or_else(|| "Trying to start light import queue without active fetch checker")?;
+			let block_import = grandpa::light_block_import::<_, _, _, RuntimeApi, _>(
+				client.clone(), backend, Arc::new(fetch_checker), client.clone()
+			)?;
+
+			let finality_proof_import = block_import.clone();
+			let finality_proof_request_builder =
+				finality_proof_import.create_finality_proof_request_builder();
+
+			// FIXME: pruning task isn't started since light client doesn't do `AuthoritySetup`.
+			let (import_queue, ..) = import_queue(
+				Config::get_or_compute(&*client)?,
+				block_import,
+				None,
+				Some(Box::new(finality_proof_import)),
+				client.clone(),
+				client,
+				inherent_data_providers.clone(),
+				Some(transaction_pool)
+			)?;
+
+			Ok((import_queue, finality_proof_request_builder))
+		})?
+		.with_network_protocol(|_| Ok(NodeProtocol::new()))?
+		.with_finality_proof_provider(|client, backend|
+			Ok(Arc::new(GrandpaFinalityProofProvider::new(backend, client)) as _)
+		)?
+		.build()
+}
diff --git a/projects/lesson-7/tests/mod.rs b/projects/lesson-7/tests/mod.rs
new file mode 100644
index 0000000..e1948ff
--- /dev/null
+++ b/projects/lesson-7/tests/mod.rs
@@ -0,0 +1,105 @@
+use codec::{Compact, Encode};
+
+fn assert_encode<T: Encode>(t: T, bytes: &[u8]) {
+    let data = Encode::encode(&t);
+    assert_eq!(data, bytes);
+}
+
+#[derive(Encode)]
+enum TestEnum {
+    A,
+    B,
+    C = 10,
+}
+
+#[derive(Encode)]
+struct TestStruct {
+    a: TestEnum,
+    b: u32,
+    c: TestEnum,
+}
+
+#[derive(Encode)]
+enum TestEnum2 {
+    A(TestEnum, u32, TestEnum),
+    B(TestStruct),
+}
+
+#[test]
+fn test_codec() {
+    assert_encode(1u32, b"\x01\0\0\0");
+    assert_encode(1u64, b"\x01\0\0\0\0\0\0\0");
+
+    assert_encode(true, b"\x01");
+    assert_encode(false, b"\x00");
+
+    assert_encode(TestEnum::A, b"\x00");
+    assert_encode(TestEnum::B, b"\x01");
+    assert_encode(TestEnum::C, b"\x0a");
+
+    assert_encode((1u32, 2u32), b"\x01\0\0\0\x02\0\0\0");
+    assert_encode((TestEnum::A, 2u32, TestEnum::C), b"\0\x02\0\0\0\x0a");
+
+    assert_encode(
+        TestStruct {
+            a: TestEnum::A,
+            b: 2u32,
+            c: TestEnum::C,
+        },
+        b"\0\x02\0\0\0\x0a",
+    );
+
+    assert_encode(
+        TestEnum2::A(TestEnum::A, 2u32, TestEnum::C),
+        b"\0\0\x02\0\0\0\x0a",
+    );
+    assert_encode(
+        TestEnum2::B(TestStruct {
+            a: TestEnum::A,
+            b: 2u32,
+            c: TestEnum::C,
+        }),
+        b"\x01\0\x02\0\0\0\x0a",
+    );
+
+    assert_encode(Vec::<u8>::new(), b"\0");
+    assert_encode(vec![1u32, 2u32], b"\x08\x01\0\0\0\x02\0\0\0");
+}
+
+// compact encoding:
+// 0b00 00 00 00 / 00 00 00 00 / 00 00 00 00 / 00 00 00 00
+//   xx xx xx 00															(0 .. 2**6)		(u8)
+//   yL yL yL 01 / yH yH yH yL												(2**6 .. 2**14)	(u8, u16)  low LH high
+//   zL zL zL 10 / zM zM zM zL / zM zM zM zM / zH zH zH zM					(2**14 .. 2**30)	(u16, u32)  low LMMH high
+//   nn nn nn 11 [ / zz zz zz zz ]{4 + n}									(2**30 .. 2**536)	(u32, u64, u128, U256, U512, U520) straight LE-encoded
+
+// Note: we use *LOW BITS* of the LSB in LE encoding to encode the 2 bit key.
+
+#[test]
+fn test_compact() {
+    assert_encode(Compact(1u8), &[0b00000100]);
+    assert_encode(Compact(1u64), &[0b00000100]);
+    assert_encode(Compact(1u128), &[0b00000100]);
+
+    assert_encode(Compact(63u8), &[0b11111100]);
+    assert_encode(Compact(63u64), &[0b11111100]);
+    assert_encode(Compact(63u128), &[0b11111100]);
+
+    // 64
+    assert_encode(Compact(0b01000000u8), &[0b00000001, 0b00000001]);
+    assert_encode(Compact(0b01000000u64), &[0b00000001, 0b00000001]);
+    assert_encode(Compact(0b01000000u128), &[0b00000001, 0b00000001]);
+
+    // 65
+    assert_encode(Compact(0b01000001u8), &[0b00000101, 0b00000001]);
+    assert_encode(Compact(0b01000001u64), &[0b00000101, 0b00000001]);
+    assert_encode(Compact(0b01000001u128), &[0b00000101, 0b00000001]);
+
+    // 16383
+    assert_encode(Compact((1u64 << 14) - 1), &[0b11111101, 0b11111111]);
+    assert_encode(Compact((1u64 << 14) - 1), &[0b11111101, 0b11111111]);
+
+    // 16384
+    assert_encode(Compact(1u64 << 14), &[0b00000010, 0b00000000, 0b00000001, 0b00000000]);
+    assert_encode(Compact(1u64 << 14), &[0b00000010, 0b00000000, 0b00000001, 0b00000000]);
+}
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