sol-playground

A playground for writing, compiling, testing smart contracts on Solana chain(s): Mainnet, Testnet, Devnet.

About

• Anchor lang for writing smart contracts on Solana.
  • Rust eDSL for writing safe, secure, and high level Solana programs
• IDL ~ ABI

Installation

The following is for macOS M1 & also for Lima VM run on top of macOS M1.

• Issue for macOS M1: not able to run solana-test-validator. Solved via Troubleshoot #3.
• Issue for lima VM: Still unsuccessful with solana installation. Tried with source. getting this error: No package 'libudev' found (TODO: fix this)

Rust

macOS M1 ✅ | lima VM ✅

Follow this

Solana

macOS M1 ✅ | lima VM

Learn Solana concepts

This is for compiling solana contracts/programs.

M-1: Install using brew

Install/Update using brew

$ brew install solana

update solana-install

❯ solana-install update
Install is up to date. 1.10.40 is the latest compatible release

❯ solana --version
solana-cli 1.13.4 (src:devbuild; feat:4011803773)

Here, the problem is that the solana-test-validator fails on console. Hence, it is recommended to install using source via following Troubleshooting #3.

---

Uninstall:

$ brew uninstall solana

M-2: Install using binaries [RECOMMENDED]

SOURCE

1. Download specific version's binaries with name: solana-release-aarch64-apple-darwin.tar.bz2 from releases page into home directory i.e. ~

2. Then, extract the folder via double-click the folder, into home directory. While writing this doc, it's 1.13.3 version.

3. Now, rename the folder from solana-releases to solana-1.13.3. No need to cargo build as it's already built. Just link the binaries to PATH.

4. Add the following to ~/.zprofile:

   export PATH="$HOME/solana-1.13.3/bin:$PATH"

5. Activate the changes:

   $ source ~/.zprofile

6. Check the version:

   In case of access denied to the binary CLI command execution, just go to Finder App & right click on the binary file & click on Open With Terminal option. Then, it will ask for the permission to execute the binary file. Click on Open option & then it will work.

   ❯ solana -V
    solana-cli 1.13.3 (src:3271b83d; feat:4011803773)

7. Check for solana-test-validator if running properly:

   ❯ solana-test-validator

   If you get this error: Error: 1:19521 Illegal hardware instruction (core dumped), then follow Troubleshooting #3.

---

In case of any update, if needed just follow the steps from #1 to #6. Don't follow $ solana-install update as it's meaningless.

# I am using 1.13.3 version already. So, it's not updating.
❯ solana-install update
Install is up to date. 1.10.40 is the latest compatible release

NodeJS

macOS M1 ✅ | lima VM ✅

This is for writing unit tests using Javascript or Typescript.

• nvm
• node
• npm
• yarn

Check the installation steps here.

Anchor

macOS M1 ✅ | lima VM ✅

This is similar to Hardhat/Truffle/Foundry/Brownie (for EVM contracts). Know more

Don't follow npm to install anchor-cli i.e. don't use this command: $ npm install -g @project-serum/anchor-cli on macOS. Otherwise you will get this error:

❯ anchor
Only x86_64 / Linux distributed in NPM package right now.
Trying globally installed anchor.

Following is true for both macOS & linux VM like lima.

Hence, install using avm. Anchor version manager (avm) is a tool for using multiple versions of the anchor-cli.

It's better to use avm to manage multiple versions of Anchor.

$ cargo install --git https://github.com/coral-xyz/anchor avm --locked --force

To use latest version, try this:

$ avm install latest
$ avm use latest

OR

avm update

---

In case of any issue for Ubuntu, do this first:

$ sudo apt-get update && sudo apt-get upgrade && sudo apt-get install -y pkg-config build-essential libudev-dev libssl-dev

CLI

Getting started

1. Start a project $ anchor init hello-solana

2. write the code in src/lib.rs & add supported files

   • constant.rs
   • error.rs
   • states.rs

3. Build: $ anchor build

4. Get the program address during build: $ solana address -k <KEYPAIR-FILE-PATH> e.g. $ solana address -k target/deploy/hello_solana-keypair.json

    ❯ solana address -k target/deploy/hello_solana-keypair.json                                     ⏎
    BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD

5. Now, add the address into Anchor.toml file & also in src/lib.rs in declare_id!() macro.

6. Check sufficient SOL/lamports in the deployer (default keypair is ~/.config/solana/id.json) account: $ solana balance:

   • If not, then fund the account: $ solana airdrop 1, for localnet it's not needed though.
   • Check balance again: $ solana balance

    ❯ solana balance                                                                                ⏎
    500000000 SOL

7. For localnet (ensure $ solana config get -> connected to localnet), deploy: $ anchor deploy or $ solana program deploy target/deploy/hello_world-keypair.json

   Run solana-test-validator in another terminal.

   Using anchor-cli:

   ❯ anchor deploy                                                  ⏎
   Deploying workspace: http://localhost:8899
   Upgrade authority: /Users/abhi3700/.config/solana/id.json
   Deploying program "hello-solana"...
   Program path: /Users/abhi3700/F/coding/github_repos/sol-playground/sc/hello-solana/target/deploy/hello_solana.so...
   Program Id: BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD

   OR

   Using solana-cli:

   ❯ solana program deploy target/deploy/hello_solana.so                                           ⏎
   Program Id: BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD

   View the program details:

   ❯ solana program show BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD
   
   Program Id: BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD
   Owner: BPFLoaderUpgradeab1e11111111111111111111111
   ProgramData Address: DR6WL7PQRepVzw7q772gZ9tf8CQGmhcrc8BX2vfgabyp
   Authority: HTeVsf7bg3EuAKKpg74p4soHVoxJAYCSmK2PBJZt8Dyu
   Last Deployed In Slot: 87
   Data Length: 356368 (0x57010) bytes
   Balance: 2.48152536 SOL

8. Test: $ anchor test

9. Upgrade (if required).

   ❯ solana program deploy target/deploy/hello_solana.so
   Program Id: BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD

   View the program details:

   ❯ solana program show BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD
   
    Program Id: BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD
    Owner: BPFLoaderUpgradeab1e11111111111111111111111
    ProgramData Address: DR6WL7PQRepVzw7q772gZ9tf8CQGmhcrc8BX2vfgabyp
    Authority: HTeVsf7bg3EuAKKpg74p4soHVoxJAYCSmK2PBJZt8Dyu
    Last Deployed In Slot: 8360
    Data Length: 356368 (0x57010) bytes
    Balance: 2.48152536 SOL

---

• Greeting contract
• About: It's a simple program, all it does is increment a number every time it's called.
• Here, fetch the greeting account's counter attribute >> increment by 1 >> store it back >> log the stored value

Coding

• Serializer/Deserializer: Bosch (also used in Near blockchain).

Program

• In Solana native rust code, we have to parse program_id as argument:

  fn process_instruction(
      program_id: &Pubkey,
      accounts: &[AccountInfo],
      _instruction_data: &[u8]
  ) -> ProgramResult {
      let accounts_iter = &mut accounts.iter();
  
      // The account that signs the transaction and pays for it
      let payer_account = next_account_info(accounts_iter)?;
  
      // The account in which we store the counter
      let counter_account = next_account_info(accounts_iter)?;
  
      if counter_account.owner != program_id {
          msg!("Counter account does not have the correct program id");
          return Err(ProgramError::IncorrectProgramId);
      }
  
      let mut counter_data = counter_account.try_borrow_mut_data()?;
      let mut counter = u32::from_le_bytes([counter_data[0], counter_data[1], counter_data[2], counter_data[3]]);
      counter += 1;
      counter_data[0..4].copy_from_slice(&counter.to_le_bytes());
  
      msg!("Incremented counter to {}", counter);
  
      Ok(())
  }

  Code explanation:

  In this code, we first get the payer account and then the counter account from the accounts slice. We then check if the counter account has the correct owner, which should be the program id of the current program. If it does not, we return an error.

  Next, we borrow the counter account's data mutably and interpret the first four bytes as a u32 integer, which is our counter. We increment the counter and then write its new value back to the counter account's data.

  To interact with this program, you would need to create a new account with this program's id as the owner and pass this account to the program as the second account in the accounts slice. You would also need to sign the transaction with the payer account, which is the first account in the accounts slice.

  This is a very basic example and does not include error handling or checks for the payer account. In a real-world scenario, you would want to include checks to ensure that the payer account has enough SOL to pay for the transaction and that the counter account has enough space for the counter.

  Here, the program_id is parsed to check with the data account owner (index: 1 i.e. accounts[1]).

  So, we won't get the address from within the function as the code is not deployed yet when the code was being written.

  Also there is no way to get the caller's address unlike msg.sender in Solidity . We have to parse even that address (payer's address) as argument.

  As per the Solana program architecture, the program & data sits at 2 different accounts. Hence, we need to validate the program_id with data_account.owner so that the function can execute its logic & then we can then store the data (if we want to) into the data account.

• the account variable can only be edited if the account's owner public key matches with the program_id

if (account.owner == program_id) {
//the variable can be edited.
}

To detect whether an address is a program, just check the account info (fetched from outside the SC) is not NULL or check if the program_id has is_executable as true (can be done from inside/outside the SC).

• When we write a program, we should add function/instruction & then corresponding Account (in form of struct) & then test.

• Add #[program] attribute to the mod, which contains all the functions/instruction

• The prelude contains all commonly used components of the crate. All programs should include it via anchor_lang::prelude::*;

• Get program id from inside the code:

   msg!("The Program id: {}", crate::ID);

Function

Every function usually comes with a struct like this:

L-10:14 & L-18: shows that.

Event

The #[event] attributed event can be defined like this:

#[event]
pub struct Transfer {
    #[index]
    pub from: Pubkey,
    #[index]
    pub to: Pubkey,
    pub amount: u128,
}

Error

• #[error] attribute is used to define custom errors like this:

  #[error_code]
  pub enum TodoError {
     #[msg("You are not authorized to perform this action.")]
     Unauthorized,
     #[msg("Not allowed")]
     NotAllowed,
     #[msg("Math operation overflow")]
     MathOverflow,
     #[msg("Already marked")]
     AlreadyMarked,
  }

Mapping

In solidity, if we would have written like this:

struct Todo {
   string content;
   bool marked;
}

mapping(address => Todo[]) public todos;

Unlike solidity, we can't use mapping in case of Solana, but rather we use the authority pattern like this:

#[account]
#[derive(Default)]
pub struct UserProfile {
   pub authority: Pubkey,
   pub last_todo: u8,
   pub todo_count: u8,
}

#[account]
#[derive(Default)]
pub struct TodoAccount {
   pub authority: Pubkey,
   pub idx: u8,
   pub content: String,
   pub marked: bool,
}

Imagine a person maintaining TODOs on Solana, the architecture would be like this:

Here, a person would have 1 yellow colored account (todo tracker) & multiple orange colored accounts (todo item) for different TODOs.

Here, in mass, each person would have 1 yellow colored account (todo tracker) & multiple orange colored accounts (todo item) for different TODOs.

Space & Rent

One can get the struct (#[account]) properties size by doing manually via referring this

#[derive(Accounts)]
pub struct InitializeUser<'info> {
    #[account(mut)]
    authority: Signer<'info>,

    #[account(
        init,
        seeds = [USER_TAG, authority.key().as_ref()],
        bump,
        payer = authority,
        // 8 (First 8 bytes are default account discriminator) + max_size(UserProfile)
        space = 8 + std::mem::size_of::<UserProfile>()
    )]
    pub user_profile: Box<Account<'info, UserProfile>>,
    pub system_program: Program<'info, System>, // it's needed
}

Log

All the logs can be viewed in .anchor/ folder created during $ anchor test command like this:

Streaming transaction logs mentioning BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD. Confirmed commitment
Transaction executed in slot 3:
  Signature: 66UGGJsbWAfuHhdWgvdHYVg4D6HsdhacEMVEzcAvy14qmb9vxwsGZoAdkrf6ogi2p8XZkAVHNf4jAA1XfuN99Q4w
  Status: Ok
  Log Messages:
    Program BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD invoke [1]
    Program log: Instruction: Initialize
    Program 11111111111111111111111111111111 invoke [2]
    Program 11111111111111111111111111111111 success
    Program 11111111111111111111111111111111 invoke [2]
    Program 11111111111111111111111111111111 success
    Program log: The Program id: BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD
    Program BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD consumed 21006 of 200000 compute units
    Program BTc32GfyocV5yZvSqvLvyefkLftyHfG92Sxao2KaLqiD success

for the Solana program instruction defined like this:

   pub fn initialize(ctx: Context<Initialize>, new_name: String) -> Result<()> {
      let my_data = &mut ctx.accounts.data;
      my_data.name = new_name;

      msg!("The Program id: {}", crate::ID);
      Ok(())
   }

Test

• A program's instruction (defined in snake_case) like send_tweet is converted into camelCase like sendTweet in the test file, like this:

  it("Send tweet", async () => {
    await program.rpc.sendTweet();
  });

SC Security

• Owner check
• Owner signer
• Tool: Soteria source

Tools

• Gelato (transaction scheduling) like tool: Clockwork

  Developers can use Clockwork to schedule transactions and automate smart-contracts without relying on centralized infrastructure. This allows developers to build more complex and robust applications on Solana.

• Remix like IDE for Solana - https://beta.solpg.io/

Troubleshoot

1. Error: Balance unchanged

• Cause: This is because of exceeding 5 tokens as airdrop.
• Solution: try <=5 tokens as airdrop $ solana airdrop 5

2. Error: Account 4aUirUHybwAmuEJPorfeWeWNk4nTgujAkPo2aodNvTv6 has insufficient funds for spend (1.21953816 SOL) + fee (0.000885 SOL)

• Cause: This is because of insufficient fund in the program deployer account.
• Solution:Airdrop some tokens (a min. of 1.22042316 SOL) $ solana airdrop 5 4aUirUHybwAmuEJPorfeWeWNk4nTgujAkPo2aodNvTv6 or $ solana airdrop 5

3. Error: [1] 19521 illegal hardware instruction solana-test-validator

• Cause: This happens on Mac M1 processor

• Solution: Uninstall Solana, Rust & then install from scratch using the following steps shown here

  1. Make sure that "Open using Rosetta" is disabled in the terminal
     • Open Finder & search for "Terminal"
     • Right click on "Terminal" App & click "Get info"
     • Ensure that the "Open using Rosetta" option is diabled.
  2. Uninstall Solana: $ rm -rf /Users/abhi3700/.local/share/solana/
  3. Uninstall Rust: $ rustup self uninstall
  4. Setup Rosetta: $ /usr/sbin/softwareupdate --install-rosetta --agree-to-license
     • Now, we will create duplicate copy of "Terminal" App (search in finder)
     • Name it as "Terminal Rosetta"
     • Make sure the "Open using Rosetta" option is enabled.
  5. Now, use "Terminal Rosetta" from hereon. [OPTIONAL] Make the background color to something else by clicking cmd+i on opened terminal to make it look different.
  6. Install Rust, Cargo: $ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
  7. Install Homebrew using the x86 instruction set. Note the prefix used arch -x86_64: $ arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
  8. Also install OpenSSL in x86 instruction set, but get error like this:

  // install openssl inside intel processor
  $ arch -x86_64 brew install openssl@1.1
  Error: Cannot install under Rosetta 2 in ARM default prefix (/opt/homebrew)!
  To rerun under ARM use:
    arch -arm64 brew install ...
  To install under x86_64, install Homebrew into /usr/local.

Then tried doing under ARM and it was success.

$ arch -arm64 brew install openssl@1.1

9. Create a new file via $ touch ~/.cargo/config and copy paste this:

[target.x86_64-apple-darwin]
rustflags = [
  "-C", "link-arg=-undefined",
  "-C", "link-arg=dynamic_lookup",
]

[target.aarch64-apple-darwin]
rustflags = [
  "-C", "link-arg=-undefined",
  "-C", "link-arg=dynamic_lookup",
]

10. [For UPDATE, start from this step] Now, clone solana from source via $ git clone https://github.com/solana-labs/solana.git. NOTE: Do it in the home directory & then won't be deleted by mistake.
    • first download the solana-release-aarch64-apple-darwin.tar.bz2 file from here into home directory i.e. /Users/abhi3700/
    • Then, extract the folder via double-click into home directory. While writing, it's 1.13.3 version.
    • Now, get solana-1.14.7 folder from solana-1.14.7.tar.gz. You can delete the tar.gz file.
    • More to the folder: $ cd solana-1.14.7
11. Build

$ cargo build

12. Install coreutils

$ arch -arm64 brew install coreutils

13. Install script to generate binaries into ./bin folder. (takes 1123 seconds)

$ ./scripts/cargo-install-all.sh .

14. Add the binaries folder into the PATH.

    Skip step #11 to #13 if already available with binary. In case of access denied to the binary CLI command execution, just go to Finder App & right click on the binary file & click on Open With Terminal option. Then, it will ask for the permission to execute the binary file. Click on Open option & then it will work.

// open .zprofile in VSC editor
$ code ~/.zprofile

// Add this line to EOL
export PATH="/Users/abhi3700/solana-1.14.7"/bin:"$PATH"

// activate command
$ source ~/.zprofile

NOTE: For multiple versions just open ~/.zprofile file & change the version via commenting the previous version. Also, make sure that the path exist. Hence, it looks like this:

# export PATH="/Users/abhi3700/solana-1.8.0"/bin:"$PATH"
# export PATH="/Users/abhi3700/solana-1.8.5"/bin:"$PATH"
# export PATH="/Users/abhi3700/solana-1.9.4"/bin:"$PATH"
export PATH="/Users/abhi3700/solana-1.14.7"/bin:"$PATH"

1. Run the commands like solana, solana-test-validator. NOTE: all the blocks will be stored in test-ledger/ [Better to delete after the localnet running is done]. To shutdown this, press ctrl+c and then restart from the stopped block.

❯ solana-test-validator                                                       ⏎
Ledger location: test-ledger
Log: test-ledger/validator.log
Identity: 3RvvwAbhmFDeF8n9SgMKKTyphDev3s9Gx6mefR65o19N
Genesis Hash: DrFFgvyNjJXgfRBgPDcTgQ7WmyFE2BkX1aRK5s8twrod
Version: 1.14.7
Shred Version: 62237
Gossip Address: 127.0.0.1:1024
TPU Address: 127.0.0.1:1027
JSON RPC URL: http://127.0.0.1:8899
⠄ 00:00:10 | Processed Slot: 19 | Confirmed Slot: 19 | Finalized Slot: 0 | Snaps

16. Now, during Anchor build might occur an issue related to bpf folder does not exist as the solana has been installed from source. So, follow "Error-4" for doing the additional step of copying sdk/bpf/ folder into ~/.cargo/bin/.

4. Error: BPF SDK path does not exist: /Users/abhi3700/.cargo/bin/sdk/bpf: No such file or directory (os error 2)

• Cause: This happens during $ anchor build. This error occurs as the solana has been installed from source.
• Solution: Just copy ~/solana-1.14.7/bin/sdk to here: ~/.cargo/bin/. Note: there might be sdk shortcut. Just replace this with the sdk folder containing bpf/. Then it would build successfully.

5. Program deployment error:

• Error:

Error: Custom: Invalid blockhash
There was a problem deploying: Output { status: ExitStatus(unix_wait_status(256)), stdout: "", stderr: "" }.

• Cause:
  • It could be due to solana-cli conflict.
  • It could be because the new program_id generated into target/deploy/ is put into the declare_id, Anchor.toml.
• Solution: Check the 2 things above.
  • try with solana-1.8.0, if not working with solana-1.9.4,

solana-cli 1.8.0 (src:4a8ff62a; feat:1813598585)
anchor-cli 0.20.1
rustc 1.57.0 (f1edd0429 2021-11-29)

6. Error: failed to get recent blockhash: FetchError: request to http://localhost:8899/ failed, reason: connect ECONNREFUSED 127.0.0.1:8899

• Cause: This happens when the solana-test-validator is not running during the anchor run test.

  This is because of usage of anchor.setProvider(anchor.AnchorProvider.env()); in the test.ts file.

• Solution: Just run the solana-test-validator in another terminal & then run the anchor run test.

7. Error: failed to send transaction: Transaction simulation failed: Attempt to load a program that does not exist

• Cause: This happens when the solana-test-validator is running & the program is not loaded/deployed.
• Solution: Just run the anchor deploy (change Anchor.toml, src/lib.rs) & then run the anchor run test.

8. Error: AnchorError occurred. Error Code: DeclaredProgramIdMismatch. Error Number: 4100. Error Message: The declared program id does not match the actual program id.

• Cause: This happens when the program_id generated into target/deploy/ is not put into the declare_id, Anchor.toml.
• Solution: Just copy the program_id from target/deploy/ & put it into the declare_id, Anchor.toml. & re-deploy after starting the ledger from fresh solana-test-validator --reset.

Also, check the available program id:

anchor keys list

9. Error: Invalid arguments: tweet (account) not provided

• Cause: This happens when the tweet account is not provided with account constraint in the src/lib.rs file.
• Solution: Just add the tweet account with account constraint in the src/lib.rs file.

Before:

#[derive(Accounts)]
pub struct SendTweet<'info> {
    pub tweet: Account<'info, Tweet>,
    pub author: Signer<'info>,
    pub system_program: Program<'info, System>,
}

After:

#[derive(Accounts)]
pub struct SendTweet<'info> {
    #[account(init, payer = author, space=Tweet::LEN)]
    pub tweet: Account<'info, Tweet>,
    #[account(mut)]
    pub author: Signer<'info>,
    pub system_program: Program<'info, System>,
}

10. error: the payer specified does not exist.

• Cause: This happens when the payer account is not provided with account constraint in the src/lib.rs file. Basically, the trial was to make the contract as payer.

  #[derive(Accounts)]
  pub struct Initialize<'info> {
      #[account(init, payer = crate::ID, space= 8+4+200)]
      data: Account<'info, MyData>,
      // #[account(mut)]
      author: Signer<'info>,
      system_program: Program<'info, System>,
  }

• Solution: Instead add the author (EOA) account with account constraint in the src/lib.rs file, but not a program account.

  #[derive(Accounts)]
  pub struct Initialize<'info> {
      #[account(init, payer = author, space= 8+4+200)]
      data: Account<'info, MyData>,
      #[account(mut)]
      author: Signer<'info>,
      system_program: Program<'info, System>,
  }

Resources

• Solana Wiki, comparison to Ethereum
• Solana vs Ethereum account
• Solana Cookbook
• Anchor - Solana Smart Contract Framework
• Anchor Book
• Solana internals Part 1: what are the native on-chain programs and why do they matter?
• Get started with Anchor
• Build Solana Anchor Blog with Svelte Front end Tutorial - Part 1 (Rust)
• Solana Tutorial | Solana for Developers
• Building SmartContracts With #Solana and #Rust
• The Complete Guide to Full Stack Solana Development with React, Anchor, Rust, and Phantom
• Learning How to Build on Solana
• ok so what the fuck is the deal with solana anyway
• Solana Development Tutorial: Key Concepts
• Solana Transactions in Depth
• SOL dev
  • Tutorials
  • Articles
  • Projects
  • Scaffolds

    Build Dapps on Solana with these templates

  • Tools
• NFT Developer Studio for Solana
• Program library | by Solana-labs

Tutorials

• Create a Solana dApp from scratch best

  Using anchor lang/framework

• By Figment
• Solana Tutorial: Creating PDA's with Anchor
• Solana 101:
  • Introduction
  • Setup the project
  • Connect to the Solana Devnet
  • Create a Keypair
  • Fund the account
  • Check the account balance
  • Transfer SOL tokens
  • Deploy a program
  • Create a Greeter account
  • Get Greetings' count
  • Send Greetings
• Solana transactions per second: how to with Rust
• Solana wallet with Rust: get started now

Courses

• Github repo

Security

• Security
• From Ethereum smart contracts to Solana programs: two common security pitfalls and beyond
• Solana Smart Contracts: Common Pitfalls and How to Avoid Them
• Soteria — A vulnerability scanner for Solana smart contracts

Videos

• YT playlist
• Solana Tutorial: Creating PDA's with Anchor