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README.md

What is FantasyGold?

FantasyGold serves the $7billion fantasy sports and $1.5billion esports industries as a decentralized blockchain project built on Bitcoin's UTXO model, with support for Ethereum Virtual Machine based smart contracts, and secured by a proof of stake consensus model. It achieves this through the revolutionary Account Abstraction Layer which allows the EVM to communicate with FantasyGold's Bitcoin-like UTXO blockchain.

For more general information about FantasyGold as well as links to join our community, go to https://fantasygold.io

Current Use Cases:

  1. Play Daily Fantasy Sports using FGC20 Tokens https://DraftDaily.com
  2. Play in eSports Tournaments using FGC20 Tokens https://FGCArena.com

This is the main network where the tokens hold value and should be guarded very carefully. If you are testing the network, or developing unstable software on FantasyGold, we highly recommend using either testnet or regtest mode.

The major features of the FantasyGold network include:

  1. Compatibility with the Ethereum Virtual Machine, which allows for compatibility with most existing Solidity based smart contracts. No special solidity compiler is required to deploy your smart contract to FantasyGold.
  2. A Proof of Stake consensus system which is optimized for FantasyGold's contract model. Any user can stake and help to secure the network. There is no voting, master nodes, or minimum amount required. There have been transactions as small as 2 FantasyGold that have created blocks in the past. Staking from smart contracts is under development.
  3. The Decentralized Governance Protocol is completely implemented and functional, which allows certain network parameters to be modified without a fork or other network disruption. This currently controls parameters like block size, gas prices, etc.
  4. Uses the UTXO transaction model and is compatible with Bitcoin, allowing for existing tooling and workflows to be used with FantasyGold. This allows for the infamous SPV protocol to be used which is ideal for light wallets on mobile phones and IoT devices.

Note: FantasyGold Core is considered beta software. We make no warranties or guarantees of its security or stability.

FantasyGold Documentation and Usage Resources

These are some resources that might be helpful in understanding FantasyGold. Note that the unofficial documents are not created by the FantasyGold team. Rscourses will be added to the list as development continues.

Basic usage resources:

  1. Deploying a token to FantasyGold (https://github.com/FantasyGold/FGC20Token/wiki/Basic-How-To)
  2. FantasyGold PlayBook - A Developer's Guide To FGC (Comming Soon)

Developer's Tools

What is FantasyGold Core?

FantasyGold Core is our primary mainnet wallet. It implements a full node and is capable of storing, validating, and distributing all history of the FantasyGold network. FantasyGold Core is considered the reference implementation for the FantasyGold network.

FantasyGold Core currently implements the following:

  • Sending/Receiving FantasyGold coins
  • Sending/Receiving FGC20 tokens on the FantasyGold network
  • Staking and creating blocks for the FantasyGold network
  • Creating and interacting with smart contracts
  • Running a full node for distributing the blockchain to other users
  • "Prune" mode, which minimizes disk usage
  • Regtest mode, which enables developers to very quickly build their own private FantasyGold network for Dapp testing
  • Testnet mode, using the public FantasyGold Testnet, with faucet available
  • Compatibility with the Bitcoin Core set of RPC commands and APIs
  • Full SegWit capability with p2sh-segwit (legacy) and bech32 (native) addresses

Alternative Wallets

FantasyGold Core uses a full node model, and thus requires downloading the entire blockchain. If you do not need the entire blockchain, and do not intend on developing smart contracts, it may be more ideal to use an alternative wallet such as one of our light wallets that can be synchronized in a matter of seconds.

FantasyGold Electrum

A light wallet that supports the Ledger and Trezor hardware wallets and is based on the well-known Electrum wallet software.

Download: (Coming Soon)

iOS and Android Wallets

iOS and Android Wallets (Coming Soon)

Android Download: https://github.com/FantasyGold/

iOS Download: https://github.com/FantasyGold/

Ledger Chrome Wallet

This light wallet runs in your Chrome browser as a browser extension. This wallet requires a Ledger device to use.

How to install: (Coming Soon)

Community Resources

Make sure to check out these resources as well for more information and to keep up to date with all the latest news about FantasyGold. At least 1 developer is always around, so if you're developing on FantasyGold and need help, we'd love to welcome you to our community.

FantasyGold Smart Contract Limitations

  • EVM smart contracts cannot receive coins from or send coins to any address type other than pay-to-pubkeyhash (starts with Q) addresses. This is due to a limitation in the EVM
  • Contracts are not allowed to create contracts with an initial endowment of coins. The contract must first be created, and then be sent coins in a separate transaction. Humans are also not allowed to create contracts with an initial endowment of coins.
  • Although all of the infrastructure is present, FantasyGold Core does not currently parse Solidity event data. You must parse this yourself using either searchlogs or -record-log-opcodes features.
  • It is not possible to send a contract coins without also executing the contract. This is also the case of Ethereum. This was promised in earlier discussions and technically does work, but due to lack of time for testing this feature was disabled. We hope to reenable this feature with release of the x86 virtual machine in 2020.
  • In FantasyGold there can be multiple addresses used to create a proof-of-stake block. However, the EVM can only see the first output using the coinbase operation in Solidity (this address is also the one registered for the continuous staker rewards after 500 blocks).

Building FantasyGold Core

Building FantasyGold Core

Validate and Reproduce Binaries

FantasyGold uses a tool called Gitian to make reproducible builds that can be verified by anyone. Instructions on setting up a Gitian VM and building FantasyGold are provided in Gitan Building

Build on Ubuntu

This is a quick start script for compiling FantasyGold on  Ubuntu


sudo apt-get install build-essential libtool autotools-dev automake pkg-config libssl-dev libevent-dev bsdmainutils git cmake libboost-all-dev libgmp3-dev
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:bitcoin/bitcoin
sudo apt-get update
sudo apt-get install libdb4.8-dev libdb4.8++-dev

#If you want to build the Qt GUI:
sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev protobuf-compiler qrencode

git clone https://github.com/FantasyGold/FantasyGold-Core --recursive
cd fantasygold

#Note autogen will prompt to install some more dependencies if needed
./autogen.sh
./configure 
make -j2

Build on CentOS

Here is a brief description for compiling FantasyGold on CentOS, for more details please refer to the specific document

#Compiling boost manually
sudo yum install python-devel bzip2-devel
git clone https://github.com/boostorg/boost.git
cd boost
git checkout boost-1.66.0
git submodule update --init --recursive
./bootstrap.sh --prefix=/usr --libdir=/usr/lib64
./b2 headers
sudo ./b2 -j4 install

#Installing Dependencies for FantasyGold
sudo yum install epel-release
sudo yum install libtool libdb4-cxx-devel openssl-devel libevent-devel gmp-devel

#If you want to build the Qt GUI:
sudo yum install qt5-qttools-devel protobuf-devel qrencode-devel

# Building FantasyGold
git clone --recursive https://github.com/FantasyGold/FantasyGold-Core.git
cd fantasygold
./autogen.sh
./configure
make -j4

Build on Mac OS

The commands in this guide should be executed in a Terminal application. The built-in one is located in /Applications/Utilities/Terminal.app.

Preparation

Install the Mac OS command line tools:

xcode-select --install

When the popup appears, click Install.

Then install Homebrew.

Dependencies

brew install cmake automake berkeley-db4 libtool boost miniupnpc openssl pkg-config protobuf qt5 libevent imagemagick librsvg qrencode gmp

NOTE: Building with Qt4 is still supported, however, could result in a broken UI. Building with Qt5 is recommended.

Build FantasyGold Core

  1. Clone the fantasygold source code and cd into fantasygold

     git clone --recursive https://github.com/FantasyGold/FantasyGold-Core.git
     cd fantasygold
    
  2. Build fantasygold-core:

    Configure and build the headless fantasygold binaries as well as the GUI (if Qt is found).

    You can disable the GUI build by passing --without-gui to configure.

    ./autogen.sh
    ./configure
    make
    
  3. It is recommended to build and run the unit tests:

    make check
    

Run

Then you can either run the command-line daemon using src/fantasygoldd and src/fantasygold-cli, or you can run the Qt GUI using src/qt/fantasygold-qt

License

FantasyGold is GPLv3 licensed.

Development Process

The master branch is regularly built and tested, but is not guaranteed to be completely stable. Tags are created regularly to indicate new official, stable release versions of FantasyGold.

The contribution workflow is described in CONTRIBUTING.md.

Developer Chat can be found on Discord

Testing

Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.

Automated Testing

Developers are strongly encouraged to write unit tests for new code, and to submit new unit tests for old code. Unit tests can be compiled and run (assuming they weren't disabled in configure) with: make check. Further details on running and extending unit tests can be found in /src/test/README.md.

There are also regression and integration tests, written in Python, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

Manual Quality Assurance (QA) Testing

Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.