Futchain - football datachain

Futchain is a sample Cosmos based blockchain with Ethereum Virtual Machine support. It aims to provide a real-time data source for smart contract based application while keeping the consensus of off-chain online data.

It is sample project to demonstrate bringing online real-time data to the blockchain while keeping stock CometBFT consensus.

Futchain is the blockchain infrastructure powering Bexdet, a decentralized sports betting platform.

Futchain keeps address 0x0000000000000000000000000000000000000807 associated with futchain module, for smart contract apps. The following sample Solidity code demonstrates how to use it.

pragma solidity >=0.8.17;

address constant FUTAPP_PRECOMPILE_ADDRESS = 0x0000000000000000000000000000000000000807;

struct MatchData {
    uint256 id;
    uint256 leagueId;
    string time;
    string minute;
    uint256 homeId;
    uint256 awayId;
    uint256 homeScore;
    uint256 awayScore;
    string homeName;
    string awayName;
    bool started;
    bool finished;
    bool cancelled;
}

struct LeagueData {
    uint256 id;
    string name;
    string groupName;
}

struct TeamData {
    uint256 id;
    string name;
}

interface FutI {
    function getMatch(uint256 matchId) external view returns (MatchData memory);
    function getLeague(uint256 leagueId) external view returns (LeagueData memory);
    function getTeam(uint256 teamId) external view returns (TeamData memory);
    function getUnfinishedMatches() external view returns (uint256[] memory);
}

FutI constant FUTCHAIN = FutI(FUTAPP_PRECOMPILE_ADDRESS);

Run the network

The following script will build and run a local node.

bash local_node.sh

Default account details are in the local_node.sh script.

RPC:         http://localhost:8545
CHAINID:     262144
COIN:        atest
VALIDATOR:   0x7cB61D4117AE31a12E393a1Cfa3BaC666481D02E

Technical Details

• Data source fetch will be triggered every 5 blocks.
• Data source is fetched for 2 days at a time.
• Uses Europe/Istanbul timezone for time synchronization.
• Has blind-update mechnism. The state will be updated whatever datasource gives.
• Flatbuffers for saving the data to the state.

Things to do

• Implemenet Government module to manage the data
• Implemenet Slashing module to ensure integration with futchain
• Data abstraction
• Multiple, user-defined data source support
• Ensure multiple validators can keep the same consensus over the data
• Ensure multiple validators can keep the same consensus over the data while using different data sources
• Support for multiple sport events.

Things to note

futchain is currently running with a single data source. This is that, it is not secure and no able to protect "decentralization" of the data, yet.