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Meson in Solidity
We have implemented the Meson protocol with Solidity smart contracts, and deployed to the following EVM-compatible public chains:
  • Ethereum
  • BNB Chain (formerly BSC)
  • Polygon
  • Evmos Mainnet
  • Arbitrum
  • Optimism
  • Aurora (on NEAR)
  • Conflux eSpace
  • Avalanche C-chain
  • Fantom
  • Tron
  • Harmony
  • Moonriver
  • Moonbeam

Chain-specific System Invariates

The chain-specific invariants are given in the MesonConfig.sol file. The compile and deploy script will automatically set this config file.
  • SHORT_COIN_TYPE (uint16): The identifier of the chain. We use the last 2 bytes of SLIP-44 as the unique ID of a chain:
    Chain
    Short Coin Type
    Ethereum
    0x003c
    Tron
    0x00c3
    Conflux
    0x01f7
    Optimism
    0x0266
    BNB Chain
    0x02ca
    Polygon
    0x03c6
    Fantom
    0x03ef
    Harmony
    0x03ff
    Moonbeam
    0x0504
    Moonriver
    0x0505
    Aurora
    0x0a0a
    Evmos
    0x11bc
    Avalanche
    0x2328
    Arbitrum
    0x2329
  • MIN_BOND_TIME_PERIOD (uint256) & MAX_BOND_TIME_PERIOD (uint256): The minimal and maximum expire time when bonding a swap, set to 1 hour and 2 hours, respectively. The swap encoding will include a timestamp expireTs before which the user's assets will be locked on the initial chain. The LP should call executeSwap before expireTs to take away the swapping fund. The expireTs needs to satisfy ts_bonded_tx + MIN_BOND_TIME_PERIOD < expireTs < ts_bonded_tx + MAX_BOND_TIME_PERIOD, where ts_bonded_tx is the block time for the executed postSwap transaction.
  • LOCK_TIME_PERIOD (uint256): The time length when an LP locks a swap, sets to 40 minutes. The initiator should sign the release signature to get swapped assets on the target chain before the time ts_locked_tx + LOCK_TIME_PERIOD, where ts_locked_tx is the block time for the executed lock transaction.
  • REQUEST_TYPE_HASH (bytes32): Equals to keccak256(bytes32 "Sign to request a swap on Meson") or keccak256(bytes32 "Sign to request a swap on Meson (Testnet)"). It's used when checking the request signature.
  • RELEASE_TYPE_HASH (bytes32): Equals to keccak256(bytes32 "Sign to release a swap on Meson" + bytes32 [Recipient]) or keccak256(bytes32 "Sign to release a swap on Meson (Testnet)" + bytes32 "[Recipient]"). It's used when checking the release signature.

Source Code

https://github.com/MesonFi/meson-contracts-solidity
github.com
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Chain-specific System Invariates
Source Code