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-soliditygithub.com

Meson Smart Contracts