0g-chain/x/evmutil/spec/03_messages.md

Messages

Users can submit various messages to the evmutil module which trigger state changes detailed below.

MsgConvertERC20ToCoin

MsgConvertCoinToERC20 converts a Kava ERC20 coin to sdk.Coin.

service Msg {
  // ConvertERC20ToCoin defines a method for converting Kava ERC20 to sdk.Coin.
  rpc ConvertERC20ToCoin(MsgConvertERC20ToCoin) returns (MsgConvertERC20ToCoinResponse);
}

// MsgConvertERC20ToCoin defines a conversion from Kava ERC20 to sdk.Coin.
message MsgConvertERC20ToCoin {
  // EVM 0x hex address initiating the conversion.
  string initiator = 1;
  // Kava bech32 address that will receive the converted sdk.Coin.
  string receiver = 2;
  // EVM 0x hex address of the ERC20 contract.
  string kava_erc20_address = 3;
  // ERC20 token amount to convert.
  string amount = 4 [
    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Int",
  ];
}

State Changes

• The EnabledConversionPairs param from x/evmutil is checked to ensure the conversion pair is enabled.
• The initiator's ERC20 token from kava_erc20_address is locked by transferring it from the initiator's 0x address to the x/evmutil module account's 0x address.
• The same amount of sdk.Coin are minted for the corresponding denom of the kava_erc20_address in the EnabledConversionPairs param. The coins are then transferred to the receiver's Kava address.

MsgConvertCoinToERC20

MsgConvertCoinToERC20 converts sdk.Coin to Kava ERC20.

service Msg {
  // ConvertCoinToERC20 defines a method for converting sdk.Coin to Kava ERC20.
  rpc ConvertCoinToERC20(MsgConvertCoinToERC20) returns (MsgConvertCoinToERC20Response);
}

// MsgConvertCoinToERC20 defines a conversion from sdk.Coin to Kava ERC20.
message MsgConvertCoinToERC20 {
  // Kava bech32 address initiating the conversion.
  string initiator = 1;
  // EVM 0x hex address that will receive the converted Kava ERC20 tokens.
  string receiver = 2;
  // Amount is the sdk.Coin amount to convert.
  cosmos.base.v1beta1.Coin amount = 3;
}

State Changes

• The EnabledConversionPairs param from x/evmutil is checked to ensure the conversion pair is enabled.
• The specified sdk.Coin is moved from the initiator's address to the module account and burned.
• The same amount of ERC20 coins are sent from the x/evmutil module account to the 0x receiver address.