0g-chain/x/evmutil/spec/02_state.md

State

Parameters and Genesis State

Parameters define the list of conversion pairs allowed to be converted between Kava ERC20 tokens & sdk.Coins, and the list of native cosmos sdk.Coins that are allowed to be converted to ERC20s.

// Params defines the evmutil module params
message Params {
  // enabled_conversion_pairs defines the list of conversion pairs allowed to be
  // converted between Kava ERC20 and sdk.Coin
  repeated ConversionPair enabled_conversion_pairs = 4;

  // allowed_cosmos_denoms is a list of denom & erc20 token metadata pairs.
  // if a denom is in the list, it is allowed to be converted to an erc20 in the evm.
  repeated AllowedCosmosCoinERC20Token allowed_cosmos_denoms = 1;
}

// ConversionPair defines a Kava ERC20 address and corresponding denom that is
// allowed to be converted between ERC20 and sdk.Coin
message ConversionPair {
  // ERC20 address of the token on the Kava EVM
  bytes kava_erc20_address = 1;
  // Denom of the corresponding sdk.Coin
  string denom = 2;
}

// AllowedCosmosCoinERC20Token defines allowed cosmos-sdk denom & metadata
// for evm token representations of sdk assets.
// NOTE: once evm token contracts are deployed, changes to metadata for a given
// cosmos_denom will not change metadata of deployed contract.
message AllowedCosmosCoinERC20Token {
  option (gogoproto.goproto_getters) = false;

  // Denom of the sdk.Coin
  string cosmos_denom = 1;
  // Name of ERC20 contract
  string name = 2;
  // Symbol of ERC20 contract
  string symbol = 3;
  // Number of decimals ERC20 contract is deployed with.
  uint32 decimals = 4;
}

GenesisState defines the state that must be persisted when the blockchain stops/restarts in order for normal function of the evmutil module to resume.

message GenesisState {
  repeated Account accounts = 1 [(gogoproto.nullable) = false];
  Params params = 2 [(gogoproto.nullable) = false];
}

Account

An Account is a struct representing the excess akava balance of an address.

Since an address's total akava balance is derived from its ukava balance and the excess akava balance stored by the Account struct, the akava balance here should never exceed 1 ukava (10^12 akava).

message Account {
  bytes address = 1;
  string balance = 2;
}

Store

For complete implementation details for how items are stored, see keys.go. x/evmutil store state consists of accounts.