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Changelog

2.2.0, Introduce NativeFiatToken variant (2026-03-13)

  • Introduce NativeFiatTokenV2_2 Solidity implementation.
  • Add comprehensive test coverage for NativeFiatToken (unit + integration as applicable).
  • Add precompile interface definitions required by NativeFiatToken: INativeCoinControl & INativeCoinAuthority
  • Add deployment script for NativeFiatToken.
  • Mark selected functions in FiatTokenV1, FiatTokenV2, and FiatTokenV2_2 as virtual to enable NativeFiatToken overrides (no functional behavior changes intended beyond extensibility).

2.2.0, Celo variant (2024-04-08)

  • Add ICeloGasToken and IFiatTokenFeeAdapter per Celo documentation
  • Add FiatTokenFeeAdapterProxy and FiatTokenFeeAdapterV1 to support USDC as gas on Celo
  • Implement debitGasFees and creditGasFees in FiatTokenCeloV2_2

2.2.0 (2023-11-09)

  • Add ERC-1271 signature validation support to EIP-2612 and EIP-3009 functions
  • Combine the balance state and the blacklist state for an address in a balanceAndBlacklistStates map to reduce gas usage
  • Update DOMAIN_SEPARATOR to be a dynamic value
  • Remove notBlacklisted modifiers for approve, increaseAllowance, decreaseAllowance and permit
  • Enable bypassing TIMESTAMP opcode in permit by using uint256.max

2.1.1 (2021-06-03)

  • Add the multi-issuer minter contracts from the multi-issuer branch

2.1.0 (2021-02-17)

  • Move locked USDC to a "lost and found" address and blacklists itself so that accidental sends will no longer be possible
  • Conform to EIP-3009 in FiatToken
    • Add receiveWithAuthorization
    • Remove approveWithAuthorization, increaseAllowanceWithAuthorization and decreaseAllowanceWithAuthorization

2.0.0 (2020-07-30)

  • Add support for EIP-2612 in FiatToken
  • Add transferWithAuthorization, approveWithAuthorization, increaseAllowanceWithAuthorization, decreaseAllowanceWithAuthorization to enable ETH-less transactions
  • Add increaseAllowance and decreaseAllowance to mitigate the multi-withdrawal attack vulnerability in ERC-20 approve function
  • Update Solidity version to 0.6.12

1.1.0 (2020-05-27)

  • Add Rescuable functionalities to FiatToken
  • Update Solidity version to 0.6.8
  • Remove ifAdmin modifier from admin() and implementation() in FiatTokenProxy

1.0.0 (2018-07-24)

  • Create ERC-20 compliant FiatToken contract
  • Add Ownable, Pausable and Blacklistable functionalities to FiatToken
  • Create FiatTokenProxy contracts based on Zeppelinos's Unstructured-Storage Proxy pattern