IERC20PermitAllowed

Interface used by DAI/CHAI for permit

Functions​

permit​

  function permit(
    address holder,
    address spender,
    uint256 nonce,
    uint256 expiry,
    bool allowed,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external

Approve the spender to spend some tokens via the holder signature

This is the permit interface used by DAI and CHAI

Parameters:​

Name	Type	Description
holder	address	The address of the token holder, the token owner
spender	address	The address of the token spender
nonce	uint256	The holder's nonce, increases at each call to permit
expiry	uint256	The timestamp at which the permit is no longer valid
allowed	bool	Boolean that sets approval amount, true for type(uint256).max and false for 0
v	uint8	Must produce valid secp256k1 signature from the holder along with r and s
r	bytes32	Must produce valid secp256k1 signature from the holder along with v and s
s	bytes32	Must produce valid secp256k1 signature from the holder along with r and v