IERC20PermitAllowed

Interface used by DAI/CHAI for permit

Functions

permit

Approve the spender to spend some tokens via the holder signature

This is the permit interface used by DAI and CHAI

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

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`expiry`	`uint256`	The timestamp at which the permit is no longer valid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`