IERC20PermitAllowed.sol
Interface used by DAI/CHAI for permit
Methods
permit
Approve the spender to spend some tokens via the holder signature
Solidity
function permit(address holder, address spender, uint256 nonce, uint256 expiry, bool allowed, uint8 v, bytes32 r, bytes32 s) external nonpayable
Details
This is the permit interface used by DAI and CHAI
Parameters
| Name | Type | Description |
|---|---|---|
| holder | address | Address of the token holder, the token owner |
| spender | address | Address of the token spender |
| nonce | uint256 | Holder's nonce, increases at each call to permit |
| expiry | uint256 | Timestamp at which the permit is no longer valid |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 |