ERC721Permit

ERC721 with permit

Nonfungible tokens that support an approve via signature, i.e. permit

Variables

bytes32 PERMIT_TYPEHASH constant

The permit typehash used in the permit signature

Developer note: Value is equal to keccak256("Permit(address spender,uint256 tokenId,uint256 nonce,uint256 deadline)");

Functions

DOMAIN_SEPARATOR

function DOMAIN_SEPARATOR() public view returns (bytes32) view public

The domain separator used in the permit signature

Returns:

Name	Type	Description
[0]	bytes32	The domain separator used in encoding of permit signature

permit

function permit(address spender, uint256 tokenId, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external payable payable external

Approve of a specific token ID for spending by spender via signature

Name	Type	Description
spender	address	The account that is being approved
tokenId	uint256	The ID of the token that is being approved for spending
deadline	uint256	The deadline timestamp by which the call must be mined for the approve to work
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`