ERC-3009 Transfer With Authorization

DraftERCcreated 2020-09-282 later proposals build on itrequires ERC-20, EIP-712

Transfer fungible assets via a signed authorization

Authors: Peter Jihoon Kim (@petejkim), Kevin Britz (@kbrizzle), David Knott (@DavidLKnott)

ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

IDeFiToken 0x1fb0c39e

`0xb6b55f25`	`deposit(uint256)`
`0xa9059cbb`	`transfer(address,uint256)`

Topic0 is the keccak256 hash of the signature, which is what a log filter matches on.

`0x98de503528ee59b575ef0c0a2576a82497bfc029a5685b209e9ec333479b10a5`	`AuthorizationUsed(address,bytes32)`
`0x1cdd46ff242716cdaa72d159d339a485b3438398348d68f09d7c8c0a59353d81`	`AuthorizationCanceled(address,bytes32)`

Proposals this one names in its requires field.

Later proposals that name this one in their requires field.