ERC-2771 Secure Protocol for Native Meta Transactions

FinalERCcreated 2020-07-015 later proposals build on it

A contract interface for receiving meta transactions through a trusted forwarder

Authors: Ronan Sandford (@wighawag), Liraz Siri (@lirazsiri), Dror Tirosh (@drortirosh), Yoav Weiss (@yoavw), Alex Forshtat (@forshtat), Hadrien Croubois (@Amxx), Sachin Tomar (@tomarsachin2271), Patrick McCorry (@stonecoldpat), Nicolas Venturo (@nventuro), Fabian Vogelsteller (@frozeman), Gavin John (@Pandapip1)

Functions this standard introduces (2)

`0x572b6c05`	`isTrustedForwarder(address)`
`0xd38ea5bf`	`purchaseItem(uint256)`

Built on by (5)

Later proposals that name this one in their requires field.

What the specification covers

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