Add Token Meta Transactions

[riusricardo]

Scope

• Tokens ERC-20 and ERC-721 can't be transferred unless the required gas for the transaction is payed by the sender.
• In order to use this functionality, the tokens need to have a glue layer to enable the usage of the gas station.
• The actual limitation is that the Meta transactions are signed by the sender, in this case the relay. To accept this limitation, the tokens need to use a special function to get the original sender and stop considering the relay as the sender.

Deliverables

• ERC-20 and ERC721 meta transactions glue layer.
• Update the required ERC-721/Badges to use this new approach.
• Update the ERC-20 contracts like the vendable token, to use this functionality.

Roles

bounty gardener: @riusricardo / 10%
bounty worker: name / 80%
bounty reviewer: name / 10%