BIP-X: Tractor (+ Junctions) - #727
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…eld-and-housekeeping
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…eanstalk into tractor-generalized
…Beanstalk into tractor-generalized
Brean0
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Mar 28, 2024
| BLUEPRINT_TYPE_HASH, | ||
| blueprint.publisher, | ||
| keccak256(blueprint.data), | ||
| keccak256(abi.encodePacked(blueprint.operatorPasteInstrs)), |
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is there a reason that this uses abi.encodePacked vs the regular abi.encode?
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great question
it's an inline way for adhering to the eip712 spec
the correct way to pack a list of objects in eip712 is to
- encode each object
- concatenate all encoded data
- hash the concatenation
here each object is a bytes32 so it is already 'encoded', so the encodePacked directly concatenates them all without extraneous bytes. then they are hashed.
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Tractor
Tractor is a system to give a third party operator permission to perform any Beanstalk action on behalf of the publisher.