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Unified outputs #53
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Unified outputs #53
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BREAKING CHANGE: This commit removes constants `VOUCHER_METADATA_LOG2_SIZE`, `NOTICE_METADATA_LOG2_SIZE`, `EPOCH_VOUCHER_LOG2_SIZE`, and `EPOCH_NOTICE_LOG2_SIZE` from the `CanonicalMachine` library; and parameters `outputEpochLog2Size` and `outputHashesLog2Size` from the `validateEncodedOutput` function in `LibOutputValidation`.
* Outputs are now encoded like Solidity function calls. Notices are like function calls to `Notice(bytes)`, and vouchers, to `Voucher(address,bytes)`. BREAKING CHANGE: Changes the encoding of outputs.
* The epoch hash used to be composed by three Merkle trees: one for the vouchers generated in the epoch, another for the notices generated in the epoch, and a third one for the machine address space as a whole. This commit unifies vouchers and notices in the same Merkle tree, making the epoch hash composed now of only two Merkle trees: one for the outputs generated in the epoch, and another for the machine. * The leaves of this new tree represent any type of output: voucher, notice, or any other output that we might come up with in the future. Their binary representations are disjoint because of a 4-byte header. * This unification greatly simplifies the output validation algorithm, and removes a 256-bit field from the `OutputValidityProof` struct. * Add text to `LibOutputValidation` that explains how the epoch hash is calculated, with the help of an ASCII diagram BREAKING CHANGE: Removes fields `vouchersEpochRootHash` and `noticesEpochRootHash` from the `OutputValidityProof` struct, and adds `outputsEpochRootHash`. Changes the epoch hash calculation.
* In order to test the changes made to the output validation library, a workaround was implemented that uses the notice tree as the output tree for the new algorithm. This workaround is temporary and should be replaced when a new version of the echo machine is made available.
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Rebased. |
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This PR has been migrated to cartesi/rollups-contracts#43. |
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