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fix(protocol): make mixHash have random number from beaconchain #13156

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Feb 15, 2023
Merged

fix(protocol): make mixHash have random number from beaconchain #13156

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10 changes: 7 additions & 3 deletions packages/protocol/contracts/L1/libs/LibProposing.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -109,9 +109,13 @@ library LibProposing {
meta.l1Hash = blockhash(block.number - 1);
meta.timestamp = uint64(block.timestamp);

// if multiple L2 blocks included in the same L1 block,
// their block.mixHash fields for randomness will be the same.
meta.mixHash = bytes32(block.difficulty);
// After The Merge, mixHash contains the prevrandao
// from the beacon chain. Since multiple Taiko blocks
// can be proposed in one Ethereum block, we need to
// add salt to this random number.
meta.mixHash = keccak256(
abi.encodePacked(block.prevrandao, state.nextBlockId)
);
}

uint256 deposit;
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