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Merged
luiz-lvj merged 7 commits into from
Feb 24, 2026
Merged

[Provers H02] Update verifyStateCommitment #93

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update verifyStateCommitment
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78 changes: 67 additions & 11 deletions src/contracts/provers/linea/ChildToParentProver.sol
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

import {SparseMerkleProof} from "../../libraries/linea/SparseMerkleProof.sol";
import {ProverUtils} from "../../libraries/ProverUtils.sol";
import {IStateProver} from "../../interfaces/IStateProver.sol";
import {IBuffer} from "../../block-hash-pusher/interfaces/IBuffer.sol";
Expand All @@ -22,36 +23,91 @@ contract ChildToParentProver is IStateProver {

error CallNotOnHomeChain();
error CallOnHomeChain();
error InvalidAccountProof();
error InvalidStorageProof();
error StorageValueMismatch();
error AccountKeyMismatch();
error AccountValueMismatch();
error StorageKeyMismatch();
error InvalidTargetStateCommitment();

constructor(address _blockHashBuffer, uint256 _homeChainId) {
blockHashBuffer = _blockHashBuffer;
homeChainId = _homeChainId;
}

/// @notice Get a parent chain block hash from the buffer at `blockHashBuffer` using a storage proof
/// @param homeBlockHash The block hash of the home chain.
/// @param input ABI encoded (bytes blockHeader, uint256 targetBlockNumber, bytes accountProof, bytes storageProof)
function verifyTargetStateCommitment(bytes32 homeBlockHash, bytes calldata input)
/// @notice Get a parent chain block hash from the buffer at `blockHashBuffer` using a Linea SMT proof
/// @dev Linea uses Sparse Merkle Trees with MiMC hashing.
/// Proofs must be generated using linea_getProof RPC method.
/// @param homeState The state root of the home chain (Linea SMT state root).
/// @param input ABI encoded (uint256 targetBlockNumber, uint256 accountLeafIndex, bytes[] accountProof,
/// bytes accountValue, uint256 storageLeafIndex, bytes[] storageProof, bytes32 claimedStorageValue)
function verifyTargetStateCommitment(bytes32 homeState, bytes calldata input)
external
view
returns (bytes32 targetStateCommitment)
{
if (block.chainid == homeChainId) {
revert CallOnHomeChain();
}
// decode the input
(bytes memory rlpBlockHeader, uint256 targetBlockNumber, bytes memory accountProof, bytes memory storageProof) =
abi.decode(input, (bytes, uint256, bytes, bytes));

uint256 targetBlockNumber;
uint256 accountLeafIndex;
bytes[] memory accountProof;
bytes memory accountValue;
uint256 storageLeafIndex;
bytes[] memory storageProof;
bytes32 claimedStorageValue;

(
targetBlockNumber,
accountLeafIndex,
accountProof,
accountValue,
storageLeafIndex,
storageProof,
claimedStorageValue
) = abi.decode(input, (uint256, uint256, bytes[], bytes, uint256, bytes[], bytes32));

// calculate the slot based on the provided block number
// see: https://github.com/openintentsframework/broadcaster/blob/8d02f8e8e39de27de8f0ded481d3c4e5a129351f/src/contracts/block-hash-pusher/BaseBuffer.sol#L24
uint256 slot = uint256(SlotDerivation.deriveMapping(bytes32(BLOCK_HASH_MAPPING_SLOT), targetBlockNumber));

// verify proofs and get the block hash
targetStateCommitment = ProverUtils.getSlotFromBlockHeader(
homeBlockHash, rlpBlockHeader, blockHashBuffer, slot, accountProof, storageProof
);
bool accountValid = SparseMerkleProof.verifyProof(accountProof, accountLeafIndex, homeState);
if (!accountValid) {
revert InvalidAccountProof();
}

SparseMerkleProof.Leaf memory accountLeaf = SparseMerkleProof.getLeaf(accountProof[accountProof.length - 1]);
bytes32 expectedAccountHKey = SparseMerkleProof.hashAccountKey(blockHashBuffer);
if (accountLeaf.hKey != expectedAccountHKey) {
revert AccountKeyMismatch();
}

bytes32 expectedAccountHValue = SparseMerkleProof.hashAccountValue(accountValue);
if (accountLeaf.hValue != expectedAccountHValue) {
revert AccountValueMismatch();
}

SparseMerkleProof.Account memory accountData = SparseMerkleProof.getAccount(accountValue);

bool storageValid = SparseMerkleProof.verifyProof(storageProof, storageLeafIndex, accountData.storageRoot);
if (!storageValid) {
revert InvalidStorageProof();
}

SparseMerkleProof.Leaf memory storageLeaf = SparseMerkleProof.getLeaf(storageProof[storageProof.length - 1]);
bytes32 expectedStorageHKey = SparseMerkleProof.hashStorageKey(bytes32(slot));
if (storageLeaf.hKey != expectedStorageHKey) {
revert StorageKeyMismatch();
}

bytes32 expectedHValue = SparseMerkleProof.hashStorageValue(claimedStorageValue);
if (storageLeaf.hValue != expectedHValue) {
revert StorageValueMismatch();
}

targetStateCommitment = claimedStorageValue;
require(targetStateCommitment != bytes32(0), InvalidTargetStateCommitment());
}

Expand Down
110 changes: 110 additions & 0 deletions test/payloads/linea/buffer-proof.json
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,110 @@
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"accountProof": {
"key": "0x12432deeeebff3abf63549206de28fa4dec04638",
"leafIndex": 673653,
"proof": {
"value": "0x0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000009f81ae5665fb84995e1dfbe2323bd69117cf371a555ea8ac86a554362dd0c890729d847e461f41999bcd5341526994c155b990f7c36053e191e2ea35596ca8502c4bfece5f919cea85fdc6176179f14eb072611c00707de723dddd9c60db07a0000000000000000000000000000000000000000000000000000000000000ba5",
"proofRelatedNodes": [
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]
}
},
"storageProofs": [
{
"key": "0x16d7edaa6ad8331dfb1c5003d573904dead972df0b61c44ab5f2636ae0f5f746",
"leafIndex": 240,
"proof": {
"value": "0x3d202b937d57f129b40c81922ea4f3820df711e9770150ee3fbb63e071f5cf9f",
"proofRelatedNodes": [
"0x00000000000000000000000000000000000000000000000000000000000000f90cc2d861a2a43c4e9bbc8af123aa65121234cff9a6e9327433c1ee41bbce1536",
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}
}
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