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feat: implement concept Beacon Chain deposit proof verification in Pr… #937

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feat: implement concept Beacon Chain deposit proof verification in Pr… #937

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54 changes: 49 additions & 5 deletions contracts/0.8.25/vaults/PredepositGuardian.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -222,13 +222,57 @@ contract PredepositGuardian {

/// Internal functions

// function _isValidProof(
// bytes32[] calldata _proof,
// bytes32 _withdrawalCredentials,
// StakingVault.Deposit calldata _deposit
// ) internal pure returns (bool) {
// // proof logic
// return true;
// }

interface IBeaconRoot {
function get() external view returns (bytes32);
}

/// @dev Beacon Root Contract
address private constant BEACON_ROOT_CONTRACT = 0x00;

function _isValidProof(
bytes32[] calldata _proof,
bytes32 _withdrawalCredentials,
StakingVault.Deposit calldata _deposit
bytes32[] calldata proof, // Merkle Proof from Beacon Chain
bytes32 withdrawalCredentials, // Expected WC
StakingVault.Deposit calldata deposit // Deposit data to verify
) internal view returns (bool) {
// 1. Get root from Beacon Root Contract
bytes32 beaconRoot = IBeaconRoot(BEACON_ROOT_CONTRACT).get();

// 2. Hash depositData
bytes32 depositHash = keccak256(
abi.encode(deposit.pubkey, withdrawalCredentials, deposit.amount)
);

// 3. Verify Merkle Proof against beaconRoot
return _verifyMerkleProof(proof, beaconRoot, depositHash);
}

function _verifyMerkleProof(
bytes32[] calldata proof,
bytes32 root,
bytes32 leaf
) internal pure returns (bool) {
// proof logic
return true;
bytes32 computedHash = leaf;

for (uint256 i = 0; i < proof.length; i++) {
bytes32 proofElement = proof[i];

if (computedHash < proofElement) {
computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
} else {
computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
}
}

return computedHash == root;
}

function _topUpNodeOperatorCollateral(address _nodeOperator) internal {
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