Contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@blobstream/DataRootTuple.sol";
import "@blobstream/lib/tree/binary/BinaryMerkleTree.sol";

import {IFunctionGateway} from "./interfaces/IFunctionGateway.sol";
import {IZKTendermintLightClient} from "@zk-tendermint/interfaces/IZKTendermintLightClient.sol";
import {IBlobstream} from "./IBlobstream.sol";

contract ZKBlobstream is IZKTendermintLightClient, IBlobstream {
    /////////////
    // Storage //
    /////////////

    /// @notice The address of the gateway contract.
    address public gateway;
    /// @notice The latest block that has been committed.
    uint64 public latestBlock;
    /// @notice The maximum number of blocks that can be skipped in a single request.
    uint64 public DATA_COMMITMENT_MAX = 1000;
    /// @notice Maps function names to their IDs.
    mapping(string => bytes32) public functionNameToId;
    /// @notice Maps block heights to their header hashes.
    mapping(uint64 => bytes32) public blockHeightToHeaderHash;
    /// @notice Maps block ranges to their data commitments. Block ranges are stored as keccak256(abi.encode(startBlock, endBlock)).
    mapping(bytes32 => bytes32) public dataCommitments;

    ////////////
    // Events //
    ////////////

    /// @notice Emitted when a combined step is requested.
    /// @param startBlock The start block of the combined step request.
    /// @param requestId The ID of the request.
    event CombinedStepRequested(uint64 indexed startBlock, bytes32 requestId);

    /// @notice Emitted when a combined step is fulfilled.
    /// @param startBlock The start block of the combined step request.
    /// @param targetHeader The header hash of the startBlock + 1.
    /// @param dataCommitment The data commitment of the block range [startBlock, startBlock + 1).
    event CombinedStepFulfilled(
        uint64 indexed startBlock,
        bytes32 targetHeader,
        bytes32 dataCommitment
    );

    /// @notice Emitted when a combined skip is requested.
    /// @param startBlock The start block of the combined skip request.
    /// @param targetBlock The target block of the combined skip request.
    /// @param requestId The ID of the request.
    event CombinedSkipRequested(
        uint64 indexed startBlock,
        uint64 indexed targetBlock,
        bytes32 requestId
    );

    /// @notice Emitted when a combined skip is fulfilled.
    /// @param startBlock The start block of the combined skip request.
    /// @param targetBlock The target block of the combined skip request.
    /// @param targetHeader The header hash of the target block.
    /// @param dataCommitment The data commitment of the block range [startBlock, targetBlock).
    event CombinedSkipFulfilled(
        uint64 indexed startBlock,
        uint64 indexed targetBlock,
        bytes32 targetHeader,
        bytes32 dataCommitment
    );

    ////////////
    // Errors //
    ////////////

    /// @notice Latest header not found.
    error LatestHeaderNotFound();
    /// @notice Function ID for name not found.
    error FunctionIdNotFound(string name);
    /// @notice Target block for proof must be greater than latest block.
    error TargetLessThanLatest();
    /// @notice The range of blocks in a request is greater than the maximum allowed.
    error ProofBlockRangeTooLarge();

    ///////////////
    // Modifiers //
    ///////////////

    /// @notice Modifier for restricting the gateway as the only caller for a function.
    modifier onlyGateway() {
        require(msg.sender == gateway, "Only gateway can call this function");
        _;
    }

    ///////////////
    // Functions //
    ///////////////

    /// @notice Initialize the contract with the address of the gateway contract.
    constructor(address _gateway) {
        gateway = _gateway;
    }

    /// @notice Update the address of the gateway contract.
    function updateGateway(address _gateway) external {
        gateway = _gateway;
    }

    /// @notice Update the function ID for a function name.
    function updateFunctionId(
        string memory name,
        bytes32 _functionId
    ) external {
        functionNameToId[name] = _functionId;
    }

    /// Note: Only for testnet. The genesis header should be set when initializing the contract.
    function setGenesisHeader(uint64 height, bytes32 header) external {
        blockHeightToHeaderHash[height] = header;
        latestBlock = height;
    }

    /// @notice Prove the validity of the header at requested block and a data commitment for the block range [latestBlock, requestedBlock).
    /// @param _requestedBlock The block to skip to.
    /// @dev Skip proof is valid if at least 1/3 of the voting power signed on requestedBlock is from validators in the validator set for latestBlock.
    /// Request will fail if the requested block is more than DATA_COMMITMENT_MAX blocks ahead of the latest block.
    /// Pass both the latest block and the requested block as context, as the latest block may change before the request is fulfilled.
    function requestCombinedSkip(uint64 _requestedBlock) external payable {
        bytes32 latestHeader = blockHeightToHeaderHash[latestBlock];
        if (latestHeader == bytes32(0)) {
            revert LatestHeaderNotFound();
        }
        bytes32 id = functionNameToId["combinedSkip"];
        if (id == bytes32(0)) {
            revert FunctionIdNotFound("combinedSkip");
        }

        // A request can be at most DATA_COMMITMENT_MAX blocks ahead of the latest block.
        if (_requestedBlock - latestBlock > DATA_COMMITMENT_MAX) {
            revert ProofBlockRangeTooLarge();
        }
        if (_requestedBlock <= latestBlock) {
            revert TargetLessThanLatest();
        }

        bytes32 requestId = IFunctionGateway(gateway).requestCallback{
            value: msg.value
        }(
            id,
            abi.encodePacked(latestBlock, latestHeader, _requestedBlock),
            abi.encode(latestBlock, _requestedBlock),
            this.callbackCombinedSkip.selector,
            500000
        );
        emit CombinedSkipRequested(latestBlock, _requestedBlock, requestId);
    }

    /// @notice Stores the new header for requestedBlock and the data commitment for the block range [latestBlock, requestedBlock).
    /// @param requestResult Contains the new header and data commitment.
    /// @param context Contains the latestBlock when skip was requested, and the requestedBlock to skip to.
    function callbackCombinedSkip(
        bytes memory requestResult,
        bytes memory context
    ) external onlyGateway {
        // Read the start block and target block of the skip proof from context.
        (uint64 skipStartBlock, uint64 skipTargetBlock) = abi.decode(
            context,
            (uint64, uint64)
        );
        // Read the target header and data commitment from request result.
        (bytes32 targetHeader, bytes32 dataCommitment) = abi.decode(
            requestResult,
            (bytes32, bytes32)
        );

        if (skipTargetBlock <= latestBlock) {
            revert TargetLessThanLatest();
        }

        blockHeightToHeaderHash[skipTargetBlock] = targetHeader;
        dataCommitments[
            keccak256(abi.encode(skipStartBlock, skipTargetBlock))
        ] = dataCommitment;
        latestBlock = skipTargetBlock;

        emit CombinedSkipFulfilled(
            skipStartBlock,
            skipTargetBlock,
            targetHeader,
            dataCommitment
        );
    }

    /// @notice Prove the validity of the header at latestBlock + 1 and a data commitment for the block range [latestBlock, latestBlock + 1).
    /// @dev Only used if 2/3 of voting power in a validator set changes in one block.
    function requestCombinedStep() external payable {
        bytes32 latestHeader = blockHeightToHeaderHash[latestBlock];
        if (latestHeader == bytes32(0)) {
            revert LatestHeaderNotFound();
        }
        bytes32 id = functionNameToId["combinedStep"];
        if (id == bytes32(0)) {
            revert FunctionIdNotFound("combinedStep");
        }

        bytes32 requestId = IFunctionGateway(gateway).requestCallback{
            value: msg.value
        }(
            id,
            abi.encodePacked(latestBlock, latestHeader),
            abi.encode(latestBlock),
            this.callbackCombinedStep.selector,
            500000
        );
        emit CombinedStepRequested(latestBlock, requestId);
    }

    /// @notice Stores the new header for latestBlock + 1 and the data commitment for the block range [latestBlock, latestBlock + 1).
    /// @param requestResult Contains the new header and data commitment.
    /// @param context Contains the latest block when step was requested.
    function callbackCombinedStep(
        bytes memory requestResult,
        bytes memory context
    ) external onlyGateway {
        // Read the prev block of the step proof from context.
        uint64 prevBlock = abi.decode(context, (uint64));
        // Read the new header and data commitment from request result.
        (bytes32 nextHeader, bytes32 dataCommitment) = abi.decode(
            requestResult,
            (bytes32, bytes32)
        );

        uint64 nextBlock = prevBlock + 1;
        if (nextBlock <= latestBlock) {
            revert TargetLessThanLatest();
        }

        blockHeightToHeaderHash[nextBlock] = nextHeader;
        dataCommitments[
            keccak256(abi.encode(prevBlock, nextBlock))
        ] = dataCommitment;
        latestBlock = nextBlock;

        emit CombinedStepFulfilled(prevBlock, nextHeader, dataCommitment);
    }

    /// @notice Get the function ID for a function name.
    function getFunctionId(string memory name) external view returns (bytes32) {
        return functionNameToId[name];
    }

    /// @notice Get the header hash for a block height.
    function getHeaderHash(uint64 height) external view returns (bytes32) {
        return blockHeightToHeaderHash[height];
    }

    /// @dev See "./IBlobstream.sol"
    function getDataCommitment(
        uint64 startBlock,
        uint64 endBlock
    ) external view returns (bytes32) {
        return dataCommitments[keccak256(abi.encode(startBlock, endBlock))];
    }

    /// @dev See "./IBlobstream.sol"
    function verifyMerkleProof(
        uint256 startBlock,
        uint256 endBlock,
        DataRootTuple memory _tuple,
        BinaryMerkleProof memory _proof
    ) external view returns (bool) {
        // Tuple must have been committed before.
        if (endBlock > latestBlock) {
            return false;
        }

        // Load the tuple root at the given index from storage.
        bytes32 root = dataCommitments[
            keccak256(abi.encode(startBlock, endBlock))
        ];

        // Verify the proof.
        bool isProofValid = BinaryMerkleTree.verify(
            root,
            _proof,
            abi.encode(_tuple)
        );

        return isProofValid;
    }
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

/// @notice A tuple of data root with metadata. Each data root is associated
///  with a Celestia block height.
/// @dev `availableDataRoot` in
///  https://github.com/celestiaorg/celestia-specs/blob/master/src/specs/data_structures.md#header
struct DataRootTuple {
    // Celestia block height the data root was included in.
    // Genesis block is height = 0.
    // First queryable block is height = 1.
    uint256 height;
    // Data root.
    bytes32 dataRoot;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

import "../Constants.sol";
import "../Utils.sol";
import "./TreeHasher.sol";
import "./BinaryMerkleProof.sol";

/// @title Binary Merkle Tree.
library BinaryMerkleTree {
    /// @notice Verify if element exists in Merkle tree, given data, proof, and root.
    /// @param root The root of the tree in which verify the given leaf.
    /// @param proof Binary Merkle proof for the leaf.
    /// @param data The data of the leaf to verify.
    /// @return `true` is proof is valid, `false` otherwise.
    /// @dev proof.numLeaves is necessary to determine height of subtree containing the data to prove.
    function verify(bytes32 root, BinaryMerkleProof memory proof, bytes memory data) internal pure returns (bool) {
        // Check proof is correct length for the key it is proving
        if (proof.numLeaves <= 1) {
            if (proof.sideNodes.length != 0) {
                return false;
            }
        } else if (proof.sideNodes.length != pathLengthFromKey(proof.key, proof.numLeaves)) {
            return false;
        }

        // Check key is in tree
        if (proof.key >= proof.numLeaves) {
            return false;
        }

        // A sibling at height 1 is created by getting the hash of the data to prove.
        bytes32 digest = leafDigest(data);

        // Null proof is only valid if numLeaves = 1
        // If so, just verify hash(data) is root
        if (proof.sideNodes.length == 0) {
            if (proof.numLeaves == 1) {
                return (root == digest);
            } else {
                return false;
            }
        }

        uint256 height = 1;
        uint256 stableEnd = proof.key;

        // While the current subtree (of height 'height') is complete, determine
        // the position of the next sibling using the complete subtree algorithm.
        // 'stableEnd' tells us the ending index of the last full subtree. It gets
        // initialized to 'key' because the first full subtree was the
        // subtree of height 1, created above (and had an ending index of
        // 'key').

        while (true) {
            // Determine if the subtree is complete. This is accomplished by
            // rounding down the key to the nearest 1 << 'height', adding 1
            // << 'height', and comparing the result to the number of leaves in the
            // Merkle tree.

            uint256 subTreeStartIndex = (proof.key / (1 << height)) * (1 << height);
            uint256 subTreeEndIndex = subTreeStartIndex + (1 << height) - 1;

            // If the Merkle tree does not have a leaf at index
            // 'subTreeEndIndex', then the subtree of the current height is not
            // a complete subtree.
            if (subTreeEndIndex >= proof.numLeaves) {
                break;
            }
            stableEnd = subTreeEndIndex;

            // Determine if the key is in the first or the second half of
            // the subtree.
            if (proof.sideNodes.length <= height - 1) {
                return false;
            }
            if (proof.key - subTreeStartIndex < (1 << (height - 1))) {
                digest = nodeDigest(digest, proof.sideNodes[height - 1]);
            } else {
                digest = nodeDigest(proof.sideNodes[height - 1], digest);
            }

            height += 1;
        }

        // Determine if the next hash belongs to an orphan that was elevated. This
        // is the case IFF 'stableEnd' (the last index of the largest full subtree)
        // is equal to the number of leaves in the Merkle tree.
        if (stableEnd != proof.numLeaves - 1) {
            if (proof.sideNodes.length <= height - 1) {
                return false;
            }
            digest = nodeDigest(digest, proof.sideNodes[height - 1]);
            height += 1;
        }

        // All remaining elements in the proof set will belong to a left sibling\
        // i.e proof sideNodes are hashed in "from the left"
        while (height - 1 < proof.sideNodes.length) {
            digest = nodeDigest(proof.sideNodes[height - 1], digest);
            height += 1;
        }

        return (digest == root);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface IFunctionGateway {
    function requestCallback(
        bytes32 _functionId,
        bytes memory _input,
        bytes memory _context,
        bytes4 _callbackSelector,
        uint32 _callbackGasLimit
    ) external payable returns (bytes32);

    function requestCall(
        bytes32 _functionId,
        bytes memory _input,
        address _address,
        bytes memory _data,
        uint32 _gasLimit
    ) external payable;

    function verifiedCall(
        bytes32 _functionId,
        bytes memory _input
    ) external view returns (bytes memory);

    function isCallback() external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

interface IZKTendermintLightClient {
    /// @notice Gets the ID of a function.
    /// @param name The name of the function.
    function getFunctionId(string memory name) external view returns (bytes32);

    /// @notice Gets the header hash of a block.
    /// @param blockNumber The block number to get the header hash of.
    function getHeaderHash(uint64 blockNumber) external view returns (bytes32);

    /// @notice Gets the latest block number updated by the light client.
    function latestBlock() external view returns (uint64);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@blobstream/DataRootTuple.sol";
import "@blobstream/lib/tree/binary/BinaryMerkleTree.sol";

interface IBlobstream {
    /// @notice Get the data commitment for a block range [startBlock, endBlock).
    function getDataCommitment(
        uint64 startBlock,
        uint64 endBlock
    ) external view returns (bytes32);

    /// @notice Verify a merkle proof for a specific block's data root against a data commitment containing the block.
    /// @param startBlock The start block of the block range that contains the proof's block.
    /// @param endBlock The end block of the block range that contains the proof's block.
    /// @param _tuple The data root tuple which is the leaf node of the proof and contains the block's data root.
    /// @param _proof The merkle proof to verify against the data commitment.
    function verifyMerkleProof(
        uint256 startBlock,
        uint256 endBlock,
        DataRootTuple memory _tuple,
        BinaryMerkleProof memory _proof
    ) external view returns (bool);
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

import "./Types.sol";

library Constants {
    ///////////////
    // Constants //
    ///////////////

    /// @dev Maximum tree height
    uint256 internal constant MAX_HEIGHT = 256;

    /// @dev The prefixes of leaves and nodes
    bytes1 internal constant LEAF_PREFIX = 0x00;
    bytes1 internal constant NODE_PREFIX = 0x01;
}

/// @dev Parity share namespace.
/// utility function to provide the parity share namespace as a Namespace struct.
function PARITY_SHARE_NAMESPACE() pure returns (Namespace memory) {
    return Namespace(0xFF, 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

import "./Constants.sol";

/// @notice Calculate the starting bit of the path to a leaf
/// @param numLeaves : The total number of leaves in the tree
/// @return startingBit : The starting bit of the path
// solhint-disable-next-line func-visibility
function getStartingBit(uint256 numLeaves) pure returns (uint256 startingBit) {
    // Determine height of the left subtree. This is the maximum path length, so all paths start at this offset from the right-most bit
    startingBit = 0;
    while ((1 << startingBit) < numLeaves) {
        startingBit += 1;
    }
    return Constants.MAX_HEIGHT - startingBit;
}

/// @notice Calculate the length of the path to a leaf
/// @param key: The key of the leaf
/// @param numLeaves: The total number of leaves in the tree
/// @return pathLength : The length of the path to the leaf
/// @dev A precondition to this function is that `numLeaves > 1`, so that `(pathLength - 1)` does not cause an underflow when pathLength = 0.
// solhint-disable-next-line func-visibility
function pathLengthFromKey(uint256 key, uint256 numLeaves) pure returns (uint256 pathLength) {
    // Get the height of the left subtree. This is equal to the offset of the starting bit of the path
    pathLength = Constants.MAX_HEIGHT - getStartingBit(numLeaves);

    // Determine the number of leaves in the left subtree
    uint256 numLeavesLeftSubTree = (1 << (pathLength - 1));

    // If leaf is in left subtree, path length is full height of left subtree
    if (key <= numLeavesLeftSubTree - 1) {
        return pathLength;
    }
    // If left sub tree has only one leaf but key is not there, path has one additional step
    else if (numLeavesLeftSubTree == 1) {
        return 1;
    }
    // Otherwise, add 1 to height and recurse into right subtree
    else {
        return 1 + pathLengthFromKey(key - numLeavesLeftSubTree, numLeaves - numLeavesLeftSubTree);
    }
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

import "../Constants.sol";

/// @notice Calculate the digest of a node.
/// @param left The left child.
/// @param right The right child.
/// @return digest The node digest.
/// @dev More details in https://github.com/celestiaorg/celestia-specs/blob/master/src/specs/data_structures.md#binary-merkle-tree
// solhint-disable-next-line func-visibility
function nodeDigest(bytes32 left, bytes32 right) pure returns (bytes32 digest) {
    digest = sha256(abi.encodePacked(Constants.NODE_PREFIX, left, right));
}

/// @notice Calculate the digest of a leaf.
/// @param data The data of the leaf.
/// @return digest The leaf digest.
/// @dev More details in https://github.com/celestiaorg/celestia-specs/blob/master/src/specs/data_structures.md#binary-merkle-tree
// solhint-disable-next-line func-visibility
function leafDigest(bytes memory data) pure returns (bytes32 digest) {
    digest = sha256(abi.encodePacked(Constants.LEAF_PREFIX, data));
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

/// @notice Merkle Tree Proof structure.
struct BinaryMerkleProof {
    // List of side nodes to verify and calculate tree.
    bytes32[] sideNodes;
    // The key of the leaf to verify.
    uint256 key;
    // The number of leaves in the tree
    uint256 numLeaves;
}

// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.19;

/// @notice A representation of the Celestia-app namespace ID and its version.
/// See: https://celestiaorg.github.io/celestia-app/specs/namespace.html
struct Namespace {
    // The namespace version.
    bytes1 version;
    // The namespace ID.
    bytes28 id;
}

using {equalTo, lessThan, greaterThan, toBytes} for Namespace global;

function equalTo(Namespace memory l, Namespace memory r) pure returns (bool) {
    return l.toBytes() == r.toBytes();
}

function lessThan(Namespace memory l, Namespace memory r) pure returns (bool) {
    return l.toBytes() < r.toBytes();
}

function greaterThan(Namespace memory l, Namespace memory r) pure returns (bool) {
    return l.toBytes() > r.toBytes();
}

function toBytes(Namespace memory n) pure returns (bytes29) {
    return bytes29(abi.encodePacked(n.version, n.id));
}

function toNamespace(bytes29 n) pure returns (Namespace memory) {
    bytes memory id = new bytes(28);
    for (uint256 i = 1; i < 29; i++) {
        id[i - 1] = n[i];
    }
    return Namespace(n[0], bytes28(id));
}

{
  "remappings": [
    "@succinctx/=lib/succinctx/contracts/src/",
    "@blobstream/=lib/blobstream-contracts/src/",
    "@zk-tendermint/=../../zk-tendermint/contracts/src/",
    "@openzeppelin/contracts/=lib/blobstream-contracts/lib/openzeppelin-contracts-upgradeable/contracts/",
    "blobstream-contracts/=lib/blobstream-contracts/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/blobstream-contracts/lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts-upgradeable/=lib/blobstream-contracts/lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/blobstream-contracts/lib/openzeppelin-contracts/",
    "tree/=lib/blobstream-contracts/src/lib/tree/",
    "verifier/=lib/blobstream-contracts/src/lib/verifier/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_gateway","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"string","name":"name","type":"string"}],"name":"FunctionIdNotFound","type":"error"},{"inputs":[],"name":"LatestHeaderNotFound","type":"error"},{"inputs":[],"name":"ProofBlockRangeTooLarge","type":"error"},{"inputs":[],"name":"TargetLessThanLatest","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint64","name":"startBlock","type":"uint64"},{"indexed":true,"internalType":"uint64","name":"targetBlock","type":"uint64"},{"indexed":false,"internalType":"bytes32","name":"targetHeader","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"dataCommitment","type":"bytes32"}],"name":"CombinedSkipFulfilled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint64","name":"startBlock","type":"uint64"},{"indexed":true,"internalType":"uint64","name":"targetBlock","type":"uint64"},{"indexed":false,"internalType":"bytes32","name":"requestId","type":"bytes32"}],"name":"CombinedSkipRequested","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint64","name":"startBlock","type":"uint64"},{"indexed":false,"internalType":"bytes32","name":"targetHeader","type":"bytes32"},{"indexed":false,"internalType":"bytes32","name":"dataCommitment","type":"bytes32"}],"name":"CombinedStepFulfilled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint64","name":"startBlock","type":"uint64"},{"indexed":false,"internalType":"bytes32","name":"requestId","type":"bytes32"}],"name":"CombinedStepRequested","type":"event"},{"inputs":[],"name":"DATA_COMMITMENT_MAX","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint64","name":"","type":"uint64"}],"name":"blockHeightToHeaderHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"requestResult","type":"bytes"},{"internalType":"bytes","name":"context","type":"bytes"}],"name":"callbackCombinedSkip","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"requestResult","type":"bytes"},{"internalType":"bytes","name":"context","type":"bytes"}],"name":"callbackCombinedStep","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"dataCommitments","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"","type":"string"}],"name":"functionNameToId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gateway","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint64","name":"startBlock","type":"uint64"},{"internalType":"uint64","name":"endBlock","type":"uint64"}],"name":"getDataCommitment","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"}],"name":"getFunctionId","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint64","name":"height","type":"uint64"}],"name":"getHeaderHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestBlock","outputs":[{"internalType":"uint64","name":"","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint64","name":"_requestedBlock","type":"uint64"}],"name":"requestCombinedSkip","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"requestCombinedStep","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint64","name":"height","type":"uint64"},{"internalType":"bytes32","name":"header","type":"bytes32"}],"name":"setGenesisHeader","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"bytes32","name":"_functionId","type":"bytes32"}],"name":"updateFunctionId","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_gateway","type":"address"}],"name":"updateGateway","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"startBlock","type":"uint256"},{"internalType":"uint256","name":"endBlock","type":"uint256"},{"components":[{"internalType":"uint256","name":"height","type":"uint256"},{"internalType":"bytes32","name":"dataRoot","type":"bytes32"}],"internalType":"struct DataRootTuple","name":"_tuple","type":"tuple"},{"components":[{"internalType":"bytes32[]","name":"sideNodes","type":"bytes32[]"},{"internalType":"uint256","name":"key","type":"uint256"},{"internalType":"uint256","name":"numLeaves","type":"uint256"}],"internalType":"struct BinaryMerkleProof","name":"_proof","type":"tuple"}],"name":"verifyMerkleProof","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000852a94f8309d445d27222edb1e92a4e83dddd2a8

-----Decoded View---------------
Arg [0] : _gateway (address): 0x852a94F8309D445D27222eDb1E92A4E83DdDd2a8

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000852a94f8309d445d27222edb1e92a4e83dddd2a8