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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

/**
 * @title VoidlyGradientRegistry
 * @notice Append-only registry for federated-learning gradient attestations (IPFS CIDs).
 * @dev Optimized for L2 (e.g., Base). Event model is indexer-friendly and on-chain reads are paginatable.
 */
contract VoidlyGradientRegistry {
    // -------------------------------------------------------------------------
    // Errors
    // -------------------------------------------------------------------------
    error NodeIdRequired();
    error IpfsHashRequired();
    error AttestationHashRequired();
    error NoAttestationsFound();
    error NotAuthorized();
    error IndexOutOfBounds();
    error InvalidNewOwner();
    error CountZero();
    error UnknownNode();

    // -------------------------------------------------------------------------
    // Types
    // -------------------------------------------------------------------------
    struct Attestation {
        // NOTE: Two dynamic fields first; fixed fields (uint64,address) follow and pack together in one slot.
        string ipfsHash;        // CID for gradient data (e.g., "Qm..."/CIDv0 or "bafy..."/CIDv1)
        string attestationHash; // CID for Ed25519 signature payload
        uint64 timestamp;       // Block timestamp (gas-lean vs uint256)
        address nodeOperator;   // submitter (msg.sender)
    }

    // -------------------------------------------------------------------------
    // Storage
    // -------------------------------------------------------------------------
    uint256 public constant VERSION = 1;

    address public owner;
    address public pendingOwner;

    // nodeKey = keccak256(nodeId); using bytes32 key is cheaper than string mapping
    mapping(bytes32 => Attestation[]) private _attestations;
    mapping(bytes32 => bool) private _seenNode;

    uint256 public totalAttestations; // global counter
    uint256 public nodeCount;         // count of unique nodeIds observed

    // -------------------------------------------------------------------------
    // Events
    // -------------------------------------------------------------------------
    /**
     * @dev NOTE: `nodeId` is NON-indexed so its literal value is visible in logs.
     * We index `nodeKey` (keccak) for cheap filtering + `operator` for actor filtering.
     */
    event GradientRegistered(
        bytes32 indexed nodeKey,
        address indexed operator,
        string nodeId,
        string ipfsHash,
        string attestationHash,
        uint64 timestamp
    );

    event NodeRegistered(
        bytes32 indexed nodeKey,
        address indexed firstOperator,
        string nodeId
    );

    event NodeSlashed(
        bytes32 indexed nodeKey,
        address indexed operator,
        string nodeId,
        string reason
    );

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    // -------------------------------------------------------------------------
    // Constructor / ownership
    // -------------------------------------------------------------------------
    constructor() {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        if (msg.sender != owner) revert NotAuthorized();
        _;
    }

    /// @notice Start two-step ownership transfer (safer for multisigs / ops).
    function transferOwnership(address newOwner) external onlyOwner {
        if (newOwner == address(0)) revert InvalidNewOwner();
        pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner, newOwner);
    }

    /// @notice Accept ownership after `transferOwnership`.
    function acceptOwnership() external {
        if (msg.sender != pendingOwner) revert NotAuthorized();
        address prev = owner;
        owner = msg.sender;
        pendingOwner = address(0);
        emit OwnershipTransferred(prev, owner);
    }

    // -------------------------------------------------------------------------
    // Core
    // -------------------------------------------------------------------------
    /**
     * @notice Register a gradient attestation.
     * @dev Permissionless by design; the protocol layer should decide which CIDs/IDs to trust.
     */
    function registerGradient(
        string calldata nodeId,
        string calldata ipfsHash,
        string calldata attestationHash
    ) external {
        if (bytes(nodeId).length == 0) revert NodeIdRequired();
        if (bytes(ipfsHash).length == 0) revert IpfsHashRequired();
        if (bytes(attestationHash).length == 0) revert AttestationHashRequired();

        bytes32 nodeKey = _nodeKey(nodeId);

        if (!_seenNode[nodeKey]) {
            _seenNode[nodeKey] = true;
            unchecked { nodeCount += 1; }
            emit NodeRegistered(nodeKey, msg.sender, nodeId);
        }

        uint64 t = uint64(block.timestamp);
        Attestation storage a = _attestations[nodeKey].push();
        a.ipfsHash = ipfsHash;
        a.attestationHash = attestationHash;
        a.timestamp = t;
        a.nodeOperator = msg.sender;

        unchecked { totalAttestations += 1; }

        emit GradientRegistered(
            nodeKey,
            msg.sender,
            nodeId,
            ipfsHash,
            attestationHash,
            t
        );
    }

    // -------------------------------------------------------------------------
    // Views
    // -------------------------------------------------------------------------

    /// @notice Return the full history (prefer range pagination for large sets).
    function getNodeHistory(string calldata nodeId)
        external
        view
        returns (Attestation[] memory)
    {
        return _attestations[_nodeKey(nodeId)];
    }

    /// @notice Return the latest attestation for a node.
    function getLatestAttestation(string calldata nodeId)
        external
        view
        returns (Attestation memory)
    {
        Attestation[] storage arr = _attestations[_nodeKey(nodeId)];
        uint256 len = arr.length;
        if (len == 0) revert NoAttestationsFound();
        return arr[len - 1];
    }

    /// @notice Return the number of attestations stored for a node.
    function getAttestationCount(string calldata nodeId)
        external
        view
        returns (uint256)
    {
        return _attestations[_nodeKey(nodeId)].length;
    }

    /// @notice Return the attestation at a given index (with bounds check).
    function getAttestationAt(
        string calldata nodeId,
        uint256 index
    ) external view returns (Attestation memory) {
        Attestation[] storage arr = _attestations[_nodeKey(nodeId)];
        if (index >= arr.length) revert IndexOutOfBounds();
        return arr[index];
    }

    /// @notice Paginate results to avoid returning huge arrays via eth_call.
    /// @param start inclusive start index
    /// @param count how many to return (must be > 0). Will clamp at end of array.
    function getAttestationsRange(
        string calldata nodeId,
        uint256 start,
        uint256 count
    ) external view returns (Attestation[] memory) {
        if (count == 0) revert CountZero();
        Attestation[] storage arr = _attestations[_nodeKey(nodeId)];
        uint256 len = arr.length;
        if (start >= len) revert IndexOutOfBounds();

        uint256 end = start + count;
        if (end > len) end = len;
        uint256 n = end - start;

        Attestation[] memory out = new Attestation[](n);
        for (uint256 i = 0; i < n; ) {
            out[i] = arr[start + i];
            unchecked { ++i; }
        }
        return out;
    }

    /// @notice Whether we have ever seen this nodeId (based on keccak(nodeId)).
    function existsNode(string calldata nodeId) external view returns (bool) {
        return _seenNode[_nodeKey(nodeId)];
    }

    // -------------------------------------------------------------------------
    // Slashing (event-only placeholder)
    // -------------------------------------------------------------------------

    /// @notice Record a slashing event (no funds movement; integrate real slashing later).
    function slashNode(string calldata nodeId, string calldata reason)
        external
        onlyOwner
    {
        bytes32 nodeKey = _nodeKey(nodeId);
        if (!_seenNode[nodeKey]) revert UnknownNode();
        emit NodeSlashed(nodeKey, msg.sender, nodeId, reason);
    }

    // -------------------------------------------------------------------------
    // Internal utilities
    // -------------------------------------------------------------------------

    function _nodeKey(string memory nodeId) private pure returns (bytes32) {
        return keccak256(bytes(nodeId));
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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VoidlyGradientRegistry.Attestation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"nodeId","type":"string"}],"name":"getAttestationCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"nodeId","type":"string"},{"internalType":"uint256","name":"start","type":"uint256"},{"internalType":"uint256","name":"count","type":"uint256"}],"name":"getAttestationsRange","outputs":[{"components":[{"internalType":"string","name":"ipfsHash","type":"string"},{"internalType":"string","name":"attestationHash","type":"string"},{"internalType":"uint64","name":"timestamp","type":"uint64"},{"internalType":"address","name":"nodeOperator","type":"address"}],"internalType":"struct VoidlyGradientRegistry.Attestation[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"nodeId","type":"string"}],"name":"getLatestAttestation","outputs":[{"components":[{"internalType":"string","name":"ipfsHash","type":"string"},{"internalType":"string","name":"attestationHash","type":"string"},{"internalType":"uint64","name":"timestamp","type":"uint64"},{"internalType":"address","name":"nodeOperator","type":"address"}],"internalType":"struct VoidlyGradientRegistry.Attestation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"nodeId","type":"string"}],"name":"getNodeHistory","outputs":[{"components":[{"internalType":"string","name":"ipfsHash","type":"string"},{"internalType":"string","name":"attestationHash","type":"string"},{"internalType":"uint64","name":"timestamp","type":"uint64"},{"internalType":"address","name":"nodeOperator","type":"address"}],"internalType":"struct VoidlyGradientRegistry.Attestation[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nodeCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingOwner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"nodeId","type":"string"},{"internalType":"string","name":"ipfsHash","type":"string"},{"internalType":"string","name":"attestationHash","type":"string"}],"name":"registerGradient","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"nodeId","type":"string"},{"internalType":"string","name":"reason","type":"string"}],"name":"slashNode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalAttestations","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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