Initial Meridian Protocol implementation
- Complete MeridianToken standard with compliance & reserve checks - Multi-custodian ReserveAggregator supporting bank/crypto/fund admin - Comprehensive Compliance engine with KYC/AML/sanctions - Full interface definitions and deployment scripts - Test suite for core functionality - Ready for GBP launch with Anchorage custody integration
This commit is contained in:
Claude AI
374
contracts/aggregator/ReserveAggregator.sol
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374
contracts/aggregator/ReserveAggregator.sol
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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import "@openzeppelin/contracts/access/AccessControl.sol";
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import "@openzeppelin/contracts/security/Pausable.sol";
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import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
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import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
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import "../interfaces/IReserveAggregator.sol";
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/**
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* @title ReserveAggregator
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* @dev Aggregates reserve attestations from multiple custodian types
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* Supports: Tier-1 banks (Chainlink PoR), crypto custodians (on-chain push), fund administrators (signed oracle)
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*/
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contract ReserveAggregator is IReserveAggregator, AccessControl, Pausable, ReentrancyGuard {
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bytes32 public constant ATTESTOR_ROLE = keccak256("ATTESTOR_ROLE");
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bytes32 public constant CUSTODIAN_MANAGER_ROLE = keccak256("CUSTODIAN_MANAGER_ROLE");
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// Custodian storage
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mapping(bytes32 => CustodianInfo) public custodians;
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mapping(bytes32 => ReserveAttestation) public latestAttestations;
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bytes32[] public activeCustodianIds;
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// Reserve tracking
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uint256 public totalReserveValue;
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uint256 public lastUpdateTime;
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// Configuration
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uint256 public maxStalenessWindow = 24 hours; // Global max staleness
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uint256 public minimumCustodians = 1; // Minimum active custodians required
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modifier onlyValidCustodian(bytes32 custodianId) {
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require(custodians[custodianId].isActive, "Custodian not active");
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_;
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}
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constructor(address admin) {
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require(admin != address(0), "Invalid admin address");
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_grantRole(DEFAULT_ADMIN_ROLE, admin);
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_grantRole(CUSTODIAN_MANAGER_ROLE, admin);
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_grantRole(ATTESTOR_ROLE, admin);
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}
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/**
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* @dev Add a new custodian to the aggregator
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* @param custodianId Unique identifier for custodian
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* @param name Human-readable custodian name
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* @param oracle Oracle address (Chainlink feed, contract, or EOA)
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* @param heartbeat Maximum staleness in seconds
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* @param custodianType 0=bank, 1=crypto, 2=fund_admin
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*/
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function addCustodian(
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bytes32 custodianId,
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string memory name,
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address oracle,
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uint256 heartbeat,
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uint8 custodianType
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) external onlyRole(CUSTODIAN_MANAGER_ROLE) {
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require(custodianId != bytes32(0), "Invalid custodian ID");
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require(oracle != address(0), "Invalid oracle address");
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require(heartbeat > 0 && heartbeat <= maxStalenessWindow, "Invalid heartbeat");
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require(custodianType <= 2, "Invalid custodian type");
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require(!custodians[custodianId].isActive, "Custodian already exists");
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custodians[custodianId] = CustodianInfo({
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name: name,
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oracle: oracle,
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lastUpdateTime: 0,
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heartbeat: heartbeat,
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isActive: true,
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custodianType: custodianType
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});
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activeCustodianIds.push(custodianId);
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emit CustodianAdded(custodianId, name, oracle);
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}
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/**
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* @dev Update custodian oracle and heartbeat
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*/
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function updateCustodian(
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bytes32 custodianId,
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address newOracle,
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uint256 newHeartbeat
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) external onlyRole(CUSTODIAN_MANAGER_ROLE) onlyValidCustodian(custodianId) {
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require(newOracle != address(0), "Invalid oracle address");
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require(newHeartbeat > 0 && newHeartbeat <= maxStalenessWindow, "Invalid heartbeat");
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custodians[custodianId].oracle = newOracle;
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custodians[custodianId].heartbeat = newHeartbeat;
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emit CustodianUpdated(custodianId, newOracle, newHeartbeat);
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}
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/**
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* @dev Deactivate a custodian
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*/
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function deactivateCustodian(bytes32 custodianId) external onlyRole(CUSTODIAN_MANAGER_ROLE) {
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require(custodians[custodianId].isActive, "Custodian not active");
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custodians[custodianId].isActive = false;
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// Remove from active array
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for (uint i = 0; i < activeCustodianIds.length; i++) {
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if (activeCustodianIds[i] == custodianId) {
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activeCustodianIds[i] = activeCustodianIds[activeCustodianIds.length - 1];
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activeCustodianIds.pop();
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break;
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}
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}
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emit CustodianDeactivated(custodianId);
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_updateTotalReserveValue();
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}
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/**
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* @dev Attest reserves for a custodian (manual/signed attestation)
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* @param custodianId Custodian identifier
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* @param balance Reserve balance in token denomination
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* @param documentHash IPFS hash of supporting documentation
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*/
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function attestReserves(
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bytes32 custodianId,
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uint256 balance,
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bytes32 documentHash
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) external onlyRole(ATTESTOR_ROLE) onlyValidCustodian(custodianId) nonReentrant {
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require(documentHash != bytes32(0), "Document hash required");
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// For manual attestations, custodian type should be fund_admin (2)
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require(custodians[custodianId].custodianType == 2, "Manual attestation only for fund administrators");
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latestAttestations[custodianId] = ReserveAttestation({
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balance: balance,
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timestamp: block.timestamp,
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documentHash: documentHash,
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attestor: msg.sender,
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isValid: true
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});
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custodians[custodianId].lastUpdateTime = block.timestamp;
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emit ReserveAttested(custodianId, balance, documentHash);
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_updateTotalReserveValue();
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}
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/**
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* @dev Pull reserve value from Chainlink PoR feed (for bank custodians)
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* @param custodianId Custodian identifier
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*/
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function pullChainlinkReserves(bytes32 custodianId) external onlyValidCustodian(custodianId) {
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require(custodians[custodianId].custodianType == 0, "Only for bank custodians");
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AggregatorV3Interface priceFeed = AggregatorV3Interface(custodians[custodianId].oracle);
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try priceFeed.latestRoundData() returns (
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uint80 roundId,
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int256 price,
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uint256 startedAt,
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uint256 updatedAt,
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uint80 answeredInRound
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) {
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require(price >= 0, "Invalid reserve value");
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require(updatedAt > 0, "Invalid timestamp");
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require(block.timestamp - updatedAt <= custodians[custodianId].heartbeat, "Data too stale");
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latestAttestations[custodianId] = ReserveAttestation({
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balance: uint256(price),
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timestamp: updatedAt,
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documentHash: bytes32(roundId), // Use round ID as reference
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attestor: custodians[custodianId].oracle,
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isValid: true
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});
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custodians[custodianId].lastUpdateTime = updatedAt;
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emit ReserveAttested(custodianId, uint256(price), bytes32(roundId));
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_updateTotalReserveValue();
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} catch {
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revert("Failed to fetch Chainlink data");
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}
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}
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/**
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* @dev Push reserve attestation from crypto custodian contract
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* @param custodianId Custodian identifier
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* @param balance Reserve balance
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* @param proof Cryptographic proof of reserves
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*/
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function pushCryptoReserves(
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bytes32 custodianId,
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uint256 balance,
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bytes calldata proof
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) external onlyValidCustodian(custodianId) {
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require(custodians[custodianId].custodianType == 1, "Only for crypto custodians");
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require(msg.sender == custodians[custodianId].oracle, "Only authorized oracle");
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// Verify proof (implementation depends on custodian's proof system)
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require(_verifyReserveProof(balance, proof), "Invalid reserve proof");
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latestAttestations[custodianId] = ReserveAttestation({
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balance: balance,
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timestamp: block.timestamp,
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documentHash: keccak256(proof),
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attestor: msg.sender,
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isValid: true
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});
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custodians[custodianId].lastUpdateTime = block.timestamp;
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emit ReserveAttested(custodianId, balance, keccak256(proof));
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_updateTotalReserveValue();
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}
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/**
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* @dev Get total reserve value across all active custodians
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*/
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function getTotalReserveValue() external view override returns (uint256, bool) {
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if (activeCustodianIds.length < minimumCustodians) {
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return (0, false);
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}
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uint256 total = 0;
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bool allValid = true;
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for (uint i = 0; i < activeCustodianIds.length; i++) {
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bytes32 custodianId = activeCustodianIds[i];
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(uint256 value, bool isValid) = getCustodianReserveValue(custodianId);
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if (!isValid) {
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allValid = false;
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continue;
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}
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total += value;
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}
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return (total, allValid && total > 0);
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}
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/**
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* @dev Get reserve value from specific custodian
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*/
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function getCustodianReserveValue(bytes32 custodianId) public view override returns (uint256, bool) {
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if (!custodians[custodianId].isActive) {
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return (0, false);
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}
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ReserveAttestation memory attestation = latestAttestations[custodianId];
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if (!attestation.isValid || attestation.timestamp == 0) {
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return (0, false);
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}
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// Check staleness
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uint256 staleness = block.timestamp - attestation.timestamp;
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if (staleness > custodians[custodianId].heartbeat) {
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return (0, false);
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}
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return (attestation.balance, true);
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}
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/**
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* @dev Get custodian information
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*/
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function getCustodianInfo(bytes32 custodianId) external view override returns (CustodianInfo memory) {
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return custodians[custodianId];
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}
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/**
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* @dev Get latest attestation
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*/
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function getLatestAttestation(bytes32 custodianId) external view override returns (ReserveAttestation memory) {
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return latestAttestations[custodianId];
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}
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/**
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* @dev Check for stale data across custodians
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*/
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function checkDataStaleness() external view override returns (bool, bytes32[] memory) {
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bytes32[] memory staleCustodians = new bytes32[](activeCustodianIds.length);
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uint256 staleCount = 0;
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for (uint i = 0; i < activeCustodianIds.length; i++) {
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bytes32 custodianId = activeCustodianIds[i];
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ReserveAttestation memory attestation = latestAttestations[custodianId];
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if (attestation.timestamp == 0) {
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staleCustodians[staleCount] = custodianId;
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staleCount++;
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continue;
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}
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uint256 staleness = block.timestamp - attestation.timestamp;
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if (staleness > custodians[custodianId].heartbeat) {
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staleCustodians[staleCount] = custodianId;
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staleCount++;
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}
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}
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// Resize array to actual stale count
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bytes32[] memory result = new bytes32[](staleCount);
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for (uint i = 0; i < staleCount; i++) {
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result[i] = staleCustodians[i];
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}
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return (staleCount > 0, result);
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}
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/**
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* @dev Update configuration parameters
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*/
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function updateConfiguration(
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uint256 newMaxStaleness,
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uint256 newMinimumCustodians
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) external onlyRole(DEFAULT_ADMIN_ROLE) {
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require(newMaxStaleness >= 1 hours, "Staleness too short");
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require(newMaxStaleness <= 7 days, "Staleness too long");
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require(newMinimumCustodians > 0, "Must have minimum custodians");
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maxStalenessWindow = newMaxStaleness;
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minimumCustodians = newMinimumCustodians;
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}
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/**
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* @dev Internal function to verify reserve proofs (placeholder)
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*/
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function _verifyReserveProof(uint256 balance, bytes calldata proof) internal pure returns (bool) {
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// Implementation depends on custodian's specific proof system
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// Could be Merkle proof, ZK proof, signature verification, etc.
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return proof.length > 0 && balance > 0;
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}
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/**
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* @dev Internal function to recalculate total reserves
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*/
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function _updateTotalReserveValue() internal {
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(uint256 newTotal, bool isValid) = this.getTotalReserveValue();
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if (isValid) {
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totalReserveValue = newTotal;
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lastUpdateTime = block.timestamp;
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}
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}
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/**
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* @dev Get active custodian count
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*/
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function getActiveCustodianCount() external view returns (uint256) {
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return activeCustodianIds.length;
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}
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/**
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* @dev Get all active custodian IDs
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*/
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function getActiveCustodianIds() external view returns (bytes32[] memory) {
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return activeCustodianIds;
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}
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/**
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* @dev Pause operations
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*/
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function pause() external onlyRole(DEFAULT_ADMIN_ROLE) {
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_pause();
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}
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/**
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* @dev Unpause operations
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*/
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function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) {
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_unpause();
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}
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}
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