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EVM Precompiles

QoreChain extends the QoreChain EVM Engine with six custom precompiled contracts that expose protocol-level features directly to Solidity. These precompiles provide on-chain access to post-quantum cryptography, AI risk scoring, cross-VM messaging, and PRISM consensus parameters.

note

Precompiles are available on both the qorechain-vladi mainnet (EVM chain ID 9801, live since 7 June 2026 on chain version v3.1.85) and the qorechain-diana testnet (EVM chain ID 9800). All examples use the JSON-RPC endpoint on port 8545.

Precompile Address Map​

PrecompileAddressBase GasDescription
CrossVM Bridge0x000000000000000000000000000000000000090150,000Synchronous cross-VM calls (EVM to CosmWasm)
PQC Verify0x0000000000000000000000000000000000000A0125,000 + 8/byteVerify ML-DSA-87 post-quantum signatures
PQC Key Status0x0000000000000000000000000000000000000A022,500Check if an account has a registered PQC key
AI Risk Score0x0000000000000000000000000000000000000B0150,000Get AI-generated risk score for transaction data
AI Anomaly Check0x0000000000000000000000000000000000000B0240,000Check if a transfer is flagged as anomalous
PRISM Consensus Params0x0000000000000000000000000000000000000C011,500Read current PRISM-tuned consensus parameters

Solidity Interfaces​

IQorePQC.sol​

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

interface IQorePQC {
    /// @notice Verify an ML-DSA-87 (Dilithium-5) signature
    /// @param pubkey The 2592-byte ML-DSA-87 public key
    /// @param signature The 4627-byte ML-DSA-87 signature
    /// @param message The original message bytes
    /// @return valid True if the signature is valid
    function pqcVerify(
        bytes calldata pubkey,
        bytes calldata signature,
        bytes calldata message
    ) external view returns (bool valid);

    /// @notice Check if an account has a registered PQC public key
    /// @param account The Ethereum-style address to check
    /// @return registered True if a PQC key is registered
    /// @return algorithmId The PQC algorithm identifier (1 = ML-DSA-87)
    /// @return pubkey The registered public key bytes (empty if not registered)
    function pqcKeyStatus(address account)
        external
        view
        returns (bool registered, uint8 algorithmId, bytes memory pubkey);
}

IQoreAI.sol​

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

interface IQoreAI {
    /// @notice Get the AI-generated risk score for transaction data
    /// @param txData The transaction data to evaluate
    /// @return score Risk score in basis points (0-10000)
    /// @return level Risk level: 0=SAFE, 1=LOW, 2=MEDIUM, 3=HIGH, 4=CRITICAL
    function aiRiskScore(bytes calldata txData)
        external
        view
        returns (uint256 score, uint8 level);

    /// @notice Check if a transfer is flagged as anomalous
    /// @param sender The sender address
    /// @param amount The transfer amount in wei
    /// @return anomalyScore The anomaly score (higher = more anomalous)
    /// @return flagged True if the transfer exceeds the anomaly threshold
    function aiAnomalyCheck(address sender, uint256 amount)
        external
        view
        returns (uint256 anomalyScore, bool flagged);
}

IQoreConsensus.sol​

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

interface IQoreConsensus {
    /// @notice Get current PRISM-tuned consensus parameters
    /// @return blockTime Current target block time in milliseconds
    /// @return baseGasPrice Current base gas price in wei
    /// @return validatorSetSize Current active validator set size
    /// @return epoch Current PRISM epoch number
    function rlConsensusParams()
        external
        view
        returns (
            uint256 blockTime,
            uint256 baseGasPrice,
            uint256 validatorSetSize,
            uint256 epoch
        );
}

Usage Examples​

PQC Verify — Verify a Post-Quantum Signature​

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "./interfaces/IQorePQC.sol";

contract PQCVerifier {
    IQorePQC constant PQC = IQorePQC(0x0000000000000000000000000000000000000A01);

    /// @notice Verify a PQC signature and revert if invalid
    function verifyOrRevert(
        bytes calldata pubkey,
        bytes calldata signature,
        bytes calldata message
    ) external view {
        bool valid = PQC.pqcVerify(pubkey, signature, message);
        require(valid, "PQC signature verification failed");
    }
}

Gas cost: 25,000 base + 8 gas per byte of input data. For a typical ML-DSA-87 verification (2592 + 4627 + message bytes), expect approximately 80,000-90,000 gas.

PQC Key Status — Check Account Registration​

contract PQCChecker {
    IQorePQC constant PQC_STATUS = IQorePQC(0x0000000000000000000000000000000000000A02);

    function requirePQCKey(address account) external view {
        (bool registered, , ) = PQC_STATUS.pqcKeyStatus(account);
        require(registered, "Account must have a registered PQC key");
    }
}

Gas cost: 2,500 flat.

AI Risk Score — Evaluate Transaction Risk​

import "./interfaces/IQoreAI.sol";

contract RiskGate {
    IQoreAI constant AI = IQoreAI(0x0000000000000000000000000000000000000B01);

    uint8 constant MAX_ALLOWED_RISK = 2; // Allow up to MEDIUM

    function executeIfSafe(bytes calldata txData) external {
        (uint256 score, uint8 level) = AI.aiRiskScore(txData);
        require(level <= MAX_ALLOWED_RISK, "Risk level too high");

        // Proceed with execution...
    }
}

Risk levels:

LevelValueScore Range (bps)
SAFE00 - 1000
LOW11001 - 3000
MEDIUM23001 - 6000
HIGH36001 - 8500
CRITICAL48501 - 10000

Gas cost: 50,000 flat.

AI Anomaly Check — Flag Suspicious Transfers​

contract AnomalyGuard {
    IQoreAI constant AI = IQoreAI(0x0000000000000000000000000000000000000B02);

    function safeTransfer(address sender, uint256 amount) external view {
        (uint256 anomalyScore, bool flagged) = AI.aiAnomalyCheck(sender, amount);

        if (flagged) {
            revert("Transfer flagged as anomalous");
        }
    }
}

Gas cost: 40,000 flat.

PRISM Consensus Params — Read Consensus State​

contract ConsensusReader {
    IQoreConsensus constant RL = IQoreConsensus(
        0x0000000000000000000000000000000000000C01
    );

    function getBlockTime() external view returns (uint256) {
        (uint256 blockTime, , , ) = RL.rlConsensusParams();
        return blockTime;
    }

    function getCurrentEpoch() external view returns (uint256) {
        (, , , uint256 epoch) = RL.rlConsensusParams();
        return epoch;
    }
}

Gas cost: 1,500 flat.

CrossVM Bridge — Call CosmWasm from EVM​

interface ICrossVM {
    function call(bytes calldata payload) external returns (bytes memory);
}

contract CrossVMExample {
    ICrossVM constant CROSSVM = ICrossVM(
        0x0000000000000000000000000000000000000901
    );

    function callCosmWasm(
        string memory contractAddr,
        string memory executeMsg
    ) external returns (bytes memory) {
        bytes memory payload = abi.encode(contractAddr, executeMsg, uint256(0));
        return CROSSVM.call(payload);
    }
}

Gas cost: 50,000 base + target contract execution cost. See Cross-VM Interoperability for details.

Interface File Locations​

The Solidity interface files are available in the repository for direct import:

contracts/
  interfaces/
    IQorePQC.sol
    IQoreAI.sol
    IQoreConsensus.sol
    ICrossVM.sol

Install them in your Hardhat or Foundry project:

# Copy interfaces to your project
cp -r contracts/interfaces/ my-project/contracts/interfaces/

Or reference them via import path in your Solidity files:

import "./interfaces/IQorePQC.sol";
import "./interfaces/IQoreAI.sol";
import "./interfaces/IQoreConsensus.sol";

Next Steps​