TLaaS (LEX) — Off‑Chain Compute Oracles for Advanced Compliance Checking

1. Purpose

Define the architecture, execution model, and integration flows for off‑chain compute oracles in TLaaS (LEX) to handle compliance checks that are too computationally expensive, data‑intensive, or jurisdictionally dynamic for on‑chain execution. Maintain interoperability with TLAAS (DLA) for automated enforcement and DAL for governance‑driven rulesets.

2. Design Principles

• Compute Efficiency: Shift heavy compliance logic off‑chain while preserving on‑chain verifiability.
• Data Privacy: Ensure sensitive datasets remain encrypted and processed in secure environments.
• Cryptographic Attestation: All off‑chain results must be signed and verifiable on‑chain.
• Governance Adaptability: DAL must be able to upgrade or replace oracle logic via governance proposals.

3. Oracle Types

• KYC/AML Compliance Oracle: Verifies user identity and anti‑money‑laundering compliance.
• Jurisdictional Rules Oracle: Applies location‑specific licensing laws.
• Market Activity Oracle: Checks secondary market activity for compliance violations.

4. Workflow Architecture

1. Trigger: TLaaS contract emits
2. Oracle Listener: Off‑chain service subscribes to events and fetches necessary data.
3. Secure Processing: Compute logic runs inside a Trusted Execution Environment (TEE) or MPC cluster.
4. Attestation: Results are signed using oracle private key.
5. On‑Chain Submission: Signed results posted back to TLaaS contract.

5. Solidity Integration Example

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

contract ComplianceOracleConsumer {
    address public oracle;
    mapping(bytes32 => bool) public complianceResults;

    event ComplianceCheckRequested(bytes32 indexed licenseId);
    event ComplianceResultReceived(bytes32 indexed licenseId, bool compliant);

    modifier onlyOracle() {
        require(msg.sender == oracle, "Not authorized");
        _;
    }

    function requestComplianceCheck(bytes32 licenseId) external {
        emit ComplianceCheckRequested(licenseId);
    }

    function submitComplianceResult(bytes32 licenseId, bool compliant) external onlyOracle {
        complianceResults[licenseId] = compliant;
        emit ComplianceResultReceived(licenseId, compliant);
    }

    function setOracle(address _oracle) external {
        oracle = _oracle;
    }
}

6. Off‑Chain Implementation (Node.js + Ethers.js)

import { ethers } from "ethers";
import fetch from "node-fetch";

const provider = new ethers.JsonRpcProvider(process.env.RPC_URL);
const contract = new ethers.Contract(process.env.CONTRACT_ADDR, ABI, provider);

contract.on("ComplianceCheckRequested", async (licenseId) => {
  const compliant = await runComplianceLogic(licenseId);
  const tx = await contract.connect(wallet).submitComplianceResult(licenseId, compliant);
  await tx.wait();
});

async function runComplianceLogic(licenseId) {
  // Fetch off‑chain datasets, run checks
  const data = await fetchComplianceData(licenseId);
  return evaluateRules(data);
}

7. Security Considerations

• Use TEEs like Intel SGX or AWS Nitro Enclaves for execution.
• Require multi‑oracle consensus for high‑risk checks.
• Implement slashing mechanisms for malicious oracles.

8. Integration with TLAAS & DAL

• TLAAS (DLA): Consumes oracle output before license issuance/renewal.
• DAL: Proposes and votes on compliance rule changes that oracles enforce.

9. Operational Runbook

• Rotate oracle signing keys quarterly.
• Monitor oracle performance and uptime.
• Maintain redundancy with multiple independent oracle providers.

10. Acceptance Criteria

• Oracle response time ≤ 5 seconds.
• All submissions cryptographically signed and verifiable.
• Oracles meet uptime SLA ≥ 99.9%.

Next Article: Event‑Driven License Lifecycle Management