TLaaS (LEX) — Event‑Driven License Lifecycle Management

1. Purpose

Establish the event-driven architecture for managing the full lifecycle of licenses in TLaaS (LEX), ensuring that issuance, renewal, suspension, revocation, and archival are automated, auditable, and interoperable with TLAAS (DLA) for compliance enforcement and DAL for governance oversight.

2. Design Principles

• Reactive Architecture: License state changes triggered by on-chain events, oracle inputs, or governance actions.
• Atomicity: Each state transition is deterministic, validated, and irreversible unless reversed via governance.
• Auditability: All lifecycle events are logged on-chain with cryptographic proof.
• Extensibility: Supports adding new lifecycle stages without redeploying the entire system.

3. Lifecycle Stages

1. Issued: License registered and active.
2. Pending Renewal: Approaching expiration, renewal workflow initiated.
3. Suspended: Temporarily disabled pending compliance investigation.
4. Revoked: Permanently invalidated by governance or DLA enforcement.
5. Archived: Historical record preserved for audit purposes.

4. Event Types

• LicenseIssued
• LicenseRenewalRequested
• LicenseRenewed
• LicenseSuspended
• LicenseRevoked
• LicenseArchived

5. Solidity Implementation Example

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

contract LicenseLifecycleManager {
    enum Status { Issued, PendingRenewal, Suspended, Revoked, Archived }
    
    struct License {
        Status status;
        uint256 issuedAt;
        uint256 expiresAt;
    }
    
    mapping(bytes32 => License) public licenses;
    
    event LicenseIssued(bytes32 indexed licenseId, uint256 issuedAt, uint256 expiresAt);
    event LicenseRenewalRequested(bytes32 indexed licenseId);
    event LicenseRenewed(bytes32 indexed licenseId, uint256 newExpiry);
    event LicenseSuspended(bytes32 indexed licenseId);
    event LicenseRevoked(bytes32 indexed licenseId);
    event LicenseArchived(bytes32 indexed licenseId);
    
    function issueLicense(bytes32 licenseId, uint256 expiry) external {
        licenses[licenseId] = License(Status.Issued, block.timestamp, expiry);
        emit LicenseIssued(licenseId, block.timestamp, expiry);
    }
    
    function requestRenewal(bytes32 licenseId) external {
        licenses[licenseId].status = Status.PendingRenewal;
        emit LicenseRenewalRequested(licenseId);
    }
    
    function renewLicense(bytes32 licenseId, uint256 newExpiry) external {
        licenses[licenseId].status = Status.Issued;
        licenses[licenseId].expiresAt = newExpiry;
        emit LicenseRenewed(licenseId, newExpiry);
    }
    
    function suspendLicense(bytes32 licenseId) external {
        licenses[licenseId].status = Status.Suspended;
        emit LicenseSuspended(licenseId);
    }
    
    function revokeLicense(bytes32 licenseId) external {
        licenses[licenseId].status = Status.Revoked;
        emit LicenseRevoked(licenseId);
    }
    
    function archiveLicense(bytes32 licenseId) external {
        licenses[licenseId].status = Status.Archived;
        emit LicenseArchived(licenseId);
    }
}

6. Off‑Chain Event Processing

• Indexing: Use services like The Graph to index license state transitions.
• Notifications: Integrate with ThrivePush or similar to alert license holders of changes.
• Analytics: Feed lifecycle data into CrownLytics for compliance trend monitoring.

7. Security & Governance

• Only authorized DLA and DAL actors may trigger suspension or revocation.
• Governance can retroactively reverse lifecycle changes via multi-sig proposals.

8. Integration with TLAAS & DAL

• TLAAS (DLA): Automatically suspends or revokes licenses based on compliance results.
• DAL: Oversees rule changes for lifecycle management and approves exceptional actions.

9. Operational Runbook

• Periodically audit lifecycle events for anomalies.
• Test emergency suspension workflows quarterly.
• Maintain off-chain event archives in IPFS/Arweave for redundancy.

10. Acceptance Criteria

• All state transitions emit corresponding events.
• 100% traceability from issuance to archival.
• Zero unauthorized state changes.

Next Article: License State Machine Specification with Formal Verification