TLaaS (LEX) — License Issuance & Renewal Functions: Solidity Code, Validations, and Events

1. Purpose

The License Issuance & Renewal functions are core components of TLaaS (LEX), enabling secure creation and controlled lifecycle management of tokenized licenses. These functions must integrate seamlessly with TLAAS (DLA) for validation and DAL for dispute handling.

2. Issuance Logic

Issuance ensures that only authorized Issuers can create licenses, with metadata compliant to the license schema.

Key Steps:

1. Validate issuer permissions via RBAC.
2. Ensure metadata follows TLaaS schema.
3. Mint ERC‑721 or ERC‑1155 token.
4. Store on-chain metadata and link to off-chain IPFS/Arweave data.
5. Emit

3. Renewal Logic

Renewal extends license validity and may require payment or validator approval.

Key Steps:

1. Verify license exists.
2. Validate issuer or authorized renewal role.
3. Check payment or staking requirement.
4. Update expiry date.
5. Emit

4. Solidity Implementation Example

pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";

contract LicenseRegistry is ERC721, AccessControl {
    bytes32 public constant ISSUER_ROLE = keccak256("ISSUER_ROLE");
    
    struct LicenseData {
        uint256 expiry;
        string rightsHash;
    }

    mapping(uint256 => LicenseData) public licenses;

    event LicenseIssued(uint256 indexed licenseId, address indexed issuer, address indexed holder, uint256 expiry);
    event LicenseRenewed(uint256 indexed licenseId, uint256 newExpiry);

    constructor() ERC721("TLaaS License", "TLLEX") {
        _setupRole(DEFAULT_ADMIN_ROLE, msg.sender);
    }

    function issueLicense(address to, uint256 tokenId, uint256 expiry, string memory rightsHash) public onlyRole(ISSUER_ROLE) {
        require(!_exists(tokenId), "License already exists");
        _mint(to, tokenId);
        licenses[tokenId] = LicenseData(expiry, rightsHash);
        emit LicenseIssued(tokenId, msg.sender, to, expiry);
    }

    function renewLicense(uint256 tokenId, uint256 newExpiry) public onlyRole(ISSUER_ROLE) {
        require(_exists(tokenId), "License does not exist");
        require(newExpiry > block.timestamp, "New expiry must be in the future");
        licenses[tokenId].expiry = newExpiry;
        emit LicenseRenewed(tokenId, newExpiry);
    }
}

5. Validations

• Schema Compliance: Rights and restrictions must match TLaaS schema.
• Role Verification: Only approved issuers can issue or renew.
• Expiry Validation: Prevent backdating or illogical expiry times.
• Event Logging: Ensure traceability for compliance audits.

6. Interoperability

• TLAAS (DLA): Confirms license validity post-issuance/renewal.
• DAL: Resolves disputes over incorrect issuance or renewal.
• Smart Compliance: Automates regulatory checks before renewals.

7. Testing & Deployment

• Write unit tests for both issuance and renewal logic.
• Test validator integration via TLAAS.
• Deploy to testnet and simulate real-world marketplace activity.

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