Owner: CrownThrive, LLC Date: 2025-08-08 Classification: Internal — Contract Architecture, Modular Components, and On-Chain Logic
1. Purpose
This document defines the complete on-chain architecture for the CHLOM License Exchange’s smart contracts, covering modular design, upgradeability, security constraints, and multi-chain interoperability. The goal is to provide developers with a full blueprint to implement, test, and deploy all smart contract components supporting the License NFT/SFT lifecycle.
2. Contract Structure Overview
- Core License Manager — Handles issuance, renewal, revocation, and transfer of license NFTs/SFTs.
- Compliance Oracle Interface — Connects to off-chain compliance scoring engines and ZKP verifiers.
- Treasury & Fee Router — Collects transaction fees, manages staking rewards, and executes reinvestment strategies.
- Governance Module — Implements DAO-based upgrade paths, parameter changes, and emergency pauses.
- Marketplace Integration Adapter — Facilitates listing and settlement through the LEX marketplace.
3. On-Chain Data Models
- License Struct: Minimal fields for fast verification.
- Mappings:
- Enums:
struct License {
string issuerId;
string licenseType;
string jurisdiction;
uint256 expiryDate;
Status status;
string zkProofHash;
}
4. Key Functions & Logic
- IssueLicense: Validates issuer authority, mints token, anchors proof.
- RenewLicense: Updates expiry, regenerates proof, emits renewal event.
- RevokeLicense: DAO/multisig-initiated revocation with evidence.
- TransferLicense: Checks transferability flag before token transfer.
- QueryCompliance: Pulls latest compliance score from oracle.
5. Upgradeability & Modularity
- Proxy Pattern: OpenZeppelin TransparentUpgradeableProxy.
- Versioning: SemVer tags stored on-chain.
- Modules: Separate contracts for marketplace, compliance, and treasury for isolated upgrades.
6. Security & Audit Controls
- Role-Based Access Control: Issuers, DAO admins, regulators.
- Proof Integrity Checks: Ensure ZKP validity before license issuance.
- Circuit Breakers: Emergency pause for marketplace or issuance functions.
- Audit Plan: Pre-launch audit by 2+ independent firms, plus continuous fuzzing.
7. Multi-Chain & Interop
- Bridges: Native support for EVM ↔ Substrate token transfer.
- Cross-Chain Verification: Merkle proofs for state verification.
- EIP Compliance: EIP-721, EIP-1155, EIP-2981, EIP-712.
8. Developer Notes
- Languages: Solidity for EVM chains, Rust for Substrate.
- Testing: Hardhat + Foundry for EVM, Cargo tests for Substrate.
- Deployment: Staged rollout with testnets (Goerli, Rococo) before mainnet.
This architecture ensures LEX contracts are secure, modular, and future-proof, enabling the DAO to govern upgrades and scale across multiple blockchain environments.