Cross-Chain SMS

Enterprise Cross-Chain Messaging System — Detailed Overview Project Overview Enterprise-grade cross-chain messaging POC that combines Bloxchain security workflows with routing between EIL native bridges and LayerZero v2. Focuses on message-only transfers (no tokens) to demonstrate routing and security. Core Architecture Three-Layer System Security layer (Bloxchain) SecureOwnable: Multi-signature workflows, time-locked operations, role-based access (Owner, Broadcaster, Recovery) StateAbstraction: Transaction state machine (PENDING → APPROVED → EXECUTED) 5-minute time delay for all message sends Meta-transaction support: owner signs off-chain, broadcaster executes and pays gas Routing layer (HybridOrchestrationRouter) Analyzes MessageRequirements to choose EIL native bridges or LayerZero Supports Arbitrum Sepolia (EIL) and LayerZero for broader coverage Chain registry maps chain IDs to LayerZero endpoint IDs Messaging layer (EnterpriseCrossChainMessenger) Message lifecycle: PENDING → DELIVERED → PROCESSED Bidirectional messaging Private message storage (only destination chain owner can view) Fee management (broadcaster pays routing fees) Smart Routing Logic The system routes based on these priorities: Priority 1: Security Requirements requiresNativeSecurity = true → EIL Native (if chain supported) requiresDisputeResolution = true → EIL Native securityLevel == CRITICAL → EIL Native (if delay acceptable) Priority 2: Speed Requirements requiresFastFinality = true → LayerZero requiresGuaranteedDelivery = true → LayerZero Priority 3: Operational Requirements isMultiChain = true → LayerZero isCostSensitive = true + maxDelay >= 7 days → EIL Native Priority 4: Chain Support Chain not supported by native bridge → LayerZero Key Features Security Features Time-locked operations: 5-minute delay before execution Multi-signature workflow: owner requests, broadcaster approves Meta-transactions: gasless experience for owners Access control: owner-only request/cancel, broadcaster-only approval Message privacy: private storage, destination-owner-only viewing Routing Features Automatic protocol selection based on requirements Cost optimization: EIL for cost-sensitive, delay-tolerant operations Speed optimization: LayerZero for time-sensitive operations Security optimization: EIL for high-security, delay-tolerant operations Universal coverage: LayerZero for unsupported chains Message Features Unique message IDs with counter-based generation Complete lifecycle tracking Protocol tracking (EIL vs LayerZero) Bidirectional messaging support Idempotent message delivery Technical Implementation Contracts EnterpriseCrossChainMessenger (UUPS upgradeable) Inherits SecureOwnable and UUPSUpgradeable Manages message lifecycle and security workflows Integrates with router for cross-chain delivery HybridOrchestrationRouter (LayerZero OApp) Extends LayerZero's OApp for cross-chain messaging Manages EIL bridge connectors Implements routing decision logic ChainRegistry (Ownable) Maps chain IDs to LayerZero endpoint IDs Owner-controlled chain registration MessageRequirements (Library) Defines routing decision parameters Helper functions for common requirement patterns MessengerDefinitions (Library) Bloxchain function schemas Role permission matrix Operation type definitions Workflow Owner requests message Calls sendMessageRequest() with target chain, payload, and requirements Transaction enters 5-minute time delay (PENDING) Owner signs meta-transaction (optional) Generates unsigned meta-transaction via contract Signs with EIP-712 Stores signed meta-transaction Broadcaster approves Calls approveMessageWithMetaTx() with signed meta-transaction Pays routing fee (ETH) Contract verifies signature and time delay Transaction moves to execution Router routes message Analyzes requirements Routes via EIL native bridge or LayerZero Forwards to destination chain Destination receives message Router calls handleIncomingMessage() on destination messenger Message stored with DELIVERED status Only destination owner can view Deployment Status Testnet Deployment (Sepolia & Arbitrum Sepolia) EIL Bridge Connectors: L1ArbitrumBridgeConnector (Ethereum Sepolia): 0x2Efeb9A8aa5d20D50f05Be721cCb64332dE2A6a2 L2ArbitrumBridgeConnector (Arbitrum Sepolia): 0xDFa250f671A60B64dD3cD625AD2056b9B4A9124F Hackathon Contracts: ChainRegistry, HybridOrchestrationRouter, EnterpriseCrossChainMessenger deployed on both chains LayerZero peer addresses configured Contracts initialized with owner, broadcaster, and recovery addresses Testing Infrastructure Sanity Tests Message Cancellation Tests Owner requests message Verifies 5-minute time delay Owner cancels before expiration Lists pending transactions with time remaining Meta-Transaction Approval Tests Owner requests message Owner cancels previous message Owner requests new message Owner signs meta-transaction with SIGN_META_APPROVE (action 4) Broadcaster executes with EXECUTE_META_APPROVE (action 7) Verifies message sent successfully Use Cases Cost-sensitive operations Large transfers that can tolerate 7-day delay Use EIL native bridges for lower fees Time-sensitive operations Real-time messaging requiring fast finality Use LayerZero for guaranteed delivery Security-sensitive operations High-value transfers requiring native bridge security Use EIL with dispute resolution Multi-chain operations Messages spanning multiple chains Use LayerZero for universal coverage Current Status Contracts deployed and initialized on testnets Routing logic implemented and tested Security workflows functional (cancellation tests passing) Meta-transaction signing working (EIP-712 integration complete) Meta-transaction execution in progress (contract validation being debugged) Future Enhancements Token transfer support (currently message-only) Additional chain support (Optimism, Polygon, etc.) Advanced routing algorithms Fee estimation and optimization Message retry mechanisms Enhanced error handling and recovery This POC demonstrates enterprise-grade cross-chain messaging with security workflows and intelligent routing, suitable for hackathon demonstration and future production development.

Deep-dived into EIL and LayerZero contract code to integrate native bridges and LayerZero v2. Built a hybrid router that analyzes message requirements (cost, speed, security) to route via EIL native bridges (Arbitrum) or LayerZero. Integrated Bloxchain's SecureOwnable for time-locked, multi-sig workflows. Deployed EIL bridge connectors on testnets and configured LayerZero OApp peers. The messenger uses meta-transactions so owners sign off-chain and broadcasters pay gas, enabling a gasless UX with enterprise security.