Developed cross-network interoperability features for XMTP by integrating Lens Chain support into both the xmtp-js and libxmtp repositories. Leveraged TypeScript and JavaScript to add mainnet and testnet compatibility, configuring HTTP transport for seamless interaction with Lens Protocol networks. Enhanced smart contract verification by enabling EIP-1271 validation for Lens v3 smart accounts, mapping EIP-155 chain IDs to Lens RPC URLs to ensure reliable cross-network verification. Focused on blockchain integration and full stack development, these updates expanded XMTP’s network reach and security posture, delivering tangible business value for Lens interactions while maintaining alignment between chain IDs and network endpoints.