W3B2-Solana: The Secure Bridge for Web2 Services on Solana. W3B2-Solana is a Rust toolkit for bringing existing backends to Solana. We eliminate your public API to remove the attack surface for web vulnerabilities. Your service operates on a "blockchain-first" model, reacting only to on-chain verified events streamed via a language-agnostic gRPC gateway. For high-throughput tasks (AI, gaming), use our "secure handshake" protocol to establish fast, off-chain channels initiated by a secure on-chain transaction. The system is non-custodial and supports flexible off-chain oracles. A one-command Docker Compose setup deploys a full local dev environment (validator + contract) in minutes. It's the easiest way to get your Web2 service on-chain without a complex migration.