{"type":"video","version":"1.0","html":"<iframe src=\"https://www.loom.com/embed/e6a757cfbf9748fab841fae9ae3bcf45\" frameborder=\"0\" width=\"1366\" height=\"1024\" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>","height":1024,"width":1366,"provider_name":"Loom","provider_url":"https://www.loom.com","thumbnail_height":1024,"thumbnail_width":1366,"thumbnail_url":"https://cdn.loom.com/sessions/thumbnails/e6a757cfbf9748fab841fae9ae3bcf45-73176253a44b0637.gif","duration":108.235,"title":"Chainengineers Digital Twin","description":"ChainEngineers - Solana Embedded Payment Terminal (Digital Twin)\nI built a Solana-powered payment terminal simulator from scratch for the Dev3Pack hackathon.\nThe system is a digital twin of a real embedded POS terminal - built in C with SDL2, communicating with a Node.js backend over raw TCP sockets, and confirming real transactions on Solana Devnet.\nWhat it does:\n\nMerchant enters payment amount in Naira\nSystem converts to SOL automatically\nReal Solana Pay QR code generated and displayed\nCustomer scans with Phantom wallet and pays\nBackend detects transaction on Solana Devnet\nTerminal confirms with real TX signature on screen\n\nTech Stack:\n\nTerminal: C + SDL2 + SDL2_ttf\nNetworking: Raw Winsock2 sockets + SDL threads\nBackend: Node.js + Express\nBlockchain: Solana Devnet\nQR: Nayuki qrcodegen library\n\nPhase 3 Vision - SolaChain Fiat On-Ramp:\nNot every Nigerian customer owns a crypto wallet. Phase 3 introduces dual payment mode - customers pay via Solana QR code OR via a Nigerian bank transfer to a SolaChain virtual account that auto-converts NGN to SOL. The merchant always receives Solana regardless of how the customer pays. Target: 40 million Nigerian micro-merchants currently excluded from digital payments.\nHardware Vision:\nDeploy on ESP32 + TFT display + QR scanner to bring decentralized payments to everyday merchants in emerging markets - no banks, no middlemen, just Solana.\nBuilt solo for Dev3Pack 2025. 🚀"}