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π CourierChain β Decentralized Peer-to-Peer Courier Marketplace on Solana Submitted to Solana Hackathon 2026 Β· Γanakkale Hub Β· Solana Mobile Track π Live Demo: https://courierchain.vercel.app π» GitHub: https://github.com/sametergucc/courierchain β‘ Network: Solana Devnet ββββββββββββββββββββββββββββββββββββββββββ π― WHAT IS COURIERCHAIN? CourierChain replaces centralized courier services (UPS, FedEx, local dispatchers) with an on-chain peer-to-peer marketplace where: β Senders book verified couriers in seconds via Phantom wallet β SOL is locked in escrow at booking β courier gets paid the moment of delivery β Pickup & delivery are confirmed with QR codes scanned on the courier's phone β Both sides see real-time navigation on a live map β Senders can cancel & get an automatic refund before pickup β Every delivery becomes a verifiable on-chain record β couriers build a portable reputation ββββββββββββββββββββββββββββββββββββββββββ β±οΈ TIMESTAMPS 00:00 β Intro: The problem with centralized courier services 00:30 β How CourierChain works 01:00 β Sender flow: pick A & B, choose courier, escrow SOL 02:00 β QR-verified pickup & delivery handoff 02:45 β Live courier navigation (sender + courier views) 03:30 β Cancel & automatic refund 04:00 β Mobile Wallet Adapter integration (Solana Mobile) 04:45 β Why Solana? Sub-second settlement, sub-cent fees 05:15 β Tech stack & architecture 06:00 β Closing & roadmap ββββββββββββββββββββββββββββββββββββββββββ π οΈ TECH STACK β’ Solana (Devnet) β native SOL transfers for escrow β’ @solana/wallet-adapter-react + Phantom (Mobile Wallet Adapter) β’ Next.js 16 (App Router) + React 19 + TypeScript β’ Upstash Redis β persistent off-chain data β’ Leaflet.js β interactive maps with live navigation β’ html5-qrcode β camera-based QR scanning β’ qrcode.react β pickup/delivery QR generation β’ Vercel β hosting ββββββββββββββββββββββββββββββββββββββββββ π± SOLANA MOBILE INTEGRATION CourierChain uses the Mobile Wallet Adapter (MWA) protocol via @solana/wallet-adapter-phantom. Couriers and senders connect Phantom mobile in one tap, sign multiple delivery transactions across a shift without re-authorizing, and never leave the app context. GPS, camera (QR scanner), and wallet all live in one mobile session β purpose-built for couriers working with one hand on a bike. ββββββββββββββββββββββββββββββββββββββββββ π‘ WHY THIS MATTERS Traditional courier platforms charge 30%+ fees, withhold payments for weeks, and offer no cryptographic proof of delivery. CourierChain settles every delivery in under a second with sub-cent transaction fees β making micro-deliveries (a forgotten key, a coffee, urgent documents) economically viable for the first time. No central dispatcher. No withheld payments. No disputes without evidence. ββββββββββββββββββββββββββββββββββββββββββ π·οΈ HASHTAGS #Solana #SolanaHackathon #SolanaMobile #DePIN #Web3 #Blockchain #Phantom #Crypto #Logistics #SmartContracts #DApp #Devnet #NextJS #React #TypeScript #PeerToPeer #CourierService #BlockchainLogistics ββββββββββββββββββββββββββββββββββββββββββ π© Built by @sametergucc Β· Γanakkale, TΓΌrkiye πΉπ·