Koilen

Problem Statement

Koilen is an intelligent cold-chain monitoring system that uses wireless IoT sensors to track temperature and humidity in real time and stores every reading on the blockchain for tamper-proof traceability. The platform provides instant alerts when conditions go out of range, a dashboard to visualize sensor data across sites, and automated compliance reports verified on-chain. Our goal is to bring mission-critical reliability—previously accessible only through expensive industrial systems—to food, pharma, logistics, and data-center operators through an affordable, transparent, and auditable solution.

Solution

Dual EVVM Deployment - Complete ecosystem mastery through two parallel implementations:Custom EVVM (ID 1074) - Built entire infrastructure from scratch: EVVM contract via official factory → Custom NameService → KoilenService. Registered in EVVM Registry. Demonstrates blockchain-within-blockchain architecture. 2. MATE Metaprotocol (ID 2) - Integrated with official EVVM ecosystem. Production-ready, Fisher gasless transaction ready.Tech Stack: Solidity 0.8.30 + Foundry + Next.js 15/16 + TypeScript + Wagmi v2 + RainbowKit + ViemSmart Contracts: Hierarchical structure (Client→Branch→Sensor), variable KOIL economics (0-5 KOIL/event), dual NameService support via constructor injection.Notable Hacks: 5-layer RPC fallback for 99%+ deployment success Temperature encoding: -5°C = BigInt(-5000000) for int256 compatibilityDual NameService: Same codebase works with MATE + Custom via address swap Auto event detection: Frontend calculates costs before transactionFrontends: EVVM Signature Constructor + Koilen Dashboard. Real-time event type detection, color-coded UI, RainbowKit integration. Verified contracts on Etherscan. 8 documentation guides. Production-ready IoT monitoring.