The problem Zero Waste Delhi solves

In urban environments, waste management is still largely manual, inefficient, and lacks citizen engagement.

🚯 Bins today are "dumb" – they don’t track what is being dumped or by whom.

🎯 There's no incentive for people to practice proper waste habits.

📊 Municipalities don’t have access to real-time data for informed decision-making or resource allocation.

Zero Waste Delhi solves this by:

• Deploying smart bins that track waste quantity via IoT sensors.

• Storing every waste disposal event securely on the blockchain for transparency.

• Rewarding responsible citizens with eco-tokens, points, or collectibles.

• Introducing a gamified leaderboard to make sustainability fun, competitive, and rewarding.

• Providing municipalities with live dashboards and data for smarter waste planning.

Challenges I ran into

**While building Zero Waste Delhi, we ran into a few significant hurdles:
**
1. IoT Data Integration with Blockchain
Bridging real-world waste weight data from smart bins into the blockchain in real-time was tricky.
We solved this by using a Node.js middleware server to validate and push data to a smart contract on the Lisk Sepolia Testnet.

2. Fair Reward System Design
Designing a non-abusable token reward system was challenging.
We built a cooldown mechanism and per-user threshold to avoid misuse and spam entries.

3. Gas Optimization
Since Lisk is an Ethereum L2, we had to be efficient with how often smart contracts were called.
We optimized by batching multiple entries and calling contracts only when necessary.

4. Frontend ↔ Blockchain Sync
Ensuring that UI always reflected blockchain updates in near real-time took effort.
We used event listeners and polling to sync frontend state with the contract status.

Through continuous testing, debugging, and feedback, we were able to overcome these and ship a stable MVP.