Specimen SheetNo. RP-2026-0006

Aawaj · आवाज

civic issue reporting, tamper-proof and on-chain

Best Beginner Track, winner · Best Hack Built with Antigravity, winner

GitHub

Plate VI

fig. 1. speaking-trumpet, by which a voice carries.

Catalog of Work · R. Poudel, Collector · Lawrence, Kansas

No. RP-2026-0006★ Holotype

Aawaj · आवाज (“voice”)

civic issue reporting, tamper-proof and on-chain

Collected: Midwest Blockathon, 2026
Locality: Midwest, USA
Collectors: R. Poudel et al.
Method: hackathon, weekend build
Substrate: React · Solidity · Polygon Amoy · ethers.js · Pinata IPFS · MetaMask
Status: exhibited

det. Best Beginner Track, winnerdet. Best Hack Built with Antigravity, winner

Field Notes

Aawaj is Nepali for “voice.” The premise comes from watching civic complaints disappear into bureaucracy back home: a pothole gets reported, the report sits in a drawer, and there is no way to prove it was ever filed or who ignored it. We wanted the paper trail itself to be incorruptible.

Reports are written to a smart contract on Polygon Amoy, which makes them permanent and publicly auditable. The interesting design problem was escalation; a report shouldn't just sit on-chain, it should move. We built a five-tier ladder (Ward to Municipality to District to Province to Federal) with on-chain confirmation at each level and dispute logic when a citizen contests a resolution.

Photo evidence is too large and too expensive for the chain, so images go to IPFS via Pinata and the contract stores the content hash. Officials work from a wallet-gated dashboard and authenticate with MetaMask, so their confirmations are themselves on-chain transactions. The audit trail covers the responders too, not just the reporters.

Dissection

A React frontend talks to a Solidity contract on Polygon Amoy via ethers.js. Pinata pins photo evidence to IPFS; the chain stores hashes and the full escalation state machine.

Solidity contract (Polygon Amoy): Stores reports, escalation state, confirmations, and disputes. The 5-tier ladder is a state machine enforced on-chain; escalation rules cannot be bypassed by any party.
React frontend: Citizen-facing reporting flow and public feed. Reads contract state via ethers.js; writing a report is a signed transaction.
Pinata / IPFS: Decentralized photo storage. The contract keeps only content hashes, so evidence is verifiable without bloating chain state.
Wallet-gated dashboard: Government view, authenticated with MetaMask. Official actions (confirm, resolve, respond to dispute) are on-chain transactions tied to a known wallet.

Annotations

ann. 2026. Putting the escalation logic on-chain, not just the reports, was the idea judges responded to. Accountability for the responders, not only a complaint box. · R.P.

ann. 2026. Polygon Amoy testnet kept gas free for the demo. A production version would keep content hashes on-chain and add an indexer for fast feed reads. · R.P.

This sheet is designed to be printed. ⌘P yields a catalog card.