Loops House
Date
Sep 11–13, 2026
Duration
48h
Participants
36
Road To Devcon - IV
Onchain Identity
India’s true strength has never been a single, rigid template. It is a vibrant tapestry woven from distinct identities, the warmth of Punjabi hospitality, the rich traditions of Maharashtra, the ancient heritage of the South, and the unique cultural landscapes of the North East. Each region carries its own proud lineage, local customs, and trusted community bonds.
In the digital era, Onchain Identity acts as a modern self-sovereign seal, a decentralized way to declare your identity.
This week you will build on Onchain Identity solutions.
FAQ
Frequently asked questions
How does scoring work?
Submissions are scored by an AI judge against each problem's judging criteria. Your best problem score becomes your battle score, and ratings update once results are finalized.
Can I work in a team?
No, this is a solo build battle.
What do I need to submit?
A GitHub repository with your working project. You can keep updating your submission until the build window closes.
Final leaderboard
1 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
One benefit application per human per cycle: Anon Aadhaar ZK proofs verified server-side, nullifier ledger in SQLite, volunteer dashboard. The office never holds an Aadhaar number.
6 commits1 contributorlast push Sep 11
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
Road To Devcon IV — Anon Aadhaar ZK intake: one application per person per cycle, no Aadhaar number held (Next.js, SQLite, Solidity)
1 commits1 contributorlast push Sep 12
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
1 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
1 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
15 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
4 commits1 contributorlast push Sep 12
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
1 commits1 contributorlast push Sep 11
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
Privacy-preserving grant application flow using Anon Aadhaar ZK proofs — nullifier-based one-claim-per-cycle enforcement, server-side verification, no Aadhaar data ever stored — Road to Devcon IV, Problem 1
1 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
1 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
2 commits1 contributorlast push Sep 11
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
Privacy-preserving education grant platform using zero-knowledge Aadhaar proofs to verify eligibility without exposing identity.
4 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
1 commits1 contributorlast push Sep 13
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
Privacy-preserving grant applications with Anon Aadhaar ZK proofs, server-side verification, and one-application-per-person-per-cycle enforcement.
4 commits2 contributorslast push Sep 12
Log In With a Wallet, Trust Only the SignatureNobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
Secure Sign-In with Ethereum (SIWE) authentication with server-verified wallet identity, encrypted sessions, nonce-based replay protection, and role-based authorization.
12 commits1 contributorlast push Sep 13
CollabCode is a real-time collaborative code editor that enables multiple users to write and edit code simultaneously in shared rooms. Built with Spring Boot, WebSockets, MongoDB, and Next.js, it provides instant code synchronization and persistent room management
27 commits1 contributorlast push May 29
Nobody Needs Your Aadhaar NumberA Seal of Belonging for Every Chaupal
One benefit application per human per cycle: Anon Aadhaar ZK proofs verified server-side, nullifier ledger in SQLite, volunteer dashboard. The office never holds an Aadhaar number.
6 commits1 contributorlast push Sep 11
1 commits1 contributorlast push Sep 13
Road To Devcon IV — Anon Aadhaar ZK intake: one application per person per cycle, no Aadhaar number held (Next.js, SQLite, Solidity)
1 commits1 contributorlast push Sep 12
1 commits1 contributorlast push Sep 13
Privacy-preserving grant application flow using Anon Aadhaar ZK proofs — nullifier-based one-claim-per-cycle enforcement, server-side verification, no Aadhaar data ever stored — Road to Devcon IV, Problem 1
1 commits1 contributorlast push Sep 13
4 commits1 contributorlast push Sep 12
Privacy-preserving education grant platform using zero-knowledge Aadhaar proofs to verify eligibility without exposing identity.
4 commits1 contributorlast push Sep 13
1 commits1 contributorlast push Sep 13
15 commits1 contributorlast push Sep 13
1 commits1 contributorlast push Sep 11
1 commits1 contributorlast push Sep 13
2 commits1 contributorlast push Sep 11
1 commits1 contributorlast push Sep 13
Privacy-preserving grant applications with Anon Aadhaar ZK proofs, server-side verification, and one-application-per-person-per-cycle enforcement.
4 commits2 contributorslast push Sep 12
CollabCode is a real-time collaborative code editor that enables multiple users to write and edit code simultaneously in shared rooms. Built with Spring Boot, WebSockets, MongoDB, and Next.js, it provides instant code synchronization and persistent room management
27 commits1 contributorlast push May 29
No submission made for this problem.
1 commits1 contributorlast push Sep 13
2 commits1 contributorlast push Sep 13
3 commits1 contributorlast push Sep 13
Kitaab Bazaar seller login with Sign-In With Ethereum: server-issued single-use nonces, full EIP-4361 checks, ERC-1271/6492 smart accounts, iron-session
3 commits1 contributorlast push Sep 11
Road To Devcon IV — SIWE seller sign-in for a second-hand textbook marketplace (Next.js, viem, ERC-1271/6492)
1 commits1 contributorlast push Sep 12
1 commits1 contributorlast push Sep 12
12 commits1 contributorlast push Sep 13
1 commits1 contributorlast push Sep 13
3 commits1 contributorlast push Sep 12
EIP-4361 (SIWE) wallet sign-in with server-side signature verification, atomic single-use nonces, EOA + ERC-1271 smart-account support, session-scoped seller dashboard — Road to Devcon IV, Problem 2
1 commits1 contributorlast push Sep 13
4 commits1 contributorlast push Sep 11
Secure Sign-In with Ethereum (SIWE) authentication with server-verified wallet identity, encrypted sessions, nonce-based replay protection, and role-based authorization.
12 commits1 contributorlast push Sep 13
### Repository Description Secure wallet-based authentication for Kitaab Bazaar using SIWE (EIP-4361), with server-side nonce protection, EOA & ERC-1271 smart-account verification, secure sessions, and seller-only authorization.
3 commits1 contributorlast push Sep 12
No submission made for this problem.
2 commits1 contributorlast push Sep 13
Road To Devcon IV — twelve community groups, salted Merkle roots, soulbound membership seals (Solidity, OZ, Next.js)
1 commits1 contributorlast push Sep 12
3 commits1 contributorlast push Sep 13
1 commits1 contributorlast push Sep 11
Merkle-root membership seals for twelve independent community groups: steward-owned roots, in-browser trees, soulbound claims.
2 commits1 contributorlast push Sep 11
1 commits1 contributorlast push Sep 13
A Seal of Belonging for Every Chaupal: Sovereign Merkle-tree membership seals, on-chain SVG generative art, zero member roll leaks, and cryptographic gated community perks.
1 commits1 contributorlast push Sep 13
15 commits1 contributorlast push Sep 13
4 commits1 contributorlast push Sep 13
Soulbound membership seals via Merkle-proof verification — per-group steward-controlled roots, msg.sender-derived leaves, one-claim-per-member on-chain enforcement, non-transferable NFTs — Road to Devcon IV, Problem 3
8 commits2 contributorslast push Sep 13
Chaupal is a privacy-preserving community membership platform where independent communities can publish Merkle roots of their private member lists and let members cryptographically prove membership without exposing the underlying list
4 commits2 contributorslast push Sep 13
1 commits1 contributorlast push Sep 12
3 commits1 contributorlast push Sep 13
Privacy-preserving community membership verification on Ethereum. Prove you belong — without opening the cupboard.
24 commits1 contributorlast push Sep 13
No submission made for this problem.