Web3 identity layer where your business card, verified credentials, and tokenized equity all live on one chain — sign up with email, no crypto knowledge needed.
KLIPP — On-Chain Identity for the Real World
The Problem
Physical business cards are dead. But the digital alternatives are worse —
LinkedIn is a resume, not an identity. QR codes link to static PDFs. And if
you want to share verified credentials or equity ownership with someone you
just met, you're back to emailing spreadsheets and Carta PDFs.
Meanwhile, Web3 identity tools require MetaMask, seed phrases, and a computer
science degree. Nobody at a networking event has time for that.
What We Built
KLIPP is a three-layer on-chain identity platform that anyone can use —
no MetaMask, no seed phrase, no crypto knowledge required.
Layer 1 — KLIPP Card (free)
A soulbound NFT identity card on Arbitrum Sepolia. Sign in with your email
or passkey, and your wallet is created automatically in the background.
Mint your card in under 30 seconds. Share it with a QR code or link.
Layer 2 — KLIPP Pro Card
Verified professional credentials attached to your card. Employers and
institutions sign verifiable claims (role, tenure, achievements) using
EIP-712 typed data signatures. No third-party authority — the blockchain
is the verification layer.
Layer 3 — KLIPP Equity Card (built on Robinhood Chain)
Tokenized equity with cliff + linear vesting, deployed on Robinhood Chain
— Arbitrum's dedicated RWA chain. Founders issue equity cards to team
members. Holders see their real-time vesting progress and claim vested
tokens directly from their card view.
The vesting math runs in a Stylus (Rust) smart contract — one of the first
production Stylus deployments on Robinhood Chain. Rust gives 40–90% gas
savings over equivalent Solidity for math-heavy operations like vesting
calculations.
The Technical Stack
- Smart contracts: Solidity (Foundry) + Rust (Stylus SDK)
- Chains: Arbitrum Sepolia (identity) + Robinhood Chain testnet (equity/RWA)
- Embedded wallets: Privy (email + passkey, no MetaMask required)
- Frontend: Next.js 14, Wagmi, Tailwind CSS
- Backend: Supabase (Postgres + Storage + Edge Functions)
- Hosting: Vercel (auto-deploy from GitHub)
- Tests: 37/37 Solidity tests + 17/17 Rust unit tests passing
Why It Wins on the Judging Criteria
Innovation: First product to combine consumer identity cards + verified
credentials + tokenized equity in a single tap-to-share experience.
Technical implementation: Multi-chain architecture (2 chains), Stylus in
Rust, EIP-712 claim signatures, ERC-4337 embedded wallets, soulbound NFTs.
Use of Arbitrum technology: Deployed on Arbitrum Sepolia + Robinhood Chain
(Orbit). Uses Stylus — Arbitrum's newest tech — for production vesting math.
Qualifies for both the Arbitrum and Robinhood Chain reserved prize slots.
Potential impact: Every startup needs a cap table. Every professional needs
identity. KLIPP makes both accessible to people who have never touched crypto.
DEMO: Live demo at klipp-bay.vercel.app — sign up with
email, mint in 30 seconds, no wallet install required.
Try It Live
klipp-bay.vercel.app
Milestone 1: ✅ Complete ✅ 4 smart contracts written and deployed (KLIPPCard, KLIPPProCard, EquityToken, CapTable) — 37/37 Solidity tests passing ✅ Stylus vesting contract in Rust — 17/17 unit tests passing, deployed and verified on Arbitrum Sepolia ✅ All contracts live on Robinhood Chain testnet (chain 46630) ✅ Next.js frontend with Privy embedded wallets — email/passkey sign-in, no MetaMask required ✅ Full mint flow: sign in → upload avatar → mint KLIPPCard on-chain (gasless) ✅ Supabase database, storage, and edge functions connected ✅ Auto-deploy via GitHub → Vercel pipeline Milestone 2: ✅ Complete ✅ Equity Card issue + vesting flow live on Robinhood Chain — 3 grants in 3 vesting states (pre-cliff, linear, fully vested), all reading real-time from the Stylus contract ✅ Stylus vesting contract deployed to Robinhood Chain (0xC9DCf36D...7142) — one of the first Stylus deployments on Robinhood Chain ✅ Pro Card credentials page live ✅ Full README with architecture diagram, contract addresses, and "Why Stylus?" section ✅ Demo video recorded and uploaded ✅ Live and fully functional at klipp-bay.vercel.app Final state: All three identity layers (KLIPP Card, Pro Card, Equity Card) are live, tested, and demonstrable end-to-end. Deployed across Arbitrum Sepolia and Robinhood Chain testnet, qualifying for both reserved prize categories.
Bootstrapped
