Privacy-preserving identity verification for the real world.

Ghost lets you prove who you are without revealing who you are. Scan your passport, get verified, stay anonymous.

Every time you want to prove your age, nationality, or identity online, you have to hand over your actual data. Your name, passport number, everything stored on some company's server, waiting to be leaked or sold.

That's broken.

Ghost flips the script. You scan your passport locally on your phone. The app extracts what's needed, randomizes the specifics, and generates a cryptographic proof that says "yes, this person is real and meets the criteria" — without revealing anything else.

What gets shared on-chain:

Everything happens offline. Your passport image? Deleted immediately after scanning. The MRZ data? Never leaves your phone. All that goes on-chain is the anonymized proof.

1. Create a wallet — We spin up a Privy wallet for you. No seed phrases to lose, no extensions to install.

2. Scan your passport — Point your camera at the MRZ (the text at the bottom). OCR extracts the data locally.

3. Generate your proof — The app creates a zero-knowledge proof that attests to your identity without revealing it. Approximately 30-60 seconds of local computation.

4. Mint your Ghost NFT — The proof gets submitted to Solana. You receive a soulbound NFT that represents your verified identity. This is your "Ghost" — proof you're a real human without the doxxing.

5. Use it everywhere — Companies can verify you're real just by checking if you hold the NFT. No KYC forms, no data collection, no risk.

Ghost also includes zk-Census — a way for startups, DAOs, and digital communities to measure their population without doxxing members.

Think about it: how does a DAO know its actual demographic distribution? Right now, they don't. Members don't want to share personal info, and there's no way to verify claims even if they did.

With zk-Census:

• Companies create a census with specific criteria (age range, region, etc.)
• Users submit their Ghost proofs to participate
• The census aggregates statistics without linking any data back to individuals
• Result: "We have 1,200 verified humans, 60% are 25-34, spread across 4 continents" — zero personally identifiable information exposed

• iOS — Native SwiftUI app
• Passport Scanning — Vision framework for OCR, CoreNFC for chip reading (when available)
• Wallet — Privy embedded wallets (no MetaMask, no browser extensions)
• Blockchain — Solana (fast, cheap, good mobile SDKs)
• Zero-Knowledge Proofs — Groth16 proofs generated on-device
• Gas Fees — Eliminated via Magic Blocks session keys (users don't pay)

Requirements:

• Xcode 15+
• iOS 16+
• Physical device for NFC passport scanning

• ✅ Passport image deleted immediately after OCR
• ✅ Raw passport data never transmitted anywhere
• ✅ ZK proofs generated entirely on-device
• ✅ Only anonymized, range-based data goes on-chain
• ✅ No central database of identity data
• ✅ Nullifier prevents double-registration without revealing identity

Because once you're verified, you can move through the digital world like a ghost. You're there, you're real, you can interact with services that need to know you're a human but nobody knows which human.

You're anonymous. You're a ghost.

• Active Authentication for NFC passport chips
• Support for ID cards and driver's licenses
• Cross-chain proof verification
• SDK for third-party integration
• Browser extension for web-based verification

Apache 2.0 — see LICENSE for details.