On-device biometrics
Face detection and embeddings run entirely in your browser. Your photos are never uploaded to a server.
1
Send a payment
Send money to a face — they unlock it with theirs
Connect your wallet, send funds to a face, and share the claim link — the recipient opens it on their own phone and unlocks with a live face scan. Live on Robinhood Chain mainnet — real payments.
1
Recipient's face
No face detected
Snap or upload the recipient's photo
Use the camera below, or drop a file — stays on your devicePoint the camera at the recipient.
Connect your wallet to send or unlock a face-locked payment.
You're sending. Snap or upload the recipient's photo and choose an amount — only their live face will be able to unlock it. Only a commitment goes on-chain, never the photo.
Payment sent · Lock #--
Share this link with the recipient. They open it, scan their face, and enter the claim code to unlock the funds.
🔑 Claim code
Give this to the recipient separately from the link — both are needed to claim.
Scan to open on their phone
You've been sent a payment · Lock #--
Enter the claim code the sender gave you, then scan your face — blink or turn your head — and the contract verifies it on-chain before releasing the funds. Your photo never leaves your device.
Processing transaction…
✓
Unlocked ✓
The contract matched your live face to the locked reference on-chain and released the funds. (Zero-knowledge privacy is on the roadmap.)
View transaction on Blockscout ↗
2
Your live selfie
No face detected
Use the camera below, or drop a selfie to upload
Live capture recommendedStarting camera…
Receive
Get paid to your wallet
Show this to anyone to receive funds on Robinhood Chain — they scan the QR or copy your address. Funds land in your own wallet; Prompt never holds them.
Connect your wallet to show your receive code and balance.
Your balance
— ETH
Scan to pay you
🔗 Your shareable pay link — anyone can open it to pay you
Received funds are yours — non-custodial. Use “Send out” to move them anywhere.
Send out
Move funds to any wallet
Got funds in your wallet? Send them anywhere — an exchange, a friend, or your own address. A plain transfer on Robinhood Chain, straight from your connected wallet.
View transaction on Blockscout ↗
Non-custodial — Prompt never touches your funds. To cash out to a bank, bridge to Ethereum and sell on an exchange (fiat off-ramp is on the roadmap).
Your sends
Payments you've locked
Every payment you've locked to a face, and whether it's been claimed. Sent to someone but never claimed? You can reclaim it after 30 days — the funds are never stuck.
Connect your wallet to see the payments you've sent.
Locked payments
Status updates live from Robinhood Chain. “Refundable” means 30 days passed with no claim — reclaim it to your wallet anytime after that.
Activity
Everything, in one place
Every move this wallet made on Prompt — face-locks, claims, refunds, and plain sends & receives — read live from Robinhood Chain. Nothing stored by us; it's all public on-chain.
Connect your wallet to see your full activity.
Recent activity
Escrow flows (locks, claims, refunds) come from on-chain events; plain sends & receives from the block explorer. Read-only — Prompt never holds your funds.
2
How it works
Four steps, all private by design
1
Detect
face-api.js finds and crops the face right in your browser. The image never leaves your device.
2
Embed
A neural network (TensorFlow.js) turns the face into a numeric embedding — locally, on your device.
3
Compare
The circuit measures the Euclidean distance between the two embeddings to decide if it's the same person.
4
Prove Live on-chain
A Groth16 zk-SNARK proves the match and unlocks the funds on-chain — without revealing any biometrics.
3
Security
Built like a wallet should be
You hold the keys, your biometrics stay on your device, and the chain only ever sees a proof.
Zero-knowledge proofs
A Groth16 zk-SNARK proves a face match on-chain. The blockchain sees a proof and a commitment — never your face.
Non-custodial
Connect your own wallet and sign every transaction yourself. Prompt never holds your keys or your funds.
Testnet preview — running on Robinhood Chain testnet. Client-side capture is a UX gate, not anti-spoofing; an independent review precedes mainnet.
4
Roadmap
From face-locked payments to fully private
What runs on Robinhood Chain today, and where Prompt is headed.
Live
Now · mainnet
Face-locked payments
- Send crypto to a face on Robinhood Chain
- On-chain face match — the wrong face reverts
- On-device biometrics, non-custodial escrow
Next
In build
Zero-knowledge privacy & liveness
- Groth16 proofs — embeddings never revealed on-chain
- Liveness detection to block photos & deepfakes
- Gasless claims so recipients need no ETH
Next
Robinhood Chain
Send stocks to a face
- Lock tokenized stocks — TSLA, AMZN, NFLX — not just crypto
- Same face-match escrow, extended to ERC-20 stock tokens
- Recipient unlocks the shares with a live face scan
Later
Planned
Hardening & scale
- Security audit & larger-value payments
- Stealth-address, wallet-free claim onboarding
- Payment links, group & recurring transfers
🔬 Technical Biometric Debug
Waiting for images...
Euclidean Distance (Full 128-dim)
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CNN Prediction Match (10x10)
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Likeness Score
0%
Match Threshold (dist²)
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Calibrated Witness Offset
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Calibration Scan
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Active Runtime Config
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