What is proof of payment verification?

The short answer

Proof of payment verification is a cryptographic way of showing that a real payment happened, without a human reading your screenshots and without anyone seeing your bank or payment app data. Your own device checks the payment confirmation and produces a small mathematical proof. A smart contract accepts that proof and releases the crypto held in escrow. Nobody has to be trusted, and nobody has to be believed.

The problem it solves

Peer to peer trading has always had one weak point: how does the seller know the money arrived? Traditional marketplaces answered that with screenshots and a support desk. Screenshots are trivial to fake, support desks are slow, and both mean handing your financial life to strangers. Proof of payment replaces the human referee with maths.

How it works in practice

1. The seller's crypto is locked into an on-chain escrow contract when you reserve an order. It cannot be withdrawn while your order is live.
2. You pay the seller in Venmo, Cash App, Zelle, Revolut or Wise, exactly as normal.
3. A verifier running on your own machine opens your payment app session and reads the confirmation page over a secure connection.
4. It generates a zero-knowledge proof that says: a payment of this amount, to this account, on this date, exists. Nothing else about the page is revealed.
5. The escrow contract verifies the proof on-chain and releases the crypto to you.

What the proof actually reveals

Only three facts: the amount, the recipient identifier the order expected, and the timestamp. Your balance, your transaction history, your contacts, your login and your statement never leave your device. The seller sees a valid proof, not your account.

Why this is stronger than a screenshot

• A screenshot can be edited in seconds. A proof cannot be forged without the payment.
• A screenshot needs a person to review it. A proof is checked by a contract in seconds.
• A screenshot shows everything on the page. A proof shows only what the order needs.

Where the verifier runs

On desktop, verification runs inside the Proof Money Verifier browser extension, which is open about exactly what it reads and stores nothing. On Android you can install it in a Chromium browser that supports extensions. On iPhone, extensions are not permitted by the operating system, so you finish verification on a computer. Your crypto stays locked in escrow in the meantime, so nothing is at risk while you switch device.

What happens if verification fails

If the amount or reference does not match the reserved order, the proof will not satisfy the contract and escrow does not release. That is the system working correctly. The fix is almost always to pay the exact figure shown on the order screen, including cents, with the reference provided.

Frequently asked questions