FAQ

Does my file get uploaded?

No. The fingerprint is calculated in your browser and only the fingerprint is sent. The file is uploaded only if you choose a Premium stored copy.

What uses credits?

Every action uses 1 credit (US$0.75): registering a file, text or pasted fingerprint, storing a copy, opening a certificate (with its downloads for that visit), saving or checking a crypto wallet, re-checking your saved wallets and running a ledger integrity check. The public ledger list itself is open to everyone.

A single registration with a stored copy can also be paid for once by card (US$0.75) without a credit key.

Do regular buyers get a bonus?

Yes. Your first credit pack gets 10% extra credits, from your 5th purchase you get 20% extra, and from your 20th purchase 50% extra. Purchases are counted by the email you pay with, and the bonus is rounded up to whole credits.

What is a credit key?

A code like FPR-XXXX-XXXX-XXXX that holds your prepaid credits. There is no account: anyone who has the key can spend its credits, so keep it private. If it is used from a new country we email the buyer, and you can freeze it from that email.

Can an entry be deleted or changed?

No. The ledger is append-only and each entry is chained to the one before it, so changing or removing an entry would break the chain and be visible to everyone.

What happens if something is tampered with?

The check shows "Tampering detected" and what changed. The altered data, the expected SHA-256 code, the time and the IP address and browser of the request are saved as evidence. For wallets, a copy of the tampered record is kept and a fresh snapshot is added to the ledger.

What does a wallet proof show?

A snapshot of the wallet's public data (balance, transaction count, time checked) from a public block explorer, with two SHA-256 codes. It proves the saved record wasn't altered. It does not prove who controls the wallet.

How do I verify a certificate without this site?

Download the .tsr token from the certificate page and check it with OpenSSL against the freetsa.org certificates. The certificate page shows the exact command.