Check a file
Always free
$0no account, no credit
Verify a file against a proof you already hold.
- Drop a file or paste a SHA-256 digest
- No sign-up and nothing to install
- Checking does not spend a credit
◈ Pricing
Checking is free.Anchoring is one-time.
No subscriptions. Buy credit packs with an account and use them whenever you need — credits never expire.
Choose how to use Quantum Notary
One anchor without an account
Checking the current server offer…
Open an account
Credits
$0.16per anchor, at 500 credits
One-time packs. Credits never expire and there is no subscription.
- Records list with search, filters, sort and pagination
- Down to $0.16 per anchor at 500 credits
▸ Credit packs
Buy more at once, pay less per anchor.
One-time payment
$14.99
50 credits · $0.30 per anchor
save 66%
against buying one credit at a time- Anchors included
- 50
- Price per anchor
- $0.30/ea
- Expiry
- never
- Subscription
- none
- Verifying a file
- free
Price per anchor
From $0.89 at one credit down to $0.16 at 500 — an 82% drop.
◇ FAQ
Questions about paying.
Do credits expire?
No. Credits you buy never expire and there's no overage to worry about — when you run out, buy another pack whenever you need to.
Do I need to know cryptography or blockchain?
No. Drop a file or paste its hash in your dashboard — we handle the hashing, the chain submission, and the receipt. No coding required.
Is my file uploaded to you?
The browser file flow hashes exact bytes locally and sends the digest plus selected metadata, not the file contents. File content always remains private.
What if Quantum Notary disappears?
A verifier can recompute the digest and inspect the referenced Base transaction without our API or database. That path still requires the retained input, processing rule, and receipt, and suitable historical Base access.