Prove it existed.
Without ever uploading it.
Capture a photo or file. 1SatSnap™ creates a unique cryptographic fingerprint and anchors it to Bitcoin. Your original file stays with you.
Bitcoin secured
Watch a file become a proof.
Four stations, start to finish. Only the fingerprint ever leaves your device.
- 01Captured
Your photo, video or file, on your device.
- 02Fingerprinted
A one-way SHA-256 fingerprint, computed right there.
- 03Recorded
The fingerprint joins a block on Bitcoin.
- 04Verifiable
Anyone with the file can check it, forever.
Seeing isn't believing anymore.
1SatSnap puts a timestamped fingerprint of your photo on Bitcoin. So you can prove when it existed.
- Snap
Take a photo or select a file.
- Fingerprint
1SatSnap creates a unique SHA-256 fingerprint.
- Record
The fingerprint is anchored to Bitcoin.
- Verify
Anyone can independently verify the proof.
We don't need your file. We only need its fingerprint.
- Private by design
- No wallet required
- Bitcoin secured
A later fake can't claim an earlier date
Something generated today cannot be given a place in a block mined last year. Stamp the original, and anything produced afterwards is provably afterwards.
Tampering shows immediately
Alter one pixel, one word, one frame, and the fingerprint changes completely. An edited copy doesn't quietly fail — it fails loudly, and anyone can see it.
Digital content needs a history
Not a score guessing whether something looks real, but a record of when it appeared and whether it has changed. A fact, rather than an opinion.
Your file never leaves you.
There is no upload step, because there is nothing to upload. The fingerprint is computed on your own device, and that is all we ever see.
Stays on your device. Never sent, never copied, never stored by us.
32 bytes and a block height. Nothing that can be turned back into your file.
SHA-256 is a one-way street — it identifies a file precisely and reveals nothing about what is in it.
Snap. Fingerprint. Record. Verify.
Four steps. You do the first one; the rest take care of themselves.
Snap
Capture a photo, record up to two minutes of video, or select files already on your device.
Fingerprint
Your browser computes a SHA-256 fingerprint. The file itself never moves.
Record
The fingerprint is anchored to Bitcoin, where the record is public and outside our reach.
Verify
Anyone with the file can confirm the proof independently, in their own browser.
What can you prove?
Anything that is a file, and anything where the date is the point.
The moment matters.
Now you can prove it.
A photograph isn't just a file. It's a record that something happened, at a particular moment. Until now there was no way to show that the record came first.
Built on Bitcoin.
You never have to think about any of this. It is here because the people who check your proof may want to.
SHA-256
Your file becomes a unique cryptographic fingerprint.
Bitcoin
The fingerprint is anchored to the blockchain, where we cannot alter it.
Merkle proofs
Thousands of records verified from one transaction.
No wallet
No coins, no seed phrase, no crypto knowledge.
No upload
The original file never leaves your device.
Anyone can verify
Anyone with the file can confirm the proof independently, in their own browser.
Why Bitcoin?
Not because you need Bitcoin. Because a proof is only as good as the thing holding it — and that should not be us.
- We don't control the ledger.
- We don't control the timestamp.
- We don't control your file.
We create the proof. Bitcoin preserves it.
What a proof says, and what it doesn't.
A claim that collapses under scrutiny is worse than no claim — and scrutiny is the entire point of this product.
● It proves
- This exact file existed no later than a specific Bitcoin block.
- It has not changed by one byte since. A single extra space fails the check.
- Both facts are confirmable by anyone, from the file alone, without asking us.
● It does not prove
- Who made the file, or who stamped it.
- That what the file shows is true — a real camera can be pointed at a staged scene.
- That the file still exists. Keep it; lose it and the proof describes nothing.
The things people ask first
Is it really free?
Yes, with no paid tier holding features back. One anchor carries thousands of proofs for a fraction of a cent, so one more user costs almost nothing. Free is what the architecture allows, not charity.
What do you actually receive?
A 64-character hash, the filename you chose, and an anonymous key your browser generated. No account, no email, no file.
Does this detect AI-generated images?
No, and be wary of anything claiming to. Detectors guess, and generators improve faster than detectors do.
What this gives you is the fact underneath: a file with a blockchain timestamp existed at that moment and has not changed since. A fake produced later cannot be given an earlier block.
Do I need a wallet or any cryptocurrency?
No. No wallet, no coins, no exchange, no seed phrase, no extension. We pay the transaction fee. The blockchain is plumbing you never have to see.
What if 1SatSnap disappears?
Export a proof file and keep it with the document. It holds everything a verifier needs. We tested this by switching our own server off and verifying anyway.
How long until it is confirmed?
The link works immediately and the chain has it within a minute. A block averages ten minutes; twenty to forty is normal. That is Bitcoin's pace and nobody can hurry it.
Can I prove a whole folder at once?
Yes. Select as many files as you like — they are fingerprinted on your device and recorded together. Four hundred documents is one operation.
Does a messaging-app copy still verify?
No, and that is correct. Messaging apps re-compress, which changes the bytes and so the fingerprint. Always send the original.
Free for people. Built for teams.
One anchor carries thousands of proofs, so serving one more person costs us almost nothing. That is why the app is free, and why it stays free rather than becoming a trial. What a firm pays for is what a firm needs and a person does not — an API, its own branding, and commitments in writing.
No account, no card, no catch
- Photos, video and any file
- Whole folders in one go
- Proof links, proof files and certificates
- Group a job or a matter into cases
- Independent verification, for anyone, forever
For firms and software putting proof into their own work
- API access for your own systems
- High-volume and scheduled stamping
- Certificates under your own brand and domain
- Written retention commitment for proof data
- Self-hosted verification, and an SLA where it is needed
- A named person to email
Tell us what you need to prove.
Commercial use, integrations, volume, or a question about how any of this works. A person reads these. If you are using the free app and something is wrong, say so here too — that is worth more to us than a sales enquiry.
We ask for an email so we can reply, and nothing else is required. What you send is stored so it cannot be lost, and is not passed on.
Prove your next moment.
Your file stays private. Your proof stays checkable by anyone.
Free to use. No wallet. No upload. No crypto experience required.