Proof of existence
Timestamp any file with @beat — free and public. Your file never leaves your device; only its SHA-256 is recorded. Later, prove the document existed at that moment.
Your timestamp is recorded instantly — the extra seals are added later
Right away, when you stamp: your hash, its @beat and UTC time, and its position in the append-only hash-chain. That alone already proves the document existed at that moment.
After the week ends — once the current week closes (the following Monday, 00:00 UTC) its weekly Merkle root is frozen, and three independent layers are added on top:
- Ed25519 signature — added the moment the week is sealed.
- Bitcoin (OpenTimestamps) — submitted within the hour; confirmed in a Bitcoin block a few hours later.
- Bank anchoring — the root is recorded against an independent bank reference and published, usually within a few days.
So a fresh certificate that shows “pending — week still open” is completely normal. Come back after your week has ended and been sealed, then verify again or download the certificate once more (or scan its QR code) — the signature, Bitcoin attestation and bank anchor will then appear. The timestamp itself never changes.
Weekly Hash Anchoring
Each week's Merkle root is anchored against an independent bank reference — a separate, timestamped record that the week's log existed by that date.
How it works
1. Your browser computes the file's SHA-256 — the file stays on your device.
2. The hash is recorded in an append-only, hash-chained log with its @beat and UTC time.
3. Each week all hashes are combined into a Merkle root, signed with our Ed25519 key and anchored externally — against an independent bank reference and in Bitcoin via OpenTimestamps.
4. Anyone can later verify a file's hash, its timestamp, its inclusion proof up to the anchored root, the signature, and the Bitcoin attestation (downloadable .ots).
This attests existence at a point in time and integrity — not authorship or authenticity of the content.
Sharing a stamped photo through a messenger? Send it as a document/file — apps that recompress images change the bytes, and the hash of what arrives no longer matches the stamped original.
Want the exact algorithm — leaf and node hashing, the signed message, how to recompute an inclusion proof? Read the full proof specification.
Proof answers “this existed before then”. Its mirror image answers “this cannot be read until then”: a time-sealed envelope that opens only after a chosen @beat, and only when independent key holders come together — so nobody can open it early, ourselves included. Live and public today for developers; the one-click flow lands here next.
Weekly Merkle roots are signed with our Ed25519 key. Public key:
YNVYXDyg3hQGM3F+/ec+ZNmeN1JI/hZX+CxLqyJdyN0=