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.
Want the exact algorithm — leaf and node hashing, the signed message, how to recompute an inclusion proof? Read the full proof specification.
Weekly Merkle roots are signed with our Ed25519 key. Public key:
YNVYXDyg3hQGM3F+/ec+ZNmeN1JI/hZX+CxLqyJdyN0=