Prove your document existed today, without showing it to anyone.
Drop any file or paste any text. It is hashed in your browser — the content never leaves your device. Only the 64-character SHA-256 fingerprint is anchored to a public registry with a timestamp. Anyone holding the same document can verify it forever; nobody can reconstruct it from the hash.
Fingerprint made on this deviceSHA-256 · Web Crypto
Drop a file here or click to choose Read locally · never uploaded · any size, any type
Keep the original document safe — the anchor proves a document with this exact fingerprint existed now; only the original file can reproduce the fingerprint. Change one character and the hash breaks.
Latest public anchors
Reviewed anchors whose owners chose a public label. Unlabeled anchors exist too — they simply stay private. Click any to verify.
What this is — and is not. Anchoring proves a document existed, unchanged, at a point in time. It is not a clinical signature, not a copyright registration, and not legal advice. Daily, the whole registry’s root is countersigned into Bitcoin via OpenTimestamps — your proof survives even if hashcare disappears — here is how to check that yourself. Physician-signed clinical attestation is a separate rail — see verify and the review network.