BitProof

Verifiable timestamping for files, photos, and web pages.

Timestamp files and archive public pages.

Archive public pages or timestamp phone files. BitProof anchors a cryptographic hash to Bitcoin, proving exact content existed by that time and exposing later edits.

Archive a social post →
Why this matters →
Install Firefox add-on →
FILE
Drop your file here
or click to select
File stays on your device. Only the hash is sent.

On iPhone: use "Use Camera / Photo" for quick screenshot timestamping.

What this proves: this exact file existed by the anchored time and has not changed since. Metadata comparison →

Hashing your file…

✓

Proof Created

Keep your .bitproof bundle along with the original file. The timestamp confirms on Bitcoin in ~1-2 hours. Verify anytime →

Web archive evidence pack

Each archive bundle includes screenshot, HTML source, PDF rendering, and proof.

Anchored to Bitcoin

Proofs are timestamped through OpenTimestamps and anchored to Bitcoin blocks.

Private file hashing

For files, hashing happens in your browser so raw file content is not uploaded.