Verify a file or proof bundle

Drop a file to check whether it's on record with BoC, or a BoC proof bundle (.json) to re-check its signatures, custody trail, and anchors — everything runs in your browser. No account needed.

Drag & drop a file — or a BoC proof bundle (.json) A file → we look up whether it's notarized (only its 64-char fingerprint is sent). A proof bundle → re-checked entirely in your browser; nothing is uploaded.

In-browser verification needs JavaScript. To verify offline, download verify-bundle.mjs below and run it with Node — or paste a fingerprint once scripting is enabled.

Offline verifier (download)

For a full, independent check of an exported proof bundle — custody chain, notary signatures (incl. key-rotation endorsement chain), Merkle anchors, checkpoint, and public-log inclusion — download BoC's standalone, zero-dependency verifier and run it yourself, with no account and no install beyond Node:

Download verify-bundle.mjs

node verify-bundle.mjs your-bundle.json [original-file]

It only uses Node's built-in crypto, so you can read every line before trusting it. This is the same program BoC's own test suite exercises.