Check a record yourself
Three tools, nothing to install. Pick the one that matches what you have in hand.
Stamp a file
Free, and nothing to install. Drop a file on the page, or choose one. Your browser computes the file's fingerprint and only the fingerprint is sent, so the file never leaves your machine. It records that a file existed in exactly that form by that time. It does not record who made it.
Stamp a fileVerify a receipt
Paste or drop a receipt JSON file, or a whole class of them. Everything runs in your browser: the digest is recomputed with SHA-256, and nothing is uploaded anywhere.
Verify a receiptReconcile two records
Paste or pick two tapes, the agent side's and the tool side's. The answer is one of MATCHED n of n, MISSING at k, ALTERED at k, or COULD NOT LOOK. The tapes are sent to the witness service for that one comparison and are not kept.
MATCHED between two tapes one party wrote is consistency, not independence.
Reconcile two recordsWant it inside your AI instead?
The same checks run on your own machine after one install.
Get it for your AI