Independent Verifier
Confirm a receipt without trusting this office.
The instrument below verifies the binding between a file and an Orphograph receipt entirely within the reader's browser. No data is transmitted; the page itself may be saved to disk and used when this office is unreachable.
Step one — the file
Drop the file here, or click to select.
The file is read locally; nothing is uploaded.
Step two — the receipt
Drop the receipt JSON here, or click to select.
A JSON receipt as issued by Orphograph, or paste its text below.
Awaiting a file and a receipt.
Once both are present, the verifier will compute SHA-256 locally and compare it to the fingerprint recorded in the receipt. If the receipt also carries SHA-512, the sibling check is performed as well.
What this page does not do
The page verifies the file→receipt binding. It does not verify the Bitcoin-chain attestation that the receipt carries. For end-to-end verification against the chain, the receipt's .ots files are checked by the standalone verifier published at github.com/Orphograph/Orphograph, or by the OpenTimestamps command-line client. The two checks together constitute full independent verification.
This page is intentionally self-contained: a single HTML document, no external scripts, no build step. Once saved to disk, it remains a working verifier even if this office is offline or no longer reachable.