Check a document

Anyone holding a file that came out of ShareSign can see here whether it is exactly what was sealed, and what the seal says. No account, and the file never leaves your device.

How it works: your browser works out the file’s SHA-256, a 64-character fingerprint that any change to the file would change, and sends only that. We answer with what the file’s own certificate already says, or that we have no record of it. More on what a check shows. Each night’s seals are timestamped by two independent authorities, and the list of them is public.