Public verification

Every BuiltSign certificate is publicly verifiable

No account needed. Enter a certificate ID and see a summary of the signing: the signers, the hashes and the timestamp.

Tamper-evident document

A cryptographic hash of the signed document is stored with the certificate. Any change to the file after signing is immediately detectable.

Complete audit trail

Every action is recorded: who was invited, when they opened the link, from which IP address, and exactly when the signature was placed.

Independent timestamp

For every signed document BuiltSign requests an RFC 3161 timestamp from an independent time authority. Once issued, it records that the document existed in this form at that moment.

Verify a signed document

Drop your signed PDF here, or tap to chooseWe instantly check whether this is exactly the document signed via BuiltSign. No certificate ID needed.

or enter the certificate ID

You can find the certificate ID on the certificate page of the signed PDF.