Verify a signature
Paste a signature block or a verify link anywhere on this page, or drop a file with its signature. The check runs here in your browser, with the card’s keys and the public log. Nothing you check is sent anywhere.
This link sent the message to the serverIt went there so a preview could show who signed it. That preview is the server’s word. The result below is this browser’s own check.
Result
Open in the logNo signature yet
Paste a block under “Check a signature” or open a verify link, and the result will appear here.
| File | SHA-256 | Size | Result |
|---|
Message
–
signed by a key
Entry
–
of the card
Inclusion
–
up to the root
Root
–
checkpoint size
Signature
–
operator
Cosignature
–
witnesses
Cosigned by
Nothing checked yet
What a signature block looks like
The message comes first. Under it, one line names the card and one carries the signature. Paste all of it, just as it was posted.
Then this browser checks
- which of the card’s keys made the signature, and since when that key could sign
- that the public log lists those keys on the card
- that independent witnesses cosigned that log