Public proof of authenticity
File proof
A permanent record that this file is sealed and timestamped. Download the .sig and confirm it hasn't been altered by uploading the file.
Sealed & timestamped
On record as sealed by the issuer and anchored. Upload the file to confirm it hasn't been altered.
Shows the sealing certificate and that the file is byte-for-byte intact.
Independent proof it existed by a certain date, on the public ledger.
Download .ots proof89dff298373c627944b25515fdd3addf2614c7f54f4d8aefaafc3fc432a29c38Save it beside your file and verify anywhere, with no Let's Seal server: openssl cms -verify -inform DER -in file.sig -content file -binary -CAfile letsseal-root.crt
Verify it yourself. Download the .ots proof and run ots verify your-file.pdf to confirm the anchor against the blockchain. The proof stands on the public ledger. Let's Seal holds no cryptocurrency and you never touch a coin or a wallet — we use the public ledger the way a notary uses a public register, to stamp a record no one can alter.
Transparency log
Recorded as entry #322in Let's Seal's public, append-only log (of 399 total).
The log can only ever be appended to — never edited or deleted, and anyone can prove it. Fetch this entry's inclusion proof and check it against the signed tree head; the head's root is itself anchored to the blockchain.
Does this issuer look like it's impersonating someone? Report this issuer