For anything worth proving
A tamper-evident, timestamped proof that these exact bytes existed at this moment, checkable by anyone, offline, independently. Only a hash of your work leaves your device, never the work.
1 · The work to seal
or paste text
It is a signed, timestamped record bound to a one-way hash of your exact bytes. Keep the seal with the work, and the pair can be checked. Verify one yourself, then change a byte and see verification fail.
The work itself is never sent or stored; the seal holds only its hash.
The Sealer also runs entirely on your own computer, no internet needed, no account, nothing to sign up for. Download it, double-click, seal files on your desk. Your seals can be checked here, free.
Existence, integrity, time. Sealed.
