Open the seal file you saved when you sealed, then the original files. This page recomputes every fingerprint here in your browser and compares it with the seal and with Pith's public record. Nothing is sent unless you choose to reveal a file.
No seal file opened.
Files in this seal
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Reveal the selected files
Revealing publishes each selected file's fingerprint, salt and path on the seal's public receipt, so anyone holding the file can check it. It does not upload the file. Add where the work can be read, if it's public. Select every file to show that nothing in the seal stays hidden; the receipt then says so.