OC Stamp

Verify a stamp

Paste a .stamp envelope or its share link, or drop the file. Your browser checks who signed it and which Bitcoin block it existed by.

Step 1: The stamp

A .stamp file, its JSON, or a share link.

Envelope or share link

Optional. Your browser hashes it and compares it with the stamp; the file never leaves this tab, and any size works.

Drop a file here, or choose one

It stays in your browser. Only its hash is compared.