An identity card that lives on your phone. Sign any message with it, and anyone holding your public card can check the signature is really yours — no account, no server, nothing phones home.
⚠️ Your private key lives ONLY in this phone's browser storage. It never leaves your phone — and if you clear your browser data, it's gone for good. Export the ID file somewhere safe if this identity matters to you.
What a check proves: the message was signed by whoever holds the private key behind that public card, and not a word was changed since. What it does not prove: who that person is in real life — a card is only as trustworthy as how you got it. Compare the fingerprint through a second channel (read it out loud, send it separately) before you trust a card with anything real.