Nobody should have to read call data to stay safe. We read it for you, in plain words, before you sign.

Presign started in Lisbon in 2025, after two of us lost a wallet to an approval we did not understand. The signature took a second. Reading it would have taken an hour.

So we built the hour into the second. Today Presign reads requests for people, wallets and exchanges, and every rule it uses is public.