What am I signing? — decode any transaction before you approve it

what am I signing?

Paste a transaction. Find out what it actually does.

Transaction data, or the signature request your wallet is showing you

What this does with your data

Nothing leaves your browser. The decoding is arithmetic on a hex string, and it happens on your device.
No wallet connection. There is nothing here to approve, so there is nothing here to steal.
No account, no tracking, no logging of what you paste.
It will tell you when it doesn't know. An unrecognised function is reported as unknown, never guessed at.

This tool explains what a payload does. It cannot tell you whether the people behind it are honest. A perfectly ordinary transaction can still be sent to you by a thief.

Function selector reference — what every selector means, and the patterns worth recognising on sight.

Free, and staying free. Built because people lose money reading hex.