What does the checker send?

The Bitcoin address you paste, to blockstream.info, to read public spend history.

Do you want my seed phrase?

Never. If a page asked for one, it would be a bug or an impostor.

Do you use tracking cookies?

No advertising cookies. We may use aggregate visit counts that do not build a profile.

Privacy

A Bitcoin address card clipped to a copper cable, a physical bitcoin on a sealed box, and a seed card left face-down. — One tool makes a network request. The rest of the site does not need to.

The checker sends the address you enter to blockstream.info to read public transaction history. Bitcoin addresses are public by design. Still: that request is real, and it is the only one this site asks a browser to make for a tool.

What we do not want

Never paste a seed phrase or a private key anywhere on this site. The checker only classifies addresses.

Analytics

We may use privacy-respecting, aggregate visit counting that does not set advertising cookies or build an individual profile.

Contact

hello@catbitcoin.com

Quick answers

What does the checker send?: The Bitcoin address you paste, to blockstream.info, to read public spend history.
Do you want my seed phrase?: Never. If a page asked for one, it would be a bug or an impostor.
Do you use tracking cookies?: No advertising cookies. We may use aggregate visit counts that do not build a profile.