TAPSIGNER

What is TAPSIGNER™?

A simple Bitcoin wallet in your pocket. Think of it as a Bitcoin private key on a card! You can sign mobile wallet transactions by tapping the card on your phone. Your mobile wallet provides most of the wallet logic and TAPSIGNER holds the secrets. It's essentially a hardware wallet you can slip inside your regular wallet.

What's the motivation for TAPSIGNER? You already make COLDCARD®.

• TAPSIGNER's lower cost makes hardware wallet features and security available to a wider market around the world.
• An NFC card provides fast and easy user experiences.
• TAPSIGNER is a great way to keep your keys separate from your wallet(s).
• Card form factor makes it easy to carry and easy to conceal.

What are some possible uses for TAPSIGNER?

• Phone wallet cosigning
• Opening and closing Lightning Network channels
• Using an NFC module with a Lightning Network node
• Message signing
• Collaborative multisig service applications
• Raw transactions
• Partially signed Bitcoin transactions (PSBTs) via HWI
• App Authentication