TAPSIGNER

A simple #Bitcoin wallet in your pocket. brought to you by the makers of @COLDCARDWallet & @SATSCARD

[TAPSIGNER @TAPSIGNER]

A simple #Bitcoin wallet in your pocket. brought to you by @Coinkite the makers of @COLDCARDWallet & @SATSCARD

Learn more at https://t.co/bfKh2qkv5k

[TAPSIGNER @TAPSIGNER]

Honey Badger. Lady Bitcoin. Metro Card. Genesis block. Blank canvas.

Which TAPSIGNER are you carrying?

[TAPSIGNER @TAPSIGNER]

Want your logo on a Bitcoin signer?

We make custom TAPSIGNER runs for wallets, events and communities. [email protected]

[TAPSIGNER @TAPSIGNER]

Wallet developers: NFC Bitcoin signing without a private black box.

https://t.co/qNO7KDu14H

[TAPSIGNER @TAPSIGNER]

The protocol is open. Read it, build with it, break out the test vectors.

https://t.co/0LrxsXzEAI

[TAPSIGNER @TAPSIGNER]

Where does yours live: single-sig or multisig?

[TAPSIGNER @TAPSIGNER]

Keep TAPSIGNER. Tap it to sign.

Hand SATSCARD over when the bitcoin should travel with the card.

Two cards, two jobs.

[TAPSIGNER @TAPSIGNER]

That paper sleeve is not packaging. It blocks RF. Keep it.

[TAPSIGNER @TAPSIGNER]

Genuine card? A compatible wallet should check the Coinkite factory certificate during setup.

[TAPSIGNER @TAPSIGNER]

TAPSIGNER ships blank. Your wallet supplies a chain code; the card makes its own secret. The key is born during setup.

[TAPSIGNER @TAPSIGNER]

A logo on a wallet page is not enough. Make sure the app can set up, back up and recover your TAPSIGNER properly.

[TAPSIGNER @TAPSIGNER]

Yes, you can use TAPSIGNER on desktop. Sparrow + a compatible USB NFC reader.

[TAPSIGNER @TAPSIGNER]

What are you using yours with—Nunchuk, Cove, Bitcoin Keeper or Sparrow?

https://t.co/3AhxW2Nu3u

[TAPSIGNER @TAPSIGNER]

Need a small, independent multisig key? That's a very good job for TAPSIGNER.

[TAPSIGNER @TAPSIGNER]

Multisig people: back up the wallet descriptor too. A pile of keys is not a wallet policy.

[TAPSIGNER @TAPSIGNER]

A backup you've never tested is still a theory.

https://t.co/WRpARZbLya

[TAPSIGNER @TAPSIGNER]

Changed the factory PIN? Good.

Stored the new PIN with the card? Not so good.

[TAPSIGNER @TAPSIGNER]

Your PIN authorizes the card. The printed backup key handles recovery.

Two different secrets. Treat them that way.

[TAPSIGNER @TAPSIGNER]

No seed words here.

Recovery uses an encrypted backup file plus the separate key printed on the card. Keep them apart.

[COLDCARD @COLDCARDwallet]

COLDCARD offers two dice workflows. Standard Dice Rolls combines your rolls with device entropy. Dice Rolls Only derives the seed entirely from your rolls, with minimums of 50 rolls for 12 words or 99 for 24.

https://t.co/fiQ1HUWqpc

[TAPSIGNER @TAPSIGNER]

Back up your TAPSIGNER before you fund it. Future you will appreciate the two minutes.