Does nfc work well for psbt? And does it have coin control?
Discussion
Yes it has coin control. I do not know about nfc I just use QR codes with a Coldcard Q and a passport
It has native NFC support for the Coldcard Mk4 and the Q, as well as Portal.
I take that back I’ve used it with a tapsigner before using nfc but I’ve never used nfc for psbt
Yes to both questions.
* Except for very large transactions where you might hit a NFC bandwidth limit, but extremely rare.
Would you run into a limit with a Tapsigner? It’s just like a blind signer, right?
Yeah, it's a blind hardware signer. With Nunchuk, it basically uses the Tapsigner as a key so that the Tapsigner is called whenever you tap the button to sign your transaction. And Nunchuk manages backup creation as well, so that if you lose or destroy your Tapsigner, you'll be able to restore the backup to a software key so you can access your funds. I don't believe there's any fund limit imposed by Tapsigner. It should be able to sign transactions regardless of the size. Personally, I love it and it's been a great experience when paired with Nunchuk.