Add BBQr

[nvk]

Add BBQr (Better Bitcoin QR) support

This is a new Bitcoin QR spec for PSBTs and other Bitcoin related data types. It adds very good compression for PSBTs (30%), its very simple to implement and supports animated/paged QRs. It does also fall back to standard when low data needed.

It's currently implemented on COLDCARD Q, Sparrow, BTCPay server (merged), Nunchuk (wip) and a few others WIP.

• https://github.com/coinkite/BBQr
• example js https://bbqr.org/js-demo.html
• example python https://github.com/coinkite/BBQr/blob/master/python/bbqr/cli.py

COLDCARD has alot of Bluewallet users, so would be a nice addition.

[Overtorment]

I assume js implementation can be found here? https://github.com/coinkite/BBQr

Whats the workflow is like, give that theres also BC-UR? Say, user creates a tx on BW, and BW shouldbe aware what kind of device it is paired with, so if its COLDCARD Q it renders BBQR, and if not - BC-UR ?

[doc-hex]

• Yes the JS/Typescript code is BBQr/js
• Very easy to detect BBQr, as the first two characters are always B$ .. so on receive not a problem.
• For sending the PSBT, you'd need to know that it was a COLDCARD and so do BBQr rather than something else.

[scgbckbone]

hey guys, do you plan to implement this? any ETA? let me know if you need any help from CC side

[Overtorment]

i plan to work on this, just dont know when yet