Support Cobo Vault import xpub with microSD

[ben-kaufman]

Seems like the format Cobo uses isn't compatible with what we currently support.

Here are example files from Cobo to test with: Cobo export xpub.zip

[ChristopherA]

I encourage you to discuss interoperability standard issues in the Airgap Wallet Community so we can all benefit.

[ben-kaufman]

@ChristopherA Is there an active discussion there already on the file export formats or should I open one?

[ChristopherA]

@ChristopherA Is there an active discussion there already on the file export formats or should I open one?

@wolfmcnally just completed first alpha implementation of the UR crypto-hdkey export, but it needs more testing.

it looks something like:

which renders to

ur:crypto-hdkey/onaxhdclaxylahbdjshedknlckwzbblfjprtghwddegefersesioeetdtsasuejeiylerfeewzaahdcxuedtbwdkmtkkkiatktsrmnoysfwsmednfsvtjspkmncycwuedsdlqdptlacsknadahtaadehoyaoadamtaaddyotadlocsdyykadykaeykaoykaocymhaycmmtaxaxaycywkoelkseceroglvl

and is equivalent to:

[90081696/48h/1h/0h/2h] tpubD6NzVbkrYhZ4YYucCR8FWtDFKF3nPv2pcvKvgBJsQDWtEGuwsH8eXTqshGM1fGPrg1UyvpRZ9NiRAeSUUksGKyp8xZ3ZdegJ6EU9hC7gBJk

you might ask “why not just share in the the partial descriptor / base64 form?”

Four reasons:

• though it may look larger in text, in a QR it is more compact to take advantage of QR compression.
• the UR form is completely self describing, so you can append meta data (such as label, key birthdate, holder of key information, etc.)
• This UR can embedded inside other URs, such as a much larger descriptor. Currently rendering large multisig descriptors (what we call Account Maps) can exceed QR size limits. URs natively support animation when they get too large.
• everything is composable, and you can have metadata at multiple levels. Any level can be encrypted or secret shared, allowing for say an xprv to be socially recoverable.

I hope that we’ll be posting live demos, reference code, and some UX discussion for how to use in multisig scenarios next week.