doc-hex

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I have code for this now (BIP38) and it also handles a bunch of other simpler private key formats with auto-detect. Any interest, @richardkiss? It's one file.

Yes, pure python, but requires "scrypt" module. [scrypt==0.6.1](https://pypi.python.org/pypi/scrypt/0.6.1)

Never made a PR for this no, so I'm going to have another coder here look at doing this shortly.

When importing xpub, Bluewallet should verify the "child depth" value contained in the xpub. If it's zero, then the user has provided a root xpub (`m`) and not the derived...

Please let's keep NDEF records as binary. Space is tight on NFC tags and it's important not to bloat with base64 or hex encodings. In a few days I will...

> Any changes you deem necessary for successful transaction building through nfc? Bluewallet will just need to treat the Coldcard Mk4 as a tag, and write the PSBT. But will...

I have used the above APK on a Pixel 4a to successfully transmit a PSBT to a prototype Coldcard Mk4! Challenges: - Coldcard will accept base64 or hex or (preferred)...

Production Mk4 still far from shipping, and no proto's to spare at this time, sorry!

- we just recently merged all the mk4 code onto master, maybe that's an issue?

It is useful. We were planning to do something similar, except with just XOR of 1.. so you might call it "ephemeral seeds"