Multisig support

[jleni]

Multisig support

[kantai]

As part of multisig support, it would be very useful to allow the 5757' derivation path prefix in addition to the current 44'/5757' prefix. The 5757' prefix was used in multisig wallet setups in Stacks 1.0, where the derivation path was similar to the derivation path used for bitpay multisig and electrum multisig:

m/5757'/<account-index>'/<co-signer-index>/<change>/<address-index>

Where instead of the 45' purpose, 5757' is used.

e.g.,

m/5757'/0'/0/0/0
m/5757'/0'/0/0/1
...

[kyranjamie]

@kantai unless there's some issue where it rejects that path (I haven't checked), the client lib lets you to define the derivation path at runtime.

Such as:
https://github.com/Zondax/ledger-blockstack/blob/91a5a75181316182d4ba79fc7a2ad9dc410908d1/js/src/index.ts#L149

So no additional changes should be needed (other than #52)