pythcoiner

utACK [cf378ba](https://github.com/stm32-rs/stm32f3xx-hal/pull/327/commits/cf378ba703fce3a88572d23089c23aec1baf2ffa)

Hi Salvatore, I successfully used this PR with simples scripts from Liana, but getting some issue with some more complex one: ```shell $ python3 -m hwi --debug --device-type ledger registerpolicy...

> @pythcoiner: most likely the reason is that `zpubs` are not standard and unsupported; they need to be `xpub` on mainnet, or `tpub` on any testnet/regtest/signet. i just checked the...

> 1. Not sure if the checksum `#lnc99art` is handled, my examples above are without > 2. There's a `pkh(@1/*)` that should be `pkh(@1//*)` > 3. The policy is too...