The final app should be an Express.js app that can be packaged into an Umbrel app that queries your own full node.
- Add support for legacy, segwit and native segwit addresses
- Legacy xpub ==> P2PKH
- SegWit ypub ==> P2WPKH-P2SH
- Bech32 (Native SegWit) zpub ==> P2WPKH
- Singlesig vs multisig?
- Validation of addresses