* Create redeem script for SONs primary wallet
* Add importaddress call
Allows to watch for related transactions without private keys import
* Get UTXO set for watched addresses
* createrawtransaction call
* signing PW spending transaction
* unit test for btc tx serialization
* sending PW transfer in test
* BIP143 tx signing
* use bech32 address format
* use single sha256 for lock script
* Digest fix
* working signing
* separate signing
* test partially signed PW transfer
