here is code to keep track of two sets of addresses -- the
regular ones and the witness ones. But maybe those should be
merged becuase it's easy for other wallets to switch between them
and send to the same 20 byte pubkey hash but wintessified.
So maybe I'll change this stuff...
It doesn't work; can ingest out of order within a block,
so if a block has gain then loss, you might read it as loss
then gains, missing the loss.
Also, tryna implement p2wpkh
move methods to new files to keep things a bit organized.
add rebroadcast of unconfirmed txs after sync
mutex on OKtxid map
deal with doublespends next
when we get inv messages, txs are easy but blocks are a little tricky
block heigh synchronization is done via os' file system
signing is a bit inelegant (searches through inputs for pkscript matches)
but fast enough in practice
