Private tx broadcast

Date: April 8, 2024

Updates:

TX is validated before broadcast (using mempool test).
The sender ignores incoming messages from the receiver (except the handshake and PONG), so the sender cannot send back the tx before disconnection.
When it receives the tx back, it becomes “just a tx in mempool”.

TODO/NICE TO HAVE

Check if the wallet is going to rebroadcast a tx it has created but has been broadcast via private broadcast and if yes, prevent that.
Consider disabling walletbroadcast=1 if privatebroadcast=1, or in other words - enforce walletbroadcast=0.
RPC to check the stats.