Awesome project PawGo, thanks for share it with the community 
For my projects i used the 'blocknotify' command to look for new transactions in my core, but i really love the way how you take the transactions direct from the mempool, that's much faster and this way we spend the coins before they confirm, so +1 for that.
And now i have a technical question... What would happen if you and other user are running the program at the same time with the same private keys but sending to different address? My prediction is a double spend...
For my projects i used the 'blocknotify' command to look for new transactions in my core, but i really love the way how you take the transactions direct from the mempool, that's much faster and this way we spend the coins before they confirm, so +1 for that.
And now i have a technical question... What would happen if you and other user are running the program at the same time with the same private keys but sending to different address? My prediction is a double spend...