I am learning about Bitcoin mining and how it secures the network through Proof of Work.
I understand that miners compete to find a valid hash and that the network adjusts difficulty over time, but I’m struggling to understand how these mechanisms interact in practice.
Specifically:
How does the Bitcoin difficulty adjustment respond to changes in total network hash rate?
How do hardware efficiency and electricity costs affect whether mining remains viable?
How does Proof of Work prevent manipulation of transaction history at scale?
I am looking for a technical explanation of these processes rather than investment or profitability advice.
