Bitcoin Mining & Proof of Work

What you’ll learn

• •Mining is the competitive process that verifies transactions, creates new blocks, and issues new BTC.
• •Proof of Work makes block creation computationally expensive on purpose — that cost is what secures the network.
• •Solving the mining puzzle is hard; verifying a solved block is nearly instant, which is what lets the network trust it without trusting the miner.
• •A 51% attack would require out-computing the entire honest network combined — the bigger the network, the safer it gets.
• •Difficulty adjusts automatically roughly every two weeks to keep block time near 10 minutes, with no central authority involved.
• •Modern mining runs on industrial-scale ASIC hardware, not home laptops, and electricity cost drives where it happens.