Download and run Bitcoin-core to run full Bitcoin node Listen for a new transaction, assemble a pre-block Solve the puzzle (~270 attempts) Broadcast the block Profit CPU mining - 220 - 224 hash/sec => 246 seconds (4 million years) to mine a block GPU mining(2010-2011) - 227 hash/sec with a single card FPGA mining(2011-2012) - 230 hash/sec. Even with ASIC miner like Ant miner S9 which has 12 TH/sec (243 hash/sec), one has 66% chance of 0 blocks, 27% chance of 1 block, and 7% chance of 2 blocks in a year.