Bitcoin blocks have changed a lot since 2009. They contain thousands of transactions, instead of one. They take 10 minutes to mine. Miners are rewarded with 6.25 BTC, after three “halvings” of the reward, which occur roughly every four years on a predetermined schedule. As of December 2022, there were more than 750,000 blocks in the Bitcoin blockchain. They form an unbroken sequence, each specifically referencing the previous one, stretching all the way back to the Genesis Block.