How Bitcoin works: the blockchain explained
Bitcoin mining: what miners really do, and why it takes so many guesses
Somebody must write each new page of Bitcoin's ledger, and a cheater would love that job. So Bitcoin makes the job very hard, on purpose. What are all those mining machines really doing?
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1
Any node could pack waiting payments into a block. If any node could add its block at once, a cheater could add blocks all day. So Bitcoin makes adding a block hard.
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To add a block, a computer must find one number to write in it. The right number gives the block a hash that starts with a long row of zeros.
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