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What Is a Blockchain? It Is a Chain of Hashes, Not a Chain of Blocks.
A blockchain is an append-only log in which each block records the hash of the block before it. That single link is what makes an edit detectable and expensive, and it settles nothing on its own: who may append the next block is decided by consensus rules, not by the chain of hashes. -
How Bitcoin Mining Works: a Target, a Nonce, and a Difficulty That Catches Up
Bitcoin mining is not puzzle solving. A miner hashes an 80-byte block header, changes the only free number in it, hashes again, and repeats until the result falls below a target that the network re-tunes every 2,016 blocks. The economics come from the block subsidy plus fees, and the subsidy halves every 210,000 blocks.- 6
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Bitcoin Is Four Things: What the Word Means, and How a Coin Gets Made
Satoshi’s own 2008 email said new coins are made from Hashcash style proof-of-work. The 21 million and the ten minutes both follow from that one sentence. Here is the whole machine, with numbers you can check yourself.- 16
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