She also sends her instruction out to the network. You might say "I want to send five coins to Bob." So you send that instruction to everyone else, but the coins aren't sent to Bob immediately.Ĭarol might decide at the same time to send Alice five coins. Suppose that you and your friends Alice, Bob, Carol, and Dan are running the software. That's what the software we mentioned earlier does. It's that everyone can download blocks from other people on the network to build identical copies of the blockchain on their computers. The innovation here isn't some cumbersome alternative to Google Sheets. You can't alter any information without everyone noticing.
You end up with a domino effect where any change becomes evident. And since that fingerprint is included in the next block, the next block is changed too. A blockchain is immutable: if you change a block, it changes the fingerprint.
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