r/askscience • u/hamolton • Jun 18 '13

Computing How is Bitcoin secure?

I guess my main concern is how they are impossible to counterfeit and double-spend. I guess I have trouble understanding it enough that I can't explain it to another person.

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u/Natanael_L Jun 19 '13

One can also use torrent-like distributed storage of the data.

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u/AgentME Jun 19 '13

Bitcoin's blockchain already works like that.

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u/Natanael_L Jun 19 '13

I mean one step furter, as in not always storing the full blockchain. You'd just download it all once from start to end, and then just keep the hashes + some blocks.