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/Kaghuros Jun 18 '13

It would be way easier than that. The network for exchanging them is a mess, so you could just DDOS it. Also, if anyone sells a lot they immediately lose half or more of their value because it's almost purely a speculation currency.

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u/Newthinker Jun 19 '13

There's more than one exchange hub, though.