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Oct 20, 2017 at 0:15 comment added David Schwartz @fresheneesz It is done by every client. But that doesn't help when there are two transaction that try to send the same funds to two different places. We need to somehow agree on only one of those and persist that agreement for all time. Mining is how bitcoin does that.
Feb 24, 2014 at 9:04 comment added fresheneesz No, that's not right. I'm not suggesting the blockchain be taken as truth from a single individual. I'm suggesting that the act of verifying transactions could be done by every client - not just mining clients.
Feb 24, 2014 at 6:30 history answered user13413 CC BY-SA 3.0