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As I know bitcoin has about 10K full nodes. And the question is in my mind is that: This number is not huge! If someone has 6K servers, Can control the bitcoin via 51% attack?
I was thinking if bitcoin had millions of nodes everything was ok but 10K is enough? What is the magic here that people trust bitcoin with 10K nodes?
1Note that it's not about the number of full nodes but the computing power that can influence such an attack – Cedric Martens – 2019-04-13T12:54:39.960
I know, But that full nodes are not special powerful computers. I know it costs too much but I'm thinking if someone want to destroy bitcoin, It seems it's possible. Just need a few thousands PC's with good GPU. I mean "someone" like Russia, China or... they have that money and power – Fcoder – 2019-04-13T13:48:56.957
2@Fcoder you are confusing 'network full nodes' with 'miners'. Running 10k full nodes has nothing to do with a 51% attack. GPUs are useless when mining bitcoin, specialized ASIC hardware is required. – chytrik – 2019-04-13T16:03:13.160
2A few thousand PCs with GPUs will not even make a dent in the total hashrate. 10000 GPUs, assuming the best available hardware, can hash at around 10 Thash/s. The global hashrate is approximately a million times more than that. – Pieter Wuille – 2019-04-13T18:46:27.860