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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?

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    Note that it's not about the number of full nodes but the computing power that can influence such an attack – Cedric Martens Apr 13 at 12:54
  • 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 Apr 13 at 13:48
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    @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 Apr 13 at 16:03
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    A 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 Apr 13 at 18:46

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