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For that you need to have more than half of the hash power of the blockchain, which means, for bitcoin at least, billions of hardware investment. A hacker can't

For that you need to have more than half of the hash power of the blockchain, which means, for bitcoin at least, billions of hardware investment. A hacker can't have such power.

notahacker 9y ago
On the other hand someone with significant influence over a small group of Chinese people still can, and not every blockchain is going to be anywhere near as distributed as BTC
neonnoodle 9y ago
No, but a state actor might...
rotten 9y ago
Many blockchain applications I've seen aren't distributed over millions of computer systems. Thousands, maybe. Hundreds for some.