Yes, if you imagine that the number of "votes" that each computer gets is proportional to its computational power ("hashing power" or hashpower). (if instead, e

Yes, if you imagine that the number of "votes" that each computer gets is proportional to its computational power ("hashing power" or hashpower). (if instead, each node got one vote, then it would be too easy for someone to create a million fake nodes to game the vote) Also as Taek points out, the protocol also contains some rules that constrain the content of the chain. No honest node will accept a chain violating these rules even if a majority of the hashpower supports such a chain. Note that this describes a "proof-of-work" chain. There are other forms of blockchains, such as "proof-of-stake", in which the number of "votes" is proportional to something other than computational power.