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this post was submitted on 09 Feb 2024
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Yes there is, massive power use is the entire point of proof-of-work. If Bitcoin blocks could be produced without massive power use then the blockchain's system of validation would fail and 51% attacks would be trivial.
the hash rate for the first blocks was achievable with a pentium 3. the protocol functioned then. there is nothing inherent to the protocol that dictates more hashpower is used. a 51% attack is the protocol functioning properly.
That's because there were just a handful of people mining the first blocks and there was no demand, so the price was basically zero.
The protocol is meant to promote decentralization, so I have no idea how a 51% attack would be an example of the protocol functioning properly. A 51% attack is a demonstration that the protocol is controlled by a single entity.
a 51% attack means that 51% of the hashpower has agreed on a certain chain. this happens every 10 minutes.
That's not an "attack."
no, it's the protocol functioning properly.
Right. Which is not what I was talking about. This was about how a PoW chain would become useless if there was no cost involved in making blocks, ie, if the "W" part was missing. It would allow anyone to add blocks. There'd be no way to distinguish forks from each other and decide on a canonical one. Being able to agree on a particular fork as being the "valid" one in a decentralized manner is the fundamental secret sauce of what makes cryptocurrency work. All the various protocols boil down to ways of solving that one particular problem.
even a 51% attack is just the protocol following its prescribed mechanisms.
Yes. But failing at the intent of the protocol in the process. When a hacker exploits a buffer overrun to take control of a remote computer, the computer is following its prescribed mechanisms to the letter. But that's certainly not what the computer's owner wants it to be doing.
If adding blocks to a PoW chain had no cost then the chain wouldn't be functioning as its users desire - there'd be no canonical fork any more. It would fail to solve the Byzantine generals problem, which is fundamentally the purpose of cryptocurrency.