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Because the chain of transactions with the most accumulated waste is chosen as the "correct" chain. In order to double-spend, you have to cause a different chai
by DennisP 5y ago
Because the chain of transactions with the most accumulated waste is chosen as the "correct" chain. In order to double-spend, you have to cause a different chain to be the "correct" chain, so you'll have to waste even more energy than has been wasted by everybody else, over whatever span of time you're trying to roll back. Thus the more waste, the more secure the chain.
Proof of stake is a newer way of coming to consensus on one correct chain. It took people a while to figure out how to do it securely and efficiently.
- lottin 5y agoOkay, so the chain of transactions that is regarded as correct is the one that has been more expensive to create. Instead of wasting energy, the same result could be achieved by wasting other stuff, such as bitcoins themselves, for instance?
- DennisP 5y agoSure. In fact, that's almost how Ethereum's proof-of-stake works, except it has a protocol that comes to consensus without wasting anything as long as people follow the rules, and only destroys stake when someone provably breaks the rules.
- lottin 5y agoIf this is true, PoW is simply a stupid version of PoS and should be abandoned immediately.