Nobody has been able to come up with an equivalent alternative. The closest seems to be proof-of-stake instead of bitcoin's proof-of-work, but the security beco

Nobody has been able to come up with an equivalent alternative. The closest seems to be proof-of-stake instead of bitcoin's proof-of-work, but the security becomes weaker (which is basically the whole purpose of bitcoin), see https://bitcoin.stackexchange.com/questions/70807/how-does-proof-of-stake-prevents-dishonest-behaviour-compared-to-pow https://bitcoin.stackexchange.com/questions/70807/how-does-p... Is PoS strong enough to still be 99% as useful?, I don't know, these are all experiments