Maybe someone should attack these coins to drive value back to btc And eth.
Why not drop an anchor in eth btc and bch just to make it 3x harder to bust
Doesnt 50 pct of hash power just means you are likely to get two blocks in a row? In practice you need about 6 confirmations so thats only 3 pct of the time that would get six in a row.
This could be wrong i am legitimately asking.
I think it all just depends on the protocol of the given coin. I'm not confident of the technicalities either... but if you have 51% of the hash power I think you can deny someone else's claim to a valid block.
51% hash power allows you to author every block in a row with a certainty of 1. 40% hash power gives you 0.5 certainty of mining 6 blocks in a row. There is a calculator online somewhere, can't find it now. This is why mining pools are such a disaster for PoW security.