1) Not really - That is a hack, not a solution. It doesn't solve the underlying issue, just provides a bit of relief.

2) I believe they will participate. What I am hinting at is a strongarmed 51% attack on miners. I don't think they would stop mining, I think they could be coerced to alter the rules.

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The theory that there will be two (or more) sorts of coins is quite old. It's also possible that the price for the different classes of coins will be different. Anyway, I take it as chance to actually build a parallel structures with it's own money.

I don't believe that 51% attack is feasible for anyone. Just look at the hash reate right now. How many cards you need to buy (and/or manufacture)!. Not to mention that you need a place/cooling/power. That's (hundreds of) $ billons. You can't hide such as operation. Someone will notice that. And in that case all others have to do is to add let's say another 5% to stop them.

Also, who is them? Do you think that let's say China will cooperate with US gov. on this plan?

Multiple classes of coins is in my view definitely scary. I'd love to be as optimistic, but I cannot in good conscience. If a government can devalue your coins and/or make them less useable by their decrees, you are at their mercy. That is exactly what btc is supposed to prevent.

That's the problem of creeping centralization. Right now, we can see giant server farms and data stores. There is a definite, relatively small number of them, that can be coerced if needed. I expect something similar to happen to miners too. I don't think any government would purchase their own hw and secretly do a 51% attack. The vector of attack here is regulation of already operating miners.