[eru]

> half agree with that. PoW is the most efficient method of converting raw energy into a digitally secure token. It would be much better if the work done was actually useful beyond that.

I'd say PoW is not the most efficient method. It's a terrible waste by design.

The kind of 'work' that works in PoW has some rather strict requirements, that's why it's almost impossible to shoehorn useful work into a PoW scheme.

Wikipedia tells me that eg GridCoin uses proof-of-stake to prevent double-spending attacks; its rewarding people for BOINC work is a totally separate gimmick.