Yeah, I'm using nicehash definition of PPS, but they are a hash rental company really, not a pool, so there might be a difference.
Yeah, if a pool pays you for your shares only after a block is found, then yes, that could be abused as you described. But from memory I think pools usually credit you for your shares immediately, so in theory you could get paid in PPS without the pool finding any block.
Yeah, that's it there - with nicehash you're selling your work to a buyer, who pays you per share. When you're on a pool directly, you need the blocks to come in
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