That's how pooled mining works, but I think you have to trust the pool operator to do the % accounting. The % split is not recorded in the blockchain. The bloc

That's how pooled mining works, but I think you have to trust the pool operator to do the % accounting. The % split is not recorded in the blockchain. The block reward payout destination address is part of the coinbase that everyone is trying to mine. You can't have the actual block contain a list of all active miners; as the list of miners changes, the target coinbase hash changes too. There wouldn't be any incentive for anyone to try to mine a coinbase containing rewards towards other miners. That would just be giving away your block reward to others for free: If you are actually able to find a block before anyone else, you should have tried to find a block that maximizes payout to yourself.