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but i think not always has task,when no task,miners have no income,they do what? may be thay will turn off mining machine!
may be some times,have huge task,have not enough miners,what will happen?
If it happens, we have our own computing power. In addition we can delay some orders. It means, miner and user have a contract but order is executed after. Some users don't want to pay more, so they will wait.