The confirmation of the transaction is inseparable from the miner. Why would anyone want to be a miner?
The Bitcoin protocol stipulates that miners who dig new blocks will be rewarded. At the beginning (2008), it was 50 bitcoins, and then halved every 4 years. Currently (2018) it is 12.5 bitcoins. This is also the mechanism of Bitcoin's supply increase, and the new Bitcoins in circulation are born in this way.
As you may see, the reward is halved every 4 years. Since Bitcoin can be divided to eight decimal places, then by 2140, miners will not receive any rewards, and the number of Bitcoins will stop increasing. At this time, the income of the miners depends entirely on transaction fees.
The so-called transaction fee means that miners can draw a deduction from each transaction, and the specific amount is voluntarily determined by the payer. You can pay nothing and don't give a cent to the miner, but in that case, no one will process your transaction, and you will not be able to write to the blockchain and get confirmation. Miners always prioritize transactions with the highest fees.
At present, due to the rapid increase in the number of transactions, the handling fee has risen, and the total handling fee for more than 2,000 transactions in a block can reach 3-10 bitcoins. If your handling fee is lower, it is likely that a week has passed and the transaction has not been confirmed.
The reward for a block is 12.5 bitcoins, plus the handling fee, the income is considerable. According to the current price, it can reach 1 million to 2 million yuan. Think about it, if you are lucky, you can dig a block in a few minutes and get such a large sum of money. No wonder people are eager to mine.
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