Mining reward

Mining rewards. In order to encourage miners (if there are no miners, transactions cannot be confirmed), Bitcoin developers stipulate that the generation of new blocks will reward miners with a certain amount of Bitcoin. At the beginning of 2008, it was 50 bitcoins, which were halved every four years, and now it is 12.5 bitcoins in 2018. By this calculation, by 2140, the global bitcoin will stop growing. There will be more than two million bitcoins in the world at most. Currently 20% of Bitcoin has been mined. By 2140, new blocks will still be generated, but the newly generated blocks will not reward miners with new bitcoins. Is there any way for miners to make profits? Have! Miners can charge fees. Because each transaction will not be officially confirmed until the miner writes the transaction into its own block, if you give the miner less the handling fee, then it is possible that the miner will not write your transaction in, so Your transaction is confirmed to have to wait a long time until a miner writes your transaction in.