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I believe everyone must have heard of the virtual economy, and now many people are playing with virtual currency. Virtual currency is also known as digital currency. The most famous one is Bitcoin. Many people know that mining virtual currencies such as Bitcoin requires specific mining machines. Now there are many mining machines on the market. One of the mining methods is called CPU mining. So what is CPU mining? What is the principle of CPU mining? Let’s join the editor today to explore CPU mining.

CPU mining uses the RPC interface setgenerate to control mining. Console input setgenerate true
2. Start mining. The number behind indicates the number of mining threads. Of course, the data must be synchronized first.

Since the computing power of SHA256D on a single CPU is about 2 MH/S, the 4-byte search space provided by nNonce is completely sufficient, that is, it supports 4G values.

The computing power of GPU SHA256D is about 200M-1G. nNonce provides 4G search space. If you only adjust the nNonce value, it can support about 4 seconds. Therefore, nTime can be adjusted. Each time nTime is adjusted, mining can continue for 4 seconds.

GPU mining uses the GETWORK protocol, which means the mining program and the node are separated, that is, the mining components are separated from the blockchain data. In the era of GPU mining, the GETWORK protocol is used to allow the mining program to interact with nodes. The core idea is: the node constructs a block, hands the block header data to the mining program, and the mining program traverses nNonce for mining. After verification, the block is delivered to the node, and the node extracts nNonce and nTime verification blocks. If it meets the requirements, it will be broadcast to the entire network. At the end of the traversal, GETWORK will be called, the node will construct a new block, and then repeat the above process.

The classic GPU mining driver is cgminer, and the source code is 

GPU mining defect: The search space provided by the GETWORK protocol to the mining program is 4G, and the GETWORK RPC interface needs to be called again after completion. After the emergence of mining machines, the computing power of mining machines has reached 10
TH/S, continuing to use the GETWORK protocol will frequently call the RPC interface, which is obviously not appropriate. Therefore, it is necessary to switch to the more efficient getblocktemplate protocol.

The above is a detailed introduction to what is CPU mining? What is the principle of CPU mining? I believe everyone has an understanding of the CPU principle. However, the era of CPU mining has long passed, and now Bitcoin mining is the era of ASIC mining and large-scale cluster mining.