Blockchain originated from Bitcoin. On November 1, 2008, a self proclaimed Satoshi Nakamoto published an article titled "Bitcoin: A peer-to-peer electronic cash system", which elaborated on the architecture concept of electronic cash systems based on P2P network technology, encryption technology, timestamp technology, blockchain technology, etc., marking the birth of Bitcoin. Two months later, theory entered practice, and on January 3, 2009, the first Genesis block with a serial number of 0 was born. A few days later, on January 9, 2009, a block with sequence number 1 appeared and connected to the Genesis block with sequence number 0 to form a chain, marking the birth of blockchain.
Blockchain is a chain composed of blocks one after another. Each block stores a certain amount of information, which is connected into a chain in the chronological order of their respective generation. This chain is stored in all servers, and as long as one server in the entire system is operational, the entire blockchain is secure. These servers are referred to as nodes in the blockchain system, providing storage space and computing power support for the entire blockchain system. If you want to modify information in the blockchain, you must obtain the consent of more than half of the nodes and modify the information in all nodes, which are usually in the hands of different entities. Therefore, tampering with information in the blockchain is extremely difficult.
Compared to traditional networks, blockchain has two core characteristics: first, data is difficult to tamper with, and second, decentralization. Based on these two characteristics, the information recorded by blockchain is more authentic and reliable, which can help solve the problem of people's mutual distrust.