The underlying logic of the blockchain is to build a trustless, transparent, non-tamperable and secure distributed ledger system through a series of key technologies, such as decentralization, consensus mechanism, encryption algorithm, smart contract, etc. It solves issues such as trust, transparency, and data security through technical means, allowing participants to conduct trusted transactions without intermediaries. These features are not only applicable to the cryptocurrency field, but can also be widely used in many industries such as supply chain management, finance, and voting systems.