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Blockchain (English name: blockchain or block chain is a decentralized distributed ledger with block chain storage, non-tamperable, safe and trustworthy, which combines distributed storage, point-to-point transmission, consensus mechanism, cryptography and other technologies , recording transactions and information through the growing data block chain (Blocks) to ensure data security and transparency.

Blockchain originated from Bitcoin and was first proposed by Satoshi Nakamoto in 2008 as the underlying technology of Bitcoin. Starting from the Bitcoin network in its early days, blockchain has gradually evolved into a global technology, attracting global attention and investment. Subsequently, the emergence of new generation blockchain platforms such as Ethereum further expanded the application fields.

The characteristics of blockchain include decentralization, immutability, transparency, security and programmability. Each data block is linked to the previous block, forming a continuous chain, ensuring the integrity of the transaction history. Smart contract technology makes the blockchain programmable and supports a wider range of applications [5].

Blockchain is widely used in finance, supply chain, medical, real estate and other fields. Although it still faces scalability and regulatory challenges, it has become a powerful tool to change traditional business and social models, with huge potential for the future