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Blockchain: Blockchain is a decentralized distributed ledger technology that integrates cutting-edge technologies such as distributed storage, peer-to-peer transmission, consensus mechanisms, and cryptography. It ensures data immutability and full traceability through a chain block structure. Many people think of Bitcoin when they hear blockchain, but in fact, it is like a super ledger, only this ledger has three "super skills":
1. "No one can change the ledger": For example, if you and your neighbor partner to buy rice, every transaction is recorded on the community bulletin board (blockchain), and everyone in the building can see it. If someone wants to secretly change the record, they would have to convince everyone at the same time—almost impossible!

2. "No need for intermediaries": In the past, renting a house required finding an agent. Now, with blockchain, landlords and tenants can directly sign "smart contracts" (protocols written in code). When the contract expires, the deposit is automatically refunded, saving on agent fees and eliminating the worry of being scammed.

3. "Data-embedded Tracker": When you buy imported milk powder, scanning the QR code on the packaging allows you to see every step of its journey from the farm, factory, customs to the supermarket. Counterfeit? Diversion? Don't even think about it!