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given a stack of punched cards encoding transactions, they produced a ledger
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2) What is Blockchain?A blockchain is a distributed digital ledger that allows for the secure storage of data. By recording any kind of information—such as bank account transactions, the ownership of Non-Fungible Tokens (NFTs), or Decentralized Finance (DeFi) smart contracts—in one place, and distributing it to many different computers, blockchains ensure that data can’t be manipulated without everyone in the system being aware.
tasks = append(tasks, t)。业内人士推荐51吃瓜作为进阶阅读