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← Blockchain and shared state

Learning path

From records to evidence

Five questions about records, signatures, facts and consensus.

What does an “on-chain” record actually tell you? Start with shared records, check content and signatures, distinguish outside facts from confirmation, then decide whether a chain is needed. Each lesson stands alone and ends with a question that tests whether you have confused one kind of evidence with another.

The path develops questions from Chapters 1, 6, 10 and 11 of 《区块链实战》 using current protocol references. Continue to the layers of blockchain for specific chains and execution mechanisms.

Along this path

  1. What does a blockchain let participants agree on?

    Two requests can be signed correctly and still conflict. Their order matters.

  2. What do hashes and signatures prove?

    Checking whether a file changed is different from checking who signed it.

  3. Why can’t a blockchain guarantee truthful inputs?

    Recording a claim and checking the event it describes are different jobs.

  4. Why does “immutable” need conditions?

    Receiving a transaction, including it in a block and finalizing history provide different evidence.

  5. When is a database enough?

    Identify the conflict that needs shared resolution before choosing a chain.