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CBDH Smart Contract Development Flashcards

6 cards from real CBDH practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In Hyperledger Fabric, what language is primarily used to write chaincode (smart contracts)?

    Answer: Go

    Hyperledger Fabric supports chaincode written in Go, JavaScript (Node.js), and Java, with Go being the most commonly used language.

  2. Which interface must a Fabric chaincode implement to be valid?

    Answer: Chaincode

    All Hyperledger Fabric chaincode must implement the Chaincode interface, which requires Init and Invoke methods.

  3. What does the `stub.PutState(key, value)` function do in Fabric chaincode?

    Answer: Writes or updates a key-value pair on the ledger

    PutState writes or updates a key-value pair in the world state ledger during chaincode execution.

  4. Which chaincode function is invoked when the chaincode is first instantiated or upgraded?

    Answer: Init()

    The Init() function is called during chaincode instantiation or upgrade, allowing initialization of ledger state.

  5. What is the purpose of `stub.GetState(key)` in Hyperledger Fabric chaincode?

    Answer: Retrieves the value associated with a key from the world state

    GetState retrieves the byte-array value associated with the specified key from the channel's world state.

  6. In Fabric chaincode, what does `stub.GetTxID()` return?

    Answer: The unique transaction ID of the current invocation

    GetTxID returns the transaction ID that uniquely identifies the current transaction proposal being processed.

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Sources & references

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  1. blockchaintrainingalliance.com — Test delivery, passing score, score release, test dates, fees, exam format, time limit · verified Oct 2026