CBDH CBDH Smart Contract Development

Question 1

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

Accepted Answer

Go

Answer

Python

Answer

Ruby

Answer

Rust

Question 2

Which interface must a Fabric chaincode implement to be valid?

Accepted Answer

Chaincode

Answer

ChaincodeInterface

Answer

SmartContract

Answer

LedgerContract

Question 3

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

Accepted Answer

Writes or updates a key-value pair on the ledger

Answer

Reads a value from the ledger

Answer

Deletes a record from the ledger

Answer

Queries historical data

Question 4

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

Accepted Answer

Init()

Answer

Start()

Answer

Deploy()

Answer

Invoke()

Question 5

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

Accepted Answer

Retrieves the value associated with a key from the world state

Answer

Deletes a key from the world state

Answer

Returns the peer's current block height

Answer

Lists all keys in the ledger

Question 6

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

Accepted Answer

The unique transaction ID of the current invocation

Answer

The peer's node ID

Answer

The channel name

Answer

The chaincode version number