NPTEL Blockchain and its Applications Week 8 Assignment Answers 2025
1. Which of the following is/are correct?
a. PoW always ensures consensus finality
b. PoW does not ensure consensus finality
c. PBFT protocol always ensures consensus finality
d. PBFT protocol does not ensure consensus finality
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2. Which of the following is/are true regarding the CoSi protocol?
a. Witnesses are organized in a tree structure
b. Three rounds of PBFT can be emulated using one round of CoSi protocol
c. It can be used to sign a message by multiple authorities collectively
d. Three rounds of PBFT can be emulated using two rounds of CoSi protocol
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3. Which of the following factors) distinguish Bitcoin-NG from Bitcoin?
a. Decoupling the leader election and transaction serialization
b. Use of key blocks and macroblocks
c. Bitcoin-NG has lower transaction throughput as compared to Bitcoin
d. Leader election using PBFT
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4. Which of the following is/are true regarding Bitcoin-NG?
a. Microblock generation rate is lower than the key block generation rate
b. Microblock generation rate is higher than the key block generation rate
c. The interval between the generation of two key blocks is exponentially distributed
d. The key block contains the ledger entries
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5. Which of the following is/are correct?
a. PBFT protocol ensures total ordering of transactions
b. Bitcoin has lower node scalability as compared to Standard BFT protocols
c. Standard BFT protocols never produces lower transaction throughput as compared to Bitcoin
d. Bitcoin-NG has higher node scalability as compared to Standard bitcoin protocols in general
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6. What is the primary function of a Fabric smart contract (Chaincode)?
a. Performing cryptocurrency mining
b. Defining the business rules and logic in the ledger
c. Defining consensus algorithms
d. Monitoring the transaction throughput
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7. Which API is used for implementing Fabric chaincodes?
a. hyperledger-client-api
b. smart-contract-builder
c. fabric-contract-api
d. fabric-identity-manager
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8. Which of the following is/are true regarding fabric transactions?
a. The transactions should be endorsed by peers
b. The transactions are committed without validation
c. A transaction does not change the world state
d. World state holds current updated consensus view
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9. Which of the following factor(s) limits Bitcoin’s scalability?
a. Low transaction fees
b. Fixed block size
c. Wallet address complexity
d. Fixed block frequency
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10. Which of the following is/are correct regarding Schnorr Multisignature in CoSi protocol?
a. It is difficult to verify the signature
b. Signature can be verified using a single collective public key
c. It is easy to verify the signature
d. It relies on group G of any composite order
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