NPTEL Blockchain and its Applications Week 9 Assignment Answers 2025
1. Which of the following is true about Single Sign-on?
a. The same identity can be used to access multiple services
b. Decentralized providers always maintain the identity of individuals participating in single sign-on for each service
c. All individuals always use a fixed same identity for every one of them together
d. All identity holders are also always identity providers
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2. Which of the following statements regarding Solidity is true?
a. Solidity compiler compiles a solidity program to bytecode which is executed by Ethereum Virtual Machine.
b. Solidity interpreter always executes the program with Ethereum Virtual Device.
c. Solidity interpreter is responsible for executing smart contracts in Ethereum nodes.
d. Solidity program is compiled to high level ascii code which is executed by Ethereum node’s
interpreter.
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3. Which of the following statements related to Algorand is invalid?
a. A block is prepared
b. The block is propagated through gossiping, Algorand runs Byzantine agreement on the block
c. Prepare the digital signature and propagate
d. A committed block is purged
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4. Which of the following is true about selecting the random committee in the Algorand network?
a. There is a dedicated node that chooses the nodes to form the committee
b. A distributed algorithm decides the list of nodes participating in the committee, and the committee members are always pre-decided and fixed
c. A specific pool of nodes chosen are given the responsibility of forming the committee
d. The nodes can take part as committee members by winning a local computation
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5. Which of the following comes with Verifiable Credentials as a native inbuilt feature?
a. Ethereum
b. Litecoin
c. Hyperledger Aries
d. Solidity
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6. Consider the following statement – “Say Alice has generated two Distributed Identifiers (DID), DID1 and DID2, for her pairwise relationships maintained in Hyperledger Indy and used in Hyperledger Aries”. Which part of the above statement is false with respect to the concepts of Hyperledger Indy and Aries?
a. Generation of DID by Alice
b. Assignment of SEED to Steward
c. Acceptance of incoming invitation by Alice
d. Saving DID metadata always in a centralized Identity ledger
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7. In Verifiable Credential (VC) scheme
a. The verifiable credentials can be verified by the issuer only.
b. The verifiable credentials can be verified by the holder only.
c. The verifiable credentials can be verified by the verifier (who requests for verifiable presentations) only.
d. Verifiable credentials can be verified by issue, holder, and verifier.
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8. Data transfer is an important aspect of interoperability in which of the following permissioned
blockchains?
a. Hyperledger Indy
b. Ethereum
c. Hyperledger Fabric
d. Hyperledger Ursa
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9. Which of the following is/are true for Hyperledger Indy and related Decentralized Identifier (DID) context. Please choose all possible correct answers.
a. Digital representation of physical identity and Individuals can control the usage of their own
identity
b. Facilitates Verifiable presentation (VP) of the ID
c. Indy credential schema defines the structure for Verifiable Credential templates
d. Self-Sovereign Identity (SSI) uses DID as the backbone of its identity handling.
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10. Which of the following statements is false in context to Byzantine Fault Tolerant (BFT) protocol in general?
a. The system can operate correctly as long as the number of faulty nodes does not exceed the
allowable threshold proportion of faulty nodes.
b. Classic BFT Protocol is used in a permissioned system.
c. RAFT is a type of BFT protocol
d. The system assumes all the nodes are honest
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