NPTEL Blockchain and its Applications Assignment 3 Answers 2022

NPTEL Blockchain and its Applications Assignment 3

Are you looking for the Answers to NPTEL Blockchain and its Applications Assignment 3? This article will help you with the answer to the National Programme on Technology Enhanced Learning (NPTEL) Course “ NPTEL Blockchain and its Applications Assignment 3

What is Blockchain and its Applications?

In the last few years, Blockchain technology has generated massive interest among governments, enterprises, and academics, because of its capability of providing a transparent, secured, tamper-proof solution for interconnecting different stakeholders in a trustless setup. In January 2021, the Ministry of Electronics and Information Technology (MeiTY), Government of India, published the first draft of the “National Strategy on Blockchain” that highlights 17 potential applications that are of national interest.

Against this backdrop, this subject will cover the basic design principles of Blockchain technology and its applications over different sectors. Additionally, the course also provides tutorials on setting up blockchain applications using one of the well-adopted permissionless blockchain platforms – Ethereum, and one permission blockchain platform – Hyperledger.


Average assignment score = 25% of the average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF THE AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Below you can find the answers for NPTEL Blockchain and its Applications Assignment 3

NPTEL Blockchain and its Applications Assignment 3 Answers:-

Q1. The transaction Merkle Tree root value in a Bitcoin block is calculated using ____________.

a) Number of transactions
b) None
c) Previous block’s hash
d) Hash of transactions

Answer: d) Hash of transactions

Q2. Proof of work is the _________ used by Bitcoin blockchain and Ethereum Byzantium Metropolis blockchain.

a) Transaction confirmation
b) Incentive function
c) Consensus Protocol
d) Trust function

Answer: c) Consensus Protocol

Q3. Inspect and explore block #490624 using this link to solve the below question. What is the hash of the previous block for Bitcoin block #490624? Copy and past the answer into the box below.

Answer: 0000000000000000004239

Q4. Bitcoin Scripting Language:

a) Turing Complete
b) Supports Cryptography
c) Stack Based
d) Supports infinite time/memory

Answer: b), c)

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Q5. Which of the following bitcoin scripts will generate a TRUE outcome?
i. scriptSig: <sig>
scriptPubKey: <pubKey> OP_DUP OP_HASH256 <pubKeyHash>

ii. scriptSig: <pubKey>
scriptPubKey: OP_HASH160 <pubKeyHash> OP_EQUAL

iii. scriptSig: <pubKey>
scriptPubKey: <pubKey> OP_EQUALVERIFY

iv. scriptSig: <sig>
scriptPubKey: <pubKey> OP_CHECKSIG

a) i, ii, iii
b) iii, iv
c) i, ii, iv
d) i, iii, iv

Answer: a) i, ii, iii

Q6. What is nonce?

a) The number miners run through to generate a correct hash
b) The transaction id number
c) A miners ASIC chip array
d) The generator point used in elliptic curve cryptography

Answer: a) The number miners run through to generate a correct hash

Q7. Which one of the following opcodes is needed to remove the top stack item.


Answer: a) OP_DROP

Q8. Which of these fields is present in a Bitcoin block summary?

a) Gas Used
b) Gas Limit
c) Difficulty
d) Private Key of the Sender

Answer: c) Difficulty

Q9. If the four-byte difficulty bits in hex form are 0x1b0404cb, and the target value is calculated using X*2^(Y), what is the values for X and Y respectively,

a) X = 0x0404cb, Y = 0x1b
b) X = 0x0404cb, Y = 0x18
c) X = 0x0404cb, Y = 0xc0
d) X = 0x1b0404, Y = 0xcb

Answer: a) X = 0x0404cb, Y = 0x1b

Q10. In bitcoin block header, the block identifier is calculated

a) Using Double SHA256 on the current block header
b) Using SHA256 on the current block header
c) Using Double SHA256 on the previous block hash
d) Using Double SHA256 on the Difficulty bits

Answer: a) Using Double SHA256 on the current block header

NPTEL Blockchain and its Applications Assignment 1

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