Blockchain and its Applications — DU B.Sc. (Hons) Computer Science Previous Year Question Papers

Parts of`a question must be answered together. (a) Mention any two advantages of using smart contracts over traditional paper-based contracts. (b) Give any two real-world examples wher; a consortium blockchain is used. (c) How does a distributed ledger ensure trust among participants without a central (d) (e) authority? If one bit of an input to a hash function is changed, does the output change slightly or completely? Name the property that describes this. Explain briefly what is commodity money and digital currency. Give one example (7) (b) What is the difference betweeL a client-server network and a peer-to-peer network? Explain with the help of a diagram. (a) (b) (c) What is "gas" in Ethereum? Why is itrequired? Wliat is a mining pool? Why do minersjoin a mining pool? What is difficulty adjustment in Bitcoin? After how many blocks does it happen? (5) (b) Explain any two SHA-2 hash functions. Which one is used in the Bitcoin (7) (a) What is digital sigiiature? Briefly describe the signing and verification steps (5) required in digital signature. ® List and explain flve application areas ofblockchain technology. (c) Differentia`te between a soft fork and a hard fork. Give one real-world example of each. (a) What is proof of Bum (PoB)? Explain with the help of a suitable example. (5) ® What is Proof of Capacity (PoC)? Which resource is used in P6C instead of (5) computing p ower? (c) Explain any two differences between Proof of Work (Pow) and Practical (5) Byzantine Fault Tolerance ®BFT). (a) Differentiate between a public blockchain and a private blockchaln with the help of suitable example. co) Explain Solidity and discuss any four key features that make it suitable for (8) developing smart contracts on the Ethereum blockchain.