# Blockchain 101 #2 / Answers

**Published by:** [zzmasoud](https://paragraph.com/@zzmasoud-2/)
**Published on:** 2022-04-10
**URL:** https://paragraph.com/@zzmasoud-2/blockchain-101-2-answers

## Content

Hey guys, here are the answers of Blockchain 101 #2 quiz: related to the first question Q: Name the common type of ledgers that can be considered by users in Blockchain? A: Decentralized network / (B) Centralized network / (C) Distributed network Q: What is the task of miners in a blockchain network? A: Miners are nodes that compete for a reward by calculating the correct nonce to make a transaction possible. Q: What does a nonce do? A: Adds randomness to the hash Q: How many characters does the SHA256 hash produce? A: 64 Q: How is blockchain achieve immutability? A: passing the hash of the current block to the next block Q: ______ are the part that keeps a copy of the blockchain, verifies transaction signatures, and throws out invalid transactions. A: nodes Q: which phrases are TRUE about Merkle Tree? (multiple choice) A: is a data structure. / non leaf nodes don’t contain transaction IDs. /leaf nodes are the transaction IDs. Q: What are the properties of a Hash Function ? (multiple choice) A: Fixed Length / One-way function Q: Bob wants to verify Alice's signature. So he has to use ______. A: Alice's public key Q: The "nonce" is _______. A: The number that miners solve

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