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Blockchain
Unit 1
Blockchain Basics
Introduction to Blockchain
Blockchain Mechanics
Security in Blockchain
Unit 2
Blockchain Applications
Blockchain in Finance
Blockchain in Supply Chain
Blockchain in Healthcare
Unit 3
Blockchain Future Trends
Scalability in Blockchain
DeFi and Blockchain
Interoperability in Blockchain
Unit 1 • Chapter 3
Security in Blockchain
Summary
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Concept Check
What is a common security challenge in Blockchain technology?
Smart contracts
Mining rewards
Double spending
51% attack
How can private keys best secure blockchain transactions?
Hashing
Decryption
Public keys
Encryption
Which consensus mechanism aims to prevent double spending in Blockchain?
Proof of Stake
Proof of Work
Delegated Proof of Stake
Byzantine Fault Tolerance
What is the purpose of using a nonce in Blockchain mining?
To validate transactions
To find a valid block hash
To secure private keys
To execute smart contracts
How can smart contracts enhance security in Blockchain applications?
Automate trustless execution
Decrease transparency
Centralize control
Increase transaction costs
Check Answer
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Blockchain Mechanics