Blockchain and cryptocurrencies

1. How does Proof of Stake (PoS) work in a Blockchain? How does the security of (PoS)
can be maintained? [150-250 words]
2. How does Proof of work (Pow) work in a Blockchain? How does the security of Pow
can be maintained? [150-250 words]
3. You are hired to develop a blockchain based health system. Describe how you can
provide the privacy and security of the health information. [150-250 words]
4. Apart from preventing the exposure of sensitive contractual information, what are the
other reasons that security is important in a system that administers Smart Contracts.
[150-250 words]
5. Airbnb is an online marketplace for arranging or offering lodging, primarily
homestays, or tourism experiences. The company does not own any of the real estate
listings, nor does it host events; it acts as a broker, receiving commissions from each
booking. How can you automate the Airbnb services with smart contract? [150-250
6. How to trace ransomware payment in crypto-currency (bitcoin) network? How
machine learning algorithm can help you to improve your approach? [150-250 words]
7. What does it mean the Ethereum is “Turing complete”? and, how does the Ethereum
provide “Tuning completeness”? [200-300 words]
8. You are hired as a consultant to improve the service delivery of an education provider.
Write down your suggestions to improve their services using blockchain. [200-300
9. If someone wants to launder money using crypto-currencies what are the available
obfuscation techniques s/he has? [200-300 words]
10. You are hired by a blockchain company to improve the scalability of their current
blockchain system, what your consultations will be? [200-300 words]
11. How can you burn crypto-currency? How do you provide block reward if you burn
the currency? [200-300 words]
12. how you can ensure the privacy in blockchain?
13. what problem “Uncle block solve”?
14. How can you improve the scalability and inter-operability in blockchain?
15. when we should and should not use blockchain?

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