answer these questions carefully please:
1. You are assigned to develop a blockchain-based cross-border supply chain system, what are the aspects you should consider?
2. What the privacy mechanisms are there to protect the user data in the blockchain system ?
3. Describe the Proof of Stake migration process of Ethereum.
4. Why blockchain-based system is not getting mass adaption? What are the challenges? How can we overcome them?
5. What are different governance models in blockchain system? Describe the hard fork mechanism in blockchain. How can we avoid hard fork?