-  How do PoW-based cryptocurrencies address the “double spend”?
- Compare the “punishment mechanisms” adopted by Casper FFG and IOTA?
- Â If you were a member of the Bitcoin community during the DAO attack? Which side would you take or support? Please explain you answer.
- Explain why the Byzantine fault tolerant solution can tolerate up to onethird of the nodes being faulty?
- What are the benefits of adopting the tree-like data structures (e.g., Merkle tree, and Trie) in the blockchain blocks?
- Â How does the Bitcon blockchain achieve data immunity?
- What are the differences between the sidechain and Ethereum’s sharding?
- Choose two anonymous cryptocurrencies and explain the strategies/approaches they adopted to provide user anonymity.
