In this chapter, we learned about some of the advanced concepts used in blockchain and covered various consensus protocols used in various blockchain implementations. We also looked at some of the key challenges to privacy on blockchain and how solutions such as ZKP can help safeguard privacy. Then, we progressed to discussing smart contracts, one of the core building blocks of blockchain; how they are written; what they are; and how they are executed. We also looked at Dapps, when to use them, and when not to use them. In the next chapter, we will look at some of the general practices used to safeguard Bitcoin and cryptocurrencies in general.
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