Acknowledgments

This book exists because Georgiy Treyvus, CloudStreet Product Manager, asked for it and scoped it in a single sentence that set the tone for every chapter:

Proof of Work vs Proof of Stake — real tradeoffs, real math, no moonboy energy. Understand consensus, finality, Sybil resistance, and why blockchains are a solution to a very specific problem.

Thanks, Georgiy. The book tries to earn that brief.