Blockchain Security is not an option, it's a necessity. The Ultimate Blockchain Security Handbook will help you identify and remediate your Blockchain solution bugs before others do. Covering the latest threats and vulnerabilities, as well as effective mitigation strategies, it takes you on a journey from the security foundations of blockchain technology to implementing advanced security solutions for blockchain applications. It helps you identify, assess, and mitigate risks using a variety of tools and techniques, including threat modeling, penetration testing, vulnerability scanning, attack analysis, and security audits. It covers formal verification methods for testing smart contract code, with an application of the K semantic framework. It then explores a range of blockchain security solutions, including zero-knowledge proof architecture, access control design, establishment of robust public key infrastructures, and the implementation of security logging and monitoring tools to track activities effectively. This book is tailored for blockchain developers, architects, security experts, software professionals, and researcherscryptographers seeking in-depth knowledge of blockchain security.