Pitfalls in private key generation and signing algorithms that are easy to fall into—honestly, they can really ruin the entire wallet. We have compiled several real cases, thoroughly explaining the issues from the two aspects of key generation and mainstream signing schemes. Each pitfall is accompanied by practical solutions. The core logic is actually very simple—developers must develop correct cryptographic usage habits from the start and not wait until problems occur to fix them. Only then can we plug security vulnerabilities at the source.