Blockchain Security Basics

Summary

The security properties (and real vulnerabilities) of blockchain systems — distributed consensus and cryptographic linking provide integrity guarantees, but smart contracts and exchanges remain common attack targets.

• 1Read a conceptual overview of how blockchain's cryptographic linking prevents tampering.
• 2Research a real smart contract vulnerability (like a reentrancy attack) at a high level.
• 3Understand blockchain security as its own specialized, growing niche within cybersecurity.