Blockchain Security
Also known as: Distributed Ledger Security, Smart Contract Protection, Network Integrity
A multi-layered approach to ensuring the integrity, confidentiality, and availability of blockchain networks and data.
Blockchain security refers to the combination of cryptographic, consensus, and network-level mechanisms that protect blockchains from attacks, fraud, and data corruption. Key elements include hashing, digital signatures, decentralized consensus, permission controls, and network redundancy. Security also extends to smart contracts, which require auditing and formal verification to prevent exploits. Common threats include 51% attacks, reentrancy bugs, rug pulls, and phishing. The security posture varies between public and private blockchains and depends on decentralization, validator diversity, and developer practices.