Blockchain for Cybersecurity

Cybersecurity systems must protect digital identities, data, devices, and transactions against tampering, unauthorisedaccess, and service disruption. Many conventional security architectures rely on centrally managed records and trustedadministrators; these can become attractive targets and may provide limited visibility when logs are altered or distributedacross organisations. This paper presents a proposed blockchain-supported cybersecurity framework that uses a replicatedledger, cryptographic hashes, digital signatures, and policy-based access to strengthen auditability and integrity. Thedesign considers identity and access events, security-log integrity, configuration changes, and controlled sharing of threatindicators. Sensitive payloads are kept off-chain, while the ledger stores hashes, timestamps, references, and authorisedapprovals. The paper describes the motivation, architecture, workflow, implementation plan, evaluation metrics,applications, and limitations. Blockchain is treated as a supporting trust and audit mechanism rather than a replacement forencryption, secure software development, endpoint protection, or incident response. The proposal requires empiricaltesting before any claims about performance or security improvement can be made.