Blockchain Technology Applications in Security and Privacy
Summary
Blockchain is a decentralised ledger technology that ensures immutability, transparency and resilience against tampering. By distributing transaction records across a peer-to-peer network and using cryptographic hashing, it offers robust defence against data manipulation and unauthorised access. Consensus mechanisms such as proof-of-work or proof-of-stake validate entries without reliance on central authorities, reducing single points of failure. In security applications, blockchain facilitates secure identity management, fraud prevention in financial systems and tamper-proof audit trails. Privacy is enhanced through permissioned architectures, advanced cryptographic primitives and anonymisation techniques, including zero-knowledge proofs and ring signatures. Sectors from supply chain logistics and energy trading to healthcare and IoT leverage blockchain to secure data flows, enforce access controls and automate agreements via smart contracts. Despite its promise, the technology faces challenges in scalability, interoperability, regulatory alignment and energy efficiency. Emerging solutions—layer-two protocols, sharding, homomorphic encryption and decentralised identity frameworks—aim to balance performance with stringent security and privacy requirements, underscoring blockchain’s evolving role in safeguarding digital ecosystems globally.
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Blockchain Technology Applications in Security and Privacy publication trend
The graph below shows the total number of articles in blockchain technology applications in security and privacy across all publications each year (not limited to Nature Index journals).
Technical terms
Distributed ledger: A synchronised database maintained across multiple nodes to record transactions in a tamper-resistant manner.
Consensus algorithm: A protocol by which network participants agree on the validity of transactions and the state of the ledger.
Smart contract: Self-executing code stored on the blockchain that automatically enforces predefined conditions of an agreement.
Permissioned blockchain: A blockchain network where participation and transaction validation are restricted to authorised entities.
Zero-knowledge proof: A cryptographic technique enabling one party to prove knowledge of information without revealing the information itself.
Homomorphic encryption: An encryption method allowing computations to be performed on ciphertexts, producing encrypted results that decrypt to the correct outcome.
References
- Using blockchain to signal quality in the food supply chain: The impact on consumer purchase intentions and the moderating effect of brand familiarity. International Journal of Information Management (2023).
- The Evolution of Blockchain Technology: Applications, Challenges, and Future Directions. Decision Making Advances (2024).
- A Decentralized Privacy-Preserving Healthcare Blockchain for IoT. Sensors (2019).
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