This seminar gives a methodical look at the current status of privacy an‎d security in blockchain systems, pointing out both the pros an‎d cons of this game-changing technology. Blockchain was first designed to support cryptocurrencies, but it has now grown to include many other areas, such as healthcare, banking, an‎d supply chain management. Even while blockchain is better since it is decentralized, unchangeable, an‎d open, it is still vulnerable to a number of security risks, including Sybil attacks, 51% attacks, an‎d smart contract exploits. Also, its clear design makes privacy a big problem, with dangers of deanonymization an‎d problems with rules like the GDPR. The session looks at countermeasures an‎d privacy-enhancing technologies like Zero Knowledge Proofs, ring signatures, an‎d permissioned architectures in a critical way. It also talks about the new effects of quantum computing an‎d AI-driven security models. The discussion concludes that the continued evolution of blockchain necessitates a harmonious mix of cryptography innovation, regulatory adaption, an‎d ethical data governance to guarantee sustainable, safe, an‎d privacy-preserving blockchain applications.

2/18/2026 12:00:00 AM

89724

1404/11/30

A Review of Security an‎d Privacy on Blockchain: Challenges, Properties, an‎d Countermeasures

Keywords: Blockchain Security , Privacy Challenges , Smart Contract Vulnerabilities , Zero Knowledge Proofs , Consensus Attacks, Regulatory Compliance