Transformation of criminal proceedings in the context of digitalisation: admissibility of evidence and prospects for integrating blockchain technologies into law enforcement practice

Abstract

The digital transformation of criminal justice systems is reshaping investigations, prosecutions and court proceedings by changing how evidence is generated, preserved, verified and evaluated. This structured review examines the admissibility of digital evidence and the prospects for integrating blockchain technologies into law enforcement practice through a methodologically transparent synthesis of legal, forensic, governance, and computer-science literature. The analysis covers electronic case management, digital evidence lifecycle controls, blockchain-enabled chain-of-custody systems, smart-contract-assisted workflows, privacy-preserving architectures and cross-border evidentiary recognition. The review develops a blockchain-enabled evidentiary governance framework that links digital evidence generation, chain-of-custody management, blockchain verification, legal admissibility, and judicial trust outcomes. It also distinguishes established findings, such as the operational value of electronic case management and cryptographic verification, from emerging pilot evidence and future hypotheses concerning automated enforcement, cross-jurisdictional ledgers and autonomous justice systems. The synthesis shows that blockchain can strengthen evidentiary integrity when deployed as a governed verification layer combining permissioned architecture, off-chain evidence storage, on-chain metadata, validated consensus rules and auditable institutional oversight. However, its implementation remains constrained by governance failures, smart contract vulnerabilities, oracle and data-quality risks, scalability limits, privacy conflicts, legal uncertainty, institutional resistance and cost-benefit trade-offs. The review concludes that criminal justice digitalisation requires socio-technical governance rather than technological substitution, with legal reform, professional capacity, interoperability standards and rights-preserving design forming the foundation for trustworthy digital proceedings.