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The ubiquitous nature of digital devices such as smartphones, laptops and the IoT, makes digital evidences extremely relevant for criminal investigations on all kinds of criminal behaviour, including contraband, human trafficking, child pornography and murder. The LOCARD’s holistic platform aims to ensure the chain of custody through the forensic workflow, by storing digital evidence metadata in a blockchain. Blockchain technology, which has boomed worldwide over recent years, employs cryptographic and algorithmic methods to log and synchronise data across the network in an immutable way. In this sense, the use of a blockchain within the LOCARD platform endows trustworthiness, integrity, authenticity and transparency throughout the entire forensic workflow, i.e. from the collection of digital evidences, going through the processing of the stored data to realise incidents reporting, to the final prosecution in a court of law. The blockchain’s properties prevent disputing the chain of custody of digital evidences during a judicial procedure, a common challenge for many law enforcement agencies and forensic laboratories in spite of properly documenting the entire forensic workflows.