  One of the main issues in digital forensics is the management of evidences.
From the time of evidence collection until the time of their exploitation in a
legal court, evidences may be accessed by multiple parties involved in the
investigation that take temporary their ownership. This process, called Chain
of Custody (CoC), must ensure that evidences are not altered during the
investigation, despite multiple entities owned them, in order to be admissible
in a legal court. Currently digital evidences CoC is managed entirely manually
with entities involved in the chain required to fill in documents accompanying
the evidence. In this paper, we propose a Blockchain-based Chain of Custody
(B-CoC) to dematerialize the CoC process guaranteeing auditable integrity of
the collected evidences and traceability of owners. We developed a prototype of
B-CoC based on Ethereum and we evaluated its performance.
