3.1.2. Evidence Log

The evidence log keeps track of user interactions with digital evidence. This Evidence Log is implemented on the blockchain and contains information on each piece of evidence on which decision-making depends, including its ID, a description, the submitter's (creator's) identity, and the full history of owners up to the present one, including the dates of ownership transfers. The evidence log is built on top of a peer-to-peer network that includes all authorized entities. A network of this kind may be split into two distinct groups of nodes [15,21]: (1) validator nodes: they are primarily responsible for maintaining a copy of the blockchain; validating transactions; and creating, proposing, and adding blocks to the chain (i.e., participate in the consensus protocol). (2) Lightweight nodes: they are considered clients of the chain since they just issue transactions and depend on validators to add and validate them.
