This document provides guidelines for managing and auditing Digital Custody Metadata (DCM), enabling stakeholders to identify and audit custody ownership for CBRNE digital evidence items in the digital chain of custody (dCoC). It proposes a metadata structure to manage resources assigned to a CBRNE mission and comply with good data governance practices, raising awareness at each custody transfer point.

The information flow within the dCoC is modelled using the Business Process Model and Notation (BPMN) to specify the DCM governance workflow. This standard notation provides a formal representation that helps understand the challenges associated with the DCM. The goal is to focus on the metadata structures required to manage digital asset custodians while outlining the data to be considered when specifying a DCM governance workflow.

This document is the second part of two Technical Specifications (TS) on the provision of DCM services for managing data related to the custody of CBRNE digital evidence items.