Proposal to establish Chain of Custody provisions for Automotive Life Cycle Assessment specifying five models-Identity Preserved, Segregation, Controlled Blending, Mass Balance, and Book and Claim-representing standardized approaches for collecting and managing company-specific information across supply chain settings. The Book and Claim model shall not be used. Government authorities reserve rights to define implementation rules specifying how Chain of Custody approaches are applied, based on alignment with global standards such as ISO and the GHG Protocol and the upcoming revision of the EF Recommendation (2279/2021). Minimum requirements shall be established for Mass Balance application to prevent diverse interpretations and misuse.