Towards a reference architecture for digital product passports in engineering <jats:title>ABSTRACT:</jats:title> <jats:p>Digital product passports (DPP) are intended to provide reliable, interoperable information throughout the product lifecycle, enabling compliance, transparency, and circularity. This paper seeks to address the question of how a DPP can be effectively implemented in the field of engineering, developing a referenced, industry-independent architecture for this purpose. The layers for data, communication, logical architecture, functions, and potential are derived from regulation and practice; integration, interoperability, and validation requirements are discussed using a use case.</jats:p> 6 1601-1610 1601-1610 Cambridge University Press (CUP)