Web3-based role and token data access
the case of building material passports
Jens J. Hunhevicz (Swiss Federal Laboratories for Materials Science and Technology (Empa), ETH Zürich)
David F. Bucher (ETH Zürich)
Ranjith K. Soman (TU Delft - Civil Engineering & Geosciences)
Meliha Honic (ETH Zürich)
Daniel M. Hall (TU Delft - Design & Construction Management)
Catherine De Wolf (ETH Zürich)
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Abstract
Long-term access to lifecycle data is key to a successful transition towards a circular built environment. However, the underlying technology often remains centralized and risks becoming inaccessible over time. In this paper, we investigate whether decentralized access methods using Web3, i.e. blockchain and decentralized data storage protocols, can help to mitigate this limitation. We implement Web3 data access mechanisms for a material passport with both a role-based and a token-based smart contract. Initial results suggest that Web3 offers a promising approach to data access over the lifecycle of a built asset-but only with careful design choices.