Wilson, Stanly, Suwankesawong, Tanapon, Adu-Duodu, Kwabena, Li, Yinhao, Ranjan, Rajiv, Rana, Omer  ORCID: https://orcid.org/0000-0003-3597-2646 and Solaiman, Ellis
2025.
Verifiable auction mechanisms for material reuse in the built environment.
Presented at: 2025 7th International Conference on Blockchain Computing and Applications (BCCA),
Dubrovnic, Croatia,
14-17 October 2025.
2025 7th International Conference on Blockchain Computing and Applications (BCCA).
IEEE,
pp. 895-897.
10.1109/BCCA66705.2025.11229665
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Abstract
Built environments face significant challenges in promoting material reuse due to the lack of trustworthy and transparent trading mechanisms. Existing digital platforms often fail to ensure fairness, bid confidentiality, and auditability. To address this gap, this paper presents the design and implementation of a verifiable auction system for trading reusable construction materials. Built on a Polkadot-based platform, the system supports sealed reverse auctions through a hybrid on-chain/off-chain architecture: encrypted and signed bids are stored in InterPlanetary File System (IPFS), while a Merkle root of valid bids is committed on-chain. Zero-knowledge proofs (ZKPs) enable verification of bid correctness without revealing bid values. Stress testing showed moderate latency from proof generation and IPFS operations, yet performance remained suitable for auctions lasting minutes or hours. The results demonstrate a scalable, privacy-preserving, and auditable auction mechanism that leverages decentralised technologies to advance circular economy goals.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Date Type: | Published Online |
| Status: | Published |
| Schools: | Schools > Computer Science & Informatics |
| Publisher: | IEEE |
| ISBN: | 9798331502966 |
| Funders: | EPSRC |
| Date of First Compliant Deposit: | 15 November 2025 |
| Date of Acceptance: | 20 September 2025 |
| Last Modified: | 17 Nov 2025 11:30 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/182433 |
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