zkMarket : Privacy-preserving Digital Data Trade System via Blockchain

Seungwoo Kim; Semin Han; Seongho Park; Kyeongtae Lee; Jihye Kim; Hyunok Oh

Paper 2024/1775

zkMarket : Privacy-preserving Digital Data Trade System via Blockchain

Seungwoo Kim

, Kookmin University

Semin Han

, Hanyang University

Seongho Park

, Hanyang University

Kyeongtae Lee

, Hanyang University

Jihye Kim

, Kookmin University

Hyunok Oh

, Hanyang University

Abstract

In this paper, we introduce zkMarket, a privacy-preserving fair trade system on the blockchain. zkMarket addresses the challenges of transaction privacy and computational efficiency. To ensure transaction privacy, zkMarket is built upon an anonymous transfer protocol. By combining encryption with zero-knowledge succinct non-interactive arguments of knowledge (zk-SNARK), both the seller and the buyer are enabled to trade fairly. Furthermore, by encrypting the decryption key, we make the data registration process more concise and improve the seller's proving time by leveraging commit-and-prove SNARK (CP-SNARK) and our novel pseudorandom generator, the matrix-formed PRG (MatPRG). Our evaluation demonstrates that zkMarket significantly reduces the computational overhead associated with traditional blockchain solutions while maintaining robust security and privacy. The seller can register 1MB of data in 3.2 seconds, while the buyer can generate the trade transaction in 0.2 seconds, and the seller can finalize the trade in 0.4 seconds.

Metadata

Available format(s): PDF
Category: Applications
Publication info: Preprint.
Keywords: Zero-knowledge Proof Smart Contract Fair exchange
Contact author(s): donny11489 @ gmail com
seminhan @ hanyang ac kr
seonghopark @ hanyang ac kr
rsias9049 @ hanyang ac kr
jihyek @ kookmin ac kr
hoh @ hanyang ac kr
History: 2024-11-01: approved; 2024-10-31: received; See all versions
Short URL: https://ia.cr/2024/1775
License: CC BY

BibTeX

@misc{cryptoeprint:2024/1775,
      author = {Seungwoo Kim and Semin Han and Seongho Park and Kyeongtae Lee and Jihye Kim and Hyunok Oh},
      title = {{zkMarket} : Privacy-preserving Digital Data Trade System via Blockchain},
      howpublished = {Cryptology {ePrint} Archive, Paper 2024/1775},
      year = {2024},
      url = {https://eprint.iacr.org/2024/1775}
}