Secure and Efficient Agreement Signing Atop Blockchain and Decentralized Identity

Songlin He, Tong Sun, Qiang Tang, Chase Wu, Nedim Lipka, Curtis Wigington, Rajiv Jain

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In recent years, we have witnessed an exorbitant growth of online interactions, especially during the pandemic of COVID-19, which requires diversified digital agreements in different application scenarios. In essence, multi-party agreement signing (MPAS) can be reckoned as a special case of the multi-party fair exchange (MPFE) for signatures over a digital agreement. However, such general MPAS protocols have not seen wide adoptions in practice, possibly due to the lack of incentives to maintain the signing platform. Practically, monetary-incentivized enterprises exist to act as a trusted third party (TTP) and provide signing services. However, such an agreement signing flow still suffers from certain limitations in terms of insecure and inefficient operations. To this end, we propose a secure and efficient framework for multi-party agreement signing based on decentralized identity, blockchain and decentralized storage network (DSN). The framework consists of two subsystems where the identity subsystem contains an extensible three-tier user identity model atop decentralized identity, and the agreement signing subsystem, empowered by the identity subsystem, DSN and several novel designs, achieves security and efficiency design goals. For the convenience of explanation, we suppose that a centralized signing service provider (SSP) is properly involved, i.e., sensitive information is still protected against the SSP, and acts as a TTP to ensure the crucial properties such as fairness and coordinate the signing activities. Our design is also compatible with other methods, e.g., ensuring fairness via blockchain, which removes the single point of failure of SSP. We prototype the framework and the performance evaluation shows effectiveness and efficiency.

Original languageEnglish (US)
Title of host publicationBlockchain and Trustworthy Systems - 4th International Conference, BlockSys 2022, Revised Selected Papers
EditorsDavor Svetinovic, Yin Zhang, Xiaoyan Huang, Xiapu Luo, Xingping Chen
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages15
ISBN (Print)9789811980428
StatePublished - 2022
Event4th International Conference on Blockchain and Trustworthy Systems, Blocksys 2022 - Chengdu, China
Duration: Aug 4 2022Aug 5 2022

Publication series

NameCommunications in Computer and Information Science
Volume1679 CCIS
ISSN (Print)1865-0929
ISSN (Electronic)1865-0937


Conference4th International Conference on Blockchain and Trustworthy Systems, Blocksys 2022

All Science Journal Classification (ASJC) codes

  • General Computer Science
  • General Mathematics


  • Agreement signing
  • Blockchain
  • Decentralized identity
  • Decentralized storage networks
  • Self-sovereign identity


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