An offline delegatable cryptocurrency system

Rujia Li, Qin Wang, Xinrui Zhang, Qi Wang, David Galindo Chacon, Yang Xiang

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


Blockchain-based cryptocurrencies, facilitating the convenience of payment by providing a decentralized online solution, have not been widely adopted so far due to slow confirmation of transactions. Offline delegation offers an efficient way to exchange coins. However, in such an approach, the coins that have been delegated confront the risk of being spent twice since the delegator’s behaviour cannot be restricted easily on account of the absence of effective supervision. Even if a third party can be regarded as a judge between the delegator and delegatee for secure transactions, she still faces the threat of being compromised or providing misleading assure. Moreover, the approach equipped with a third party contradicts the real intention of decentralized cryptocurrency systems. In this paper, we propose DelegaCoin, an offline delegatable cryptocurrency system to mitigate such an issue. We exploit trusted execution environments (TEEs) as decentralized “virtual agents” to prevent malicious delegation. In our scheme, an owner can delegate his coins through offline-transactions without interacting with the blockchain network. We provide a formal model with provable security analysis for our proposed system. We further implement a prototype and provide a preliminary evaluation. The analysis and results demonstrate that our scheme is provably secure and practically feasible.
Original languageEnglish
Title of host publication2021 IEEE International Conference on Blockchain and Cryptocurrency (ICBC)
ISBN (Electronic)9781665435789, 9781665411882
Publication statusPublished - 24 Jun 2021
EventIEEE International Conference on Blockchain and Cryptocurrency - Virtual
Duration: 3 May 20216 May 2021

Publication series

NameIEEE International Conference on Blockchain and Cryptocurrency (ICBC)


ConferenceIEEE International Conference on Blockchain and Cryptocurrency
Abbreviated titleICBC 2021
Internet address


  • Cryptocurrency
  • Offline Delegation
  • Trusted Execution Environments (TEEs)

ASJC Scopus subject areas

  • Accounting
  • Computer Networks and Communications
  • Information Systems and Management
  • Safety, Risk, Reliability and Quality


Dive into the research topics of 'An offline delegatable cryptocurrency system'. Together they form a unique fingerprint.

Cite this