Conference paper Open Access
A Blockchain based Witness Model for Trustworthy Cloud Service Level Agreement Enforcement
Zhou, Huan;
Ouyang, Xue;
Ren, Zhijie;
Su, Jinshu;
de Laat, Cees;
Zhao, Zhiming
Traditional cloud Service Level Agreement (SLA)
suffers from lacking a trustworthy platform for automatic
enforcement. The emerging blockchain technique brings in an
immutable solution for tracking transactions among business
partners. However, it is still very challenging to prove the credibility
of possible violations in the SLA before recording them onto
the blockchain. To tackle this challenge, we propose a witness
model using game theory and the smart contract techniques.
The proposed model extends the existing service model with
a new role called “witness” for detecting and reporting service
violations. Witnesses gain revenue as an incentive for performing
these duties, and the payoff function is carefully designed in a way
that trustworthiness is guaranteed: in order to get the maximum
profit, the witness has to always tell the truth. This is analyzed
and proved through game theory using the Nash equilibrium
principle. In addition, an unbiased sortition algorithm is proposed
to ensure the randomness of the independent witnesses selection
from the decentralized witness pool, to avoid possible unfairness
or collusion. An auditing mechanism is also introduced in
the paper to detect potential irrational or malicious witnesses.
We have prototyped the system leveraging the smart contracts
of Ethereum blockchain. Experimental results demonstrate the
feasibility of the proposed model and indicate good performance
in accordance with the design expectations.
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- Publication date:
- April 27, 2019
- DOI:
-
- Keyword(s):
- Blockchain Cloud
- Grants:
-
European Commission:
-
ENVRI PLUS - Environmental Research Infrastructures Providing Shared Solutions for Science and Society (654182)
-
SWITCH - Software Workbench for Interactive, Time Critical and Highly self-adaptive cloud applications (643963)
- ARTICONF - smART socIal media eCOsytstem in a blockchaiN Federated environment (825134)
-
ENVRI PLUS - Environmental Research Infrastructures Providing Shared Solutions for Science and Society (654182)
- Meeting:
- IEEE INFOCOM 2019 (INFOCOM 2019), Paris, 27-30, April 2019
- License (for files):
- Creative Commons Attribution 4.0 International