Probability distribution model to analyze the trade-off between scalability and security of sharding-based blockchain networks

Kamalani Aiyar, Malka N. Halgamuge, Azeem Mohammad

Research output: Book chapter/Published conference paperConference paperpeer-review

3 Citations (Scopus)

Abstract

Sharding is considered to be the most promising solution to overcome and to improve the scalability limitations of blockchain networks. By doing this, the transaction throughput increases, at the same time compromises the security of blockchain networks. In this paper, a probability distribution model is proposed to analyze this trade-off between scalability and security of sharding-based blockchain networks. For this purpose hypergeometric distribution and Chebyshev's Inequality are mainly used. The upper bounds of hypergeometric distributed transaction processing and failure probabilities for shards are mainly evaluated. The model validation is accomplished with Class A (Omniledger, Elastico, Harmony, and Zilliqa), and Class B (RapidChain) sharding protocols. This validation shows that Class B protocols have a better performance compared to Class A protocols. The proposed model observes the transaction processing and failure probabilities are increased when shard size is reduced or the number of shards increased in sharding-based blockchain networks. This trade-off between the scalability and the security decides on the shard size of the blockchain network based on the real-world application and the blockchain platform. This explains the scalability trilemma in blockchain networks claiming that decentralization, scalability, and security cannot be met at primary grounds. In conclusion, this paper presents a comprehensive analysis providing essential directions to develop sharding protocols in the future to enhance the performance and the best-cost benefit of sharing-based blockchains by improving the scalability and the security at the same time.

Original languageEnglish
Title of host publication2021 IEEE 18th Annual Consumer Communications and Networking Conference, CCNC 2021
PublisherIEEE
Number of pages6
ISBN (Electronic)9781728197944
ISBN (Print)9781728197951
DOIs
Publication statusPublished - 11 Mar 2021
EventIEEE Consumer Communications & Networking Conference 2021: CCNC 2021 - Virtual, Las Vegas, United States
Duration: 09 Jan 202112 Jan 2021
https://ccnc2021.ieee-ccnc.org/

Publication series

Name2021 IEEE 18th Annual Consumer Communications and Networking Conference, CCNC 2021

Conference

ConferenceIEEE Consumer Communications & Networking Conference 2021
Country/TerritoryUnited States
CityLas Vegas
Period09/01/2112/01/21
OtherIEEE Consumer Communications and Networking Conference, sponsored by IEEE Communications Society, is a major annual international conference organized with the objective of bringing together researchers, developers, and practitioners from academia and industry working in all areas of consumer communications and networking.
Internet address

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