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arXiv · 2102.04875

OptSmart: A Space Efficient Optimistic Concurrent Execution of Smart Contracts

Parwat Singh Anjana·Sweta Kumari·Sathya Peri·Sachin Rathor·Archit Somani
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Abstract

Popular blockchains such as Ethereum and several others execute complex transactions in blocks through user-defined scripts known as smart contracts. Serial execution of smart contract transactions/atomic-units (AUs) fails to harness the multiprocessing power offered by the prevalence of multi-core processors. By adding concurrency to the execution of AUs, we can achieve better efficiency and higher throughput. In this paper, we develop a concurrent miner that proposes a block by executing the AUs concurrently using optimistic Software Transactional Memory systems (STMs). It captures the independent AUs in a concurrent bin and dependent AUs in the block graph (BG) efficiently. Later, we propose a concurrent validator that re-executes the same AUs concurrently and deterministically using a concurrent bin followed by a BG given by the miner to verify the proposed block. We rigorously prove the correctness of concurrent execution of AUs and achieve significant performance gain over the state-of-the-art.

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Parwat Singh Anjana, Sweta Kumari, Sathya Peri, Sachin Rathor, Archit Somani. 2021-02-09. OptSmart: A Space Efficient Optimistic Concurrent Execution of Smart Contracts. https://arxiv.org/abs/2102.04875

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