OptSmart: a space efficient Optimistic concurrent execution of Smart contracts

Popular blockchains such as Ethereum and several others execute complex transactions in the block through user-defined scripts known smart contracts. Serial execution of contract transactions/atomic units (AUs) fails to harness multiprocessing power offered by prevalence multi-core processors. By adding concurrency AUs, we can achieve better efficiency higher throughput. In this paper, develop a concurrent miner that proposes executing AUs concurrently using optimistic Software Transactional Memory systems (STMs). It efficiently captures independent bin dependent graph (BG). Later, propose validator re-executes same deterministically followed BG given verify block. We rigorously prove correctness AUs. The performance benchmark shows average speedup for optimized is $$5.21 \times$$ , while maximum $$14.96 over serial miner. obtains an $$8.61 $$14.65 validator. proposed outperforms $$1.02 $$1.18\times$$ $$1 $$4.46 state-of-the-art miners validators, respectively. Moreover, efficient saves $$2.29 more space when compared with state-of-the-art.