Efficient Concurrent Execution of Smart Contracts in Blockchains Using Object-Based Transactional Memory

This paper proposes an efficient framework to execute Smart Contract Transactions (SCTs) concurrently based on object semantics, using optimistic Single-Version Object-based Software Transactional Memory Systems (SVOSTMs) and Multi-Version OSTMs (MVOSTMs). In our framework, a multi-threaded miner constructs Block Graph (BG), capturing the object-conflicts relations between SCTs, stores it in block. Later, validators re-execute same SCTs deterministically relying this BG. A malicious can modify BG harm blockchain, e.g., cause double-spending. To identify miners, we propose Multi-threaded Validator (SMV). Experimental analysis shows that proposed validator achieve significant performance gains over state-of-the-art SCT execution framework.