While showing great promise, Bitcoin requires users to wait tens of minutes for transactions to commit – even then offering only probabilistic guarantees. This paper introduces ByzCoin, a novel Byzantine consensus protocol that leverages scalable collective signing to commit Bitcoin transactions irreversibly within seconds. ByzCoin achieves Byzantine consensus while preserving Bitcoin’s open me...

The Transactional memory Coherence and Consistency (TCC) provides a shared memory model in which atomic transactions are always the basic unit of parallel work, communication, memory coherence, and memory reference consistency. TCC greatly simplifies parallel software by eliminating the need for synchronization using conventional locks and semaphores, along with their complexities. TCC hardware...

Cryptocurrencies like Bitcoin and Ethereum, are widely known applications of blockchain technology, have drawn much attention largely recognized in recent years. Initially Ethereum processed 7 15 Transactions Per Second (TPS) respectively, whereas VISA Paypal process 1700 193 TPS respectively. The biggest challenge to adoption is scalability, defined as the capacity change block size handle gro...

We present here a transaction model for managing replicated data with different consistency guarantees to make suitable trade-offs between data availability, scalability, and consistency for different data items. Data is organized in a hierarchy which is based on consistency levels and the associated transaction management protocols. The model presented here is based on imposing certain constra...

Catching the recent trend of data is an important issue when mining frequent itemsets from data streams. To prevent from storing the whole transaction data within the sliding window, the frequency changing point (FCP) method was proposed for monitoring the recent occurrences of itemsets in a data stream under the assumption that exact one transaction arrives at each time point. In this paper, t...

Abstract Blockchain technology has the characteristics of decentralization and tamper resistance, which can store data safely reduce cost trust effectively. However, existing blockchain system weak performance in management, only supports traversal queries with transaction hashes as keywords. The query method based on account trace chain (ATTC) improves efficiency historical transactions accoun...

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 bl...