A blockchain powered health information exchange (HIE) can unlock the true value of interoperability and cyber security. This system has the potential to eliminate the friction and costs of current third party intermediaries, when considering population health management. There are promises of improved data integrity, reduced transaction costs, decentralization and disintermediation of trust. B...

Access Control systems are used in computer security to regulate the access to critical or valuable resources. The rights of subjects to access such resources are typically expressed through access control policies, which are evaluated at access request time against the current access context. This paper proposes a new approach based on blockchain technology to publish the policies expressing t...

A blockchain powered health information exchange could unlock the true value of interoperability. Blockchain-based systems have the potential to reduce or eliminate the friction and costs of current intermediaries. Particularly compelling use cases for blockchain technology include the Precision Medicine Initiative, Patient Care and Outcomes Research (PCOR), and the Nationwide Interoperability ...

A comparative study across the most widely known blockchain technologies is conducted with a bottom-up approach. Blockchains are disentangled into building blocks. Each building block is then hierarchically classified in main and subcomponents. Then, alternative values (i.e., layouts) for the subcomponents are identified and compared between them. Finally, an ontology matrix summarises the stud...

Blockchain technologies is one of the most popular issue in recent years, it has already changed people’s lifestyle in some area due to its great influence on many business or industry, and what it can do will still continue cause impact in many places. Although the feature of blockchain technologies may bring us more reliable and convenient services, the security issues and challenges behind t...

Since its 2008 appearance as a cornerstone of the cryptocurrency bitcoin, the blockchain technology gained widespread attention as a modality to securily validate and store information without a trusted third party. Indeed trust is replaced by cryptographic security, epitomised by hash functions, a unique fingerprint of any information file. The paper is a quick overview of the main concepts an...

Blockchain, an emerging decentralized security system, has been applied in many applications, such as bitcoin, smart grid, and Internet-of-Things. However, running the mining process may cost too much energy consumption and computing resource usage on handheld devices, which restricts the use of blockchain in mobile environments. In this paper, we consider deploying edge computing service to su...

Blockchains like Bitcoin and Namecoin and their respective P2P networks have seen significant adoption in the past few years and show promise as naming systems with no trusted parties. Users can register human meaningful names and securely associate data with them, and only the owner of the particular private keys that registered them can write or update the name-value pair. In theory, many dec...

1. A blockchain-based support for social networking. The recent increase in reported incidents of privacy and security breaches in social networks are mainly due the centralized nature of these neworks, which enables third-parties to collect and control massive amounts of personal data. This thesis regards the definition of a framework for the support of social networks exploiting a distributed...

Cryptocurrencies, based on and led by Bitcoin, have shown promise as infrastructure for pseudonymous online payments, cheap remittance, trustless digital asset exchange, and smart contracts. However, Bitcoin-derived blockchain protocols have inherent scalability limits that trade-off between throughput and latency and withhold the realization of this potential. This paper presents Bitcoin-NG, a...