Blockchain, as the backbone technology of the current popular Bitcoin digital currency, has become a promising decentralized approach for resource and transaction management. Although blockchain has been widely adopted in many applications, e.g., finance, healthcare, and logistics, its application in mobile environments is still limited. This is due to the fact that blockchain users need to sol...

Blockchain is a distributed, transactional database that is shared across all the nodes participating in the network. This is the main technical innovation of Bitcoin and it acts as a public ledger for the transactions. Every node in the system has a full copy of the current chain, which contains every transaction ever executed. Every block contains a hash of the previous block, linking these t...

In this paper we address the issue of retaining user anonymity within a permissioned blockchain. We present the ChainAnchor architecture that adds an identity and privacy-preserving layer above the blockchain, either the private blockchain or the public Blockchain in Bitcoin. ChainAnchor adds an anonymous identity verification step such that anyone can read and verify transactions from the bloc...

This presentation explores the current state of Blockchain research as it relates to Linked Data. The topics covered by the presentation include: 1) a basic definition of a blockchain, 2) an analysis of current blockchain capabilities, 3) compelling blockchain use cases where Linked Data would provide compelling benefits, 4) how Linked Data may be used to enhance blockchain capabilities, 5) a l...

This paper presents TumbleBit, a new anonymous payments scheme that is fully compatible with today’s Bitcoin protocol. TumbleBit allows parties to make payments through an untrusted Tumbler. No-one, not even the Tumbler, can tell which payer paid which payee during a TumbleBit epoch. TumbleBit consists of two interleaved fair-exchange protocols that prevent theft of bitcoins by cheating users o...

Blockchain is a distributed, transactional database that is shared across all the nodes participating in the network. This is the main technical innovation of Bitcoin and it acts as a public ledger for the transactions. However, this technology lacks standardisation and uniform understanding. This is due to a few studies, that would provide a comprehensive model of the blockchain and the distri...

Blockchain is a distributed database that keeps a chronologicallygrowing list (chain) of records (blocks) secure from tampering and revision. While computerisation has changed the nature of a ledger from clay tables in the old days to digital records in modern days, blockchain technology is the first true innovation in record keeping that could potentially revolutionise the basic principles of ...

A blockchain is a linked-list of immutable tamper-proof blocks, which is stored at each participating node. Each block records a set of transactions and the associated metadata. Blockchain transactions act on the identical ledger data stored at each node. Blockchain was first perceived by Satoshi Nakamoto (Satoshi 2008), as a peer-to-peer money exchange system. Nakamoto referred to the transact...

Different versions of peer-to-peer electronic cash exist as data represented by separate blockchains. Payments between such systems cannot be sent directly from one party to another without going through a financial institution. Bitcoin provided part of the solution but its utility is limited to intra-blockchain transactions. The benefits are lost if a trusted third party is required to execute...

1 Background The world has seen a large amount of investments and developments going into the blockchain technology in recent years. In essence, a blockchain can be viewed as a distributed append-only log, the integrity of which is backed by the consensus of a network of nodes. Many properties of blockchain are considered to be desirable for the operation and collaboration of a variety of diffe...