نتایج جستجو برای: blockchain
تعداد نتایج: 8915 فیلتر نتایج به سال:
Fabric is amodular and extensible open-source system for deploying and operating permissioned blockchains and one of theHyperledger projects hosted by the Linux Foundation (www.hyperledger.org). Fabric is the first truly extensible blockchain system for running distributed applications. It supports modular consensus protocols, which allows the system to be tailored to particular use cases and t...
Consensus is a fundamental problem of distributed computing. While this problem has been known to be unsolvable since 1985, existing protocols were designed these past three decades to solve consensus under various assumptions. Today, with the recent advent of blockchains, new consensus implementations were proposed to make replicas reach an agreement on the order of transactions updating what ...
The Bitcoin backbone protocol [Eurocrypt 2015] extracts basic properties of Bitcoin's underlying blockchain data structure, such as common pre x and chain quality, and shows how fundamental applications including consensus and a robust public transaction ledger can be built on top of them. The underlying assumptions are proofs of work (POWs), adversarial hashing power strictly less than 1/2 and...
An internet user wanting to share observed content is typically restricted to primitive techniques such as screenshots, web caches or share button-like solutions. These acclaimed proofs, however, are either trivial to falsify or require trust in centralized entities (e.g., search engine caches). This motivates the need for a seamless and standardized internet-wide non-repudiation mechanism, all...
This is an exploration of Blockchain technology that is growing in popularity and it seems to be able to disrupt a plethora of industries. A research is being conducted to examine Blockchain’s potential to be adopted by enterprises from different sectors as well as the parameters that could affect its adoption. Mostly known as the technology that underpins Bitcoin, this concept raised a signifi...
While swarm robotics systems are often claimed to be highly fault-tolerant, so far research has limited its attention to safe laboratory settings and has virtually ignored security issues in the presence of Byzantine robots—i.e., robots with arbitrarily faulty or malicious behavior. However, in many applications one or a few Byzantine robots might suffice to let current swarm coordination mecha...
Blockchain has recently been applied in many applications such as bitcoin, smart grid, and Internet of Things (IoT) as a public ledger of transactions. However, the use of blockchain in mobile environments is still limited because the mining process consumes too much computing and energy resources on mobile devices. Edge computing offered by the Edge Computing Service Provider can be adopted as...
In this paper, we explore an idea of making (proof-of-work) blockchains mutable. We propose and implement μchain, a mutable blockchain, that enables modifications of blockchain history. Blockchains are, by common definition, distributed and immutable data structures that store a history of events, such as transactions in a digital currency system. While the very idea of mutable event history ma...
As the core issue of blockchain, the mining requires solving a proof-of-work puzzle, which is resource expensive to implement in mobile devices due to high computing power needed. Thus, the development of blockchain in mobile applications is restricted. In this paper, we consider the edge computing as the network enabler for mobile blockchain. In particular, we study optimal pricing-based edge ...
In this paper, we present a new definition of Byzantine consensus that applies to blockchains, applications that allow to transfer digital assets through transactions. More precisely, a blockchain is a distributed abstraction where participants must reach a consensus on a unique block of transactions to be appended to the chain. This new consensus definition requires a validity property based o...
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