In recent years, ideas about crypto currencies with interesting and new for today monetary principles becoming more and more popular. The crypto currencies' met different attitude to it new for the world finances principals. There are different talks. Ones think that it may improve monetary system, others think that it is a toy money that may cause instability and crash the world finance. However, the fact is that innovative concept of e-currency still developing and becoming more popular and in this way crypto currencies, particularly the most popular one-bitcoin is more useful and more preferable way of transaction in Internet. For today its audience accumulated a 9 billion USD on exchange stocks specially designed for crypto currency. The paper is about the new currency and about its innovative principles that can be used in current financial situation.
We live in an era where Internet is one of the daily needs of human life. People use Internet banking instead of going to banks, they use email rather than postal mail.This leads to a robust digital way of living, but this also means people are trusting middle companies and third parties for their online services. The need of having a digital form of money that is not being controlled by one entity is plain to see. \nBitcoin is the first and the most popular decentralized virtual currency. It is based on cryptographic functions to remove the need of a central bank and regulates the generation of new units. \nIn this thesis, we would like to look at available tools to facilitate users in holding and using Bitcoin by a perspective on usability and security, and then evaluate the possibilities for a small business to accept Bitcoin payments. Our focus is on the usability of these tools and developing a useful framework for comparing and eval- uating future tools. While many security tools have been studied from a usability perspective, our work is the first to look at Bitcoin.
This paper sets out to explore the hedging capabilities of bitcoin by applying the asymmetric GARCH methodology used in investigation of gold. The results show that bitcoin can clearly be used as a hedge against stocks in the Financial Times Stock Exchange Index. Additionally bitcoin can be used as a hedge against the American dollar in the short-term. Bitcoin thereby possess some of the same hedging abilities as gold and can be included in the variety of tools available to market analysts to hedge market specific risk.
It doesn't matter whether its coin, banknotes or even gold the usual currency in circulation in our communities. But have we ever thought of using virtual currency in the real world, with a higher value to that of gold. Bitcoin have caused waves across the globe, it is believed to be the most valuable currency in the future. This article describes the sensation caused by the global virtual currency Bitcoin, the rise resulting in principle and practical instruction on how to get Bitcoin currently in use.
Bitcoin gains more and more attention in the general public and is already the most popular virtual currency. At the same time, the acceptance of Bitcoin as a speculative asset and also as a payment vehicle increases. This is an indication that we might now be entering an era of parallel currency systems. Therefore, one could state that the Bitcoin network and the central banking system could become two rival systems with respect to issuing payment vehicles and providing cross-border payment systems. Our aim is to analyse the central bank incentives for establishing a network model that includes hacking. With our model we are able to explain why central banks have no incentive to advance Bitcoin regulation at the current stage of development, as this would reduce the critical mass of Bitcoin users. Finally, in combination with a central bank loss function, we are able to calculate an optimal level of central regulation.
Ayush Dubey, Greg D. Hill, Robert Escriva, Emin GĂŒn Sirer
Graph databases have become an increasingly common infrastructure component. Yet existing systems either operate on offline snapshots, provide weak consistency guarantees, or use expensive concurrency control techniques that limit performance. In this paper, we introduce a new distributed graph database, called Weaver, which enables efficient, transactional graph analyses as well as strictly serializable ACID transactions on dynamic graphs. The key insight that allows Weaver to combine strict serializability with horizontal scalability and high performance is a novel request ordering mechanism called refinable timestamps. This technique couples coarse-grained vector timestamps with a fine-grained timeline oracle to pay the overhead of strong consistency only when needed. Experiments show that Weaver enables a Bitcoin blockchain explorer that is 8x faster than Blockchain.info, and achieves 12x higher throughput than the Titan graph database on social network workloads and 4x lower latency than GraphLab on offline graph traversal workloads.
Recent years have witnessed the emergence of digital currencies - digital representations of value which are transferred using IT technologies and used as a medium of exchange but are not recognised as official means of payment. Bitcoins are one of such currencies and their popularity in Europe and in Poland has been growing. Hence it is a good time to consider to what extent Polish law is prepared to face the phenomenon and what potential problems may arise from it for the judicial system. The main objective of the paper is to analyse Polish tax regulations in the context of bitcoin transactions, as broadly understood.
The Technology Acceptance Model (TAM) is an important analysis tool in the study of the social mechanisms of technology adoption, and has received considerable attention and study in the literature. Though empirical support for the model has varied depending on situation specifics, it remains a popular and useful conceptual framework for analysis of factors contributing to technology acceptance or rejection by the relevant constituencies. In this paper we use the TAM framework to analyze aspects of the technology acceptance process in the case of Bitcoin. Bitcoin is an entirely digital distributed currency whose disruptive and disintermediating nature has fueled the tremendous growth of the financial technology space over the past few years. Bitcoin's distributed, verifiable, and immutable public transaction ledger, the blockchain, holds out the promise of fast, cheap, peer-to-peer financial transactions, as well as significant efficiencies in the transfer of other assets via overlay networks. In this study, we break down, describe, and analyze the various factors affecting the past and future adoption curve for Bitcoin in the context of the Technology Acceptance Model.
The anonymity of the Bitcoin system has some shortcomings. Analysis of Transaction Chain (ATC) and Analysis of Bitcoin Protocol and Network (ABPN) are two important methods of deanonymizing bitcoin transactions. Nowadays, there are some anonymization methods to combat ATC but there has been little research into ways to counter ABPN. This paper proposes a new anonymization technology called Transaction Remote Release (TRR). Inspired by The Onion Router (TOR), TRR is able to render several typical attacking methods of ABPN ineffective. Furthermore, the performance of encryption and decryption of TRR is good and the growth rate of the cipher is very limited. Hence, TRR is suited for practical applications.
Open access
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cs.CR
Blockchain Technology Applications and Security
Advanced Steganography and Watermarking Techniques
The aim of the article was to evaluate the risks of investing in Bitcoin cryptocurrency. Particular attention was paid to the risk of investment on the Polish exchanges: Bitcurex, BitBay, BitMarket.pl and LocalBitcoins. To evaluate the risk there was used VaR measure. There were compared the risk of investing in Bitcoin cryptocurrency and the risk of investing in the selected "traditional" currencies. There was also paid attention to the effect of day of the week on the Bitcoinâs exchanges. The investment in cryptocurrency was characterized by higher risk than investing in âtraditionalâ currencies. The Polish Bitcoin exchange LocalBitcoins was characterized by the highest risk and highest average daily rate of return.
Bitcoin is the first technology for the final transfer of digital goods online, facilitating instant global payments without intermediation. Bitcoinâs operation is based on a distributed, decentralized, and transparent asset ledger that acts as an ongoing chain record of all transactions. The system issues coins to reward those who contribute processing power to the networkâs operation. The possibilities created by this innovation are significant for the worldâs poor, who could skip traditional political and financial institutions and move to digital currencies in the same way they have gone straight to using mobile phones and skipped landline telephones.
Peggy Valcke, Niels Vandezande, Nathan Van de Velde
The research looked at which third party payment providers (TPPâs) are covered by the PSD2 and AMLD4 directives, the consequences thereof, as well as to what extent such coverage goes; and sought to analyse the potential for the regulation of cryptocurrency in terms of combatting money laundering and terrorist financing. TPPâs gain possession of a significant amount of sensitive information, for instance by providing a gateway from which consumers log in to their bank accounts using their unique identifiers and credentials. As a result, these entities are drawing increasingly more attention from legislators and regulators.Under the framework of the PSD2, TPPâs will be subject to stringent regulatory standards similar to those placed on traditional payment service providers under the PSD. In the US, regulation of TPPâs must be assessed on a state-by-state basis. In Florida, for instance, they can be considered as money transmitters, thus putting them under that regulation, as well as the federal Bank Secrecy Act. In Asia, the number of TPPâs has grown significantly over the past years. In China, these actors are regulated by the Peopleâs Bank of China, and are subjected to a number of requirements similar to those found in the EU, such as minimum capital requirements and anti-money laundering rules.Another notable development is that of alternative payment methods â a prime example here are cryptocurrencies such as bitcoin. The bitcoin ecosystem is decentralized, meaning that no single entity controls the system. Currently, there exists no convincing arguments to consider virtual currencies as regulated under the EUâs Payment Services Directive or the Second E-money Directive. While the PSD2 does introduce new terminology and significantly amended scope exemptions compared to the original Payment Services Directive, there is no wider inclusion of virtual currencies under its scope. A similar argument can be made for the recently adopted AMLD4, where virtual currencies have been omitted from its scope despite earlier signs that this development may be included. The researchers conclude their paper with several public and private sector recommendations.
The rhetoric in Satoshi Nakamoto's "White Paper" on the origins of Bitcoin suggests that the digital currency was envisioned as an entirely autonomous money. Due to the increase in popularity and circulation of Bitcoin and other digital currencies, an intense regulatory debate has been sparked at the global level. These debates reveal a fundamental tension regarding the role of the state in establishing money. While the digital currency community insists that Bitcoin is money, states and monetary authorities have declared Bitcoin a commodity, a declaration that can be traced back to Georg Friedrich Knapp's foundational text The State Theory of Money and reinforced by A. Mitchell Innes' The Credit Theory of Money. Circulating alongside state monies, Bitcoin is then neaccessory money,' unable to satisfy tax obligations and behaving as a commodity. This chartalist account of Bitcoin is refuted by what I identify as a libertarian/von Misean understanding of money motivating the circulation of digital currencies. I argue that the circulation of digital currencies is better explained by the chartalist narrative. I then prescribe Georg Simmel's Philosophy of Money, a broader understanding of money in which more abstract monies might create a supranational economic society, as an ideological alternative to digital currency advocates -- one that better conforms to the nature of money gestured to in Nakamoto's "White Paper". However, even through the lens of Simmel, the limitations imposed by domestic authorities and taxation prevent digital currencies from reaching the envisioned state of autonomy. Synthesizing these understandings of money, Bitcoin may exist as a compromise, a means of international money transfer that weakens the abstract, international economic borders created by state monies.
Pavel Ciaian, Miroslava RajÄĂĄniovĂĄ, dâArtis Kancs
Abstract This paper identifies and analyzes BitCoin features which may facilitate BitCoin to become a global currency, as well as characteristics which may impede the use of BitCoin as a medium of exchange, a unit of account and a store of value, and compares BitCoin with standard currencies with respect to the main functions of money. Among all analyzed BitCoin features, the extreme price volatility stands out most clearly compared to standard currencies. In order to understand the reasons for such extreme price volatility, we attempt to identify drivers of BitCoin price formation and estimate their importance econometrically. We apply time-series analytical mechanisms to daily data for the 2009â2014 period. Our estimation results suggest that BitCoin attractiveness indicators are the strongest drivers of BitCoin price followed by market forces. In contrast, macro-financial developments do not determine BitCoin price in the long-run. Our findings suggest that as long as BitCoin price will be mainly driven by speculative investments, BitCoin will not be able to compete with standard currencies.
This paper explores the financial asset capabilities of bitcoin using GARCH models. The initial model showed several similarities to gold and the dollar indicating hedging capabilities and advantages as a medium of exchange. The asymmetric GARCH showed that bitcoin may be useful in risk management and ideal for risk averse investors in anticipation of negative shocks to the market. Overall bitcoin has a place on the financial markets and in portfolio management as it can be classified as something in between gold and the American dollar on a scale from pure medium of exchange advantages to pure store of value advantages.
This article is aimed at augmenting current awareness of virtual currencies ("VCs") in the South African legal community. To this end, it introduces the reader to VCs in general and decentralised convertible VCs ("DCVCs") in particular. Due to their design and interaction with the real economy and currency, DCVCs are on the radar of many financial regulators worldwide. As Bitcoin is considered the leading type of DCVC in terms of value and volume, its early beginnings in South Africa are probed. Although regulation should follow innovation, awareness of the VC ecosystem will not only warrant appropriate regulatory intervention when the time comes, but will also enable the growth and development opportunities associated with VCs. South Africa has not promulgated any legislation pertaining to VCs. The potential applicability of all current legislation and regulations relevant to VCs calls for in-depth research. This article aspires to serve as an appetiser to do so.
This Request For Comment (RFC) is a proposal for a new protocol to use money over the Internet. Features like a distributed architecture, a published cryptographic algorithm, a minimal authority responsibility, the absence of fees will make this protocol a perfect tool for citizens in today's digital World. An implementation has validated the main principles and we entering now a testing phase (v0.1). Depending of the results, a released date for the 1.0 revision will to decided to allow anybody to send or to receive money to/from anyone, in any currency, with a regular and personal smart-phone. A distributed hash table (DHT) is used to store all transactions, public keys and certificates redundantly on several nodes. The all system may replace coins, banknotes and classical checks in the future. We also argue that the Bitcoin technology does not satisfy the requirements for a digital mean of payment. This proposal is expected to be reviewed and commented by the Internet Engineering Task Force.
Petra Kralj Novak, Miha Grcar, Borut Sluban, Igor Mozetic
Unstructured data, such as news and blogs, can provide valuable insights into the financial world. We present the NewsStream portal, an intuitive and easy-to-use tool for news analytics, which supports interactive querying and visualizations of the documents at different levels of detail. It relies on a scalable architecture for real-time processing of a continuous stream of textual data, which incorporates data acquisition, cleaning, natural-language preprocessing and semantic annotation components. It has been running for over two years and collected over 18 million news articles and blog posts. The NewsStream portal can be used to answer the questions when, how often, in what context, and with what sentiment was a financial entity or term mentioned in a continuous stream of news and blogs, and therefore providing a complement to news aggregators. We illustrate some features of our system in three use cases: relations between the rating agencies and the PIIGS countries, reflection of financial news on credit default swap (CDS) prices, the emergence of the Bitcoin digital currency, and visualizing how the world is connected through news.
Bitcoin, the first electronic payment system, is becoming a popular currency. We provide a statistical analysis of the log-returns of the exchange rate of Bitcoin versus the United States Dollar. Fifteen of the most popular parametric distributions in finance are fitted to the log-returns. The generalized hyperbolic distribution is shown to give the best fit. Predictions are given for future values of the exchange rate.
Bitcoin is a decentralized crypto-currency, and an accompanying protocol, created in 2008. Bitcoin nodes continuously generate and propagate blocks---collections of newly approved transactions that are added to Bitcoin's ledger. Block creation requires nodes to invest computational resources, but also carries a reward in the form of bitcoins that are paid to the creator. While the protocol requires nodes to quickly distribute newly created blocks, strong nodes can in fact gain higher payoffs by withholding blocks they create and selectively postponing their publication. The existence of such selfish mining attacks was first reported by Eyal and Sirer, who have demonstrated a specific deviation from the standard protocol (a strategy that we name SM1). In this paper we extend the underlying model for selfish mining attacks, and provide an algorithm to find $Δ$-optimal policies for attackers within the model, as well as tight upper bounds on the revenue of optimal policies. As a consequence, we are able to provide lower bounds on the computational power an attacker needs in order to benefit from selfish mining. We find that the profit threshold -- the minimal fraction of resources required for a profitable attack -- is strictly lower than the one induced by the SM1 scheme. Indeed, the policies given by our algorithm dominate SM1, by better regulating attack-withdrawals. Using our algorithm, we show that Eyal and Sirer's suggested countermeasure to selfish mining is slightly less effective than previously conjectured. Next, we gain insight into selfish mining in the presence of communication delays, and show that, under a model that accounts for delays, the profit threshold vanishes, and even small attackers have incentive to occasionally deviate from the protocol. We conclude with observations regarding the combined power of selfish mining and double spending attacks.
This paper proposes the first hash opinion dynamics model, named SkyHash, that can help a P2P network quickly reach consensus on hash opinion. The model consists of a bit layer and a hash layer, each time when a node shapes its new opinion, the bit layer is to determine each bit of a pseudo hash, and the hash layer is to choose a hash opinion with minimum Hamming distance to the pseudo hash. With simulations, we conducted a comprehensive study on the convergence speed of the model by taking into account impacts of various configurations such as network size, node degree, hash size, and initial hash density. Evaluation demonstrates that using our model, consensus can be quickly reached even in large networks. We also developed a denial-of-service (DoS) proof extension for our model. Experiments on the SNAP dataset of the Wikipedia who-votes-on-whom network demonstrate that besides the ability to refuse known ill-behaved nodes, the DoS-proof extended model also outperforms Bitcoin by producing consensus in 45 seconds, and tolerating DoS attack committed by up to 0.9% top influential nodes.
Virtual currencies have been well-cited and well-discussed in the near past. Due to the loss of trust in the banking sector and the fear of loss of capital, low interest rates and uncertainty of existing currencies, the ground for a virtual currency was given. Virtual currencies and the money flows are controlled only online by the anonymous group of volunteers (also called peer); every single transaction is documented. Approximately 10,000 businesses worldwide accept payments with virtual currencies already, and the number is increasing steadily. This article analyzes the advantages and disadvantages of virtual currencies in comparison to real money and gives an outlook to a new banking system with high transparency and the chance to lead to a paradigm shift in the world of transactions and banking.