An active research trend is to exploit the consensus mechanism of cryptocurrencies to secure the execution of distributed applications. In particular, some recent works have proposed fair lotteries which work on Bitcoin. These protocols, however, require a deposit from each player which grows quadratically with the number of players. We propose a fair lottery on Bitcoin which only requires a co...

A snapshot records all public addresses in the Bitcoin network with a substantial balance (over about 20 cents in USD) and sorts them from highest to lowest balance. This eliminates millions of addresses from places like Satoshi Dice that have small amounts of bitcoin in them, called ‘dust’. We then save these addresses, along with their balances, and an alternative representation of the addres...

Given live streaming Bitcoin activity, we aim to forecast future Bitcoin prices so as to execute profitable trades. We show that Bitcoin price data exhibit desirable properties such as stationarity and mixing. Even so, some classical time series prediction methods that exploit this behavior, such as ARIMA models, produce poor predictions and also lack a probabilistic interpretation. In light of...

The Bitcoin scheme is one of the most popular and talked about alternative payment schemes. One of the most active parts of the Bitcoin ecosystem was the Silk Road marketplace, in which highly illegal substances and services were traded. It was run by a person who called himself Dread Pirate Roberts (DPR), whose bitcoin holdings are estimated to be worth hundreds of millions of dollars at today...

................................................................................................................................................. 2 Why digital cash? .................................................................................................................................... 2 Fiat Currency .....................................................................................

Este trabalho tem a proposta de apresentar, forma conceitual, os novos mecanismos monetários em formato moedas eletrônicas, como as chamadas criptomoedas, bem analisar natureza jurídica do Bitcoin e seus efeitos no ordenamento jurídico brasileiro, verificando o direito brasileiro classifica instituto priori. O método pesquisa foi essencialmente bibliográfico, analisando-se artigos científicos, ...

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One of the central challenges for mathematical cryptography is to create a payment system that provides the advantages of cash in a digital world. In this expository article we describe two very different solutions to this problem. The first is an elliptic-curve-based version of a construction of S. Brands, and the second is Bitcoin. We also discuss a generalization of Bitcoin that supports pee...

A ransomware is a type of malware through which an attacker extorts the user of a computer system, so that he can make a payment that is generally operated in the Bitcoin system. This study aims to measure the payment flows corresponding to ransomware WannaCry, in order to provide information about methods used by cybercriminals to move and hide the trace of the financial resources on Bitcoin B...

Bitcoin has emerged as the most successful cryptographic currency in history. Within two years of its quiet launch in 2009, Bitcoin grew to comprise billions of dollars of economic value, even while the body of published research and security analysis justifying the system’s design was negligible. In the ensuing years, a growing literature has identified hidden-butimportant properties of the sy...