Bitcoin and the Politics of Distributed Trust
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Asymmetric Proof-Of-Work Based on the Generalized Birthday Problem
Equihash: Asymmetric Proof-of-Work Based on the Generalized Birthday Problem Alex Biryukov Dmitry Khovratovich University of Luxembourg University of Luxembourg [email protected] [email protected] Abstract—The proof-of-work is a central concept in modern Long before the rise of Bitcoin it was realized [20] that cryptocurrencies and denial-of-service protection tools, but the the dedicated hardware can produce a proof-of-work much requirement for fast verification so far made it an easy prey for faster and cheaper than a regular desktop or laptop. Thus the GPU-, ASIC-, and botnet-equipped users. The attempts to rely on users equipped with such hardware have an advantage over memory-intensive computations in order to remedy the disparity others, which eventually led the Bitcoin mining to concentrate between architectures have resulted in slow or broken schemes. in a few hardware farms of enormous size and high electricity In this paper we solve this open problem and show how to consumption. An advantage of the same order of magnitude construct an asymmetric proof-of-work (PoW) based on a compu- is given to “owners” of large botnets, which nowadays often tationally hard problem, which requires a lot of memory to gen- accommodate hundreds of thousands of machines. For prac- erate a proof (called ”memory-hardness” feature) but is instant tical DoS protection, this means that the early TLS puzzle to verify. Our primary proposal Equihash is a PoW based on the schemes [8], [17] are no longer effective against the most generalized birthday problem and enhanced Wagner’s algorithm powerful adversaries. -
A Probe Survey of Bitcoin Transactions Through Analysis of Advertising in an On-Line Discussion Forum
Acta Informatica Pragensia, 2019, 8(2), 112–131 DOI: 10.18267/j.aip.127 Original Article A Probe Survey of Bitcoin Transactions Through Analysis of Advertising in an On-Line Discussion Forum Zoltan Ban 1, Jan Lansky 1, Stanislava Mildeova 1, Petr Tesar 1 Abstract Cryptocurrencies have become a major phenomenon in recent years. For IT, a breakthrough is both the cryptocurrency itself as a commodity and the technology that cryptocurrency development has brought. The article focuses on the bitcoin cryptocurrency as the most important cryptocurrency. A relatively unexplored topic is what goods or services are purchased for bitcoins. To track what bitcoins are spent on, it is necessary to look for places that are dedicated to trading cryptocurrencies. The bitcointalk.org forum was chosen as a source for our data mining. The aim of the article is to find an answer to the research question: What are bitcoins on the discussion forum bitcointalk.org planned to be spent on? As part of the research, an application was developed using a PHP script to gather information from the discussion forum (bitcointalk.org). There is some evidence which suggests what types of products or services people spend cryptocurrencies on. This research has proven that cryptocurrencies are used to buy and sell goods or services in the electronics and computer world segments. Today, these segments are widespread, which may speed up the integration of cryptocurrencies into everyday life. This applies, of course, only if the risks associated with cryptocurrencies do not increase. Keywords: Cryptocurrency, Bitcoin, On-Line Advertisement, Text Mining, Cybersecurity, Discussion Forum. -
Download Criminal Complaint Filed in the Eastern District of California
AO 91 (Rev. 11/11) Criminal Complaint UNITED STATES DISTRICT COURT for the Eastern District of California United States of America ) V. ) MARCOS PAULO DE OLIVEIRA ) Case No. ANNIBALE, ) aka "Med3lin," ) aka "Med3lln," ) aka "Med3lln WSM" ) Defendant(s) CRIMINAL COMPLAINT I, the complainant in this case, state that the following is true to the best of my knowledge and belief. On or about the date( s) of October 2017 through April 2019__ in the county of Sacramento in the Eastern District of California , and elsewhere, the defendant(s) violated: Code Section Offense Description 21 U.S.C. §§ 841 and 846 Distribution and Conspiracy to Distribute Controlled Substances 18 U.S.C. §§ 1956 and 1957 Money Laundering This criminal complaint is based on these facts: (see attachment) IX! Continued on the attached sheet. -j- ;1 ·) / , / l 1 - • / L ',;;;_ . _/__I-- / Complainant's signature JAY D. DIAL, Jr., Special Agent Dl'llg Enforcem~_11t Ad111inistration Printed name and title Sworn to before me and signed in my presence. ;]t "-" ' Date: l.2 _/,_ I ---=- (.___ ,,--- "'-~ Judge 's signature City and state: Sacramento, CA Allls__on Claire, U_.§~ Magi~trate__.J__udge Printed name and title AO 91 (Rev. 11/11) Criminal Complaint UNITED STATES DISTRICT COURT for the Eastern District of California United States of America ) V. ) MARCOS PAULO DE OLIVEIRA ) Case No. ANNIBALE, ) aka "Med3lin," ) aka "Med3l1n," ) aka "Med3lln_WSM" ) Defendant(s) CRIMINAL COMPLAINT I, the complainant in this case, state that the following is true to the best of my knowledge and belief. On or about the date(s) of ~tober 20 I 7 through April 2019_ in the county of . -
Transparent and Collaborative Proof-Of-Work Consensus
StrongChain: Transparent and Collaborative Proof-of-Work Consensus Pawel Szalachowski, Daniël Reijsbergen, and Ivan Homoliak, Singapore University of Technology and Design (SUTD); Siwei Sun, Institute of Information Engineering and DCS Center, Chinese Academy of Sciences https://www.usenix.org/conference/usenixsecurity19/presentation/szalachowski This paper is included in the Proceedings of the 28th USENIX Security Symposium. August 14–16, 2019 • Santa Clara, CA, USA 978-1-939133-06-9 Open access to the Proceedings of the 28th USENIX Security Symposium is sponsored by USENIX. StrongChain: Transparent and Collaborative Proof-of-Work Consensus Pawel Szalachowski1 Daniel¨ Reijsbergen1 Ivan Homoliak1 Siwei Sun2;∗ 1Singapore University of Technology and Design (SUTD) 2Institute of Information Engineering and DCS Center, Chinese Academy of Sciences Abstract a cryptographically-protected append-only list [2] is intro- duced. This list consists of transactions grouped into blocks Bitcoin is the most successful cryptocurrency so far. This and is usually referred to as a blockchain. Every active pro- is mainly due to its novel consensus algorithm, which is tocol participant (called a miner) collects transactions sent based on proof-of-work combined with a cryptographically- by users and tries to solve a computationally-hard puzzle in protected data structure and a rewarding scheme that incen- order to be able to write to the blockchain (the process of tivizes nodes to participate. However, despite its unprece- solving the puzzle is called mining). When a valid solution dented success Bitcoin suffers from many inefficiencies. For is found, it is disseminated along with the transactions that instance, Bitcoin’s consensus mechanism has been proved to the miner wishes to append. -
3Rd Global Cryptoasset Benchmarking Study
3RD GLOBAL CRYPTOASSET BENCHMARKING STUDY Apolline Blandin, Dr. Gina Pieters, Yue Wu, Thomas Eisermann, Anton Dek, Sean Taylor, Damaris Njoki September 2020 supported by Disclaimer: Data for this report has been gathered primarily from online surveys. While every reasonable effort has been made to verify the accuracy of the data collected, the research team cannot exclude potential errors and omissions. This report should not be considered to provide legal or investment advice. Opinions expressed in this report reflect those of the authors and not necessarily those of their respective institutions. TABLE OF CONTENTS FOREWORDS ..................................................................................................................................................4 RESEARCH TEAM ..........................................................................................................................................6 ACKNOWLEDGEMENTS ............................................................................................................................7 EXECUTIVE SUMMARY ........................................................................................................................... 11 METHODOLOGY ........................................................................................................................................ 14 SECTION 1: INDUSTRY GROWTH INDICATORS .........................................................................17 Employment figures ..............................................................................................................................................................................................................17 -
EY Study: Initial Coin Offerings (Icos) the Class of 2017 – One Year Later
EY study: Initial Coin Offerings (ICOs) The Class of 2017 – one year later October 19, 2018 In December 2017, we analyzed the top ICOs that represented 87% ICO funding in 2017. In that report, we found high risks of fraud, theft and major problems with the accuracy of representations made by start-ups seeking funding. In this follow-up study, we revisit the same group of companies to analyze their progress and investment return: ► The performance of ICOs from The Class of 2017 did little to inspire confidence.1 ► 86% are now below their listing2 price; 30% have lost substantially all value. Executive An investor purchasing a portfolio of The Class of 2017 ICOs on 1 January 2018 would most likely have lost 66% of their investment. ► Of the ICO start-ups we looked at from The Class of 2017, only 29% (25) have summary working products or prototypes, up by just 13% from the end of last year. Of those 25, seven companies accept payment in both traditional fiat currency (dollars) as well as ICO tokens, a decision that reduces the value of the tokens to the holders. ► There were gains among The Class of 2017, concentrated in 10 ICO tokens, most of which are in the blockchain infrastructure category. However, there is no sign that these new projects have had any success in reducing the dominance of Ethereum as the industry’s main platform. • 1 See methodology in appendix. • 2 Defined as when first available to trade on a cryptocurrency exchange. 02 ICO performance update ICOs broke out in 2017. -
FTC Decrypting Cryptocurrency Scams Workshop Transcript
FTC Decrypting Cryptocurrency Scams Workshop June 25, 2018 Transcript JASON ADLER: Good afternoon, everyone and welcome to the Federal Trade Commission's Decrypting Cryptocurrency Scams workshop. I'm Jason Adler. I'm the assistant director of the FDC's Midwest regional office here in Chicago. I want to thank you all for being here. And I want to thank DePaul University for hosting us. Before we get started, I just have a few housekeeping details to tick off. First, please set your mobile phones to silent. If you use them during the workshop, for example to comment about the workshop on social media, please be respectful of the others here. If you do comment on social media, feel free to use #cryptoscamsftc as a hashtag. We'll be live tweeting this event using that hashtag as well. Webcasting the event today, and it may be photographed or otherwise recorded, by participating you're agreeing that your image and anything you say may be posted at ftc.gov and on our social media sites. At the end of each panel, if we do have time, we'll try to answer audience questions. We have question cards out in the hall. Feel free to write down a question. Raise your hand and someone will collect it. And if we have time at the end of the panel, we'll ask them. We're also accepting questions on Twitter. So you can tweet a question to the FTC, so @FTC using hashtag #cryptoscamsftc. Finally, if you're here for CLE, please be sure and find Dan at the check in table. -
On Scaling Decentralized Blockchains (A Position Paper)
On Scaling Decentralized Blockchains (A Position Paper) Kyle Croman0;1, Christian Decker4, Ittay Eyal0;1, Adem Efe Gencer0;1, Ari Juels0;2, Ahmed Kosba0;3, Andrew Miller0;3, Prateek Saxena6, Elaine Shi0;1, Emin G¨un Sirer0;1, Dawn Song0;5, and Roger Wattenhofer4 0 Initiative for CryptoCurrencies and Contracts (IC3) 1 Cornell 2 Jacobs, Cornell Tech 3 UMD 4 ETH 5 Berkeley 6 NUS Abstract. The increasing popularity of blockchain-based cryptocurren- cies has made scalability a primary and urgent concern. We analyze how fundamental and circumstantial bottlenecks in Bitcoin limit the abil- ity of its current peer-to-peer overlay network to support substantially higher throughputs and lower latencies. Our results suggest that repa- rameterization of block size and intervals should be viewed only as a first increment toward achieving next-generation, high-load blockchain proto- cols, and major advances will additionally require a basic rethinking of technical approaches. We offer a structured perspective on the design space for such approaches. Within this perspective, we enumerate and briefly discuss a number of recently proposed protocol ideas and offer several new ideas and open challenges. 1 Introduction Increasing adoption of cryptocurrencies has raised concerns about their abil- ity to scale. Since Bitcoin is a self-regulating system that works by discovering blocks at approximate intervals, its highest transaction throughput is effectively capped at maximum block size divided by block interval. The current trend of ever increasing block sizes on Bitcoin portends a potential problem where the sys- tem will reach its maximum capacity to clear transactions, probably by 2017 [46]. -
On Scalability of Blockchain Technologies
ON SCALABILITY OF BLOCKCHAIN TECHNOLOGIES A Dissertation Presented to the Faculty of the Graduate School of Cornell University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy by Adem Efe Gencer August 2017 c 2017 Adem Efe Gencer ALL RIGHTS RESERVED ON SCALABILITY OF BLOCKCHAIN TECHNOLOGIES Adem Efe Gencer, Ph.D. Cornell University 2017 In this dissertation, we explore how to improve scalability of blockchains while maintaining their fundamental premise of decentralization. Scalable blockchains are capable of delivering a target throughput and latency in the presence of increasing workload. To this end, first we present Bitcoin-NG, a new blockchain protocol designed to provide scale for services involving fre- quent, high-volume interactions. This Byzantine fault tolerant blockchain pro- tocol is robust to extreme churn and shares the same trust model as Bitcoin. We experimentally demonstrate that Bitcoin-NG scales optimally, with band- width limited only by the capacity of the individual nodes and latency limited only by the propagation time of the network. Then, we examine the scalabil- ity challenges arising from proliferation of blockchain services. In particular, we observe that due to inherently single-service oriented blockchain protocols, services can bloat the existing blockchains, fail to provide sufficient security, or completely forego the property of trustless auditability. We introduce Aspen, a sharded blockchain protocol that securely scales with increasing number of services. Aspen enables service integration without compromising security — leveraging the trust assumptions — or flooding users with irrelevant messages. Finally, we provide the means to assess the viability of different scaling solu- tions. We develop and utilize custom metrics for evaluating performance and security of blockchain protocols. -
“Satoshi Is Dead. Long Live Satoshi”: the Curious Case of Bitcoin's Creator
“SATOSHI IS DEAD. LONG LIVE SATOSHI”: THE CURIOUS CASE OF BITCOIN’S CREATOR Mariam Humayun and Russell W. Belk ABSTRACT Purpose: In this paper, we focus on the mythic nature of the anonymous Bitcoin creator, Satoshi Nakamoto. Drawing on ideas from Foucault and Barthes on authorship, we analyze the notion of the absence of the author and how that sustains the brand. Design/methodology/approach: Based on interview data, participant obser- vation, archival data, and a netnography, we examine the discourses that emerge in the wake of multiple Satoshi Nakamoto exposés that serve as both stabilizing and destabilizing forces in the Bitcoin ecosystem. Findings: We analyze the different interpretations of Satoshi Nakamoto through his own text and how his readers interpret him. We identify how consumers employ motifs of myth and religiosity in trying to find meaning in Satoshi’s disappearance. His absence allows for multiple interpretations of how the Bitcoin brand is viewed and adopted by a diverse community of enthusiasts. Consumer Culture Theory Research in Consumer Behavior, Volume 19, 19–35 Copyright © 2018 by Emerald Publishing Limited All rights of reproduction in any form reserved ISSN: 0885-2111/doi:10.1108/S0885-211120180000019002 19 20 MARIAM HUMAYUN AND RUSSELL W. BELK Implications: Our findings provide a richer understanding of how, in a period of celebrity brands, Satoshi Nakamoto’s anti-celebrity stance helps sustain the Bitcoin ecosystem. Originality/value: Our analysis examines the nature of anonymity in our hyper-celebrity culture and the mystique of the anonymous creator that fuels modern-day myths for brands without owners. Keywords: brands; myth; anonymity; privacy; death of the author; anti-celebrity; religiosity; bitcoin; blockchain; Satoshi Nakamoto A legend has emerged from a jumble of facts: Someone using the name Satoshi Nakamoto released the software for Bitcoin in early 2009 and communicated with the nascent cur- rency’s users via email — but never by phone or in person. -
In Re Ripple Labs Inc. Litigation 18-CV-06753-Consolidated
Case 4:18-cv-06753-PJH Document 63 Filed 08/05/19 Page 1 of 53 1 James Q. Taylor-Copeland (284743) [email protected] 2 TAYLOR-COPELAND LAW 501 W. Broadway, Suite 800 3 San Diego, CA 92101 Telephone: (619) 400-4944 4 Facsimile: (619) 566-4341 5 Marc M. Seltzer (54534) [email protected] 6 Steven G. Sklaver (237612) [email protected] 7 Oleg Elkhunovich (269238) [email protected] 8 Meng Xi (280099) [email protected] 9 SUSMAN GODFREY L.L.P. 1900 Avenue of the Stars, 14th Floor 10 Los Angeles, CA 90067 Telephone: (310) 789-3100 11 Facsimile: (310) 789-3150 12 Counsel for Lead Plaintiff Bradley Sostack 13 UNITED STATES DISTRICT COURT 14 NORTHERN DISTRICT OF CALIFORNIA 15 OAKLAND DIVISION 16 ) Case No. 4:18-cv-06753-PJH 17 In re RIPPLE LABS INC. LITIGATION, ) ) CLASS ACTION 18 ____________________________________ ) ) CONSOLIDATED COMPLAINT FOR 19 This Document Relates To: ) VIOLATIONS OF FEDERAL AND ) CALIFORNIA LAW 20 ALL ACTIONS ) ) 21 ) JURY TRIAL DEMANDED 22 23 24 25 26 27 28 CONSOLIDATED COMPLAINT Case 4:18-cv-06753-PJH Document 63 Filed 08/05/19 Page 2 of 53 1 TABLE OF CONTENTS 2 SUMMARY OF ACTION ...................................................................................................2 3 PARTIES .............................................................................................................................6 4 JURISDICTION AND VENUE ..........................................................................................6 5 SUBSTANTIVE ALLEGATIONS .....................................................................................7 -
Bitcoin: Technical Background and Data Analysis
Finance and Economics Discussion Series Divisions of Research & Statistics and Monetary Affairs Federal Reserve Board, Washington, D.C. Bitcoin: Technical Background and Data Analysis Anton Badev and Matthew Chen 2014-104 NOTE: Staff working papers in the Finance and Economics Discussion Series (FEDS) are preliminary materials circulated to stimulate discussion and critical comment. The analysis and conclusions set forth are those of the authors and do not indicate concurrence by other members of the research staff or the Board of Governors. References in publications to the Finance and Economics Discussion Series (other than acknowledgement) should be cleared with the author(s) to protect the tentative character of these papers. Bitcoin: Technical Background and Data Analysis Anton Badev Matthew Chen∗ October 7, 2014 Executive summary Broadly speaking, Bitcoin is a scheme designed to facilitate the transfer of value be- tween parties. Unlike traditional payment systems, which transfer funds denominated in sovereign currencies, Bitcoin has its own metric for value called bitcoin (with lowercase letter \b", and abbreviated as BTC1). Bitcoin is a complex scheme, and its implementa- tion involves a combination of cryptography, distributed algorithms, and incentive driven behaviour. Moreover, recent developments suggest that Bitcoin operations may involve risks whose nature and proportion are little, if at all, understood. In light of these con- siderations, the purpose of this paper is to provide the necessary technical background to understand basic Bitcoin operations and document a set of empirical regularities related to Bitcoin usage. We present the micro-structure of the Bitcoin transaction process and highlight the use of cryptography for the purposes of transaction security and distributed maintenance of a ledger.