Bitcoin and Block Chain Currency
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A Solution Towards Eliminating Transaction Malleability in Bitcoin
J Inf Process Syst, Vol.14, No.4, pp.837~850, August 2018 ISSN 1976-913X (Print) https://doi.org/10.3745/JIPS.03.0101 ISSN 2092-805X (Electronic) A Solution towards Eliminating Transaction Malleability in Bitcoin Ubaidullah Rajput*, Fizza Abbas*, and Heekuck Oh** Abstract Bitcoin is a decentralized crypto-currency, which is based on the peer-to-peer network, and was introduced by Satoshi Nakamoto in 2008. Bitcoin transactions are written by using a scripting language. The hash value of a transaction’s script is used to identify the transaction over the network. In February 2014, a Bitcoin exchange company, Mt. Gox, claimed that they had lost hundreds of millions US dollars worth of Bitcoins in an attack known as transaction malleability. Although known about since 2011, this was the first known attack that resulted in a company loosing multi-millions of US dollars in Bitcoins. Our reason for writing this paper is to understand Bitcoin transaction malleability and to propose an efficient solution. Our solution is a softfork (i.e., it can be gradually implemented). Towards the end of the paper we present a detailed analysis of our scheme with respect to various transaction malleability-based attack scenarios to show that our simple solution can prevent future incidents involving transaction malleability from occurring. We compare our scheme with existing approaches and present an analysis regarding the computational cost and storage requirements of our proposed solution, which shows the feasibility of our proposed scheme. Keywords Crypto-currency, Bitcoin, Transaction Malleability 1. Introduction After its introduction in 2008 by Satoshi Nakamoto, the Bitcoin crypto-currency has gained significant popularity amongst other various crypto-currencies. -
Geraszimov-Doktrína – Egy Másik Megvilágításban
KATONAI NEMZETBIZTONSÁGI SZOLGÁLAT XVI. évfolyam 3–4. szám FELDERÍTŐ SZEMLE ALAPÍTVA: 2002 BUDAPEST 2017 A Katonai Nemzetbiztonsági Szolgálat tudományos-szakmai folyóirata Felelős kiadó Kovács József altábornagy, főigazgató Szerkesztőbizottság Elnök: Dr. Béres János vezérőrnagy Tagok: Dezső Sándor vezérőrnagy Dr. Magyar István ny. dandártábornok Dr. Tömösváry Zsigmond ny. dandártábornok Deák Anita alezredes Dr. Fürjes János alezredes Háry Szabolcs ezredes Dr. Magyar Sándor ezredes Dr. Tóth Sándor alezredes Dr. Vida Csaba alezredes Felelős szerkesztő: Deák Anita alezredes Olvasószerkesztő: Gál Csaba ny. ezredes Tördelőszerkesztő: Tóth Krisztina tzls. HU ISSN 1588-242X TARTALOM BIZTONSÁGPOLITIKA HOLECZ JÓZSEF ALEZREDES A GERASZIMOV-DOKTRÍNA – EGY MÁSIK MEGVILÁGÍTÁSBAN ...................................................... 5 BERTALAN DÁVID OGY. ALEZREDES A BIZTONSÁGI SZEKTOR SPECIÁLIS VONÁSAI .......................... 28 MEZŐ ANDRÁS ALEZREDES A DOKTRÍNAFEJLESZTÉS NEMZETKÖZI TAPASZTALATAI ... 45 HEGYI ÁGNES SZÁZADOS TERRORIZMUS A SZÁHEL-ÖVEZETBEN ....................................... 74 DR. GERENCSÉR ÁRPÁD KÖZÉP-ÁZSIAI SZÉLSŐSÉGES MOZGALMAK MEGJELENÉSI FORMÁI ÉS JELENTŐSÉGE .................................. 87 HÍRSZERZÉS – FELDERÍTÉS KOÓS GÁBOR NY. ALEZREDES – PROF. DR. SZTERNÁK GYÖRGY NY. EZREDES A FEGYVERES KÜZDELEM JELLEMZŐI KUTATÁSÁNAK FONTOSSÁGA, A HÍRSZERZÉS ÉS A FELDERÍTÉS JELENTŐSÉGE ..................... 97 DR. VIDA CSABA ALEZREDES AZ ELEMZŐ-ÉRTÉKELŐ MUNKA TERMÉKEI – NEMZETBIZTONSÁGI TÁJÉKOZTATÓK KÉSZÍTÉSE .............. 112 -
Bitcoin and Money Laundering: Mining for an Effective Solution
Indiana Law Journal Volume 89 Issue 1 Article 13 Winter 2014 Bitcoin and Money Laundering: Mining for an Effective Solution Danton Bryans Indiana University Maurer School of Law, [email protected] Follow this and additional works at: https://www.repository.law.indiana.edu/ilj Part of the Internet Law Commons, and the Law and Economics Commons Recommended Citation Bryans, Danton (2014) "Bitcoin and Money Laundering: Mining for an Effective Solution," Indiana Law Journal: Vol. 89 : Iss. 1 , Article 13. Available at: https://www.repository.law.indiana.edu/ilj/vol89/iss1/13 This Note is brought to you for free and open access by the Law School Journals at Digital Repository @ Maurer Law. It has been accepted for inclusion in Indiana Law Journal by an authorized editor of Digital Repository @ Maurer Law. For more information, please contact [email protected]. Bitcoin and Money Laundering: Mining for an Effective Solution * DANTON BRYANS INTRODUCTION Technology forges ahead at a rapid pace, whether we like it or not. Criminals recognize this inevitability and use technological improvements to advance their craft,1 committing crimes from half a world away in real time. Meticulous criminals also use technological advancements to distance themselves from their illegal activities and profits through use of virtual banking and electronic money transfer systems, which allow criminals to buy, sell, and exchange goods without any physical interaction. Though such services use digital logs that serve to identify a sender and a receiver’s digital identities, criminals possess the means to obfuscate their digital identity by simply spoofing their Internet Protocol address or by using another individual’s account, essentially making their activities untraceable. -
A Bitcoin Governance Network: the Multi-Stakeholder Solution to the Challenges of Cryptocurrency
A BITCOIN GOVERNANCE NETWORK: The Multi-stakeholder Solution to the Challenges of Cryptocurrency Alex Tapscott Director, Institutional Equity Sales Canaccord Genuity Cryptocurrencies are products of the digital revolution and the networked age. As distributed networks with no central issuer and no central command, they are also a distinctly global phenomenon that will force national governments to not only re-evaluate a number of substantive regulatory issues but perhaps also re-think the very nature of governance itself. Cryptocurrencies are wresting control over many issues from traditional decision-makers. Multi-stakeholder governance, founded on principles of transparency and inclusiveness and legitimized by consensus, is the 21st century solution. When leaders of the old paradigm adapt and collaborate more closely with private enterprise, civil society organizations and other stakeholders in the network, then bitcoin and other cryptocurrency technologies can fulfill their potential and gain widespread adoption. © Global Solution Networks 2014 A Bitcoin Governance Network: The Multi-stakeholder Solution to the Challenges of Cryptocurrency i Table of Contents Idea in Brief 1 The Challenge for Governments 2 How Cryptocurrencies Work 4 Bitcoin Volatility and Price 5 Opportunities and Challenges 6 Opportunities 6 Challenges 11 A Bitcoin Governance Network 13 GSN Types for a Bitcoin Governance Network 16 Standards Networks 16 Policy Networks 18 Knowledge Networks 19 Watchdog Networks 20 The GSN Approach: Core Principles, Conclusions and -
Cryptocurrency and the Blockchain: Technical Overview and Potential Impact on Commercial Child Sexual Exploitation
Cryptocurrency and the BlockChain: Technical Overview and Potential Impact on Commercial Child Sexual Exploitation Prepared for the Financial Coalition Against Child Pornography (FCACP) and the International Centre for Missing & Exploited Children (ICMEC) by Eric Olson and Jonathan Tomek, May 2017 Foreword The International Centre for Missing & Exploited Children (ICMEC) advocates, trains and collaborates to eradicate child abduction, sexual abuse and exploitation around the globe. Collaboration – one of the pillars of our work – is uniquely demonstrated by the Financial Coalition Against Child Pornography (FCACP), which was launched in 2006 by ICMEC and the National Center for Missing & Exploited Children. The FCACP was created when it became evident that people were using their credit cards to buy images of children being sexually abused online. Working alongside law enforcement, the FCACP followed the money to disrupt the economics of the child pornography business, resulting in the virtual elimination of the use of credit cards in the United States for the purchase of child sexual abuse content online. And while that is a stunning accomplishment, ICMEC and the FCACP are mindful of the need to stay vigilant and continue to fight those who seek to profit from the sexual exploitation of children. It is with this in mind that we sought to research cryptocurrencies and the role they play in commercial sexual exploitation of children. This paper examines several cryptocurrencies, including Bitcoin, and the Blockchain architecture that supports them. It provides a summary of the underground and illicit uses of the currencies, as well as the ramifications for law enforcement and industry. ICMEC is extremely grateful to the authors of this paper – Eric Olson and Jonathan Tomek of LookingGlass Cyber Solutions. -
Bitcoin Dealers Charged in US with Money Laundering (Update) 27 January 2014, by Rob Lever
Bitcoin dealers charged in US with money laundering (Update) 27 January 2014, by Rob Lever John F. Kennedy International Airport in New York, officials said. Authorities did not name the company involved in the scheme, but Shrem is chief executive of BitInstant and is a self-described "Bitcoin evangelist" whose venture is backed by Tyler and Cameron Winklevoss, known for a legal spat over the founding of Facebook. Shrem is also vice chair of the Bitcoin Foundation, a group aimed at promoting use of the crypto- currency. The Winklevoss brothers said in a statement Monday they were "passive" investors in BitInstant A pile of Bitcoin slugs sit in a box on April 26, 2013 in and believed it complied with all laws. Sandy, Utah "When we invested in BitInstant in the fall of 2012, US authorities Monday filed criminal charges its management made a commitment to us that against two operators of a Bitcoin exchange, they would abide by all applicable laws—including including the head of a company with high-profile money laundering laws—and we expected nothing investment backers. less," said the statement. A criminal complaint unsealed by officials said the "Although BitInstant is not named in today's Bitcoin exchange violated money laundering laws indictment of Charlie Shrem, we are obviously by allowing its users to buy drugs and other illicit deeply concerned about his arrest...and will do goods on the Silk Road underground website. everything we can to help law enforcement officials. We fully support any and all governmental efforts to Federal prosecutors said they charged Robert ensure that money laundering requirements are Faiella and Charlie Shrem, who ran a company enforced." allowing people to use cash to buy Bitcoins, a virtual currency based on a mysterious computer Faiella, 52, was arrested at his home Monday in algorithm. -
To the House Committee on Consumer Protection and Commerce
STATE OF HAWAII DAVID Y. IGE CATHERINE P. AWAKUNI COLÓN GOVERNOR OFFICE OF THE DIRECTOR DIRECTOR DOUGLAS S. CHIN DEPARTMENT OF COMMERCE AND CONSUMER AFFAIRS JO ANN M. UCHIDA TAKEUCHI LIEUTENANT GOVERNOR DEPUTY DIRECTOR 335 MERCHANT STREET, ROOM 310 P.O. BOX 541 HONOLULU, HAWAII 96809 Phone Number: 586-2850 Fax Number: 586-2856 cca.hawaii.gov TO THE HOUSE COMMITTEE ON CONSUMER PROTECTION AND COMMERCE TWENTY-NINTH LEGISLATURE Regular Session of 2018 Friday, February 9, 2018 2:00 p.m. TESTIMONY ON HOUSE BILL NO. 2257, H.D. 1 , RELATING TO VIRTUAL CURRENCY. TO THE HONORABLE ROY M. TAKUMI, CHAIR, AND MEMBERS OF THE COMMITTEE: The Department of Commerce and Consumer Affairs (“Department”) appreciates the opportunity to testify on H.B. 2257, H.D. 1, Relating to Virtual Currency. My name is Iris Ikeda, and I am the Commissioner of Financial Institutions (“Commissioner”) for the Department’s Division of Financial Institutions (“DFI”). The Department submits comments on Part I of this bill. The Department supports Part II of this bill (bill sections 2 through 12); the content of Part II is companion to S.B. 3082. H.B. 2257, H.D. 1 is a compilation of two pathways to manage the virtual currency industry: • Part I of the bill (bill section 1) is the proposed model law from the Uniform Law Commission’s (“ULC”) Uniform Regulation of Virtual Currency Businesses Act (“URVCBA” or “model law”). The URVCBA proposes a framework for regulating virtual currencies as a new regulatory scheme to be supervised and regulated by DFI; and House Bill No. -
Testimony of Patrick Murck General Counsel, the Bitcoin Foundation To
Testimony of Patrick Murck General Counsel, the Bitcoin Foundation to the Senate Committee on Homeland Security and Governmental Affairs “Beyond Silk Road: Potential Risks, Threats, and Promises of Virtual Currencies” November 18, 2013 Executive Summary Bitcoin is a decentralized store of value and open-ledger payment network that operates securely, efficiently, and at low cost without the need for any third-party intermediaries. The Bitcoin protocol allows individuals or service providers access to a global financial system that will see rapid innovation. Bitcoin and digital currency alone will not alleviate issues of poverty and financial exclusion that effect vulnerable populations around the world. However, Bitcoin can provide a safe store of wealth and a global transaction network that cannot be corrupted or abused by those who would seek to exploit or harm vulnerable populations. It can help advance liberty and dignity for people worldwide, restore financial privacy for law-abiding people, and provide a stable money supply in countries where the currency may be mismanaged. The United States has an acute interest in maintaining its place as a global leader in developing this cutting edge technology, fostering financial services innovation, and spreading individual freedom and liberty around the globe. Applying consistent rules and regulations that encourage technological experimentation is critical to a vibrant entrepreneurial community, and this committee’s work may help to chart a safe and sane regulatory course for the digital economy in general and Bitcoin specifically. Though challenges exist, Bitcoin does not pose a unique or unsolvable challenge to law enforcement or existing regulatory structures. Bitcoin service providers enter a highly regulated marketplace with deeply entrenched competitors. -
Dot-Bip Whitepaper
DOT-BIP WHITEPAPER a/k/a Proposal for implementing Dot-Bip decentralized DNS to create distributed, difficult-to-censor DNS-type function over the BipCoin cryptocurrency blockchain while solving all the problems that kept Namecoin from becoming adopted as anything other than a speculative commodity SUMMARY: We are going to make something that is so difficult to censor, someone could use it to say horrible, untrue things about us and there's no way that even we could take it down. We believe this is the truest definition of actual free speech. Several systems have attempted to do this. The one that came closest was Namecoin. But Namecoin was never used by more than a couple dozen websites for censor-proof DNS. We plan to create something that will get wide scale adoption. That's the key to truly keeping speech free. Dot-Bit Whitepaper v1.2 1/8/2017 Indiegogo fundraiser: https://igg.me/at/dotbip This document and the software and processes it describes are covered by the BipCot NoGov License. This allows use and re-use with attribution by anyone except governments and government agents. http://bipcot.org/ Whitepaper written by MWD. First draft was published on Nov 25, 2016. [email protected] https://bipcoin.org/ 1 Abstract: Background: "DNS" is the method by which website names (like "google.com") are registered and can then be used by everyone to get to a particular website. This registration system is monopolized worldwide by a US Government-controlled organization. Thus domains can be censored and seized by simply rerouting them. -
Kryptoshare® SEND • SHARE • STORE the Future of Crypto
CRYPTOCURRENCY PROBLEMS, LIMITATIONS, RISKS & SOLUTIONS PRESENT BY: ZACHARY MUTTER BARI HERSCKOWITZ KryptoShare® SEND • SHARE • STORE The Future of Crypto *Patent Pending What is Cryptocurrency? u Form of either decentralized or centralized electronic cash u Incorporates digital signatures that create one way irreversible transactions u Reliant on timestamp network creating hash-based proof of work; creating blockchain u Longer the blockchain; harder to manipulate and steal (double-spend) cryptocurrency u More computing power proofing blockchain the better u 1st successful cryptocurrency Bitcoin. Others tried like Ecash in the 90s but failed due to centralization problems. Current Problems with Crypto ▶ Senders/receivers of crypto currencies are restricted to being forced to know or have: ▶ QR code ▶ 32+ Public Key (aka address) ▶ Without this info NO transactions can transpire ▶ Personal details are absent from senders/receivers of cryptocurrency ▶ Around 7 bitcoin transactions are able to be processed every second vs visa with about 1,700 per second. *Patent Pending Current Limits of Crypto Currency & Services u Limitations are only one address per type of crypto-currency. u Users can only send Bitcoin to a “Bitcoin only” address u Currently you can only send to people or businesses’ addresses you know, which are subject to change u Transactions are very data poor u Transactions can take minutes to days depending on the respective network load u Minimal connectivity on social media for crypto-currency users *Patent Pending Example of -
Virtual Currencies Bitcoin & What Now After Liberty Reserve, Silk Road
Richmond Journal of Law and Technology Volume 20 | Issue 4 Article 3 2014 Virtual Currencies Bitcoin & What Now After Liberty Reserve, Silk Road, and Mt. Gox? Lawrence Trautman Follow this and additional works at: http://scholarship.richmond.edu/jolt Part of the Banking and Finance Law Commons, and the Computer Law Commons Recommended Citation Lawrence Trautman, Virtual Currencies Bitcoin & What Now After Liberty Reserve, Silk Road, and Mt. Gox?, 20 Rich. J.L. & Tech 13 (2014). Available at: http://scholarship.richmond.edu/jolt/vol20/iss4/3 This Article is brought to you for free and open access by UR Scholarship Repository. It has been accepted for inclusion in Richmond Journal of Law and Technology by an authorized administrator of UR Scholarship Repository. For more information, please contact [email protected]. Richmond Journal of Law & Technology Volume XX, Issue 4 VIRTUAL CURRENCIES; BITCOIN & WHAT NOW AFTER LIBERTY RESERVE, SILK ROAD, AND MT. GOX? Lawrence Trautman* Cite as: Lawrence Trautman, Virtual Currencies Bitcoin & What Now After Liberty Reserve, Silk Road, and Mt. Gox?, 20 RICH. J.L. & TECH. 13 (2014), http://jolt.richmond.edu/v20i4/article13.pdf. I. OVERVIEW [1] During 2013, the U.S. Treasury Department evoked the first use of the 2001 Patriot Act1 to exclude virtual currency provider Liberty Reserve from the U.S. financial system.2 This article will discuss: the regulation of virtual currencies, cybercrimes and payment systems, darknets, Tor and the “deep web,” Bitcoin; Liberty Reserve, Silk Road, and Mt. Gox. Virtual currencies have quickly become a reality, gaining significant traction in a very short period of time, and are evolving rapidly. -
5. Blockchain Basics & Transactions, UTXO and Script Code
MITOCW | 5. Blockchain Basics & Transactions, UTXO and Script Code The following content is provided under a Creative Commons license. Your support will help MIT OpenCourseWare continue to offer high quality educational resources for free. To make a donation or to view additional materials from hundreds of MIT courses, visit MIT OpenCourseWare at ocw.mit.edu. GARY GENSLER: Thank you for everybody coming back. And I should tell you, when I start the session with that little shh, I learned from a congressman in Baltimore. As some of you know, I've spent a lot of time around politics. And one of my roles in politics was that I was the treasurer of the Maryland Democratic Party. Which, if you anybody ever asks you to be the treasurer of a state party, come. I can give you some advice about what that's all about when your home state senator asks you to do it. So I had to quiet down the annual Jefferson Jackson Day dinners. I'd organize these big dinners, and there's 400, 500, 600 people at these dinners. I couldn't do it. I couldn't get their attention. And Congressman Elijah Cummings comes up, and he just leans into the mic. Shh. And it quieted the whole place down. I said, Congressman, what is this? Is this something you've learned in politics, something you learned from your minister, your priest? He said, it works every time, works every time. So Elijah Cummings gave me that little duty. Blockchain and money, we're here. I know it's a little bit like eating broccoli these last couple of classes, because we went through cryptography, and then we moved a little bit into consensus protocols.