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Chia Proof of Space Construction
Chia Proof of Space Construction Introduction In order to create a secure blockchain consensus algorithm using disk space, a Proof of Space is scheme is necessary. This document describes a practical contruction of Proofs of Space, based on Beyond Hellman’s Time- Memory Trade-Offs with Applications to Proofs of Space [1]. We use the techniques laid out in that paper, extend it from 2 to 7 tables, and tweak it to make it efficient and secure, for use in the Chia Blockchain. The document is divided into three main sections: What (mathematical definition of a proof of space), How (how to implement proof of space), and Why (motivation and explanation of the construction) sections. The Beyond Hellman paper can be read first for more mathematical background. Chia Proof of Space Construction Introduction What is Proof of Space? Definitions Proof format Proof Quality String Definition of parameters, and M, f, A, C functions: Parameters: f functions: Matching function M: A′ function: At function: Collation function C: How do we implement Proof of Space? Plotting Plotting Tables (Concepts) Tables Table Positions Compressing Entry Data Delta Format ANS Encoding of Delta Formatted Points Stub and Small Deltas Parks Checkpoint Tables Plotting Algorithm Final Disk Format Full algorithm Phase 1: Forward Propagation Phase 2: Backpropagation Phase 3: Compression Phase 4: Checkpoints Sort on Disk Plotting Performance Space Required Proving Proof ordering vs Plot ordering Proof Retrieval Quality String Retrieval Proving Performance Verification Construction -
Virtual Currencies and Terrorist Financing : Assessing the Risks And
DIRECTORATE GENERAL FOR INTERNAL POLICIES POLICY DEPARTMENT FOR CITIZENS' RIGHTS AND CONSTITUTIONAL AFFAIRS COUNTER-TERRORISM Virtual currencies and terrorist financing: assessing the risks and evaluating responses STUDY Abstract This study, commissioned by the European Parliament’s Policy Department for Citizens’ Rights and Constitutional Affairs at the request of the TERR Committee, explores the terrorist financing (TF) risks of virtual currencies (VCs), including cryptocurrencies such as Bitcoin. It describes the features of VCs that present TF risks, and reviews the open source literature on terrorist use of virtual currencies to understand the current state and likely future manifestation of the risk. It then reviews the regulatory and law enforcement response in the EU and beyond, assessing the effectiveness of measures taken to date. Finally, it provides recommendations for EU policymakers and other relevant stakeholders for ensuring the TF risks of VCs are adequately mitigated. PE 604.970 EN ABOUT THE PUBLICATION This research paper was requested by the European Parliament's Special Committee on Terrorism and was commissioned, overseen and published by the Policy Department for Citizens’ Rights and Constitutional Affairs. Policy Departments provide independent expertise, both in-house and externally, to support European Parliament committees and other parliamentary bodies in shaping legislation and exercising democratic scrutiny over EU external and internal policies. To contact the Policy Department for Citizens’ Rights and Constitutional Affairs or to subscribe to its newsletter please write to: [email protected] RESPONSIBLE RESEARCH ADMINISTRATOR Kristiina MILT Policy Department for Citizens' Rights and Constitutional Affairs European Parliament B-1047 Brussels E-mail: [email protected] AUTHORS Tom KEATINGE, Director of the Centre for Financial Crime and Security Studies, Royal United Services Institute (coordinator) David CARLISLE, Centre for Financial Crime and Security Studies, Royal United Services Institute, etc. -
IPFS and Friends: a Qualitative Comparison of Next Generation Peer-To-Peer Data Networks Erik Daniel and Florian Tschorsch
1 IPFS and Friends: A Qualitative Comparison of Next Generation Peer-to-Peer Data Networks Erik Daniel and Florian Tschorsch Abstract—Decentralized, distributed storage offers a way to types of files [1]. Napster and Gnutella marked the beginning reduce the impact of data silos as often fostered by centralized and were followed by many other P2P networks focusing on cloud storage. While the intentions of this trend are not new, the specialized application areas or novel network structures. For topic gained traction due to technological advancements, most notably blockchain networks. As a consequence, we observe that example, Freenet [2] realizes anonymous storage and retrieval. a new generation of peer-to-peer data networks emerges. In this Chord [3], CAN [4], and Pastry [5] provide protocols to survey paper, we therefore provide a technical overview of the maintain a structured overlay network topology. In particular, next generation data networks. We use select data networks to BitTorrent [6] received a lot of attention from both users and introduce general concepts and to emphasize new developments. the research community. BitTorrent introduced an incentive Specifically, we provide a deeper outline of the Interplanetary File System and a general overview of Swarm, the Hypercore Pro- mechanism to achieve Pareto efficiency, trying to improve tocol, SAFE, Storj, and Arweave. We identify common building network utilization achieving a higher level of robustness. We blocks and provide a qualitative comparison. From the overview, consider networks such as Napster, Gnutella, Freenet, BitTor- we derive future challenges and research goals concerning data rent, and many more as first generation P2P data networks, networks. -
Evaluating Inclusion, Equality, Security, and Privacy in Pseudonym Parties and Other Proofs of Personhood
Identity and Personhood in Digital Democracy: Evaluating Inclusion, Equality, Security, and Privacy in Pseudonym Parties and Other Proofs of Personhood Bryan Ford Swiss Federal Institute of Technology in Lausanne (EPFL) November 5, 2020 Abstract of enforced physical security and privacy can address the coercion and vote-buying risks that plague today’s E- Digital identity seems at first like a prerequisite for digi- voting and postal voting systems alike. We also examine tal democracy: how can we ensure “one person, one vote” other recently-proposed approaches to proof of person- online without identifying voters? But the full gamut of hood, some of which offer conveniencessuch as all-online digital identity solutions – e.g., online ID checking, bio- participation. These alternatives currently fall short of sat- metrics, self-sovereign identity, and social/trust networks isfying all the key digital personhood goals, unfortunately, – all present severe flaws in security, privacy, and trans- but offer valuable insights into the challenges we face. parency, leaving users vulnerable to exclusion, identity loss or theft, and coercion. These flaws may be insur- mountable because digital identity is a cart pulling the Contents horse. We cannot achieve digital identity secure enough to support the weight of digital democracy, until we can 1 Introduction 2 build it on a solid foundation of digital personhood meet- ing key requirements. While identity is about distinguish- 2 Goals for Digital Personhood 4 ing one person from another through attributes or affilia- tions, personhood is about giving all real people inalien- 3 Pseudonym Parties 5 able digital participation rights independent of identity, 3.1 Thebasicidea. -
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. -
Lab 5: Bittorrent Client Implementation
Lab 5: BitTorrent Client Implementation Due: Nov. 30th at 11:59 PM Milestone: Nov. 19th during Lab Overview In this lab, you and your lab parterner will develop a basic BitTorrent client that can, at minimal, exchange a file between multiple peers, and at best, function as a full feature BitTorrent Client. The programming in this assignment will be in C requiring standard sockets, and thus you will not need to have root access. You should be able to develop your code on any CS lab machine or your personal machine, but all code will be tested on the CS lab. Deliverable Your submission should minimally include the following programs and files: • REDME • Makefile • bencode.c|h • bt lib.c|h • bt setup.c|h • bt client • client trace.[n].log • sample torrent.torrent Your README file should contain a short header containing your name, username, and the assignment title. The README should additionally contain a short description of your code, tasks accomplished, and how to compile, execute, and interpret the output of your programs. Your README should also contain a list of all submitted files and code and the functionality implemented in different code files. This is a large assignment, and this will greatly aid in grading. As always, if there are any short answer questions in this lab write-up, you should provide well marked answers in the README, as well as indicate that you’ve completed any of the extra credit (so that I don’t forget to grade it). Milestones The entire assignment will be submitted and graded, but your group will also hold a milestone meeting to receive feedback on your current implementation. -
Banking on Bitcoin: BTC As Collateral
Banking on Bitcoin: BTC as Collateral Arcane Research Bitstamp Arcane Research is a part of Arcane Crypto, Bitstamp is the world’s longest-running bringing data-driven analysis and research cryptocurrency exchange, supporting to the cryptocurrency space. After launch in investors, traders and leading financial August 2019, Arcane Research has become institutions since 2011. With a proven track a trusted brand, helping clients strengthen record, cutting-edge market infrastructure their credibility and visibility through and dedication to personal service with a research reports and analysis. In addition, human touch, Bitstamp’s secure and reliable we regularly publish reports, weekly market trading venue is trusted by over four million updates and articles to educate and share customers worldwide. Whether it’s through insights. their intuitive web platform and mobile app or industry-leading APIs, Bitstamp is where crypto enters the world of finance. For more information, visit www.bitstamp.net 2 Banking on Bitcoin: BTC as Collateral Banking on bitcoin The case for bitcoin as collateral The value of the global market for collateral is estimated to be close to $20 trillion in assets. Government bonds and cash-based securities alike are currently the most important parts of a well- functioning collateral market. However, in that, there is a growing weakness as rehypothecation creates a systemic risk in the financial system as a whole. The increasing reuse of collateral makes these assets far from risk-free and shows the potential instability of the financial markets and that it is more fragile than many would like to admit. Bitcoin could become an important part of the solution and challenge the dominating collateral assets in the future. -
Is Bitcoin Rat Poison? Cryptocurrency, Crime, and Counterfeiting (Ccc)
IS BITCOIN RAT POISON? CRYPTOCURRENCY, CRIME, AND COUNTERFEITING (CCC) Eric Engle1 1 JD St. Louis, DEA Paris II, DEA Paris X, LL.M.Eur., Dr.Jur. Bremen, LL.M. Humboldt. Eric.Engle @ yahoo.com, http://mindworks.altervista.org. Dr. Engle beleives James Orlin Grabbe was the author of bitcoin, and is certain that Grabbe issued the first digital currency and is the intellectual wellspring of cryptocurrency. Kalliste! Copyright © 2016 Journal of High Technology Law and Eric Engle. All Rights Re- served. ISSN 1536-7983. 2016] IS BITCOIN RAT POISON? 341 Introduction Distributed cryptographic currency, most famously exempli- fied by bitcoin,2 is anonymous3 on-line currency backed by no state.4 The currency is generated by computation (“mining”), purchase, or trade.5 It is stored and tracked using peer-to-peer technology,6 which 2 See Jonathan B. Turpin, Note, Bitcoin: The Economic Case for A Global, Virtual Currency Operating in an Unexplored Legal Framework, 21 IND. J. GLOBAL LEGAL STUD. 335, 337-38 (2014) (describing how Bitcoin is a virtual currency). Bitcoin is supported by a distributed network of users and relies on advanced cryptography techniques to ensure its stability and reliability. A Bitcoin is simply a chain of digital signatures (i.e., a string of numbers) saved in a “wallet” file. This chain of signa- tures contains the necessary history of the specific Bitcoin so that the system may verify its legitimacy and transfer its ownership from one user to another upon request. A user's wallet consists of the Bitcoins it contains, a public key, and a private key. -
A Decentralized Cloud Storage Network Framework
Storj: A Decentralized Cloud Storage Network Framework Storj Labs, Inc. October 30, 2018 v3.0 https://github.com/storj/whitepaper 2 Copyright © 2018 Storj Labs, Inc. and Subsidiaries This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 license (CC BY-SA 3.0). All product names, logos, and brands used or cited in this document are property of their respective own- ers. All company, product, and service names used herein are for identification purposes only. Use of these names, logos, and brands does not imply endorsement. Contents 0.1 Abstract 6 0.2 Contributors 6 1 Introduction ...................................................7 2 Storj design constraints .......................................9 2.1 Security and privacy 9 2.2 Decentralization 9 2.3 Marketplace and economics 10 2.4 Amazon S3 compatibility 12 2.5 Durability, device failure, and churn 12 2.6 Latency 13 2.7 Bandwidth 14 2.8 Object size 15 2.9 Byzantine fault tolerance 15 2.10 Coordination avoidance 16 3 Framework ................................................... 18 3.1 Framework overview 18 3.2 Storage nodes 19 3.3 Peer-to-peer communication and discovery 19 3.4 Redundancy 19 3.5 Metadata 23 3.6 Encryption 24 3.7 Audits and reputation 25 3.8 Data repair 25 3.9 Payments 26 4 4 Concrete implementation .................................... 27 4.1 Definitions 27 4.2 Peer classes 30 4.3 Storage node 31 4.4 Node identity 32 4.5 Peer-to-peer communication 33 4.6 Node discovery 33 4.7 Redundancy 35 4.8 Structured file storage 36 4.9 Metadata 39 4.10 Satellite 41 4.11 Encryption 42 4.12 Authorization 43 4.13 Audits 44 4.14 Data repair 45 4.15 Storage node reputation 47 4.16 Payments 49 4.17 Bandwidth allocation 50 4.18 Satellite reputation 53 4.19 Garbage collection 53 4.20 Uplink 54 4.21 Quality control and branding 55 5 Walkthroughs ............................................... -
Introducing Uni, Yfi and Snx at Bitstamp with Zero Fees Until the End of July!
2021. 4. 27. News and updates – Bitstamp NEW RESEARCH: The state of Bitcoin as collateral. - Read more × News INTRODUCING UNI, YFI AND SNX AT BITSTAMP WITH ZERO FEES UNTIL THE END OF JULY! 26 APR 2021 We are further expanding our support for the growing DeFi space with another trio of new listings. The new assets each cover a unique use case and should be an exciting addition to the portfolios of both DeFi enthusiasts as well as rst-time entrants to the space. We are listing the following cryptocurrencies: ● Uniswap (UNI) – an automated trading and liquidity protocol that enables decentralized trading of tokens through the Uniswap DEX ● Yearn.nance (YFI) – a DeFi service created to help non-technical users maximize returns from yield farming ● Synthetix (SNX) – a DeFi protocol for creating on-chain derivatives (called synths) based on both crypto and non-crypto assets All of these cryptocurrencies will trade with zero fees until the end of July! Please note that for the time being, these assets will not be available to our US customers. Listing schedule: 1. Transfer-only mode: Deposits and withdrawals open but trading is not enabled yet. UNI, YFI, SNX: Monday, 3 May 2. Post-only mode: You will be able to place and cancel limit orders, but they will not be matched. Therefore, no orders will actually be completed during this stage. https://www.bitstamp.net/news/ 1/19 2021. 4. 27. News and updates – Bitstamp UNI: Tuesday, 4 May, at 8:00 AM UTC YFI: Wednesday, 5 May, at 8:00 AM UTC SNX: Thursday, 6 May,NEW at 8:00RESEARCH: AM UTC The state of Bitcoin as collateral. -
How to Invest in Filecoin
How to Invest in Filecoin Part I: Preparing to Invest Filecoin investments will be made on CoinList (coinlist.co), a US-based funding platform that connects investors to promising early-stage token sales. Created by Protocol Labs in partnership with AngelList, CoinList simplifies the token sale process and implements robust legal frameworks for token sales in the U.S. Before the sale begins, you will need to complete several preparation steps. Note that some steps include wait time of several days. For this reason, we recommend getting started as soon as possible and working in parallel while waiting for other steps to be reviewed or confirmed. Step 1: Create a CoinList account (5 min) Visit https://coinlist.co. Sign in with your AngelList account, or create a new account if needed. Step 2: Become a US accredited investor through AngelList (30 min + 1-3 day review) All token investors will need to meet US accredited investor requirements. Non-US investors can invest, but must meet the same requirements. You will be prompted to submit accreditation evidence. Step 3: Submit information for KYC/AML checks (15 min + instant review if no issues) You will be prompted to submit the details required for KYC/AML (Know Your Customer/Anti-Money Laundering) checks as soon as accreditation evidence has been submitted. You do not need to wait until accreditation review is complete. Step 4: Transfer funds to relevant accounts (10min + 1-5 day wait) You can invest with your choice of the following currencies: US Dollars, Bitcoin, Ether, and Zcash. To invest using US Dollars: Go to https://coinlist.co/settings/wallet. -
A Survey on Volatility Fluctuations in the Decentralized Cryptocurrency Financial Assets
Journal of Risk and Financial Management Review A Survey on Volatility Fluctuations in the Decentralized Cryptocurrency Financial Assets Nikolaos A. Kyriazis Department of Economics, University of Thessaly, 38333 Volos, Greece; [email protected] Abstract: This study is an integrated survey of GARCH methodologies applications on 67 empirical papers that focus on cryptocurrencies. More sophisticated GARCH models are found to better explain the fluctuations in the volatility of cryptocurrencies. The main characteristics and the optimal approaches for modeling returns and volatility of cryptocurrencies are under scrutiny. Moreover, emphasis is placed on interconnectedness and hedging and/or diversifying abilities, measurement of profit-making and risk, efficiency and herding behavior. This leads to fruitful results and sheds light on a broad spectrum of aspects. In-depth analysis is provided of the speculative character of digital currencies and the possibility of improvement of the risk–return trade-off in investors’ portfolios. Overall, it is found that the inclusion of Bitcoin in portfolios with conventional assets could significantly improve the risk–return trade-off of investors’ decisions. Results on whether Bitcoin resembles gold are split. The same is true about whether Bitcoins volatility presents larger reactions to positive or negative shocks. Cryptocurrency markets are found not to be efficient. This study provides a roadmap for researchers and investors as well as authorities. Keywords: decentralized cryptocurrency; Bitcoin; survey; volatility modelling Citation: Kyriazis, Nikolaos A. 2021. A Survey on Volatility Fluctuations in the Decentralized Cryptocurrency Financial Assets. Journal of Risk and 1. Introduction Financial Management 14: 293. The continuing evolution of cryptocurrency markets and exchanges during the last few https://doi.org/10.3390/jrfm years has aroused sparkling interest amid academic researchers, monetary policymakers, 14070293 regulators, investors and the financial press.