2020 Crypto Valley Conference on Blockchain Technology (CVCBT)最新文献

On the Confidentiality of Amounts in Grin 论Grin中金额的保密问题

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-06-01 DOI: 10.1109/CVCBT50464.2020.00012

Suyash Bagad, S. Vijayakumaran

{"title":"On the Confidentiality of Amounts in Grin","authors":"Suyash Bagad, S. Vijayakumaran","doi":"10.1109/CVCBT50464.2020.00012","DOIUrl":"https://doi.org/10.1109/CVCBT50464.2020.00012","url":null,"abstract":"Pedersen commitments have been adopted by several cryptocurrencies for hiding transaction amounts. While Pedersen commitments are perfectly hiding in isolation, the cryptocurrency transaction rules can reveal relationships between the amounts hidden in the commitments involved in the transaction. Such relationships can be combined with the public coin creation schedule to provide upper bounds on the number of coins in a commitment. In this paper, we consider the Grin cryptocurrency and derive upper bounds on the number of coins which can be present in regular transaction outputs. In a March 2020 snapshot of the Grin blockchain, we find that out of the 110,149 unspent regular transaction outputs 983 of them have less than 1800 grin (number of coins typically minted in half an hour) stored in them. On the other hand, 95% of the unspent regular transaction outputs in the snapshot have an upper bound which is at least 90% of the total Grin supply at their respective block heights. We conclude that while our method does not violate the confidentiality of the amounts in most of the outputs on the Grin blockchain, the amounts in some outputs can be estimated to be in a narrow range.","PeriodicalId":162064,"journal":{"name":"2020 Crypto Valley Conference on Blockchain Technology (CVCBT)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125804153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Proposal for a Comprehensive (Crypto) Asset Taxonomy 一个全面的(加密)资产分类提案

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-06-01 DOI: 10.1109/CVCBT50464.2020.00006

Thomas Ankenbrand, Denis Bieri, Roland Cortivo, Johannes Hoehener, T. Hardjono

{"title":"Proposal for a Comprehensive (Crypto) Asset Taxonomy","authors":"Thomas Ankenbrand, Denis Bieri, Roland Cortivo, Johannes Hoehener, T. Hardjono","doi":"10.1109/CVCBT50464.2020.00006","DOIUrl":"https://doi.org/10.1109/CVCBT50464.2020.00006","url":null,"abstract":"Developments in the distributed ledger technology have led to new types of assets with a broad range of purposes. Although some classification frameworks for common instruments from traditional finance and some for these new, so-called cryptographic assets already exist and are used, a holistic approach to integrate both worlds is missing. The present paper Our research is part of the FinTech programme supported by Finnova, Inventx, Swiss Bankers Prepaid Services, and Swisscom. fills this research gap by identifying 14 attributes, each of which is assigned different characteristics, that can be used to classify all types of assets in a structured manner. Our proposed taxonomy, which is an extension of existing classification frameworks, summarises these findings in a morphological box and is tested for practicability by classifying exemplary assets like cash and bitcoin. The final classification framework can help to ensure that the various stakeholders, such as investors or supervisors, have a consistent view of the different types of assets, and in particular of their characteristics, and also helps to establish standardised terminology.","PeriodicalId":162064,"journal":{"name":"2020 Crypto Valley Conference on Blockchain Technology (CVCBT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130183751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Title Page I 第一页

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-06-01 DOI: 10.1109/cvcbt50464.2020.00001

引用次数: 0

Nym Credentials: Privacy-Preserving Decentralized Identity with Blockchains Nym凭据:使用区块链保护隐私的分散身份

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-06-01 DOI: 10.1109/CVCBT50464.2020.00010

H. Halpin

引用次数: 13

Autonomous Economic Agents as a Second Layer Technology for Blockchains: Framework Introduction and Use-Case Demonstration 自主经济主体作为区块链的第二层技术:框架介绍和用例演示

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-06-01 DOI: 10.1109/CVCBT50464.2020.00007

David E. N. Minarsch, Seyed Ali Hosseini, Marco Favorito, Jonathan Ward

引用次数: 8

Transaction Pricing for Maximizing Throughput in a Sharded Blockchain Ledger 在分片区块链分类账中最大化吞吐量的交易定价

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-06-01 DOI: 10.1109/CVCBT50464.2020.00008.

James R. Riehl, Jonathan Ward

引用次数: 5

Prism Removes Consensus Bottleneck for Smart Contracts Prism消除了智能合约的共识瓶颈

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-04-19 DOI: 10.1109/CVCBT50464.2020.00011

Gerui Wang, Shuo Wang, V. Bagaria, David Tse, P. Viswanath

引用次数: 12

The Decentralized Financial Crisis 分散的金融危机

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2020-02-19 DOI: 10.1109/CVCBT50464.2020.00005

L. Gudgeon, Daniel Perez, D. Harz, B. Livshits, Arthur Gervais

{"title":"The Decentralized Financial Crisis","authors":"L. Gudgeon, Daniel Perez, D. Harz, B. Livshits, Arthur Gervais","doi":"10.1109/CVCBT50464.2020.00005","DOIUrl":"https://doi.org/10.1109/CVCBT50464.2020.00005","url":null,"abstract":"The Global Financial Crisis of 2008, caused by the accumulation of excessive financial risk, inspired Satoshi Nakamoto to create Bitcoin. Now, more than ten years later, Decentralized Finance (DeFi), a peer-to-peer financial paradigm which leverages blockchain-based smart contracts to ensure its integrity and security, contains over 702m USD of capital as of April 15th, 2020. As this ecosystem develops, it is at risk of the very sort of financial meltdown it is supposed to be preventing. In this paper we explore how design weaknesses and price fluctuations in DeFi protocols could lead to a DeFi crisis. We focus on DeFi lending protocols as they currently constitute most of the DeFi ecosystem with a 76% market share by capital as of April 15th, 2020. First, we demonstrate the feasibility of attacking Maker's governance design to take full control of the protocol, the largest DeFi protocol by market share, which would have allowed the theft of 0.5bn USD of collateral and the minting of an unlimited supply of DAI tokens. In doing so, we present a novel strategy utilizing so-called flash loans that would have in principle allowed the execution of the governance attack in just two transactions and without the need to lock any assets. Approximately two weeks after we disclosed the attack details, Maker modified the governance parameters mitigating the attack vectors. Second, we turn to a central component of financial risk in DeFi lending protocols. Inspired by stress-testing as performed by central banks, we develop a stress-testing framework for a stylized DeFi lending protocol, focusing our attention on the impact of a drying-up of liquidity on protocol solvency. Based on our parameters, we find that with sufficiently illiquidity a lending protocol with a total debt of 400m USD could become undercollateralized within 19 days.","PeriodicalId":162064,"journal":{"name":"2020 Crypto Valley Conference on Blockchain Technology (CVCBT)","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121134025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 76

Title Page III 第三页

2020 Crypto Valley Conference on Blockchain Technology (CVCBT) Pub Date : 2018-08-01 DOI: 10.1109/seaa.2018.00002

引用次数: 0