2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON)最新文献_第3页

Message from Program Chairs 节目主持人的信息

2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON) Pub Date : 2019-04-01 DOI: 10.1109/dappcon.2019.00006

引用次数: 0

Publisher's Information 出版商的信息

2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON) Pub Date : 2019-04-01 DOI: 10.1109/dappcon.2019.00036

引用次数: 0

Proof-of-Learning: A Blockchain Consensus Mechanism Based on Machine Learning Competitions 学习证明:基于机器学习竞赛的区块链共识机制

2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON) Pub Date : 2019-04-01 DOI: 10.1109/DAPPCON.2019.00023

Felipe Bravo-Marquez, S. Reeves, M. Ugarte

引用次数: 51

Leveraging Standards Based Ontological Concepts in Distributed Ledgers: A Healthcare Smart Contract Example 在分布式账本中利用基于标准的本体论概念:医疗保健智能合约示例

2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON) Pub Date : 2019-04-01 DOI: 10.1109/DAPPCON.2019.00029

Mengyi Li, Lirong Xia, O. Seneviratne

引用次数: 10

An Alternative Paradigm for Developing and Pricing Storage on Smart Contract Platforms 在智能合约平台上开发和定价存储的另一种范式

2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON) Pub Date : 2019-02-03 DOI: 10.1109/DAPPCON.2019.00032

Christos Patsonakis, M. Roussopoulos

{"title":"An Alternative Paradigm for Developing and Pricing Storage on Smart Contract Platforms","authors":"Christos Patsonakis, M. Roussopoulos","doi":"10.1109/DAPPCON.2019.00032","DOIUrl":"https://doi.org/10.1109/DAPPCON.2019.00032","url":null,"abstract":"Smart contract platforms, the most notable of which is probably Ethereum, facilitate the development of important and diverse distributed applications (e.g., naming services and fungible tokens) in a simple manner. This simplicity stems from the inherent utility of employing the state of smart contracts to store, query and verify the validity of application data. In Ethereum, data storage incurs an underpriced, non-recurring, predefined fee. Furthermore, as there is no incentive for freeing or minimizing the state of smart contracts, Ethereum is faced with a tragedy of the commons problem with regards to its monotonically increasing state. This issue, if left unchecked, may lead to centralization and directly impact Ethereum's security and longevity. In this work, we introduce an alternative paradigm for developing smart contracts in which their state is of constant size and facilitates the verification of application data that are stored to and queried from an external, potentially unreliable, storage network. This approach is relevant for a wide range of applications, such as any key-value store. We evaluate our approach by adapting the most widely deployed standard for fungible tokens, i.e., the ERC20 token standard. We show that Ethereum's current cost model penalizes our approach, even though it minimizes the overhead to Ethereum's state and aligns well with Ethereum's future. We address Ethereum's monotonically increasing state in a two-fold manner. First, we introduce recurring fees that are proportional to the state of smart contracts and adjustable by the miners that maintain the network. Second, we propose a scheme where the cost of storage-related operations reflects the effort that miners have to expend to execute them. Lastly, we show that under such a pricing scheme that encourages economy in the state consumed by smart contracts, our ERC20 token adaptation reduces the incurred transaction fees by up to an order of magnitude.","PeriodicalId":434018,"journal":{"name":"2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130649062","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: 3

On the Practicality of a Smart Contract PKI 论智能合约PKI的实用性

2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON) Pub Date : 2019-02-03 DOI: 10.1109/DAPPCON.2019.00022

Christos Patsonakis, Katerina Samari, A. Kiayias, M. Roussopoulos

{"title":"On the Practicality of a Smart Contract PKI","authors":"Christos Patsonakis, Katerina Samari, A. Kiayias, M. Roussopoulos","doi":"10.1109/DAPPCON.2019.00022","DOIUrl":"https://doi.org/10.1109/DAPPCON.2019.00022","url":null,"abstract":"Public key infrastructures (PKIs) are one of the main building blocks for securing communications over the Internet. Currently, PKIs are under the control of centralized authorities, which is problematic as evidenced by numerous incidents where they have been compromised. The distributed, fault tolerant log of transactions provided by blockchains and more recently, smart contract platforms, constitutes a powerful tool for the decentralization of PKIs. To verify the validity of identity records, blockchain-based identity systems store on chain either all identity records, or, a small (or even constant) sized amount of data for verifying identity records stored off chain. However, as most of these systems have never been implemented, there is little information regarding the practical implications of each design's tradeoffs. In this work, we first implement and evaluate the only provably secure, smart contract based PKI of Patsonakis et al. on top of Ethereum. This construction incurs constant-sized storage at the expense of computational complexity. To explore this tradeoff, we propose and implement a second construction which, eliminates the need for trusted setup, preserves the security properties of Patsonakis et al. and, as illustrated through our evaluation, is the only version with constant-sized state that can be deployed on the live chain of Ethereum. Furthermore, we compare these two systems with the simple approach of most prior works, e.g., the Ethereum Name Service, where all identity records are stored on the smart contract's state, to illustrate several shortcomings of Ethereum and its cost model. We propose several modifications for fine tuning the model, which would be useful to be considered for any smart contract platform like Ethereum so that it reaches its full potential to support arbitrary distributed applications.","PeriodicalId":434018,"journal":{"name":"2019 IEEE International Conference on Decentralized Applications and Infrastructures (DAPPCON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123696359","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: 14