scholarly journals A Cost Analysis of Internet of Things Sensor Data Storage on Blockchain via Smart Contracts

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 244
Author(s):  
Yeşem Kurt Peker ◽  
Xavier Rodriguez ◽  
James Ericsson ◽  
Suk Jin Lee ◽  
Alfredo J. Perez
Keyword(s):  
Internet Of Things ◽  
Data Storage ◽  
Simulated Data ◽  
Sensor Data ◽  
Second Phase ◽  
Smart Contracts ◽  
Smart Contract ◽  
Reliable Solution ◽  
The Cost ◽  
Existing Data

Blockchain is a developing technology that can be utilized for secure data storage and sharing. In this work, we examine the cost of Blockchain-based data storage for constrained Internet of Things (IoT) devices. We had two phases in the study. In the first phase, we stored data retrieved from a temperature/humidity sensor connected to an Ethereum testnet blockchain using smart contracts in two different ways: first, appending the new data to the existing data, storing all sensor data; and second, overwriting the new data onto the existing data, storing only a recent portion of the data. In the second phase, we stored simulated data from several sensors on the blockchain assuming sensor data is numeric. We proposed a method for encoding the data from the sensors in one variable and compared the costs of storing the data in an array versus storing the encoded data from all sensors in one variable. We also compared the costs of carrying out the encoding within the smart contract versus outside the smart contract. In the first phase, our results indicate that overwriting data points is more cost-efficient than appending them. In the second phase, using the proposed encoding method to store the data from several sensors costs significantly less than storing the data in an array, if the encoding is done outside the smart contract. If the encoding is carried out in the smart contract, the cost is still less than storing the data in an array, however, the difference is not significant. The study shows that even though expensive, for applications where the integrity and transparency of data are crucial, storing IoT sensor data on Ethereum could be a reliable solution.

scholarly journals Secured Insurance Framework Using Blockchain and Smart Contract

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Abid Hassan ◽  
Md. Iftekhar Ali ◽  
Rifat Ahammed ◽  
Mohammad Monirujjaman Khan ◽  
Nawal Alsufyani ◽  
...  
Keyword(s):  
Data Storage ◽  
Consensus Algorithm ◽  
Smart Contracts ◽  
Insurance Policy ◽  
Security Issues ◽  
Insurance Contracts ◽  
Smart Contract ◽  
Transaction Process ◽  
Single Person ◽  
Contract Implementation

Traditional insurance policy settlement is a manual process that is never hassle-free. There are many issues, such as hidden conditions from the insurer or fraud claims by the insured, making the settlement process rough. This process also consumes a significant amount of time that makes the process very inefficient. This whole scenario can be disrupted by the implementation of blockchain and smart contracts in insurance. Blockchain and innovative contract technology can provide immutable data storage, security, transparency, authenticity, and security while any transaction process is triggered. With the implementation of blockchain, the whole insurance process, from authentication to claim settlement, can be done with more transparency and security. A blockchain is a virtual chain of data blocks that is a decentralized technology. Any transaction or change in the blocks is done after the decentralized validator entity, not a single person. The smart contract is a unique facility stored on the blockchain that gets executed when the predetermined conditions are met. This paper presents a framework where smart contracts are used for insurance contracts and stored on blockchain. In the case of a claim, if all the predetermined conditions are met, the transaction happens; otherwise, it is discarded. The conditions are immutable. That means there is scope for alteration from either side. This blockchain and intelligent contract-based framework are hosted on a private Ethereum network. The Solidity programming language is used to create smart contracts. The framework uses the Proof of Authority (PoA) consensus algorithm to validate the transactions. In the case of any faulty transaction request, the consensus algorithm acts according to and cancels the claim. With blockchain and smart contract implementation, this framework can solve all the trust and security issues that rely on a standard insurance policy.

scholarly journals Blockchain-based Solution for COVID-19 Digital Medical Passports and Immunity Certificates

2021 ◽  
Author(s):  
Haya R. Hasan ◽  
Khaled Salah ◽  
Raja Jayaraman ◽  
Junaid Arshad ◽  
Ibrar Yaqoob ◽  
...  
Keyword(s):  
Security Analysis ◽  
File Systems ◽  
Smart Contracts ◽  
Design Development ◽  
False Information ◽  
Effective Response ◽  
Smart Contract ◽  
Medical Facilities ◽  
The World ◽  
The Cost

COVID-19 has emerged as a highly contagious disease which has caused a devastating impact across the world with a very large number of infections and deaths. Timely and accurate testing is paramount to an effective response to this pandemic as it helps identify infections and therefore mitigate (isolate/cure) them. In this paper, we investigate this challenge and contribute by presenting a blockchain-based solution that incorporates self-sovereign identity, re-encryption proxies, and decentralized storage, such as the interplanetary file systems (IPFS). Our solution implements digital medical passports (DMP) and immunity certificates for COVID-19 test-takers. We present smart contracts based on the Ethereum blockchain written and tested successfully to maintain a digital medical identity for test-takers that help in a prompt trusted response directly by the relevant medical authorities. We reduce the response time of the medical facilities, alleviate the spread of false information by using immutable trusted blockchain, and curb the spread of the disease through DMP. We present a detailed description of the system design, development, and evaluation (cost and security analysis) for the proposed solution. Since our code leverages the use of the on-chain events, the cost of our design is almost negligible. We have made our smart contract codes publicly available on Github.

scholarly journals Rational Protocols and Attacks in Blockchain System

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Tao Li ◽  
Yuling Chen ◽  
Yanli Wang ◽  
Yilei Wang ◽  
Minghao Zhao ◽  
...  
Keyword(s):  
Game Theory ◽  
Internet Of Things ◽  
Building Blocks ◽  
Emerging Technology ◽  
Economic Incentives ◽  
Research Progress ◽  
Smart Contracts ◽  
Future Directions ◽  
Smart Contract ◽  
Game Theoretic

Blockchain has been an emerging technology, which comprises lots of fields such as distributed systems and Internet of Things (IoT). As is well known, blockchain is the underlying technology of bitcoin, whose initial motivation is derived from economic incentives. Therefore, lots of components of blockchain (e.g., consensus mechanism) can be constructed toward the view of game theory. In this paper, we highlight the combination of game theory and blockchain, including rational smart contracts, game theoretic attacks, and rational mining strategies. When put differently, the rational parties, who manage to maximize their utilities, involved in blockchain chose their strategies according to the economic incentives. Consequently, we focus on the influence of rational parties with respect to building blocks. More specifically, we investigate the research progress from the aspects of smart contract, rational attacks, and consensus mechanism, respectively. Finally, we present some future directions based on the brief survey with respect to game theory and blockchain.

scholarly journals Blockchain-based Solution for COVID-19 Digital Medical Passports and Immunity Certificates

2020 ◽  
Author(s):  
Haya R. Hasan ◽  
Khaled Salah ◽  
Raja Jayaraman ◽  
Junaid Arshad ◽  
Ibrar Yaqoob ◽  
...  
Keyword(s):  
Security Analysis ◽  
File Systems ◽  
Smart Contracts ◽  
Design Development ◽  
False Information ◽  
Effective Response ◽  
Smart Contract ◽  
Medical Facilities ◽  
The World ◽  
The Cost

COVID-19 has emerged as a highly contagious disease which has caused a devastating impact across the world with a very large number of infections and deaths. Timely and accurate testing is paramount to an effective response to this pandemic as it helps identify infections and therefore mitigate (isolate/cure) them. In this paper, we investigate this challenge and contribute by presenting a blockchain-based solution that incorporates self-sovereign identity, re-encryption proxies, and decentralized storage, such as the interplanetary file systems (IPFS). Our solution implements digital medical passports (DMP) and immunity certificates for COVID-19 test-takers. We present smart contracts based on the Ethereum blockchain written and tested successfully to maintain a digital medical identity for test-takers that help in a prompt trusted response directly by the relevant medical authorities. We reduce the response time of the medical facilities, alleviate the spread of false information by using immutable trusted blockchain, and curb the spread of the disease through DMP. We present a detailed description of the system design, development, and evaluation (cost and security analysis) for the proposed solution. Since our code leverages the use of the on-chain events, the cost of our design is almost negligible. We have made our smart contract codes publicly available on Github.

scholarly journals Blockchain technology for accounting and distribution of contributions from a charitable foundation

2021 ◽  
Vol 5 (2(61)) ◽  
pp. 9-14
Author(s):  
Oksana Herasymenko ◽  
Valeriia Bachynska
Keyword(s):  
Web Application ◽  
Web Applications ◽  
Smart Contracts ◽  
Joint Work ◽  
Non Profit ◽  
Software Application ◽  
Blockchain Technology ◽  
Smart Contract ◽  
Seeking Help ◽  
The Cost

The object of research is software for financial accounting and distribution of funds in a non-profit charitable foundation using smart contracts of the Ethereum platform. The work is aimed at designing and implementing a software application for a charitable foundation, which allows to exclude the misuse of funds of a non-profit charitable foundation. The paper proposes an implementation of the Ethereum smart contract for the software of a charitable foundation. In the app, users can apply for financial aid or make a charitable donation. The request for financial support is confirmed by administrators to avoid abuse by those seeking help. Anyone who has a crypto wallet can become a sponsor by transferring funds from its account to a selected request. The sponsor remains incognito when making a charitable contribution. After collecting the entire declared amount, the funds are automatically transferred to the crypto wallet of the request’s owner. A smart contract and a corresponding decentralized web application for interacting with it were experimentally deployed, and their joint work was tested. To implement the smart contract, the Solidity programming language was chosen; developed smart contract converted to bytecode using remix. The resulting bytecode is ready to be deployed on the Ethereum platform. Decentralized web application for interacting with the contract is implemented using Web3.js, Vue.js. A rough estimate of the cost of deploying a project on the Ethereum platform has been made. The deployment and operation of smart contracts and web applications comes with a certain overhead, which is most dependent on the cost of ether. However, this is a justified price to pay for the transparency of transactions and the shadowing of the turnover of funds of the charitable foundation. The results of the research can be used as a basis for further transformation into full-fledged software with the ability to submit all reporting documents to the relevant government agencies and sponsors.

scholarly journals IoT-Based Autonomous Pay-As-You-Go Payment System with the Contract Wallet

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shinya Haga ◽  
Kazumasa Omote
Keyword(s):  
Internet Of Things ◽  
Payment System ◽  
Smart Contracts ◽  
Proof Of Concept ◽  
Private Key ◽  
Iot Devices ◽  
The Cost

In recent years, increasingly many companies have entered the pay-as-you-go business because it has become easier to monitor services constantly due to the development and increase in the number of Internet of Things (IoT) devices. Research is in progress to introduce cryptographic assets into the payment, but if a private key is stolen, the cryptographic assets associated with it can be stolen. To address this issue, this paper proposes a secure automated payment system using contract wallets. This method ensures the security of cryptographic assets even if the private key is stolen. Secure automated payments are enabled by issuing transactions from IoT devices and using internal transactions to link contract wallets and smart contracts that handle the payment of cryptographic assets. Furthermore, the effectiveness of the proposed system is demonstrated on the Ethereum blockchain as a proof of concept, and the cost of gas is measured.

scholarly journals Using Ethereum blockchain to store and query pharmacogenomics data via smart contracts

2019 ◽  
Author(s):  
Gamze Gürsoy ◽  
Charlotte M Brannon ◽  
Mark Gerstein
Keyword(s):  
Drug Interaction ◽  
Data Storage ◽  
Query Time ◽  
Smart Contracts ◽  
Interaction Data ◽  
Time And Space ◽  
Disk Space ◽  
Smart Contract ◽  
Wide Range ◽  
Linear Query

AbstractBackgroundWith the advent of precision medicine, pharmacogenomics data is becoming increasingly critical to patient care. These data describe the relationship between a particular variant in the genome and the response to a drug by the patient. As utilizing this kind of data becomes more integral to medical treatment decisions, appropriate storage and sharing of this data will be critical. A potential way of securely storing and sharing pharmacogenomics data is a smart contract with the Ethereum blockchain. This is an open-source blockchain platform for decentralized applications. A transaction-based, state machine, the “world” of Ethereum maintains user accounts and storage in a network state. Immutable pieces of code called “smart contracts” may be deployed to the Ethereum network and run on the Ethereum Virtual Machine when called by a user or other contract. The 2019 iDASH (Integrating Data for Analysis, Anonymization, and Sharing) competition for Secure Genome Analysis challenged participants to develop time- and space-efficient smart contracts to log and query gene-drug relationship data on the Ethereum blockchain.MethodsWe designed a smart contract to store and query pharmacogenomics data (gene-drug interaction data) in Ethereum using an index-based, multi-mapping approach allowing for time and space efficient storage and query. Our solution to the IDASH competition ranked in the top three at a workshop held in Bloomington, IN in October 2019. Although our solution performed well in the challenge, we wanted to improve its scalability and query efficiency. To that end, we developed an alternate “fastQuery” solution that stores pooled rather than raw data, allowing for significantly improved query time for 0-AND queries, and constant query time for 1- and 2-AND queries.ResultsWe tested the performance of both of our solutions in Truffle (v5.0.31) using datasets ranging from 100 to 1000 entries, and inserting data at 25, 50, 100, and 200 observations at a time. On a private, proof-of-authority test network, our challenge solution requires approximately 70 seconds, 500 MB of memory, and 80 MB of disk space to insert 1000 entries (200 at a time); and 400 ms and 5 MB of memory to query a two-AND query from 1000 entries. This solution exhibits constant memory for insertion and querying, and linear query time. Our alternate fastQuery solution requires approximately 60 seconds, 500 MB of memory, and 80 MB of disk space to insert 1000 entries (200 at a time); and 83 ms and 5 MB of memory to query a two-AND query from 1000 entries. This solution exhibits constant memory for insertion and querying, linear query time for 0-AND queries, and constant query time for 1- and 2-AND queries in a database of up to 1000 entries.ConclusionIn this study we showed that pharmacogenomics data can be stored and queried efficiently on the Ethereum blockchain. Our approach has the potential to be useful for a wide range of datasets in biomedical research; while we focused on gene-drug interaction data, our solution designs could be used to store a range of clinical trial data. Moreover, our solutions could be adapted to store and query data in any field where high-integrity data storage and efficient access is required.

scholarly journals Automated Payment and Contract Management in the Construction Industry by Integrating Building Information Modeling and Blockchain-Based Smart Contracts

2021 ◽  
Vol 11 (16) ◽  
pp. 7653
Author(s):  
Katharina Sigalov ◽  
Xuling Ye ◽  
Markus König ◽  
Philipp Hagedorn ◽  
Florian Blum ◽  
...  
Keyword(s):  
Construction Industry ◽  
Data Storage ◽  
Construction Projects ◽  
Data Exchange ◽  
Building Information Modeling ◽  
Information Modeling ◽  
Contract Management ◽  
Smart Contracts ◽  
Smart Contract ◽  
Building Information

Construction projects usually involve signing various contracts with specific billing procedures. In practice, dealing with complex contract structures causes significant problems, especially with regard to timely payment and guaranteed cash flow. Furthermore, a lack of transparency leads to a loss of trust. As a result, late or non-payment is a common problem in the construction industry. This paper presents the concept of implementing smart contracts for automated, transparent, and traceable payment processing for construction projects. Automated billing is achieved by combining Building Information Modeling (BIM) approaches with blockchain-based smart contracts. Thereby, parts of traditional construction contracts are transferred to a smart contract. The smart contract is set up using digital BIM-based tender documents and contains all of the relevant data for financial transactions. Once the contracted construction work has been accepted by the client, payments can be made automatically via authorized financial institutions. This paper describes the framework, referred to as BIMcontracts, the container-based data exchange, and the digital contract management workflow. It discusses the industry-specific requirements for blockchain and data storage and explains which technical and software architectural decisions were made. A case study is used to demonstrate the current implementation of the concept.

scholarly journals A self-sovereign identity management scheme using smart contracts

2021 ◽  
Vol 336 ◽  
pp. 08005
Author(s):  
Jianlin Niu ◽  
Zhiyu Ren
Keyword(s):  
Data Storage ◽  
Programming Language ◽  
Identity Management ◽  
Smart Contracts ◽  
Security Risks ◽  
Storage Method ◽  
Cross Domain ◽  
Smart Contract ◽  
Management Scheme ◽  
Management Schemes

The existing self-sovereign identity management schemes have some problems, such as weak availability and security risks. To solve these problems, we proposed a cross-domain self-sovereign identity management scheme using smart contracts. This scheme takes into account the entire lifecycle of identity, especially including the cross-domain use and recovery. To preserve the privacy data of users on the blockchain, we proposed a data storage method of anchoring on blockchain. Finally, we implemented this scheme using the Solidity programming language for smart contract. This scheme has been experimentally verified to be capable of maintaining the expenditure of resources under control and having good usability. Compared with other self-sovereign identity management schemes, this scheme has better performance in terms of controllability, security and portability.

scholarly journals Blockchain-based Solution for COVID-19 Digital Medical Passports and Immunity Certificates

2020 ◽  
Author(s):  
Haya R. Hasan ◽  
Khaled Salah ◽  
Raja Jayaraman ◽  
Junaid Arshad ◽  
Ibrar Yaqoob ◽  
...  
Keyword(s):  
Security Analysis ◽  
File Systems ◽  
Smart Contracts ◽  
Design Development ◽  
False Information ◽  
Effective Response ◽  
Smart Contract ◽  
Medical Facilities ◽  
The World ◽  
The Cost

COVID-19 has emerged as a highly contagious disease which has caused a devastating impact across the world with a very large number of infections and deaths. Timely and accurate testing is paramount to an effective response to this pandemic as it helps identify infections and therefore mitigate (isolate/cure) them. In this paper, we investigate this challenge and contribute by presenting a blockchain-based solution that incorporates self-sovereign identity, re-encryption proxies, and decentralized storage, such as the interplanetary file systems (IPFS). Our solution implements digital medical passports (DMP) and immunity certificates for COVID-19 test-takers. We present smart contracts based on the Ethereum blockchain written and tested successfully to maintain a digital medical identity for test-takers that help in a prompt trusted response directly by the relevant medical authorities. We reduce the response time of the medical facilities, alleviate the spread of false information by using immutable trusted blockchain, and curb the spread of the disease through DMP. We present a detailed description of the system design, development, and evaluation (cost and security analysis) for the proposed solution. Since our code leverages the use of the on-chain events, the cost of our design is almost negligible. We have made our smart contract codes publicly available on Github.

Sign in / Sign up

Export Citation Format

Share Document