id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-223669-hs5pfg4b	Song, Jinyue	Blockchain Meets COVID-19: A Framework for Contact Information Sharing and Risk Notification System	2020-07-20		.txt	text/plain	8287	432	57	The proposed system unifies location-based and Bluetooth-based contact tracing services into the Blockchain platform, where the automatically executed smart contracts are deployed so that users can get consistent and non-tamperable virus trails. This system implements the following main functions with smart contracts and Bluetooth embedded: (1) Users can record their visited location information and personal contact history to the blockchain database. • We propose an optimal equation for the operating costs of the system, simulate person-to-person contact and user check-in activities in our system, and evaluate the system performance based on the different quantity of users and smart contracts. In our system, three main technologies guarantee data security and personal privacy: decentralized database in the blockchain, automatic execution of smart contracts, and randomization of Bluetooth mac addresses. In our system, the blockchain database will store all transactions in the network, including users' Bluetooth contact records, check-in information of the visited locations, and the change of the user's public health status.	./cache/cord-223669-hs5pfg4b.txt	./txt/cord-223669-hs5pfg4b.txt