Ethereum-based Emergency Service for Smart Home System: Smart Contract Implementation

摘要

Emergency service call for public service providers has become an important role for smart home applications in order to support safety and security in the household building. Blockchain has been a promising solution with cryptography and incentive distributed mechanisms to support the verification, execution and recording of transactions between untrusted parties. In this paper, we present a Smart Home System (SHS) based on Ethereum with smart contract infrastructure for handling an emergency service sending from SHS to Home Service Providers (HSP) when there are unusual environmental conditions. Our SHS testbed consists of three domains: (1) Smart Home Sensor Manager (SM) or IoT devices to gather environmental sensor data and send an emergency call to HSP, (2) Home Service Provider (HSP) system deployed with Ethereum Virtual Machine (EVM) and smart contract, and (3) decentralize Meteor framework to interface between Ethereum and web based applications for homeowners (HO) and HSP staffs. To achieve homeowner privacy and security, we enable digital signature coupling with InterPlanetary File System (IPFS) for handling the emergency call from SM to HSP and One Time Passcode (OTP) produced by HSP for HSP staffs to verify themselves for further access control when they go to service homeowner's house. Each smart contract transaction in solidity is described. Finally, security and privacy issues for our proposed work are discussed.