# Interacting with the Internet of Things using Smart Contracts and Blockchain Technologies

## TL;DR

This paper presents a secure, decentralized method using Ethereum smart contracts for end-users to interact with resource-constrained IoT devices, addressing access, authentication, and payments.

## Contribution

It introduces a novel blockchain-based framework tailored for IoT devices with limited resources, enabling secure interactions within the constraints of blockchain technology.

## Key findings

- Prototype implementation demonstrates feasibility
- Secure access control and authentication achieved
- Decentralized payments integrated successfully

## Abstract

Despite technological advances, most smart objects in the Internet of Things (IoT) cannot be accessed using technologies designed and developed for interacting with powerful Internet servers. IoT use cases involve devices that not only have limited resources, but also they are not always connected to the Internet and are physically exposed to tampering. In this paper, we describe the design, development, and evaluation of a smart contract-based solution that allows end-users to securely interact with smart devices. Our approach enables access control, Thing authentication, and payments in a fully decentralized setting, taking at the same time into consideration the limitations and constraints imposed by both blockchain technologies and the IoT paradigm. Our prototype implementation is based on existing technologies, i.e., Ethereum smart contracts, which makes it realistic and fundamentally secure.