Beginning Ethereum Smart Contracts Programming: With Examples in Python, Solidity, and JavaScript

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2023

W.-M. LeeBeginning Ethereum Smart Contracts Programminghttps://doi.org/10.1007/978-1-4842-9271-6_10

10. Project: Online Lottery

Wei-Meng Lee¹  

(1)

Ang Mo Kio, Singapore

 

Now that you have seen how smart contracts work and how to interact with them using the web3.js APIs, it’s a good time to explore an application from end to end, from the smart contract to the front end, and perhaps give you some ideas for building your own decentralized applications.

How the Lottery Game Works

For this chapter, you will build a lottery game using a smart contract. In this contract, you will allow players to place a bet on a number. Figure 10-1 shows how the game works.

A schematic ...