Programming Smart Contracts in Ethereum Blockchain Workshop at SIGCSE 2019

Explore the Programming Smart Contracts in Ethereum Blockchain Workshop held at SIGCSE 2019, covering topics like cryptocurrencies, Ethereum basics, smart contracts development using Solidity, and distributed applications. The workshop agenda includes modules on Bitcoin, Ethereum, cryptography, wallets, transactions, and hands-on lab sessions for creating simple smart contracts. Experts from various educational institutions presented insightful demonstrations and discussions to facilitate learning in blockchain technology and its applications.

• Blockchain Workshop
• Smart Contracts
• Ethereum
• SIGCSE 2019
• Cryptocurrencies

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1. SIGCSE Workshop #108 - Programming Smart Contracts in Ethereum Blockchain using Solidity UH Maui College, HI Debasis Bhattacharya, JD, DBA Mohammad Azhar, PhD CUNY BMCC, NY Mario Canul UH Maui College, HI Saxon Knight UH Maui College, HI Rajiv Malkan Lone Star College, TX Takashi Sugimura, PhD UH Maui College, HI http://maui.hawaii.edu/cybersecurity debasisb@hawaii.edu University of Hawaii Maui College February 27, 2019 Supported by NSF ATE Award # 1700562

2. Agenda Module 1 - Cryptocurrencies Bitcoin Basics, Mining, Consensus, Security (20 minutes) Module 2 - Ethereum and Blockchain Ethereum Basics, Cryptography, Wallets, Transactions (20 minutes) Module 3 - Smart Contracts Smart Contracts and Demo (15 minutes) Break (5 minutes) Lab - Programming a simple Smart Contract using Solidity (90 minutes) Module 4 - Distributed Apps (DApps) Transition to the classroom (30 minutes) Next Steps 2/27/19 SIGCSE 2019 Blockchain Workshop #108 - Module 2 2

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5. Source: https://ubri.ripple.com/faq/ 2/27/19 SIGCSE 2019 Blockchain Workshop #108 - Module 2 5

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14. Demo Hello World Smart Contract on Remix Solidity IDE pragma solidity >= 0.4.22 <0.6.0; contract Mortal{ address owner; constructor() public { owner = msg.sender; } function die() public { if(msg.sender == owner) selfdestruct(msg.sender); } } contract Helloworld is Mortal{ string output = "Hello, World!"; function printHello() public view returns (string memory) { return output; } } 2/27/19 SIGCSE 2019 Blockchain Workshop #108 - Module 2 14

15. Demo Instructions Copy the code and paste into Remix at https://remix.Ethereum.org Since it is the latest compiler, click on Start to compile or (Ctrl-S) Once compiled, click on Run tab In Run, make sure Environment is set to JavaScript VM Click on pink button Deploy under Helloworld A smart contract Helloworld will be deployed in memory Click on Helloworld smartcontract at bottom of screen (at memory location in blockchain) to access its functions die and printHello Click on printHello function to see output 0: string: Hello, World Click on die function to remove smart contract from blockchain 2/27/19 SIGCSE 2019 Blockchain Workshop #108 - Module 2 15

16. References Ethereum Overview and Tutorial Josh Quintal Truffle, 2017 Solidity Tutorial to Smart Contracts Intro to Smart Contracts Installing the Solidity Compiler - Using npm/NodeJS, Docker etc. Code Examples in Solidity Voting, Blind Auction, Safe Purchase etc. Solidity Style Guide Solidity v0.5.4 Ethereum Command Line tools (CLI) Geth and Eth from Ethereum Network Ethereum Greeter Smart Contract Sample tutorial from Ethereum Truffle Suite Download Download the Truffle Software Ganache Suite Download Download the Ganache Software Setting up a Pet Shop Dapp Truffle Tutorial Building React Native Dapps Truffle Tutorial with Drizzle v1.3+ 2/27/19 SIGCSE 2019 Blockchain Workshop #108 - Module 2 16