YouTube Video https://youtu.be/zmFU54Apyn8 Speaker John Gethoefer | Principal Software Engineer | Bumped, Inc. Abstract Get started with Smart Contracts and the Solidity™ language. In this presentation, you'll receive an introduction to Solidity, a programming language for creating smart contracts for Ethereum and Hedera Hashgraph. You will learn step-by-step procedures to creating a simple smart contract and explore best practices for testing and developing distributed applications (Dapps).

1. John Gethoefer
Principal Software Engineer

2. Smart Contracts
From Zero to Dapp Hero

3. What is a
Smart Contract?

4. Smart Contracts are…
• Contracts! (binding agreements)
• Self-executing
• Enforced by computation (machine code)
• Recorded on blockchain (EVM, Hedera!)
• Building blocks for Dapps

5. What are Dapps?

6. Dapps are…
• "De-centralized" Applications
• Open Source
• End-to-End application
• Bound to blockchain by Smart Contracts
• Web 3.0 ???

7. Web 1.0 Apps
Database
Server
(Application)
Browser

8. Web 2.0 Apps
Database
Server
(API)
Browser
(Application)

9. Web 3.0 Apps
Blockchain
Smart
Contracts
Browser
(Application)

10. Dapp Components
• Blockchain or HashGraph
• "On-chain" data (Smart Contracts - Solidity)
• "Off-chain" data (IPFS, Swarm)
• Client Application (React.js, Angular.js)
• Protocol bridge (Web3.js, Whisper)

11. Solidity
• Open Source
• Curly-braced programming language {}
• Basis for smart contracts
• Compiles to "Assembly" code
• Runs on EVM, Hedera

13. Tools for Solidity
• Remix IDE
• Truffle
• Embark
• OpenZeppelin
• Web3.js

14. Remix IDE
• Browser-based Application
• http://remix.ethereum.org
• Solidity Language Support
• Write, Compile, Run, Test, Analyze
• Basic smart contract editing
• Great tool for learning Solidity

15. Truffle
• Command-line client
• npm install -g truffle
• unit testing, migration, deployment
• Includes useful project templates (boxes)
• More advanced tool than Remix IDE

16. Truffle React Dapp

17. Embark
• Similar to Truffle (more e2e)
• npm install -g embark
• testing, code generation
• Likely easier than Truffle for beginners

18. Embark Angular Dapp

19. OpenZeppelin
• Smart Contract Library
• Reusable Solidity contracts as building blocks
• Open Source
• Use with Truffle or Embark
• Access Control, Crowdsales, Tokens, etc

20. Your own ERC20

21. Web3.js
• JavaScript web library
• JSON RPC
• Bridges web applications with smart contracts
• Can be used with React.js or Angular.js

22. Questions?
John Gethoefer
john@gethoefer.com