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Building Ethereum powered DApps Arpit Mathur @arpit

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@arpit Quick Poll ● Software/Web Developers? ○ JavaScript? ■ React? ○ Rails?

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@arpit Traditional App Stack

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@arpit Decentralized App Stack

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@arpit Communicating with the Network ● JSON RPC ● Web3.js ● Injected Web3.js ● Web dev framework (Truffle)

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@arpit Ganache / Ganache CLI

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@arpit Truffle ● “Rails for Ethereum Dapps” ● “Truffle Boxes”: Preconfigured projects http://truffleframework.com/

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@arpit Remix IDE

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@arpit Metamask ● Ethereum Wallet ● Chrome Extension ● Injects configured Web3.js into your page

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@arpit A Simple Contract

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@arpit Workflow ● Create Contract in Solidity ● Move Contracts to /contracts directory ● Compile contract: ○ `truffle compile` ● Run Ganache (local test net) ● Deploy Contracts ○ `truffle migrate` ● Import Contract JavaScript stub in your clientside code ○ import MyContract from '../../../build/contracts/MyContract.json' ● Execute functions on Contract in JavaScript (at the right address)

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@arpit Profit?

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@arpit Links and such! ● http://truffleframework.com ● https://solidity.readthedocs.io ● https://metamask.io/