Million Ether Homepage

Storing Colors in a Pixel Grid

Million Ether Page Essential Smart Contract

Tip: Mining only when there are transactions

Tip: Using Remix IDE

Getting Started

Getting The Pixels and Ethereum Events

Building a DApp UI

Drawing in HTML Canvas

Using Websockets with Web3

We don't need the checkBalance function anymore, so let's get rid of it.

Web3 and Events Over WebSockets

Drawing Pixels from the Blockchain

Viewing Pixels

The rest of the script can be found in `scripts/buy-pixels-001-read.js` below

Buying An Image -- Reading Pixels

Buying An Image -- Sending Transactions

Pixel bidding and structs

Payable Contracts, payable Functions

Contract Owner and require

Payable color pixel function

Buying Pixels

Sending funds from a contract

The safer way to send funds from a contract

Also note that any sort of math like this _should_ be checking for overflows, which we'll talk about later.

The Pull Payment Pattern - Withdraw payments when outbid

Million Ether Homepage Summary

Auctioning Pixels

solidity

In this course, we'll build a DApp inspired by [The Million Dollar Homepage](https://en.wikipedia.org/wiki/The_Million_Dollar_Homepage). We'll build a 1 million pixel page, and each pixel can be colored by placing the highest bid.

In this course we'll walk through every step of writing a smart contract, deploying it, hosting auctions, and connecting it to the browser through web3. 

If you're looking to build real, full-stack ethereum Dapps, then this is a perfectly-sized example.

We'll build a DApp inspired by the Million Dollar Homepage, powered by an auction on the Ethereum blockchain

Learn

The newline Guide to Building Your First GraphQL Server with Node and TypeScript

Teach

Amelia Wattenberger

Author of Fullstack D3

Community

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Fullstack React with TypeScript