Blockchain for Teens by Brian Wu & Bridget Wu

Author:Brian Wu & Bridget Wu
Language: eng
Format: epub
ISBN: 9781484288085
Publisher: Apress

Congratulations! You have successfully written your very first Hello World smart contract in Solidity and deployed it to the blockchain. To learn more about Solidity, you can visit the Solidity Official Documentation (https://docs.soliditylang.org/en/v0.8.15/contracts.xhtml).

Taking Control of Your First Ethereum Wallet

In Remix, when we use Injected Provider, Metamask is one of the most widely used wallet providers. MetaMask was founded in 2016 by Aaron Davis and Daniel Finlay and is currently owned by ConsenSys. As of March 2022, Metamask has over 30 million monthly active users. As a free browser extension for Chrome, Firefox, Brave, and Edge, MetaMask allows your regular browser to behave as a web3 browser for storing and exchanging cryptocurrencies, as well as interacting with Ethereum Dapps without running an Ethereum node. Simply put, MetaMask is a mobile crypto wallet you can access in your browser. To manage Metamask access, the user needs only a password and a 12-word recovery phrase, also known as a seed phrase. The seed phrase can be made up of any real words, such as dog, cat, or chicken.

If you forget or lose wallet recovery phrase, there is no way to recover your crypto wallet password. It is very important that you back up these seed phrase in a safe and secure place, maybe a hard disk, USB drive, or paper. Don’t store it where it’ll be vulnerable, like an email, online storage, etc.

MetaMask may not be the best place to store large amounts of crypto or valuable crypto assets, such as NFTs. When connecting to the mainnet for trading, use MetaMask as the only tab in that browser and avoid connecting to social media accounts in the same browser—some social media sites have plugins that can steal your data.

Install MetaMask from https://metamask.io. Then download the MetaMask wallet software onto your chosen browser. Select the “Create a Wallet” option, read the terms and conditions, and create a password. Once installed, you will see a fox on the top right of your browser. Open MetaMask, enable the test network, or testnet, by clicking Settings➤ Advanced ➤ Show test networks and select on button for “Select this to show test networks in network list.” Transactions on a testnet are meant to only simulate mainnet transactions, or real blockchain transactions.

Figure 5-15Update Metamask setting for testnet

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