Web3 Masterclass for JavaScript Developers

Chainlink


Summary

The webinar discussed bridging Web 2 and Web 3, progressing from simple smart contracts to a decentralized news aggregator. Key topics included blockchain's shared ledger system, proof of stake consensus, smart contracts, and oracles for off-chain data. Detailed guidance was provided on setting up Metamask, using test nets, Chainlink tokens, and deploying smart contracts. Insights into blockchain operations, interaction with networks, and CSS skill improvement strategies were also shared. The session concluded with a focus on decentralization, reliable data feeds, GitHub deployment, and audience engagement.


Introduction to Web 3 and Brainstorming App

Introduction to the webinar with Cassidy, CTO of Contenda, discussing Brain Story app and the excitement to learn about Web 3 from Richard, a developer Advocate at Chainlink Labs.

Interactive Webinar on Web 3

Discussion about the importance of bridging the gap between Web 2 and Web 3, plans for an interactive webinar where the audience can participate and follow along with the demos.

Building a Decentralized News Aggregator

Plans to progress from simple hello world smart contracts to building a decentralized news aggregator using Hacker News stories stored on the blockchain.

Discussion on Web 3 Experience

Conversation about experiences in the Web 3 space, challenges, and the availability of test nets and faucets for practice without real financial risk.

Understanding Blockchain

Explanation of blockchain as a shared ledger system where transactions are recorded and agreed upon by all network participants, highlighting the decentralized nature and security aspects.

Testing with Test Nets and Faucets

Discussion on the use of test nets and faucets to practice without financial risk, emphasizing the concept of test net currency as 'Monopoly money' for learning and testing purposes.

Overview of Proof of Work and Proof of Stake

Explanation of proof of work and proof of stake consensus mechanisms, highlighting the energy efficiency and security aspects of proof of stake compared to proof of work.

Incentivizing Nodes with Gas Fees

Explanation of incentivizing nodes with gas fees for processing transactions and the importance of promoting good behavior and efficient practices in blockchain interactions.

Smart Contracts and Oracles

Discussion on smart contracts as programmable agreements on the blockchain and the role of oracles in bringing off-chain data onto the blockchain, ensuring data accuracy and trustworthiness.

Metamask Wallet Setup

Explaining the setup process for Metamask wallet, including creating a new wallet, securing it with a password, understanding public and private key pairs, and the concept of Hardware wallets.

Accessing Monopoly Money

Guidance on accessing and using Monopoly money on the Ethereum test network, changing the network to Sapolia, and using a workshop faucet to obtain funds for testing purposes.

Using Chainlink Tokens

Introduction to using Chainlink tokens, including obtaining ETH and LINK tokens, understanding their role in the Chainlink Oracle Network, and transferring and calling functions with LINK tokens.

Deploying Smart Contracts

Deployment of the first smart contract, explanation of the deployment process using Remix IDE, connecting with MetaMask wallet, and waiting for blockchain confirmation.

Building Advanced Smart Contract

Building a more complex smart contract for fetching data from Hacker News API, discussing the contract structure, data types, and connection with Chainlink functions for API calls.

Setting Up Onchain Operations

The process of setting up onchain operations is explained, including creating a subscription, adding funds, and deploying contracts with detailed steps and explanations.

Understanding the Encryption Type

Discussion on one-way encryption type and using a public key for verification.

Creating a Bucket and Adding Funds

The concept of creating a bucket, deploying a contract, and adding funds to it is elaborated upon, highlighting the interactions onchain during the process.

Defining Consumer's Address

Explanation of setting up the consumer's address, determining the subscription ID, and deploying the consumer contract.

Adding JavaScript Code

Guidance on adding JavaScript code to interact with the blockchain, including structuring the article object and logging actions.

Populating Article Data and Emitting Events

Updating the contract to handle article data, emit events, and secure gas limits for computations.

Understanding Gas Limit and Network Operations

Detailed insights into gas limits, compensating fees, and the role of Oracle Network in transactions on the blockchain.

Designing and Deploying the Frontend

Creating a front-end to display blockchain data, setting up environment variables, and handling data retrieval for user interaction.

Implementing Frontend Styling

Enhancing the front-end interface with CSS styling for a visually appealing display of blockchain data.

Finalizing Frontend Development

Wrap-up of the frontend development process, testing functionality, addressing errors, and ensuring successful data retrieval from the blockchain.

Reviewing Blockchain Operations

Recap of the blockchain operations, discussions on decentralization, contract deployment, and the persistence of data on-chain.

Exploring Blockchain Stability

Reflecting on blockchain stability, redundancy, and the resilience of data even if a network provider shuts down.

Understanding Blockchain Interaction

Insights into interaction with blockchain networks, speed, security, and decentralization considerations for efficient operations.

Discussing Source Formatting

The speaker talks about the Source formatting and expresses mixed feelings about its readability but acknowledges that it gets the job done, despite being visually unattractive. They also mention the need to improve their CSS skills and discuss strategies for doing so.

Coding Practice with CodePen

The speaker shares their approach of practicing CSS skills by participating in CodePen challenges and recreating website designs using HTML and CSS. They highlight the benefits of such practice in accelerating learning.

Exploring CodePen Challenges

The speaker discusses the CodePen challenges offered on the website codepen.io, emphasizing the value of participating in these challenges to enhance CSS skills and learn from other participants' creations.

Customizing Articles

The speaker explores customizing the display of articles, including handling titles and URLs. They discuss refining the UI to display articles without titles and the process of displaying the URL instead.

Transaction Confirmation

The speaker addresses a transaction confirmation issue, mentioning the need to approve transactions in MetaMask. They also humorously suggest the idea of a Clippy-like assistant in MetaMask for guidance.

Decentralization in Apps

The speaker explains the concept of decentralization in applications, particularly in fetching data from APIs and triggering loading via contracts. They provide examples and discuss the decentralized aspects of storing data off-chain.

Data Feeds for Projects

The speaker suggests visiting data.chain.link for a full list of Chainlink data feeds available for future projects. They mention the importance of selecting accurate and reliable data feeds for decentralized applications.

Deployment and Interaction

The speaker mentions deploying the project to GitHub for others to explore and interact with. They encourage audience participation and address questions regarding running the project locally and contacting them for further queries.

Wrapping Up

The speaker concludes the session, expressing gratitude for the audience's participation and engagement. They reflect on the learning experience and the success of the webinar, thanking the audience for their involvement.


FAQ

Q: What is the importance of bridging the gap between Web 2 and Web 3?

A: Bridging the gap between Web 2 and Web 3 is crucial for transitioning towards decentralized technologies, enhancing security, and exploring new avenues for innovation.

Q: Can you explain the concept of a blockchain?

A: A blockchain is a shared ledger system where transactions are recorded and agreed upon by all network participants, emphasizing decentralization and security.

Q: What are test nets and faucets in the context of blockchain?

A: Test nets and faucets provide a risk-free environment for practicing blockchain interactions. Test net currency, often referred to as 'Monopoly money,' allows users to learn and test without financial consequences.

Q: What are proof of work and proof of stake consensus mechanisms?

A: Proof of work and proof of stake are consensus mechanisms used in blockchain networks. Proof of stake is considered more energy-efficient and secure compared to proof of work.

Q: How do smart contracts function on the blockchain?

A: Smart contracts are programmable agreements on the blockchain that execute automatically when certain conditions are met. They facilitate trustless and transparent interactions.

Q: What is the role of oracles in blockchain technology?

A: Oracles bring external, off-chain data onto the blockchain, ensuring data accuracy and trustworthiness in smart contract operations.

Q: Can you explain the setup process for a Metamask wallet?

A: Setting up a Metamask wallet involves creating a new wallet, securing it with a password, understanding public and private key pairs, and considering hardware wallets for enhanced security.

Q: How are gas fees related to blockchain transactions?

A: Gas fees incentivize nodes to process transactions on the blockchain. They play a crucial role in promoting good behavior and efficient practices within the blockchain ecosystem.

Q: What is the purpose of Chainlink tokens and the Chainlink Oracle Network?

A: Chainlink tokens, such as ETH and LINK, play a vital role in the Chainlink Oracle Network by enabling secure data transfer and triggering functions within smart contracts.

Q: Could you elaborate on the process of deploying a smart contract?

A: Deploying a smart contract involves using tools like Remix IDE, connecting with a wallet like Metamask, and waiting for confirmation on the blockchain. It is essential for executing code on the blockchain.

Q: How can one enhance their CSS skills for web development?

A: Practicing CSS skills through challenges like those on CodePen, recreating website designs, and experimenting with styling can accelerate learning and proficiency in web development.

Logo

Get your own AI Agent Today

Thousands of businesses worldwide are using Chaindesk Generative AI platform.
Don't get left behind - start building your own custom AI chatbot now!