The video discusses the essentials of Web3, highlighting its role as the internet for individuals with native payments and user-owned data. It covers the basics of blockchain technology, explaining how blocks are linked and secured by cryptography. The importance of smart contracts is emphasized, noting that they are self-executing contracts written in code. The video introduces Polygon, a platform that enhances Ethereum scalability and infrastructure, making transactions faster and cheaper. It also demonstrates how to interact with smart contracts using Ethers.js, focusing on connecting wallets, sending transactions, and fetching data. The role of gas fees in blockchain transactions is clarified, explaining that they compensate for the computing energy required to process and validate transactions. The video wraps up with practical steps for setting up a MetaMask wallet, obtaining test funds, and using a block explorer like PolygonScan to track blockchain interactions.
From Author:
There are many journeys we can take into becoming a web3 developer. Not all journeys require learning a completely new language and becoming a smart contract developer. In this workshop we will learn how to build our own React UI on top of any existing smart contracts on the Polygon Proof of Stake Blockchain. We will explore a basic overview of blockchains and learn about the advantages of building on Polygon. We will also gain an understanding of what Smart Contracts are, learn how to find existing ones, and learn tools that help us interact with them from a React application.
This workshop has been presented at React Summit 2022, check out the latest edition of this React Conference.
FAQ
Web3 introduces the concept of the internet for the individual, supported by blockchain technologies with native payments and data owned by the user. It represents an evolution from Web2, focusing on user data ownership and decentralized applications.
Smart contracts are self-executing contracts with the terms of the agreement directly written into code. They operate on blockchain technology, ensuring transparency and security. Each block in the blockchain contains data that is linked and secured using cryptography, forming an immutable ledger.
An Application Binary Interface (ABI) is essentially a list of the methods and structures used to interact with a binary contract, such as a smart contract on a blockchain. It enables the conversion of human-readable commands into a format that can be interpreted by the blockchain.
Polygon offers solutions for Ethereum scaling and infrastructure development, making transactions faster and cheaper. It supports EVM-compatible blockchains, allowing developers to deploy platforms efficiently with lower transaction fees.
Developers can interact with smart contracts using libraries such as ethers.js, which allow them to connect to a blockchain network, send transactions, and interact with contracts directly from their applications.
Gas fees are payments made by users to compensate for the computing energy required to process and validate transactions on the blockchain network. These fees help maintain network security and efficiency.
Ensuring smart contract security involves thorough testing, audits, and following best security practices in development. Using established frameworks and tools can also help in identifying vulnerabilities before deployment.
Tools like Third Web offer SDKs for building and managing smart contracts using low or no-code solutions. These tools provide a more accessible entry point for developers new to blockchain technology.
In this workshop, you'll learn how to build your first full stack dapp on the Ethereum blockchain, reading and writing data to the network, and connecting a front end application to the contract you've deployed. By the end of the workshop, you'll understand how to set up a full stack development environment, run a local node, and interact with any smart contract using React, HardHat, and Ethers.js.
Curious about how data works in the world of blockchain? Join Simon in an engaging session about The Graph, the decentralized indexing protocol that makes it easy for blockchain developers to search and query blockchain data. Table of the contents:- Understanding blockchain data- Anatomy of a smart contract- Indexing blockchain data with The Graph- Accessing data on The Graph- Recommended subgraphs- Writing subgraphs overview
How to Convert Crypto Currencies With GRPC Microservices in Node.js
Workshop
2 authors
The workshop overviews key architecture principles, design patterns, and technologies used to build microservices in the Node.js stack. It covers the theory of the GRPC framework and protocol buffers mechanism, as well as techniques and specifics of building isolated services using the monorepo approach with lerna and yarn workspaces, TypeScript. The workshop includes a live practical assignment to create a currency converter application that follows microservices paradigms. It fits the best developers who want to learn and practice GRPC microservices pattern with the Node.js platform. Prerequistes:- Good understanding of JavaScript or TypeScript- Experience with Node.js and writing Backend applications- Preinstall Node.js, npm- Preinstall Protocol Buffer Compiler- We prefer to use VSCode for a better experience with JavaScript and TypeScript (other IDEs are also ok)
In this session, we will build and deploy a decentralized application from scratch and delve into its additional features, all while minimizing the complexity typically associated with learning blockchain technology.By the end of this session, I hope attendees will not only have a clearer understanding of blockchain development, but also realize that building in this space can be surprisingly straightforward and enjoyable.My goal is to share my enthusiasm for open-source development and the potential of Web3.
The workshop is designed to help Web2 developers start building for Web3 using the Hyperverse. The Hyperverse is an open marketplace of community-built, audited, easy to discover smart modules. Our goal - to make it easy for JavaScript developers to build Web3 apps without writing a single line of smart contract code. Think “npm for smart contracts.”Learn more about the Hyperverse here.We will go over all the blockchain/crypto basics you need to know to start building on the Hyperverse, so you do not need to have any previous knowledge about the Web3 space. You just need to have JavaScript experience.
The workshop is designed to help Web2 developers start building for Web3 using the Hyperverse. The Hyperverse is an open marketplace of community-built, audited, easy to discover smart modules. Our goal - to make it easy for React developers to build Web3 apps without writing a single line of smart contract code. Think “npm for smart contracts.” Learn more about the Hyperverse here. We will go over all the blockchain/crypto basics you need to know to start building on the Hyperverse, so you do not need to have any previous knowledge about the Web3 space. You just need to have React experience.
Web3 gaming enables decentralized identity and finance, allowing game developers to bypass centralized platforms. It is driven by wallets, ERC20 tokens, and NFTs. Web3 games focus on collaborative world-building, ownership, and open-source collaboration. The challenge is achieving decentralization while addressing economic and technological limitations. Web3 aims to redefine the gaming industry by using economic tools and exploring new genres like RPG and RTS games.
In this Talk, Rafaela discusses Web3, its decentralized and token-based model, and the architecture based on smart contracts. Testing Web3 poses challenges due to the need for third-party providers like MetaMask. Approaches such as mocking the Web3 flow and using end-to-end testing tools like Taskafar are suggested. The trade-offs in Web3 testing include test speed and dependency on third-party apps. Balancing unit, integration, and end-to-end tasks is crucial for a robust testing strategy.
This talk covers an introduction to Web 3 and smart contracts, including deployment and bytecode compilation. It also discusses interacting with blockchain wallets, using RPC endpoints and block explorers, and accessing smart contract data. The talk emphasizes the use of ABIs and JavaScript libraries like ethers for interacting with smart contracts. It mentions the shift in mindset from HTTP requests to using ABI code and libraries for front-end development in Web 3. The talk concludes by mentioning Web3UI and tools like PolygonScan and Etherscan for building on the blockchain.
The Talk discusses building decentralized applications (DApps) with React and explores the benefits of smart contract technology. It highlights the characteristics and infrastructure of Web 3 applications, including decentralized indexing, off-chain data storage, and decentralized file storage. The Talk also covers identity in Web 3, with a focus on self-sovereign identity and the use of blockchain for identity verification. The process of building a DApp with React and Hard Hat is explained, along with deploying contracts and interacting with them. Overall, the Talk provides insights into the world of DApps and the technologies involved.
This Talk is about building GraphQL APIs on top of Ethereum and the Ethereum virtual machine. The graph is an indexing protocol for querying blockchain networks like Ethereum and IPFS. Developers can build APIs called subgraphs to efficiently index data and make it available for querying from frontend applications. The graph serves over 1 billion queries per day and is used in various Web3 applications including DeFi, gaming, and NFT marketplaces. The process involves defining the data model using the GraphQL schema and contract addresses, deploying and testing the subgraph, and using a GraphQL client to query the subgraph.
Today we will discuss the Web3JS library, its history, maintenance, and community involvement. The upcoming version 4 aims to address challenges faced in version 1 by introducing native TypeScript support, reduced size, improved code readability, and increased test coverage. Version 4 also introduces a new validator for easier Ethereum data validation and allows developers to customize how they handle numbers and bytes. It brings a dynamic data format for custom formatting and introduces TypeScript for contracts without transpiling. The API in version 4 is easy to extend and has future improvements and refactoring.
React Advanced Conference 2021
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