Module 1: Intro to Polkadot.js API

🔗 What is a Blockchain?

A blockchain is a distributed ledger technology that maintains a continuously growing list of records (blocks) that are linked and secured using cryptography.

🏗️ Key Blockchain Concepts:

• Decentralization: No single point of control or failure
• Immutability: Once data is recorded, it cannot be easily changed
• Transparency: All transactions are visible to network participants
• Consensus: Agreement mechanism for validating transactions

🌐 The Polkadot Ecosystem

Polkadot is a multi-chain platform that enables different blockchains to interoperate. It consists of:

• Relay Chain: The main Polkadot chain that coordinates the network
• Parachains: Independent blockchains that run in parallel
• Bridges: Connections to external networks like Ethereum

⚙️ What is Substrate?

Substrate is a blockchain development framework that makes it easy to build custom blockchains. Key features:

• Modular Design: Pick and choose components you need
• Upgradeable: Upgrade your blockchain without hard forks
• Interoperable: Built-in compatibility with Polkadot
• Developer Friendly: Rich ecosystem of tools and libraries

🎯 Why Learn Polkadot.js?

Polkadot.js is the primary JavaScript library for interacting with Substrate-based blockchains. It enables you to:

• Build web applications that interact with blockchains
• Query blockchain state and retrieve data
• Submit transactions and track their status
• Listen to real-time events and updates