Decentralized Applications Development Tutorials, Guides & Insights

• API: This script uses Infura’s node access and Ethers.js to send Ether in real-time.
• Use Case: Essential for dApps, wallets, or any application needing to send transactions or interact with the blockchain live.

• Data Analytics: Use Etherscan if you need to fetch historical data, such as transaction histories, token balances, or account balances.
• Blockchain Explorers: Ideal for building tools similar to Etherscan itself, where you query and display blockchain data to users.
• Read-Only Data: You can’t send transactions, but you can retrieve information about any Ethereum address, smart contract, or token transfer.

• Decentralized Exchanges (DEXs): Many decentralized exchanges (like Uniswap) require ERC-20 tokens for trading. WETH allows ETH holders to trade ETH just like any other ERC-20 token.
• DeFi Lending Platforms: Platforms such as Aave or Compound often require collateral in the form of ERC-20 tokens, making WETH essential for ETH holders who want to participate.
• Token Swaps: WETH allows for seamless token swaps between ETH and other ERC-20 tokens on platforms that support such swaps.

ETH and WETH serve different but complementary roles in the Ethereum ecosystem. While ETH is the native currency used to power the network, WETH enables ETH to interact with the growing number of decentralized applications and DeFi protocols that rely on the ERC-20 standard. By understanding how to wrap and unwrap ETH, you can effectively engage in the broader Ethereum DeFi ecosystem without leaving the native ETH environment.

Before diving into Solana's Program Library, ensure you have the following:

Solana's Program Library (SPL) is a collection of on-chain programs (smart contracts) that provide reusable functionality for developers. These programs handle a wide range of use cases, such as token creation, decentralized exchanges, and more. By using SPL, you can avoid writing common functionalities from scratch, allowing you to focus on the unique aspects of your dApp.

Key Points:

• Gas Limit: The maximum amount of gas a user is willing to spend on a transaction.
• Gas Price: The amount of Ether a user is willing to pay per unit of gas.
• Gas Cost: The total amount of gas consumed by a transaction, multiplied by the gas price, determines the total fee paid.

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract MessageStore {
    string public message;

    function setMessage(string memory newMessage) public {
        message = newMessage;
    }

    function getMessage() public view returns (string memory) {
        return message;
    }
}

Explanation: