Bryanmankind

### Understanding EVM Storage Slots and Data Location in Solidity

The Ethereum Virtual Machine (EVM) employs a specific storage model for managing data within smart contracts. Understanding this model is essential for developing efficient and secure Solidity contracts. In this post, we will delve into the EVM storage slots and data location, providing a clear explanation of how Solidity leverages these concepts.

#### EVM Storage Model

The EVM uses a key-value store for contract storage, where each key is a 32-byte slot, and each value is 32 bytes of data. This model provides a simple yet powerful way to store and retrieve data in smart contracts.

#### Storage Slots

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.23;

import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import {IUniswapV3Pool} from "@uniswap/v3-core/contracts/interfaces/IUniswapV3Pool.sol";

contract PreSaleToken is ERC20 {
    constructor() ERC20("PreSaleToken", "PST") {

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";


contract PMT is ERC20 {
    constructor() ERC20("PERMIT", "PMT") {

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";


contract PMT is ERC20 {
    constructor() ERC20("PERMIT", "PMT") {

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";


contract PMT is ERC20 {
    constructor() ERC20("PERMIT", "PMT") {

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract PMT is ERC20 {
    constructor() ERC20("PERMIT", "PMT") {
        // Mint initial supply to contract creator

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract PMT is ERC20 {
    constructor() ERC20("PERMIT", "PMT") {
        // Mint initial supply to contract creator

Bryanmankind

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "@openzeppelin/contracts/interfaces/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract PMT is ERC20 {
    constructor() ERC20("PERMIT", "PMT") {
        // Mint initial supply to contract creator

Bryanmankind

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */