valterlobo

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract Vault is Ownable {

valterlobo

package main

import (
	"fmt"

	"github.com/ethereum/go-ethereum/accounts"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/crypto"
)

valterlobo

    // Struct to store the attributes for each token
    struct TokenData {
        int encryptedLat;
        int encryptedLon;
        string ipfsCid;
        uint256 lastUpdated;
    }
    
    History TokenData[] 
    

valterlobo

contract PFPMonster is ERC721, ERC721Enumerable, Ownable {
    string private _baseURIextended;
    uint256 public MAX_SUPPLY = 1888;
    uint256 public MAX_TX_MINT = 5;
    uint256 public MAX_MINT_PER_WALLET = 5;
    uint256 public PRICE_PER_TOKEN_PUBLIC_SALE = 0.069 ether;
    uint256 public PRICE_PER_TOKEN_PRE_SALE = 0.0069 ether;

    uint256 private currentTokenId = 1;

valterlobo

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

//Issues of Returning Arrays of Dynamic Size in Solidity Smart Contracts
//https://betterprogramming.pub/issues-of-returning-arrays-of-dynamic-size-in-solidity-smart-contracts-dd1e54424235

contract ReturnLimitTestWithPagination {
    uint256[] private array;

    function addToArray(uint256 count) external {

valterlobo

List of patterns a Solidity developer has to know.

Must-know patters:

- Proxy contracts (transparent, UUPS, minimal, beacon)

- Diamond storage

- Packed storage

valterlobo

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Capped.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract MyToken is ERC20Capped, Ownable, ERC20Burnable {
    constructor(uint256 cap, uint256 initialSupply)

valterlobo

git init -b main 

#add remote 
git remote add origin  git@<REMOTE URL> 

git add  ....
git commit .... 

git push --set-upstream origin main

valterlobo

pass cheat sheet/guide

Getting started guide to the unix password manager pass. Manage gpg encripted passwords (files) in a standar directory-like hierarchy. Such files can be copied or stored in a git repository.

Requirements

1. Install [pass][pass-homepage] (standard unix password manager):

Ubuntu/Debian:

$ sudo apt-get install pass

valterlobo

import os
from dotenv import load_dotenv
from web3 import Web3




load_dotenv()

# ERC 20 SEND