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•  contract O *
•    - function transfer(address _to, uint25 ...
•    - function approve(address _spender, ui ...
•    - function transferFrom(address _from, ...
•    - function mint()
•    - function mintable()

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/**
 *Submitted for verification at Etherscan.io on 2024-01-28
*/

/**
At the heart of "O" lies an aggressive scarcity protocol - a halving event occurs with every new block on the blockchain. Starting with an initial reward of 1 "O", each subsequent block sees the minting reward halved:

Block 1: Mint 1 "O"
Block 2: Mint 0.5 "O"
Block 3: Mint 0.25 "O"
...and so on
This relentless halving continues, dramatically accelerating the path to scarcity. Each block mined is a step closer to an era where "O" tokens become a symbol of ultimate digital rarity.
*/
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract O {
    string public name = "O";
    string public symbol = "O";
    uint8 public decimals = 18;
    uint256 public totalSupply;
    uint256 public lastMintingBlock;
    uint256 public initialMintAmount = 1e18; // Starting with 1 token
    uint256 public mintStartTime = 1706406582; // UNIX timestamp for when minting can start

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor() {
        totalSupply = 1; // Initial supply is 1 token
        balanceOf[msg.sender] = totalSupply; // Assigning initial supply to deployer
        emit Transfer(address(0), msg.sender, totalSupply);
        lastMintingBlock = block.number;
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        require(balanceOf[msg.sender] >= _value, "Insufficient balance");
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= balanceOf[_from], "Insufficient balance");
        require(_value <= allowance[_from][msg.sender], "Insufficient allowance");
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        allowance[_from][msg.sender] -= _value;
        emit Transfer(_from, _to, _value);
        return true;
    }

    function mint() public {
        require(block.timestamp >= mintStartTime, "Minting has not started yet");
        uint256 numberToMint = mintable();
        require(numberToMint > 0, "Mintable amount is too low");
        totalSupply += numberToMint;
        balanceOf[msg.sender] += numberToMint;
        lastMintingBlock = block.number;
    }

    function mintable() public view returns (uint256 numberToMint) {
        if(block.timestamp < mintStartTime) {
            return 0;
        }
        uint256 blocksSinceLastMint = block.number - lastMintingBlock;
        if(blocksSinceLastMint > 0) {
            numberToMint = initialMintAmount >> blocksSinceLastMint; // Shift right to halve the amount each block
            return numberToMint;
        } else {
            return 0;
        }
    }
}

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[{"inputs":[],"stateMutability":"nonpayable","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"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"initialMintAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lastMintingBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"mintStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintable","outputs":[{"internalType":"uint256","name":"numberToMint","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"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"}],"stateMutability":"nonpayable","type":"function"}]

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