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| // What is Basic Income? | |
| // Why? | |
| // How? Dividend issuing token every x interval, like a week. Polygon, fast, cheap | |
| // Problem - Proof of Unique Identity | |
| // | |
| pragma solidity ^0.4.21; | |
| contract BasicIncomeToken { | |
| //DEFINE TOKEN NAMING | |
| string public name = "Basic Income Token"; | |
| string public symbol = "BIT"; | |
| //DEFINE SUPPLY | |
| // This code assumes decimals is zero---do not change. | |
| uint8 public decimals = 0; // DO NOT CHANGE! | |
| uint256 public totalSupply = 1000000 * (uint256(10) ** decimals); | |
| mapping(address => uint256) public balanceOf; | |
| constructor() public { | |
| // Initially assign all tokens to the contract's creator. | |
| balanceOf[msg.sender] = totalSupply; | |
| emit Transfer(address(0), msg.sender, totalSupply); | |
| } | |
| mapping(address => uint256) dividendBalanceOf; | |
| uint256 public dividendPerToken; | |
| mapping(address => uint256) dividendCreditedTo; | |
| function update(address account) internal { | |
| uint256 owed = | |
| dividendPerToken - dividendCreditedTo[account]; | |
| dividendBalanceOf[account] += balanceOf[account] * owed; | |
| dividendCreditedTo[account] = dividendPerToken; | |
| } | |
| event Transfer(address indexed from, address indexed to, uint256 value); | |
| event Approval(address indexed owner, address indexed spender, uint256 value); | |
| mapping(address => mapping(address => uint256)) public allowance; | |
| function transfer(address to, uint256 value) public returns (bool success) { | |
| require(balanceOf[msg.sender] >= value); | |
| update(msg.sender); // <-- added to simple ERC20 contract | |
| update(to); // <-- added to simple ERC20 contract | |
| balanceOf[msg.sender] -= value; | |
| balanceOf[to] += value; | |
| emit Transfer(msg.sender, to, value); | |
| return true; | |
| } | |
| function transferFrom(address from, address to, uint256 value) | |
| public | |
| returns (bool success) | |
| { | |
| require(value <= balanceOf[from]); | |
| require(value <= allowance[from][msg.sender]); | |
| update(from); // <-- added to simple ERC20 contract | |
| update(to); // <-- added to simple ERC20 contract | |
| balanceOf[from] -= value; | |
| balanceOf[to] += value; | |
| allowance[from][msg.sender] -= value; | |
| emit Transfer(from, to, value); | |
| return true; | |
| } | |
| function deposit() public payable { | |
| dividendPerToken += msg.value / totalSupply; // ignoring remainder | |
| } | |
| function withdraw() public { | |
| update(msg.sender); | |
| uint256 amount = dividendBalanceOf[msg.sender]; | |
| dividendBalanceOf[msg.sender] = 0; | |
| msg.sender.transfer(amount); | |
| } | |
| function approve(address spender, uint256 value) | |
| public | |
| returns (bool success) | |
| { | |
| allowance[msg.sender][spender] = value; | |
| emit Approval(msg.sender, spender, value); | |
| return true; | |
| } | |
| } |
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