Contract Name:
EthereumBlack
Contract Source Code:
File 1 of 1 : EthereumBlack
pragma solidity ^0.4.18;
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }
contract EthereumBlack {
// Public variables of ETBT
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
uint256 public funds;
address public director;
bool public saleClosed;
bool public directorLock;
uint256 public claimAmount;
uint256 public payAmount;
uint256 public feeAmount;
uint256 public epoch;
uint256 public retentionMax;
mapping (address => uint256) public balances;
mapping (address => mapping (address => uint256)) public allowance;
mapping (address => bool) public buried;
mapping (address => uint256) public claimed;
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
event Burn(address indexed _from, uint256 _value);
event Bury(address indexed _target, uint256 _value);
event Claim(address indexed _target, address indexed _payout, address indexed _fee);
function EthereumBlack() public {
director = msg.sender;
name = "Ethereum Black Token";
symbol = "ETBT";
decimals = 18;
saleClosed = false;
directorLock = false;
funds = 0;
totalSupply = 0;
// Token Sale: (50%)
totalSupply += 1750000 * 10 ** uint256(decimals);
// Reserves: (37%)
totalSupply += 1295000 * 10 ** uint256(decimals);
// Marketing & Community outreach: (8%)
totalSupply += 280000 * 10 ** uint256(decimals);
// Team: (5%)
totalSupply += 175000 * 10 ** uint256(decimals);
// 500000 ETBT Reserved for donate
// Assign reserved ETBT supply to the director
balances[director] = totalSupply;
// Define default values for EtherBlack functions
claimAmount = 5 * 10 ** (uint256(decimals) - 1);
payAmount = 4 * 10 ** (uint256(decimals) - 1);
feeAmount = 1 * 10 ** (uint256(decimals) - 1);
// Seconds in a year
epoch = 31536000;
retentionMax = 40 * 10 ** uint256(decimals);
}
function balanceOf(address _owner) public constant returns (uint256 balance) {
return balances[_owner];
}
modifier onlyDirector {
// Director can lock themselves out to complete decentralization of EtherBlack network
// An alternative is that another smart contract could become the decentralized director
require(!directorLock);
// Only the director is permitted
require(msg.sender == director);
_;
}
modifier onlyDirectorForce {
// Only the director is permitted
require(msg.sender == director);
_;
}
function transferDirector(address newDirector) public onlyDirectorForce {
director = newDirector;
}
function withdrawFunds() public onlyDirectorForce {
director.transfer(this.balance);
}
function selfLock() public payable onlyDirector {
// The sale must be closed before the director gets locked out
require(saleClosed);
// Prevents accidental lockout
require(msg.value == 10 ether);
// Permanently lock out the director
directorLock = true;
}
function amendClaim(uint8 claimAmountSet, uint8 payAmountSet, uint8 feeAmountSet, uint8 accuracy) public onlyDirector returns (bool success) {
require(claimAmountSet == (payAmountSet + feeAmountSet));
claimAmount = claimAmountSet * 10 ** (uint256(decimals) - accuracy);
payAmount = payAmountSet * 10 ** (uint256(decimals) - accuracy);
feeAmount = feeAmountSet * 10 ** (uint256(decimals) - accuracy);
return true;
}
function amendEpoch(uint256 epochSet) public onlyDirector returns (bool success) {
// Set the epoch
epoch = epochSet;
return true;
}
function amendRetention(uint8 retentionSet, uint8 accuracy) public onlyDirector returns (bool success) {
// Set retentionMax
retentionMax = retentionSet * 10 ** (uint256(decimals) - accuracy);
return true;
}
function closeSale() public onlyDirector returns (bool success) {
// The sale must be currently open
require(!saleClosed);
// Lock the crowdsale
saleClosed = true;
return true;
}
function openSale() public onlyDirector returns (bool success) {
// The sale must be currently closed
require(saleClosed);
// Unlock the crowdsale
saleClosed = false;
return true;
}
function bury() public returns (bool success) {
// The address must be previously unburied
require(!buried[msg.sender]);
// An address must have at least claimAmount to be buried
require(balances[msg.sender] >= claimAmount);
// Prevent addresses with large balances from getting buried
require(balances[msg.sender] <= retentionMax);
// Set buried state to true
buried[msg.sender] = true;
// Set the initial claim clock to 1
claimed[msg.sender] = 1;
// Execute an event reflecting the change
Bury(msg.sender, balances[msg.sender]);
return true;
}
function claim(address _payout, address _fee) public returns (bool success) {
// The claimed address must have already been buried
require(buried[msg.sender]);
// The payout and fee addresses must be different
require(_payout != _fee);
// The claimed address cannot pay itself
require(msg.sender != _payout);
// The claimed address cannot pay itself
require(msg.sender != _fee);
// It must be either the first time this address is being claimed or atleast epoch in time has passed
require(claimed[msg.sender] == 1 || (block.timestamp - claimed[msg.sender]) >= epoch);
// Check if the buried address has enough
require(balances[msg.sender] >= claimAmount);
// Reset the claim clock to the current block time
claimed[msg.sender] = block.timestamp;
// Save this for an assertion in the future
uint256 previousBalances = balances[msg.sender] + balances[_payout] + balances[_fee];
// Remove claimAmount from the buried address
balances[msg.sender] -= claimAmount;
// Pay the website owner that invoked the web node that found the ETBT seed key
balances[_payout] += payAmount;
// Pay the broker node that unlocked the ETBT
balances[_fee] += feeAmount;
// Execute events to reflect the changes
Claim(msg.sender, _payout, _fee);
Transfer(msg.sender, _payout, payAmount);
Transfer(msg.sender, _fee, feeAmount);
// Failsafe logic that should never be false
assert(balances[msg.sender] + balances[_payout] + balances[_fee] == previousBalances);
return true;
}
/**
* Crowdsale function
*/
function () public payable {
// Check if crowdsale is still active
require(!saleClosed);
// Minimum amount is 1 finney
require(msg.value >= 1 finney);
// Price is 1 ETH = 10000 ETBT
uint256 amount = msg.value * 10000;
// totalSupply limit is 4 million ETBT
require(totalSupply + amount <= (4000000 * 10 ** uint256(decimals)));
// Increases the total supply
totalSupply += amount;
// Adds the amount to the balance
balances[msg.sender] += amount;
// Track ETH amount raised
funds += msg.value;
// Execute an event reflecting the change
Transfer(this, msg.sender, amount);
}
function _transfer(address _from, address _to, uint _value) internal {
// Sending addresses cannot be buried
require(!buried[_from]);
// If the receiving address is buried, it cannot exceed retentionMax
if (buried[_to]) {
require(balances[_to] + _value <= retentionMax);
}
require(_to != 0x0);
require(balances[_from] >= _value);
require(balances[_to] + _value > balances[_to]);
uint256 previousBalances = balances[_from] + balances[_to];
balances[_from] -= _value;
balances[_to] += _value;
Transfer(_from, _to, _value);
assert(balances[_from] + balances[_to] == previousBalances);
}
function transfer(address _to, uint256 _value) public {
_transfer(msg.sender, _to, _value);
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
// Check allowance
require(_value <= allowance[_from][msg.sender]);
allowance[_from][msg.sender] -= _value;
_transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool success) {
// Buried addresses cannot be approved
require(!buried[msg.sender]);
allowance[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function approveAndCall(address _spender, uint256 _value, bytes _extraData) public returns (bool success) {
tokenRecipient spender = tokenRecipient(_spender);
if (approve(_spender, _value)) {
spender.receiveApproval(msg.sender, _value, this, _extraData);
return true;
}
}
function burn(uint256 _value) public returns (bool success) {
// Buried addresses cannot be burnt
require(!buried[msg.sender]);
// Check if the sender has enough
require(balances[msg.sender] >= _value);
// Subtract from the sender
balances[msg.sender] -= _value;
// Updates totalSupply
totalSupply -= _value;
Burn(msg.sender, _value);
return true;
}
function burnFrom(address _from, uint256 _value) public returns (bool success) {
// Buried addresses cannot be burnt
require(!buried[_from]);
// Check if the targeted balance is enough
require(balances[_from] >= _value);
// Check allowance
require(_value <= allowance[_from][msg.sender]);
// Subtract from the targeted balance
balances[_from] -= _value;
// Subtract from the sender's allowance
allowance[_from][msg.sender] -= _value;
// Update totalSupply
totalSupply -= _value;
Burn(_from, _value);
return true;
}
}