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- pragma solidity ^0.4.20;
- contract BlackPearlETC {
- /*=================================
- = MODIFIERS =
- =================================*/
- /// @dev Only people with tokens
- modifier onlyBagholders {
- require(myTokens() > 0);
- _;
- }
- /// @dev Only people with profits
- modifier onlyStronghands {
- require(myDividends(true) > 0);
- _;
- }
- /*==============================
- = EVENTS =
- ==============================*/
- event onTokenPurchase(
- address indexed customerAddress,
- uint256 incomingEthereum,
- uint256 tokensMinted,
- address indexed referredBy,
- uint timestamp,
- uint256 price
- );
- event onTokenSell(
- address indexed customerAddress,
- uint256 tokensBurned,
- uint256 ethereumEarned,
- uint timestamp,
- uint256 price
- );
- event onReinvestment(
- address indexed customerAddress,
- uint256 ethereumReinvested,
- uint256 tokensMinted
- );
- event onWithdraw(
- address indexed customerAddress,
- uint256 ethereumWithdrawn
- );
- // ERC20
- event Transfer(
- address indexed from,
- address indexed to,
- uint256 tokens
- );
- /*=====================================
- = CONFIGURABLES =
- =====================================*/
- string public name = "Black Pearl ETC";
- string public symbol = "MEDA";
- uint8 constant public decimals = 18;
- /// @dev 20% dividends for token purchase
- uint8 constant internal entryFee_ = 20;
- /// @dev 1% dividends for token transfer
- uint8 constant internal transferFee_ = 1;
- /// @dev 10% dividends for token selling
- uint8 constant internal exitFee_ = 10;
- /// @dev 15% masternode
- uint8 constant internal refferalFee_ = 15;
- uint256 constant internal tokenPriceInitial_ = 0.00000001 ether;
- uint256 constant internal tokenPriceIncremental_ = 0.000000001 ether;
- uint256 constant internal magnitude = 2 ** 64;
- /// @dev 250 Medaillions needed for masternode activation
- uint256 public stakingRequirement = 250e18;
- /*=================================
- = DATASETS =
- ================================*/
- // amount of shares for each address (scaled number)
- mapping(address => uint256) internal tokenBalanceLedger_;
- mapping(address => uint256) internal referralBalance_;
- mapping(address => int256) internal payoutsTo_;
- uint256 internal tokenSupply_;
- uint256 internal profitPerShare_;
- /*=======================================
- = PUBLIC FUNCTIONS =
- =======================================*/
- /// @dev Converts all incoming ethereum to tokens for the caller, and passes down the referral addy (if any)
- function buy(address _referredBy) public payable returns (uint256) {
- purchaseTokens(msg.value, _referredBy);
- }
- /**
- * @dev Fallback function to handle ethereum that was send straight to the contract
- * Unfortunately we cannot use a referral address this way.
- */
- function() payable public {
- purchaseTokens(msg.value, 0x0);
- }
- /// @dev Converts all of caller's dividends to tokens.
- function reinvest() onlyStronghands public {
- // fetch dividends
- uint256 _dividends = myDividends(false); // retrieve ref. bonus later in the code
- // pay out the dividends virtually
- address _customerAddress = msg.sender;
- payoutsTo_[_customerAddress] += (int256) (_dividends * magnitude);
- // retrieve ref. bonus
- _dividends += referralBalance_[_customerAddress];
- referralBalance_[_customerAddress] = 0;
- // dispatch a buy order with the virtualized "withdrawn dividends"
- uint256 _tokens = purchaseTokens(_dividends, 0x0);
- // fire event
- onReinvestment(_customerAddress, _dividends, _tokens);
- }
- /// @dev Alias of sell() and withdraw().
- function exit() public {
- // get token count for caller & sell them all
- address _customerAddress = msg.sender;
- uint256 _tokens = tokenBalanceLedger_[_customerAddress];
- if (_tokens > 0) sell(_tokens);
- // lambo delivery service
- withdraw();
- }
- /// @dev Withdraws all of the callers earnings.
- function withdraw() onlyStronghands public {
- // setup data
- address _customerAddress = msg.sender;
- uint256 _dividends = myDividends(false); // get ref. bonus later in the code
- // update dividend tracker
- payoutsTo_[_customerAddress] += (int256) (_dividends * magnitude);
- // add ref. bonus
- _dividends += referralBalance_[_customerAddress];
- referralBalance_[_customerAddress] = 0;
- // lambo delivery service
- _customerAddress.transfer(_dividends);
- // fire event
- onWithdraw(_customerAddress, _dividends);
- }
- /// @dev Liquifies tokens to ethereum.
- function sell(uint256 _amountOfTokens) onlyBagholders public {
- // setup data
- address _customerAddress = msg.sender;
- // russian hackers BTFO
- require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
- uint256 _tokens = _amountOfTokens;
- uint256 _ethereum = tokensToEthereum_(_tokens);
- uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, exitFee_), 100);
- uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
- // burn the sold tokens
- tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
- tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
- // update dividends tracker
- int256 _updatedPayouts = (int256) (profitPerShare_ * _tokens + (_taxedEthereum * magnitude));
- payoutsTo_[_customerAddress] -= _updatedPayouts;
- // dividing by zero is a bad idea
- if (tokenSupply_ > 0) {
- // update the amount of dividends per token
- profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
- }
- // fire event
- onTokenSell(_customerAddress, _tokens, _taxedEthereum, now, buyPrice());
- }
- /**
- * @dev Transfer tokens from the caller to a new holder.
- * Remember, there's a 1% fee here as well.
- */
- function transfer(address _toAddress, uint256 _amountOfTokens) onlyBagholders public returns (bool) {
- // setup
- address _customerAddress = msg.sender;
- // make sure we have the requested tokens
- require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
- // withdraw all outstanding dividends first
- if (myDividends(true) > 0) {
- withdraw();
- }
- // liquify 1% of the tokens that are transfered
- // these are dispersed to shareholders
- uint256 _tokenFee = SafeMath.div(SafeMath.mul(_amountOfTokens, transferFee_), 100);
- uint256 _taxedTokens = SafeMath.sub(_amountOfTokens, _tokenFee);
- uint256 _dividends = tokensToEthereum_(_tokenFee);
- // burn the fee tokens
- tokenSupply_ = SafeMath.sub(tokenSupply_, _tokenFee);
- // exchange tokens
- tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
- tokenBalanceLedger_[_toAddress] = SafeMath.add(tokenBalanceLedger_[_toAddress], _taxedTokens);
- // update dividend trackers
- payoutsTo_[_customerAddress] -= (int256) (profitPerShare_ * _amountOfTokens);
- payoutsTo_[_toAddress] += (int256) (profitPerShare_ * _taxedTokens);
- // disperse dividends among holders
- profitPerShare_ = SafeMath.add(profitPerShare_, (_dividends * magnitude) / tokenSupply_);
- // fire event
- Transfer(_customerAddress, _toAddress, _taxedTokens);
- // ERC20
- return true;
- }
- /*=====================================
- = HELPERS AND CALCULATORS =
- =====================================*/
- /**
- * @dev Method to view the current Ethereum stored in the contract
- * Example: totalEthereumBalance()
- */
- function totalEthereumBalance() public view returns (uint256) {
- return this.balance;
- }
- /// @dev Retrieve the total token supply.
- function totalSupply() public view returns (uint256) {
- return tokenSupply_;
- }
- /// @dev Retrieve the tokens owned by the caller.
- function myTokens() public view returns (uint256) {
- address _customerAddress = msg.sender;
- return balanceOf(_customerAddress);
- }
- /**
- * @dev Retrieve the dividends owned by the caller.
- * If `_includeReferralBonus` is to to 1/true, the referral bonus will be included in the calculations.
- * The reason for this, is that in the frontend, we will want to get the total divs (global + ref)
- * But in the internal calculations, we want them separate.
- */
- function myDividends(bool _includeReferralBonus) public view returns (uint256) {
- address _customerAddress = msg.sender;
- return _includeReferralBonus ? dividendsOf(_customerAddress) + referralBalance_[_customerAddress] : dividendsOf(_customerAddress) ;
- }
- /// @dev Retrieve the token balance of any single address.
- function balanceOf(address _customerAddress) public view returns (uint256) {
- return tokenBalanceLedger_[_customerAddress];
- }
- /// @dev Retrieve the dividend balance of any single address.
- function dividendsOf(address _customerAddress) public view returns (uint256) {
- return (uint256) ((int256) (profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
- }
- /// @dev Return the sell price of 1 individual token.
- function sellPrice() public view returns (uint256) {
- // our calculation relies on the token supply, so we need supply. Doh.
- if (tokenSupply_ == 0) {
- return tokenPriceInitial_ - tokenPriceIncremental_;
- } else {
- uint256 _ethereum = tokensToEthereum_(1e18);
- uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, exitFee_), 100);
- uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
- return _taxedEthereum;
- }
- }
- /// @dev Return the buy price of 1 individual token.
- function buyPrice() public view returns (uint256) {
- // our calculation relies on the token supply, so we need supply. Doh.
- if (tokenSupply_ == 0) {
- return tokenPriceInitial_ + tokenPriceIncremental_;
- } else {
- uint256 _ethereum = tokensToEthereum_(1e18);
- uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, entryFee_), 100);
- uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
- return _taxedEthereum;
- }
- }
- /// @dev Function for the frontend to dynamically retrieve the price scaling of buy orders.
- function calculateTokensReceived(uint256 _ethereumToSpend) public view returns (uint256) {
- uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereumToSpend, entryFee_), 100);
- uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);
- uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
- return _amountOfTokens;
- }
- /// @dev Function for the frontend to dynamically retrieve the price scaling of sell orders.
- function calculateEthereumReceived(uint256 _tokensToSell) public view returns (uint256) {
- require(_tokensToSell <= tokenSupply_);
- uint256 _ethereum = tokensToEthereum_(_tokensToSell);
- uint256 _dividends = SafeMath.div(SafeMath.mul(_ethereum, exitFee_), 100);
- uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
- return _taxedEthereum;
- }
- /*==========================================
- = INTERNAL FUNCTIONS =
- ==========================================*/
- /// @dev Internal function to actually purchase the tokens.
- function purchaseTokens(uint256 _incomingEthereum, address _referredBy) internal returns (uint256) {
- // data setup
- address _customerAddress = msg.sender;
- uint256 _undividedDividends = SafeMath.div(SafeMath.mul(_incomingEthereum, entryFee_), 100);
- uint256 _referralBonus = SafeMath.div(SafeMath.mul(_undividedDividends, refferalFee_), 100);
- uint256 _dividends = SafeMath.sub(_undividedDividends, _referralBonus);
- uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends);
- uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
- uint256 _fee = _dividends * magnitude;
- // no point in continuing execution if OP is a poorfag russian hacker
- // prevents overflow in the case that the pyramid somehow magically starts being used by everyone in the world
- // (or hackers)
- // and yes we know that the safemath function automatically rules out the "greater then" equasion.
- require(_amountOfTokens > 0 && SafeMath.add(_amountOfTokens, tokenSupply_) > tokenSupply_);
- // is the user referred by a masternode?
- if (
- // is this a referred purchase?
- _referredBy != 0x0000000000000000000000000000000000000000 &&
- // no cheating!
- _referredBy != _customerAddress &&
- // does the referrer have at least X whole tokens?
- // i.e is the referrer a godly chad masternode
- tokenBalanceLedger_[_referredBy] >= stakingRequirement
- ) {
- // wealth redistribution
- referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
- } else {
- // no ref purchase
- // add the referral bonus back to the global dividends cake
- _dividends = SafeMath.add(_dividends, _referralBonus);
- _fee = _dividends * magnitude;
- }
- // we can't give people infinite ethereum
- if (tokenSupply_ > 0) {
- // add tokens to the pool
- tokenSupply_ = SafeMath.add(tokenSupply_, _amountOfTokens);
- // take the amount of dividends gained through this transaction, and allocates them evenly to each shareholder
- profitPerShare_ += (_dividends * magnitude / tokenSupply_);
- // calculate the amount of tokens the customer receives over his purchase
- _fee = _fee - (_fee - (_amountOfTokens * (_dividends * magnitude / tokenSupply_)));
- } else {
- // add tokens to the pool
- tokenSupply_ = _amountOfTokens;
- }
- // update circulating supply & the ledger address for the customer
- tokenBalanceLedger_[_customerAddress] = SafeMath.add(tokenBalanceLedger_[_customerAddress], _amountOfTokens);
- // Tells the contract that the buyer doesn't deserve dividends for the tokens before they owned them;
- // really i know you think you do but you don't
- int256 _updatedPayouts = (int256) (profitPerShare_ * _amountOfTokens - _fee);
- payoutsTo_[_customerAddress] += _updatedPayouts;
- // fire event
- onTokenPurchase(_customerAddress, _incomingEthereum, _amountOfTokens, _referredBy, now, buyPrice());
- return _amountOfTokens;
- }
- /**
- * @dev Calculate Token price based on an amount of incoming ethereum
- * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
- * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
- */
- function ethereumToTokens_(uint256 _ethereum) internal view returns (uint256) {
- uint256 _tokenPriceInitial = tokenPriceInitial_ * 1e18;
- uint256 _tokensReceived =
- (
- (
- // underflow attempts BTFO
- SafeMath.sub(
- (sqrt
- (
- (_tokenPriceInitial ** 2)
- +
- (2 * (tokenPriceIncremental_ * 1e18) * (_ethereum * 1e18))
- +
- ((tokenPriceIncremental_ ** 2) * (tokenSupply_ ** 2))
- +
- (2 * tokenPriceIncremental_ * _tokenPriceInitial*tokenSupply_)
- )
- ), _tokenPriceInitial
- )
- ) / (tokenPriceIncremental_)
- ) - (tokenSupply_);
- return _tokensReceived;
- }
- /**
- * @dev Calculate token sell value.
- * It's an algorithm, hopefully we gave you the whitepaper with it in scientific notation;
- * Some conversions occurred to prevent decimal errors or underflows / overflows in solidity code.
- */
- function tokensToEthereum_(uint256 _tokens) internal view returns (uint256) {
- uint256 tokens_ = (_tokens + 1e18);
- uint256 _tokenSupply = (tokenSupply_ + 1e18);
- uint256 _etherReceived =
- (
- // underflow attempts BTFO
- SafeMath.sub(
- (
- (
- (
- tokenPriceInitial_ + (tokenPriceIncremental_ * (_tokenSupply / 1e18))
- ) - tokenPriceIncremental_
- ) * (tokens_ - 1e18)
- ), (tokenPriceIncremental_ * ((tokens_ ** 2 - tokens_) / 1e18)) / 2
- )
- / 1e18);
- return _etherReceived;
- }
- /// @dev This is where all your gas goes.
- function sqrt(uint256 x) internal pure returns (uint256 y) {
- uint256 z = (x + 1) / 2;
- y = x;
- while (z < y) {
- y = z;
- z = (x / z + z) / 2;
- }
- }
- }
- /**
- * @title SafeMath
- * @dev Math operations with safety checks that throw on error
- */
- library SafeMath {
- /**
- * @dev Multiplies two numbers, throws on overflow.
- */
- function mul(uint256 a, uint256 b) internal pure returns (uint256) {
- if (a == 0) {
- return 0;
- }
- uint256 c = a * b;
- assert(c / a == b);
- return c;
- }
- /**
- * @dev Integer division of two numbers, truncating the quotient.
- */
- function div(uint256 a, uint256 b) internal pure returns (uint256) {
- // assert(b > 0); // Solidity automatically throws when dividing by 0
- uint256 c = a / b;
- // assert(a == b * c + a % b); // There is no case in which this doesn't hold
- return c;
- }
- /**
- * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
- */
- function sub(uint256 a, uint256 b) internal pure returns (uint256) {
- assert(b <= a);
- return a - b;
- }
- /**
- * @dev Adds two numbers, throws on overflow.
- */
- function add(uint256 a, uint256 b) internal pure returns (uint256) {
- uint256 c = a + b;
- assert(c >= a);
- return c;
- }
- }
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