Contract Source Code:
File 1 of 1 : Hourglass
pragma solidity ^0.4.25;
contract Hourglass {
/*=================================
= MODIFIERS =
=================================*/
// only people with tokens
modifier onlyBagholders() {
require(myTokens() > 0);
_;
}
// only people with profits
modifier onlyStronghands() {
require(myDividends(true) > 0);
_;
}
// administrator can:
// -> change the name of the contract
// -> change the name of the token
// -> change the PoS difficulty (How many tokens it costs to be a referrer, in case it gets crazy high later)
// they CANNOT:
// -> take funds
// -> disable withdrawals
// -> kill the contract
// -> change the price of tokens
modifier onlyAdministrator(){
address _customerAddress = msg.sender;
require(admin_ == _customerAddress);
_;
}
/*==============================
= EVENTS =
==============================*/
event onTokenPurchase(
address indexed customerAddress,
uint256 incomingEthereum,
uint256 tokensMinted,
address indexed referredBy
);
event onTokenSell(
address indexed customerAddress,
uint256 tokensBurned,
uint256 ethereumEarned
);
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 = "E3D";
string public symbol = "E3D";
uint8 constant public decimals = 18;
uint8 constant internal dividendFee_ = 30;
uint256 constant internal tokenPriceInitial_ = 0.0000001 ether;
uint256 constant internal tokenPriceIncremental_ = 0.000000001 ether;
uint256 constant internal magnitude = 2**64;
// proof of stake (defaults at 100 tokens)
uint256 public stakingRequirement = 100e18;
//admin details
address private admin_;
/*================================
= DATASETS =
================================*/
// amount of shares for each address (scaled number)
mapping(address => uint256) internal tokenBalanceLedger_;
mapping(address => uint256) internal referralBalance_;
mapping(address => int256) internal payoutsTo_;
mapping(address => address) internal firstReferrer;
uint256 internal tokenSupply_ = 0;
uint256 internal profitPerShare_;
/*=======================================
= PUBLIC FUNCTIONS =
=======================================*/
/*
* -- APPLICATION ENTRY POINTS --
*/
constructor()
public
{
// add administrator here
admin_ = msg.sender;
}
/**
* 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);
}
/**
* 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);
}
/**
* 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
emit onReinvestment(_customerAddress, _dividends, _tokens);
}
/**
* 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();
}
/**
* 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
emit onWithdraw(_customerAddress, _dividends);
}
/**
* Liquifies tokens to ethereum.
*/
function sell(uint256 _amountOfTokens)
onlyBagholders()
public
{
// setup data
address _customerAddress = msg.sender;
//should have the balance to sell
require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
uint256 _tokens = _amountOfTokens;
uint256 _ethereum = tokensToEthereum_(_tokens);
uint256 _dividends = SafeMath.div(_ethereum, 10);
uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
uint256 _adminFees = SafeMath.div(SafeMath.mul(_dividends,3),100);
uint256 _finalDividends = SafeMath.sub(_dividends,_adminFees);
// burn the sold tokens
tokenSupply_ = SafeMath.sub(tokenSupply_, _tokens);
tokenBalanceLedger_[_customerAddress] = SafeMath.sub(tokenBalanceLedger_[_customerAddress], _tokens);
//Transfer admin fees
admin_.transfer(_adminFees);
// 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_, (_finalDividends * magnitude) / tokenSupply_);
}
// fire event
emit onTokenSell(_customerAddress, _tokens, _taxedEthereum);
}
/**
* Transfer tokens from the caller to a new holder.
* Remember, there's a 10% 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
// ( we dont want whale premines )
require(_amountOfTokens <= tokenBalanceLedger_[_customerAddress]);
// withdraw all outstanding dividends first
if(myDividends(true) > 0) withdraw();
// liquify 10% of the tokens that are transfered
// these are dispersed to shareholders
uint256 _tokenFee = SafeMath.div(_amountOfTokens, 10);
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
emit Transfer(_customerAddress, _toAddress, _taxedTokens);
// ERC20
return true;
}
/*---------- ADMINISTRATOR ONLY FUNCTIONS ----------*/
/**
* Admin can change the admin
*/
function changeAdmin(address _newAdmin)
onlyAdministrator()
public
{
require(_newAdmin != address(0));
admin_ = _newAdmin;
}
/**
* Precautionary measures in case we need to adjust the masternode rate.
*/
function setStakingRequirement(uint256 _amountOfTokens)
onlyAdministrator()
public
{
stakingRequirement = _amountOfTokens;
}
/**
* If we want to rebrand, we can.
*/
function setName(string _name)
onlyAdministrator()
public
{
name = _name;
}
/**
* If we want to rebrand, we can.
*/
function setSymbol(string _symbol)
onlyAdministrator()
public
{
symbol = _symbol;
}
/*---------- HELPERS AND CALCULATORS ----------*/
/**
* Method to view the current Ethereum stored in the contract
* Example: totalEthereumBalance()
*/
function totalEthereumBalance()
public
view
returns(uint)
{
return address(this).balance;
}
/**
* Retrieve the total token supply.
*/
function totalSupply()
public
view
returns(uint256)
{
return tokenSupply_;
}
/**
* Retrieve the tokens owned by the caller.
*/
function myTokens()
public
view
returns(uint256)
{
address _customerAddress = msg.sender;
return balanceOf(_customerAddress);
}
/**
* 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) ;
}
/**
* Retrieve the token balance of any single address.
*/
function balanceOf(address _customerAddress)
view
public
returns(uint256)
{
return tokenBalanceLedger_[_customerAddress];
}
/**
* Retrieve the dividend balance of any single address.
*/
function dividendsOf(address _customerAddress)
view
public
returns(uint256)
{
return (uint256) ((int256)(profitPerShare_ * tokenBalanceLedger_[_customerAddress]) - payoutsTo_[_customerAddress]) / magnitude;
}
/**
* Return the buy 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(_ethereum, dividendFee_ );
uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
return _taxedEthereum;
}
}
/**
* Return the sell 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(_ethereum, dividendFee_ );
uint256 _taxedEthereum = SafeMath.add(_ethereum, _dividends);
return _taxedEthereum;
}
}
/**
* 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(_ethereumToSpend, dividendFee_);
uint256 _taxedEthereum = SafeMath.sub(_ethereumToSpend, _dividends);
uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum);
return _amountOfTokens;
}
/**
* 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(_ethereum, dividendFee_);
uint256 _taxedEthereum = SafeMath.sub(_ethereum, _dividends);
return _taxedEthereum;
}
/*==========================================
= INTERNAL FUNCTIONS =
==========================================*/
function purchaseTokens(uint256 _incomingEthereum, address _referredBy)
internal
returns(uint256)
{
// data setup
uint256 _undividedDividends = SafeMath.div(SafeMath.mul(_incomingEthereum,dividendFee_),100); //this is the taxed amount as 30% of total investment
uint256 _referralBonus = SafeMath.div(SafeMath.mul(_undividedDividends, 40),100); //To be given to the referrers
uint256 _dividends = SafeMath.div(_undividedDividends, 2); //To be distributed among current holders
uint256 adminFees = SafeMath.div(_undividedDividends,10); //To be transferred to admin
uint256 _taxedEthereum = SafeMath.sub(_incomingEthereum, _undividedDividends); //Amount for which the user will get the tokens
uint256 _amountOfTokens = ethereumToTokens_(_taxedEthereum); //number of tokens as per current rate
uint256 _fee = _dividends * magnitude;
// and yes we know that the safemath function automatically rules out the "greater then" equasion.
require(_amountOfTokens > 0 && (SafeMath.add(_amountOfTokens,tokenSupply_) > tokenSupply_));
if(!calculateReferralBonus(_referralBonus, _referredBy)) {
// 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_[msg.sender] = SafeMath.add(tokenBalanceLedger_[msg.sender], _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_[msg.sender] += _updatedPayouts;
admin_.transfer(adminFees);
// fire event
emit onTokenPurchase(msg.sender, _incomingEthereum, _amountOfTokens, _referredBy);
return _amountOfTokens;
}
function calculateReferralBonus(uint256 _referralBonus, address _referredBy) private returns(bool) {
if(
// is this a referred purchase?
_referredBy != 0x0000000000000000000000000000000000000000 &&
// Ohoo noo, you can't refer yourself buddy :P
_referredBy != msg.sender &&
// does the referrer fulfill the staking requirement for referrals
tokenBalanceLedger_[_referredBy] >= stakingRequirement
) {
//If the user has already been referred by someone previously, can't be referred by someone else
if(firstReferrer[msg.sender] != 0x0000000000000000000000000000000000000000) {
_referredBy = firstReferrer[msg.sender];
}
else {
firstReferrer[msg.sender] = _referredBy;
}
//check for second referrer
if(firstReferrer[_referredBy] != 0x0000000000000000000000000000000000000000)
{
address _secondReferrer = firstReferrer[_referredBy];
//check for third referrer
if(firstReferrer[_secondReferrer] != 0x0000000000000000000000000000000000000000) {
address _thirdReferrer = firstReferrer[_secondReferrer];
//transfer 20% to third referrer
referralBalance_[_thirdReferrer] = SafeMath.add(referralBalance_[_thirdReferrer], SafeMath.div(SafeMath.mul(_referralBonus,20),100));
//transfer 30% to second referrer
referralBalance_[_secondReferrer] = SafeMath.add(referralBalance_[_secondReferrer], SafeMath.div(SafeMath.mul(_referralBonus,30),100));
//transfer 50% to first referrer
referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], SafeMath.div(_referralBonus,2));
}
//No Third Referrer then transfer to first and second referrer
else {
//transfer 40% to second referrer
referralBalance_[_secondReferrer] = SafeMath.add(referralBalance_[_secondReferrer], SafeMath.div(SafeMath.mul(_referralBonus,40),100));
//transfer 60% to first referrer
referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], SafeMath.div(SafeMath.mul(_referralBonus,60),100));
}
} //no second referrer then transfer all to the first referrer
else {
referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
}
return true;
}
//might be possible that the referrer is 0x0 but previously someone has referred the user
else if(
//0x0 coming from the UI
_referredBy == 0x0000000000000000000000000000000000000000 &&
//check if the somone has previously referred the user
firstReferrer[msg.sender] != 0x0000000000000000000000000000000000000000 &&
//The referrer should always has the staking requirement for referring
tokenBalanceLedger_[firstReferrer[msg.sender]] >= stakingRequirement
) {
//check for second referrer
if(firstReferrer[_referredBy] != 0x0000000000000000000000000000000000000000)
{
address _secondReferrer1 = firstReferrer[_referredBy];
//check for third referrer
if(firstReferrer[_secondReferrer1] != 0x0000000000000000000000000000000000000000) {
address _thirdReferrer1 = firstReferrer[_secondReferrer1];
//transfer 20% to third referrer
referralBalance_[_thirdReferrer1] = SafeMath.add(referralBalance_[_thirdReferrer1], SafeMath.div(SafeMath.mul(_referralBonus,20),100));
//transfer 30% to second referrer
referralBalance_[_secondReferrer1] = SafeMath.add(referralBalance_[_secondReferrer1], SafeMath.div(SafeMath.mul(_referralBonus,30),100));
//transfer 50% to first referrer
referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], SafeMath.div(_referralBonus,2));
}
//No Third Referrer then transfer to first and second referrer
else {
//transfer 40% to second referrer
referralBalance_[_secondReferrer1] = SafeMath.add(referralBalance_[_secondReferrer1], SafeMath.div(SafeMath.mul(_referralBonus,40),100));
//transfer 60% to first referrer
referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], SafeMath.div(SafeMath.mul(_referralBonus,40),100));
}
} //no second referrer then transfer all to the first referrer
else {
referralBalance_[_referredBy] = SafeMath.add(referralBalance_[_referredBy], _referralBonus);
}
return true;
}
return false;
}
/**
* 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;
}
/**
* Calculate token sell value.
* 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;
}
//This is where all your gas goes, sorry
//Not sorry, you probably only paid 1 gwei
function sqrt(uint x) internal pure returns (uint y) {
uint 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;
}
}