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Contract Overview
Balance: 1.571279036875415396 Ether
Ether Value: $943.76 (@ $600.63/ETH)
Transactions: 2741 txns
Token Contract: EthPyramid (EPY)
 Latest 25 txns from a total Of 2741 transactions
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TxHash Age From To Value [TxFee]
0x70b714997304a99bb207bd5c02901a8b7c7d3890bed90d5986f2b2c37d9931d11 hr 34 mins ago0x341c48c0e833e179cca6c605b823e9a4911a3d00  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.00062555
0x02c8a197a87939ab15569f9b003eabfc9680bb410afee7bc10dad253d523d8d73 days 1 hr ago0x2478b5684da7ef83fed4db126e27a8ae8f9632ec  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000719851
0x86c60ffec2bb4b5c079a8fa8525c0cae0b089906d9b8bcf324f9f2d36a264c795 days 21 hrs ago0x6620aa7390413099623e514627a08cdbd02d73c7  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.0001313655
0xd593a007849385163bbf45867aa0f0fa8d58164d9eb14cb5bcd6afdd88e60ee46 days 16 hrs ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.005 Ether0.00059181
0xbda92516b8f8bd41dbda694705c2dfc096dbe08b4a0d6fce390145a9b112202b6 days 22 hrs ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.03 Ether0.000710172
0xd84b1d95a1dc7e7278f31dc99391e458c25c03acd22ab9a16105d20015324d598 days 11 hrs ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.03 Ether0.00059181
0xe7c9adcd0e43bfe8e2ab620b3d057fef248e15d9d70e3ba95e961284d982caff10 days 21 hrs ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.025 Ether0.00059181
0xa5c7ef161189379bbe35477820dbd3fcaee46183918c6d731f14bb8b6a04b74f10 days 21 hrs ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.015 Ether0.00059253
0x0ed1d7207d18c8b44313c0736471c2bdc7f1e0dd178a37a25598efdc680f900512 days 4 hrs ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.01 Ether0.000474024
0x619098d4d95f15d2e4b94ebee34b1643b239c2a3f6233d7049367b549359ce3b13 days 11 hrs ago0x8d431f225526f9f52c6441358c44cef124a1516b  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000250508
0x7ba38516bff0dafff9a473062bd28ba58569d88c12c71385899c61509f35ea9413 days 11 hrs ago0x1ed45acba1c716c8fbe88aa35d27842fb612e20a  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000187665
0x896521c79035e233b69d92410918a8714fd9cc05c21cea183671ad9021210de715 days 23 hrs ago0x3052e2dbf3c84cf0b9693ebe6a7ef1b11b93cd42  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000229635
0x075dcdbf028df3455405aa5910289e87bba1d57a36623fff246c4199b1304c7816 days 27 mins ago0x3052e2dbf3c84cf0b9693ebe6a7ef1b11b93cd42  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000228918
0x44ef836fcaae76a152710c829af85d627adfedf686b9ff09bac9d6415c0c550e18 days 1 hr ago0x361084af8d45e07885b31fcedcb642b9cc7b72d7  IN   0x029d0650c81817afb1810ae102708233183218780.008716 Ether0.000118362
0xb95d05ec346df20387c405c62be1a2ea0ee65fac4affc8d543a3676d6e1bfca120 days 15 hrs ago0x1ed45acba1c716c8fbe88aa35d27842fb612e20a  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.0001374261
0xff11c4e0ac1f0708fab5dc080fcfc6375a2ede5b6a6662bb4e0cc0c995a74df322 days 18 hrs ago0x341c48c0e833e179cca6c605b823e9a4911a3d00  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000137781
0x6c4721fa580e5f4f2a36c85a14dc16f97b4dbc9c4fd59753d522b66497795d6a23 days 20 hrs ago0x415e94a5246ac4d3f16a833f51ff9066f215a421  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.0001194102
0x8f5ba9761c0919538419de99087b6f1b6416258c7938fdbb49b0917883e80bed23 days 23 hrs ago0x3052e2dbf3c84cf0b9693ebe6a7ef1b11b93cd42  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000183708
0x4170316f569d011af159899f7ca2d05ce53dbff6fec13f6ca4701af71dc75d0324 days 10 hrs ago0x1ed45acba1c716c8fbe88aa35d27842fb612e20a  IN   0x029d0650c81817afb1810ae102708233183218780.2 Ether0.0001872801
0x95d3efaf9905dd24484afc85bbbfc91c810c40e4079e83a7cda1598812315f2e24 days 21 hrs ago0x415e94a5246ac4d3f16a833f51ff9066f215a421  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.0001102248
0x5697f27aa8f22f6a7e6a055cad883acd232997cc162cba28505f3b6f512d7bc824 days 21 hrs ago0x67b71798881f75e94625c59ebe378ca9db6735ce  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.0001056321
0x1c98304ae9a6f4e53549de2a06a297e2bf64aee42c67ce3d67f81b2ec1a9020525 days 14 hrs ago0x3e9f41ac3068bbb232dc422ec9d2857866b24c3d  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000137781
0xd1d8f038cc49e465cbc8c4f7b1e1b2a76c5e4880a5b959555acfbc0e9605839926 days 3 hrs ago0xaec539a116fa75e8bdcf016d3c146a25bc1af93b  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000312775
0x8a15978d353b186d5be2479dd26322d9ee6d5b6d7d4d15d784caa2c5ecb0421f26 days 13 hrs ago0x415e94a5246ac4d3f16a833f51ff9066f215a421  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.0001010394
0xcc89d2750b34b41b6559a0be8891a2c8cae8697da9fe40208ca4d4bec0f057bb27 days 5 hrs ago0x4749bc73e7e65686676b84ee65b29e4681d59535  IN   0x029d0650c81817afb1810ae102708233183218780 Ether0.000229635
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 Internal Transactions as a result of Contract Execution
 Latest 25 Internal Txns, Click here to View More View All
ParentTxHash Block Age From To Value
0x70b714997304a99bb207bd5c02901a8b7c7d3890bed90d5986f2b2c37d9931d156795161 hr 34 mins ago0x029d0650c81817afb1810ae102708233183218780x341c48c0e833e179cca6c605b823e9a4911a3d000.003669759590100555 Ether
0x86c60ffec2bb4b5c079a8fa8525c0cae0b089906d9b8bcf324f9f2d36a264c7956467495 days 21 hrs ago0x029d0650c81817afb1810ae102708233183218780x6620aa7390413099623e514627a08cdbd02d73c70.001617107767342575 Ether
0x619098d4d95f15d2e4b94ebee34b1643b239c2a3f6233d7049367b549359ce3b560379113 days 11 hrs ago0x029d0650c81817afb1810ae102708233183218780x8d431f225526f9f52c6441358c44cef124a1516b0.067715255100898305 Ether
0x7ba38516bff0dafff9a473062bd28ba58569d88c12c71385899c61509f35ea94560373313 days 11 hrs ago0x029d0650c81817afb1810ae102708233183218780x1ed45acba1c716c8fbe88aa35d27842fb612e20a0.162267666038203918 Ether
0x896521c79035e233b69d92410918a8714fd9cc05c21cea183671ad9021210de7558920215 days 23 hrs ago0x029d0650c81817afb1810ae102708233183218780x3052e2dbf3c84cf0b9693ebe6a7ef1b11b93cd420.017053466921042694 Ether
0xff11c4e0ac1f0708fab5dc080fcfc6375a2ede5b6a6662bb4e0cc0c995a74df3555038622 days 18 hrs ago0x029d0650c81817afb1810ae102708233183218780x341c48c0e833e179cca6c605b823e9a4911a3d000.0036090313972712 Ether
0x6c4721fa580e5f4f2a36c85a14dc16f97b4dbc9c4fd59753d522b66497795d6a554417323 days 20 hrs ago0x029d0650c81817afb1810ae102708233183218780x415e94a5246ac4d3f16a833f51ff9066f215a4210.001541335342397662 Ether
0x8f5ba9761c0919538419de99087b6f1b6416258c7938fdbb49b0917883e80bed554353323 days 23 hrs ago0x029d0650c81817afb1810ae102708233183218780x3052e2dbf3c84cf0b9693ebe6a7ef1b11b93cd420.00134833042517113 Ether
0x95d3efaf9905dd24484afc85bbbfc91c810c40e4079e83a7cda1598812315f2e553827024 days 21 hrs ago0x029d0650c81817afb1810ae102708233183218780x415e94a5246ac4d3f16a833f51ff9066f215a4210.001442504625083726 Ether
0x5697f27aa8f22f6a7e6a055cad883acd232997cc162cba28505f3b6f512d7bc8553821524 days 21 hrs ago0x029d0650c81817afb1810ae102708233183218780x67b71798881f75e94625c59ebe378ca9db6735ce0.001051424176306595 Ether
0x1c98304ae9a6f4e53549de2a06a297e2bf64aee42c67ce3d67f81b2ec1a90205553418725 days 14 hrs ago0x029d0650c81817afb1810ae102708233183218780x3e9f41ac3068bbb232dc422ec9d2857866b24c3d0.010367637375885361 Ether
0xd1d8f038cc49e465cbc8c4f7b1e1b2a76c5e4880a5b959555acfbc0e96058399553119926 days 3 hrs ago0x029d0650c81817afb1810ae102708233183218780xaec539a116fa75e8bdcf016d3c146a25bc1af93b0.159151370663258717 Ether
0x8a15978d353b186d5be2479dd26322d9ee6d5b6d7d4d15d784caa2c5ecb0421f552880526 days 13 hrs ago0x029d0650c81817afb1810ae102708233183218780x415e94a5246ac4d3f16a833f51ff9066f215a4210.001208619175630319 Ether
0xcc89d2750b34b41b6559a0be8891a2c8cae8697da9fe40208ca4d4bec0f057bb552496327 days 5 hrs ago0x029d0650c81817afb1810ae102708233183218780x4749bc73e7e65686676b84ee65b29e4681d595350.189348180091033811 Ether
0x866116e42a0c404df67578100d3c5bd8999eb95de71d489a2f5be972618ac1d2550001331 days 12 hrs ago0x029d0650c81817afb1810ae102708233183218780x9d7007416e7ccb2c352463d42640acc6c95eda6e0.000973676812957892 Ether
0x1addc09907940f7b0b342cc30c3df50cd657947918c70e9b1d610a751c5120dc550001231 days 12 hrs ago0x029d0650c81817afb1810ae102708233183218780x9d7007416e7ccb2c352463d42640acc6c95eda6e0.000042590333407825 Ether
0xd347f7fe07cc97ffb3303e6bc3feca11cacfe6d73da1bfc258da3552fb209aa7549895131 days 17 hrs ago0x029d0650c81817afb1810ae102708233183218780x415e94a5246ac4d3f16a833f51ff9066f215a4210.001843919029894127 Ether
0xc55bb003343990dd61cbf41ea5f0bbbb2762e35d850bd8bcbd720acb8456a251549612032 days 5 hrs ago0x029d0650c81817afb1810ae102708233183218780xab8c5c034f1cd123c62413a88ef3ada2d90f68c50.172721990540199146 Ether
0x3e3c254703acc00891d8ac72acb1b3b65227d1727405c4be130e6d7e598dd04d546394437 days 17 hrs ago0x029d0650c81817afb1810ae102708233183218780x415e94a5246ac4d3f16a833f51ff9066f215a4210.000603902801453805 Ether
0x91aa264040149450985b1d6dd79cc165dee3e65f729f1379ccaa4dc234c803fe545864838 days 15 hrs ago0x029d0650c81817afb1810ae102708233183218780xea51d3fd4b4f0caf0147d4928370e6278476c9940.024962199166179975 Ether
0x904265561ad90ea9a8b61611d3331864f443e3277b341828f921792b1f7335bf545334639 days 13 hrs ago0x029d0650c81817afb1810ae102708233183218780x1014d9c68d34fb3023102762a719a578c6a85e830.002094227198412708 Ether
0x05733084ea3b1262c429e62db565ce67d036ad342f03803a2946040df6255dd2545023740 days 2 hrs ago0x029d0650c81817afb1810ae102708233183218780xab8c5c034f1cd123c62413a88ef3ada2d90f68c50.008103493500442747 Ether
0xb2651a05b59a8815db17f0de2c6aa96831810937df398b5bf7f1101110cae20c543243643 days 2 hrs ago0x029d0650c81817afb1810ae102708233183218780x2d9784fd9ab3855b534af4b5ed1a755bf1c5ffda0.055587600177480139 Ether
0x67189149dc10c3e54003fa71333b9e3aac396b13703a58d17f64057713c645ef540927146 days 23 hrs ago0x029d0650c81817afb1810ae102708233183218780x16cde506ba6ffd8163f49db6bc2dcb9892e79ddb0.012902114044429379 Ether
0x73bcd984c8c1427e11f930d33512ccb5bda8016861c77d5fda78597646b1223a540915146 days 23 hrs ago0x029d0650c81817afb1810ae102708233183218780x16cde506ba6ffd8163f49db6bc2dcb9892e79ddb0.044205516526751322 Ether
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Contract Source Code Verified (Similar match)
Note: Displaying similar matching verified source code at contract 0xc908a34165d2720d12ffcfb6b99b47161b1c9946(excluding Constructor Arguments if any)
Contract Name: EthPyramid
Compiler Version: v0.4.20-nightly.2018.1.29+commit.a668b9de
Optimization Enabled: Yes
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.18;

/*
          ,/`.
        ,'/ __`.
      ,'_/_  _ _`.
    ,'__/_ ___ _  `.
  ,'_  /___ __ _ __ `.
 '-.._/___...-"-.-..__`.
  B

 EthPyramid. A no-bullshit, transparent, self-sustaining pyramid scheme.
 
 Inspired by https://test.jochen-hoenicke.de/eth/ponzitoken/

 Developers:
	Arc
	Divine
	Norsefire
	ToCsIcK
	
 Front-End:
	Cardioth
	tenmei
	Trendium
	
 Moral Support:
	DeadCow.Rat
	Dots
	FatKreamy
	Kaseylol
	QuantumDeath666
	Quentin
 
 Shit-Tier:
	HentaiChrist
 
*/

contract EthPyramid {

	// scaleFactor is used to convert Ether into tokens and vice-versa: they're of different
	// orders of magnitude, hence the need to bridge between the two.
	uint256 constant scaleFactor = 0x10000000000000000;  // 2^64

	// CRR = 50%
	// CRR is Cash Reserve Ratio (in this case Crypto Reserve Ratio).
	// For more on this: check out https://en.wikipedia.org/wiki/Reserve_requirement
	int constant crr_n = 1; // CRR numerator
	int constant crr_d = 2; // CRR denominator

	// The price coefficient. Chosen such that at 1 token total supply
	// the amount in reserve is 0.5 ether and token price is 1 Ether.
	int constant price_coeff = -0x296ABF784A358468C;

	// Typical values that we have to declare.
	string constant public name = "EthPyramid";
	string constant public symbol = "EPY";
	uint8 constant public decimals = 18;

	// Array between each address and their number of tokens.
	mapping(address => uint256) public tokenBalance;
		
	// Array between each address and how much Ether has been paid out to it.
	// Note that this is scaled by the scaleFactor variable.
	mapping(address => int256) public payouts;

	// Variable tracking how many tokens are in existence overall.
	uint256 public totalSupply;

	// Aggregate sum of all payouts.
	// Note that this is scaled by the scaleFactor variable.
	int256 totalPayouts;

	// Variable tracking how much Ether each token is currently worth.
	// Note that this is scaled by the scaleFactor variable.
	uint256 earningsPerToken;
	
	// Current contract balance in Ether
	uint256 public contractBalance;

	function EthPyramid() public {}

	// The following functions are used by the front-end for display purposes.

	// Returns the number of tokens currently held by _owner.
	function balanceOf(address _owner) public constant returns (uint256 balance) {
		return tokenBalance[_owner];
	}

	// Withdraws all dividends held by the caller sending the transaction, updates
	// the requisite global variables, and transfers Ether back to the caller.
	function withdraw() public {
		// Retrieve the dividends associated with the address the request came from.
		var balance = dividends(msg.sender);
		
		// Update the payouts array, incrementing the request address by `balance`.
		payouts[msg.sender] += (int256) (balance * scaleFactor);
		
		// Increase the total amount that's been paid out to maintain invariance.
		totalPayouts += (int256) (balance * scaleFactor);
		
		// Send the dividends to the address that requested the withdraw.
		contractBalance = sub(contractBalance, balance);
		msg.sender.transfer(balance);
	}

	// Converts the Ether accrued as dividends back into EPY tokens without having to
	// withdraw it first. Saves on gas and potential price spike loss.
	function reinvestDividends() public {
		// Retrieve the dividends associated with the address the request came from.
		var balance = dividends(msg.sender);
		
		// Update the payouts array, incrementing the request address by `balance`.
		// Since this is essentially a shortcut to withdrawing and reinvesting, this step still holds.
		payouts[msg.sender] += (int256) (balance * scaleFactor);
		
		// Increase the total amount that's been paid out to maintain invariance.
		totalPayouts += (int256) (balance * scaleFactor);
		
		// Assign balance to a new variable.
		uint value_ = (uint) (balance);
		
		// If your dividends are worth less than 1 szabo, or more than a million Ether
		// (in which case, why are you even here), abort.
		if (value_ < 0.000001 ether || value_ > 1000000 ether)
			revert();
			
		// msg.sender is the address of the caller.
		var sender = msg.sender;
		
		// A temporary reserve variable used for calculating the reward the holder gets for buying tokens.
		// (Yes, the buyer receives a part of the distribution as well!)
		var res = reserve() - balance;

		// 10% of the total Ether sent is used to pay existing holders.
		var fee = div(value_, 10);
		
		// The amount of Ether used to purchase new tokens for the caller.
		var numEther = value_ - fee;
		
		// The number of tokens which can be purchased for numEther.
		var numTokens = calculateDividendTokens(numEther, balance);
		
		// The buyer fee, scaled by the scaleFactor variable.
		var buyerFee = fee * scaleFactor;
		
		// Check that we have tokens in existence (this should always be true), or
		// else you're gonna have a bad time.
		if (totalSupply > 0) {
			// Compute the bonus co-efficient for all existing holders and the buyer.
			// The buyer receives part of the distribution for each token bought in the
			// same way they would have if they bought each token individually.
			var bonusCoEff =
			    (scaleFactor - (res + numEther) * numTokens * scaleFactor / (totalSupply + numTokens) / numEther)
			    * (uint)(crr_d) / (uint)(crr_d-crr_n);
				
			// The total reward to be distributed amongst the masses is the fee (in Ether)
			// multiplied by the bonus co-efficient.
			var holderReward = fee * bonusCoEff;
			
			buyerFee -= holderReward;

			// Fee is distributed to all existing token holders before the new tokens are purchased.
			// rewardPerShare is the amount gained per token thanks to this buy-in.
			var rewardPerShare = holderReward / totalSupply;
			
			// The Ether value per token is increased proportionally.
			earningsPerToken += rewardPerShare;
		}
		
		// Add the numTokens which were just created to the total supply. We're a crypto central bank!
		totalSupply = add(totalSupply, numTokens);
		
		// Assign the tokens to the balance of the buyer.
		tokenBalance[sender] = add(tokenBalance[sender], numTokens);
		
		// Update the payout array so that the buyer cannot claim dividends on previous purchases.
		// Also include the fee paid for entering the scheme.
		// First we compute how much was just paid out to the buyer...
		var payoutDiff  = (int256) ((earningsPerToken * numTokens) - buyerFee);
		
		// Then we update the payouts array for the buyer with this amount...
		payouts[sender] += payoutDiff;
		
		// And then we finally add it to the variable tracking the total amount spent to maintain invariance.
		totalPayouts    += payoutDiff;
		
	}

	// Sells your tokens for Ether. This Ether is assigned to the callers entry
	// in the tokenBalance array, and therefore is shown as a dividend. A second
	// call to withdraw() must be made to invoke the transfer of Ether back to your address.
	function sellMyTokens() public {
		var balance = balanceOf(msg.sender);
		sell(balance);
	}

	// The slam-the-button escape hatch. Sells the callers tokens for Ether, then immediately
	// invokes the withdraw() function, sending the resulting Ether to the callers address.
    function getMeOutOfHere() public {
		sellMyTokens();
        withdraw();
	}

	// Gatekeeper function to check if the amount of Ether being sent isn't either
	// too small or too large. If it passes, goes direct to buy().
	function fund() payable public {
		// Don't allow for funding if the amount of Ether sent is less than 1 szabo.
		if (msg.value > 0.000001 ether) {
		    contractBalance = add(contractBalance, msg.value);
			buy();
		} else {
			revert();
		}
    }

	// Function that returns the (dynamic) price of buying a finney worth of tokens.
	function buyPrice() public constant returns (uint) {
		return getTokensForEther(1 finney);
	}

	// Function that returns the (dynamic) price of selling a single token.
	function sellPrice() public constant returns (uint) {
        var eth = getEtherForTokens(1 finney);
        var fee = div(eth, 10);
        return eth - fee;
    }

	// Calculate the current dividends associated with the caller address. This is the net result
	// of multiplying the number of tokens held by their current value in Ether and subtracting the
	// Ether that has already been paid out.
	function dividends(address _owner) public constant returns (uint256 amount) {
		return (uint256) ((int256)(earningsPerToken * tokenBalance[_owner]) - payouts[_owner]) / scaleFactor;
	}

	// Version of withdraw that extracts the dividends and sends the Ether to the caller.
	// This is only used in the case when there is no transaction data, and that should be
	// quite rare unless interacting directly with the smart contract.
	function withdrawOld(address to) public {
		// Retrieve the dividends associated with the address the request came from.
		var balance = dividends(msg.sender);
		
		// Update the payouts array, incrementing the request address by `balance`.
		payouts[msg.sender] += (int256) (balance * scaleFactor);
		
		// Increase the total amount that's been paid out to maintain invariance.
		totalPayouts += (int256) (balance * scaleFactor);
		
		// Send the dividends to the address that requested the withdraw.
		contractBalance = sub(contractBalance, balance);
		to.transfer(balance);		
	}

	// Internal balance function, used to calculate the dynamic reserve value.
	function balance() internal constant returns (uint256 amount) {
		// msg.value is the amount of Ether sent by the transaction.
		return contractBalance - msg.value;
	}

	function buy() internal {
		// Any transaction of less than 1 szabo is likely to be worth less than the gas used to send it.
		if (msg.value < 0.000001 ether || msg.value > 1000000 ether)
			revert();
						
		// msg.sender is the address of the caller.
		var sender = msg.sender;
		
		// 10% of the total Ether sent is used to pay existing holders.
		var fee = div(msg.value, 10);
		
		// The amount of Ether used to purchase new tokens for the caller.
		var numEther = msg.value - fee;
		
		// The number of tokens which can be purchased for numEther.
		var numTokens = getTokensForEther(numEther);
		
		// The buyer fee, scaled by the scaleFactor variable.
		var buyerFee = fee * scaleFactor;
		
		// Check that we have tokens in existence (this should always be true), or
		// else you're gonna have a bad time.
		if (totalSupply > 0) {
			// Compute the bonus co-efficient for all existing holders and the buyer.
			// The buyer receives part of the distribution for each token bought in the
			// same way they would have if they bought each token individually.
			var bonusCoEff =
			    (scaleFactor - (reserve() + numEther) * numTokens * scaleFactor / (totalSupply + numTokens) / numEther)
			    * (uint)(crr_d) / (uint)(crr_d-crr_n);
				
			// The total reward to be distributed amongst the masses is the fee (in Ether)
			// multiplied by the bonus co-efficient.
			var holderReward = fee * bonusCoEff;
			
			buyerFee -= holderReward;

			// Fee is distributed to all existing token holders before the new tokens are purchased.
			// rewardPerShare is the amount gained per token thanks to this buy-in.
			var rewardPerShare = holderReward / totalSupply;
			
			// The Ether value per token is increased proportionally.
			earningsPerToken += rewardPerShare;
			
		}

		// Add the numTokens which were just created to the total supply. We're a crypto central bank!
		totalSupply = add(totalSupply, numTokens);

		// Assign the tokens to the balance of the buyer.
		tokenBalance[sender] = add(tokenBalance[sender], numTokens);

		// Update the payout array so that the buyer cannot claim dividends on previous purchases.
		// Also include the fee paid for entering the scheme.
		// First we compute how much was just paid out to the buyer...
		var payoutDiff = (int256) ((earningsPerToken * numTokens) - buyerFee);
		
		// Then we update the payouts array for the buyer with this amount...
		payouts[sender] += payoutDiff;
		
		// And then we finally add it to the variable tracking the total amount spent to maintain invariance.
		totalPayouts    += payoutDiff;
		
	}

	// Sell function that takes tokens and converts them into Ether. Also comes with a 10% fee
	// to discouraging dumping, and means that if someone near the top sells, the fee distributed
	// will be *significant*.
	function sell(uint256 amount) internal {
	    // Calculate the amount of Ether that the holders tokens sell for at the current sell price.
		var numEthersBeforeFee = getEtherForTokens(amount);
		
		// 10% of the resulting Ether is used to pay remaining holders.
        var fee = div(numEthersBeforeFee, 10);
		
		// Net Ether for the seller after the fee has been subtracted.
        var numEthers = numEthersBeforeFee - fee;
		
		// *Remove* the numTokens which were just sold from the total supply. We're /definitely/ a crypto central bank.
		totalSupply = sub(totalSupply, amount);
		
        // Remove the tokens from the balance of the buyer.
		tokenBalance[msg.sender] = sub(tokenBalance[msg.sender], amount);

        // Update the payout array so that the seller cannot claim future dividends unless they buy back in.
		// First we compute how much was just paid out to the seller...
		var payoutDiff = (int256) (earningsPerToken * amount + (numEthers * scaleFactor));
		
        // We reduce the amount paid out to the seller (this effectively resets their payouts value to zero,
		// since they're selling all of their tokens). This makes sure the seller isn't disadvantaged if
		// they decide to buy back in.
		payouts[msg.sender] -= payoutDiff;		
		
		// Decrease the total amount that's been paid out to maintain invariance.
        totalPayouts -= payoutDiff;
		
		// Check that we have tokens in existence (this is a bit of an irrelevant check since we're
		// selling tokens, but it guards against division by zero).
		if (totalSupply > 0) {
			// Scale the Ether taken as the selling fee by the scaleFactor variable.
			var etherFee = fee * scaleFactor;
			
			// Fee is distributed to all remaining token holders.
			// rewardPerShare is the amount gained per token thanks to this sell.
			var rewardPerShare = etherFee / totalSupply;
			
			// The Ether value per token is increased proportionally.
			earningsPerToken = add(earningsPerToken, rewardPerShare);
		}
	}
	
	// Dynamic value of Ether in reserve, according to the CRR requirement.
	function reserve() internal constant returns (uint256 amount) {
		return sub(balance(),
			 ((uint256) ((int256) (earningsPerToken * totalSupply) - totalPayouts) / scaleFactor));
	}

	// Calculates the number of tokens that can be bought for a given amount of Ether, according to the
	// dynamic reserve and totalSupply values (derived from the buy and sell prices).
	function getTokensForEther(uint256 ethervalue) public constant returns (uint256 tokens) {
		return sub(fixedExp(fixedLog(reserve() + ethervalue)*crr_n/crr_d + price_coeff), totalSupply);
	}

	// Semantically similar to getTokensForEther, but subtracts the callers balance from the amount of Ether returned for conversion.
	function calculateDividendTokens(uint256 ethervalue, uint256 subvalue) public constant returns (uint256 tokens) {
		return sub(fixedExp(fixedLog(reserve() - subvalue + ethervalue)*crr_n/crr_d + price_coeff), totalSupply);
	}

	// Converts a number tokens into an Ether value.
	function getEtherForTokens(uint256 tokens) public constant returns (uint256 ethervalue) {
		// How much reserve Ether do we have left in the contract?
		var reserveAmount = reserve();

		// If you're the Highlander (or bagholder), you get The Prize. Everything left in the vault.
		if (tokens == totalSupply)
			return reserveAmount;

		// If there would be excess Ether left after the transaction this is called within, return the Ether
		// corresponding to the equation in Dr Jochen Hoenicke's original Ponzi paper, which can be found
		// at https://test.jochen-hoenicke.de/eth/ponzitoken/ in the third equation, with the CRR numerator 
		// and denominator altered to 1 and 2 respectively.
		return sub(reserveAmount, fixedExp((fixedLog(totalSupply - tokens) - price_coeff) * crr_d/crr_n));
	}

	// You don't care about these, but if you really do they're hex values for 
	// co-efficients used to simulate approximations of the log and exp functions.
	int256  constant one        = 0x10000000000000000;
	uint256 constant sqrt2      = 0x16a09e667f3bcc908;
	uint256 constant sqrtdot5   = 0x0b504f333f9de6484;
	int256  constant ln2        = 0x0b17217f7d1cf79ac;
	int256  constant ln2_64dot5 = 0x2cb53f09f05cc627c8;
	int256  constant c1         = 0x1ffffffffff9dac9b;
	int256  constant c3         = 0x0aaaaaaac16877908;
	int256  constant c5         = 0x0666664e5e9fa0c99;
	int256  constant c7         = 0x049254026a7630acf;
	int256  constant c9         = 0x038bd75ed37753d68;
	int256  constant c11        = 0x03284a0c14610924f;

	// The polynomial R = c1*x + c3*x^3 + ... + c11 * x^11
	// approximates the function log(1+x)-log(1-x)
	// Hence R(s) = log((1+s)/(1-s)) = log(a)
	function fixedLog(uint256 a) internal pure returns (int256 log) {
		int32 scale = 0;
		while (a > sqrt2) {
			a /= 2;
			scale++;
		}
		while (a <= sqrtdot5) {
			a *= 2;
			scale--;
		}
		int256 s = (((int256)(a) - one) * one) / ((int256)(a) + one);
		var z = (s*s) / one;
		return scale * ln2 +
			(s*(c1 + (z*(c3 + (z*(c5 + (z*(c7 + (z*(c9 + (z*c11/one))
				/one))/one))/one))/one))/one);
	}

	int256 constant c2 =  0x02aaaaaaaaa015db0;
	int256 constant c4 = -0x000b60b60808399d1;
	int256 constant c6 =  0x0000455956bccdd06;
	int256 constant c8 = -0x000001b893ad04b3a;
	
	// The polynomial R = 2 + c2*x^2 + c4*x^4 + ...
	// approximates the function x*(exp(x)+1)/(exp(x)-1)
	// Hence exp(x) = (R(x)+x)/(R(x)-x)
	function fixedExp(int256 a) internal pure returns (uint256 exp) {
		int256 scale = (a + (ln2_64dot5)) / ln2 - 64;
		a -= scale*ln2;
		int256 z = (a*a) / one;
		int256 R = ((int256)(2) * one) +
			(z*(c2 + (z*(c4 + (z*(c6 + (z*c8/one))/one))/one))/one);
		exp = (uint256) (((R + a) * one) / (R - a));
		if (scale >= 0)
			exp <<= scale;
		else
			exp >>= -scale;
		return exp;
	}
	
	// The below are safemath implementations of the four arithmetic operators
	// designed to explicitly prevent over- and under-flows of integer values.

	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;
	}

	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;
	}

	function sub(uint256 a, uint256 b) internal pure returns (uint256) {
		assert(b <= a);
		return a - b;
	}

	function add(uint256 a, uint256 b) internal pure returns (uint256) {
		uint256 c = a + b;
		assert(c >= a);
		return c;
	}

	// This allows you to buy tokens by sending Ether directly to the smart contract
	// without including any transaction data (useful for, say, mobile wallet apps).
	function () payable public {
		// msg.value is the amount of Ether sent by the transaction.
		if (msg.value > 0) {
			fund();
		} else {
			withdrawOld(msg.sender);
		}
	}
}

    Contract ABI  
[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"}],"name":"withdrawOld","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"sellPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"ethervalue","type":"uint256"}],"name":"getTokensForEther","outputs":[{"name":"tokens","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"payouts","outputs":[{"name":"","type":"int256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"dividends","outputs":[{"name":"amount","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"buyPrice","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"contractBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"reinvestDividends","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"getMeOutOfHere","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"fund","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"tokens","type":"uint256"}],"name":"getEtherForTokens","outputs":[{"name":"ethervalue","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"ethervalue","type":"uint256"},{"name":"subvalue","type":"uint256"}],"name":"calculateDividendTokens","outputs":[{"name":"tokens","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"sellMyTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"tokenBalance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"}]

  Contract Creation Code Switch To Opcodes View
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

   Swarm Source:
bzzr://6c7d107dcbe6f00e6ccb3d36b76f1e1c60de2a3c015200fad50d432f2f7f92f3

 

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