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Block
From
To
Resolve Prior Be...70495322019-01-11 19:07:392249 days ago1547233659IN
0x3eD5c335...64291Dd20
0 ETH0.000085392
Resolve Prior Be...69867002018-12-31 16:28:132261 days ago1546273693IN
0x3eD5c335...64291Dd20
0 ETH0.000175014
Resolve Prior Be...69788022018-12-30 8:00:452262 days ago1546156845IN
0x3eD5c335...64291Dd20
0 ETH0.0004375310
Resolve Prior Be...69416172018-12-24 1:42:272268 days ago1545615747IN
0x3eD5c335...64291Dd20
0 ETH0.000218755
Resolve Prior Be...67624312018-11-24 6:49:222298 days ago1543042162IN
0x3eD5c335...64291Dd20
0 ETH0.000101382.374556
Resolve Prior Be...66729562018-11-09 14:49:172313 days ago1541774957IN
0x3eD5c335...64291Dd20
0 ETH0.000170783
Resolve Prior Be...66161922018-10-31 7:09:342322 days ago1540969774IN
0x3eD5c335...64291Dd20
0 ETH0.000224735
Resolve Prior Be...66104742018-10-30 8:51:442323 days ago1540889504IN
0x3eD5c335...64291Dd20
0 ETH0.000095124.3
Resolve Prior Be...66104572018-10-30 8:47:302323 days ago1540889250IN
0x3eD5c335...64291Dd20
0 ETH0.000170794
Place Bet Eth66084192018-10-30 0:38:222323 days ago1540859902IN
0x3eD5c335...64291Dd20
0.0001 ETH0.000381942
Place Bet Eth66084072018-10-30 0:33:532323 days ago1540859633IN
0x3eD5c335...64291Dd20
0.0001 ETH0.000299642
Resolve Prior Be...66030492018-10-29 3:35:522324 days ago1540784152IN
0x3eD5c335...64291Dd20
0 ETH0.000256186
Resolve Prior Be...65885592018-10-26 18:38:122326 days ago1540579092IN
0x3eD5c335...64291Dd20
0 ETH0.000256186
Resolve Prior Be...65863352018-10-26 9:53:562327 days ago1540547636IN
0x3eD5c335...64291Dd20
0 ETH0.000341588
Resolve Prior Be...65788672018-10-25 4:39:222328 days ago1540442362IN
0x3eD5c335...64291Dd20
0 ETH0.000341588
Resolve Prior Be...65771352018-10-24 21:49:182328 days ago1540417758IN
0x3eD5c335...64291Dd20
0 ETH0.000306257
Resolve Prior Be...65696582018-10-23 16:39:082330 days ago1540312748IN
0x3eD5c335...64291Dd20
0 ETH0.00011325
Resolve Prior Be...65654192018-10-23 0:06:242330 days ago1540253184IN
0x3eD5c335...64291Dd20
0 ETH0.00009822.3
Resolve Prior Be...65541002018-10-21 3:33:162332 days ago1540092796IN
0x3eD5c335...64291Dd20
0 ETH0.000213485
Resolve Prior Be...65507732018-10-20 14:34:592333 days ago1540046099IN
0x3eD5c335...64291Dd20
0 ETH0.000250484.4
Resolve Prior Be...65472552018-10-20 0:46:372333 days ago1539996397IN
0x3eD5c335...64291Dd20
0 ETH0.000067923
Resolve Prior Be...65472172018-10-20 0:37:232333 days ago1539995843IN
0x3eD5c335...64291Dd20
0 ETH0.000131253
Resolve Prior Be...65465892018-10-19 22:07:582333 days ago1539986878IN
0x3eD5c335...64291Dd20
0 ETH0.00035256
Resolve Prior Be...65459082018-10-19 19:24:422333 days ago1539977082IN
0x3eD5c335...64291Dd20
0 ETH0.000178853.1
Resolve Prior Be...65458982018-10-19 19:22:162333 days ago1539976936IN
0x3eD5c335...64291Dd20
0 ETH0.000141744
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Latest 4 internal transactions

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From
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Transfer66084192018-10-30 0:38:222323 days ago1540859902
0x3eD5c335...64291Dd20
0.0001 ETH
Transfer66084072018-10-30 0:33:532323 days ago1540859633
0x3eD5c335...64291Dd20
0.0001 ETH
Transfer64876822018-10-10 7:43:462343 days ago1539157426
0x3eD5c335...64291Dd20
0.011 ETH
Transfer64846462018-10-09 20:11:072343 days ago1539115867
0x3eD5c335...64291Dd20
0.01 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
VRFBet

Compiler Version
v0.4.25+commit.59dbf8f1

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2018-10-09
*/

pragma solidity ^0.4.24;

contract AutomatedExchange{
  function buyTokens() public payable;
  function calculateTokenSell(uint256 tokens) public view returns(uint256);
  function calculateTokenBuy(uint256 eth,uint256 contractBalance) public view returns(uint256);
  function balanceOf(address tokenOwner) public view returns (uint balance);
}
contract VerifyToken {
    function totalSupply() public constant returns (uint);
    function balanceOf(address tokenOwner) public constant returns (uint balance);
    function allowance(address tokenOwner, address spender) public constant returns (uint remaining);
    function transfer(address to, uint tokens) public returns (bool success);
    function approve(address spender, uint tokens) public returns (bool success);
    function transferFrom(address from, address to, uint tokens) public returns (bool success);
    bool public activated;

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract ApproveAndCallFallBack {
    function receiveApproval(address from, uint256 tokens, address token, bytes data) public;
}
contract VRFBet is ApproveAndCallFallBack{
  using SafeMath for uint;
  struct Bet{
    uint blockPlaced;
    address bettor;
    uint betAmount;
  }
  mapping(address => bytes) public victoryMessages;
  mapping(uint => Bet) public betQueue;
  uint public MAX_SIMULTANEOUS_BETS=20;
  uint public index=0;//index for processing bets
  uint public indexBetPlace=0;//index for placing bets
  address vrfAddress= 0x5BD574410F3A2dA202bABBa1609330Db02aD64C2;//0xe0832c4f024D2427bBC6BD0C4931096d2ab5CCaF; //0x5BD574410F3A2dA202bABBa1609330Db02aD64C2;
  VerifyToken vrfcontract=VerifyToken(vrfAddress);
  AutomatedExchange exchangecontract=AutomatedExchange(0x48bF5e13A1ee8Bd4385C182904B3ABf73E042675);

  event Payout(address indexed to, uint tokens);
  event BetFinalized(address indexed bettor,uint tokensWagered,uint tokensAgainst,uint tokensWon,bytes victoryMessage);

  //Send tokens with ApproveAndCallFallBack, place a bet
  function receiveApproval(address from, uint256 tokens, address token, bytes data) public{
      require(msg.sender==vrfAddress);
      vrfcontract.transferFrom(from,this,tokens);
      _placeBet(tokens,from,data);
  }
  function placeBetEth(bytes victoryMessage) public payable{
    require(indexBetPlace-index<MAX_SIMULTANEOUS_BETS);//ensures you don't get a situation where there are too many existing bets to process, locking VRF in the contract
    uint tokensBefore=vrfcontract.balanceOf(this);
    exchangecontract.buyTokens.value(msg.value)();
    _placeBet(vrfcontract.balanceOf(this).sub(tokensBefore),msg.sender,victoryMessage);
  }
  function payout(address to,uint numTokens) private{
    vrfcontract.transfer(to,numTokens);
    emit Payout(to,numTokens);
  }
  function _placeBet(uint numTokens,address from,bytes victoryMessage) private{
    resolvePriorBets();
    betQueue[indexBetPlace]=Bet({blockPlaced:block.number,bettor:from,betAmount:numTokens});
    indexBetPlace+=1;
    victoryMessages[from]=victoryMessage;
  }
  function resolvePriorBets() public{
    while(betQueue[index].blockPlaced!=0){
      if(betQueue[index+1].blockPlaced!=0){
        if(betQueue[index+1].blockPlaced+250>block.number){//bet is not expired
          if(block.number>betQueue[index+1].blockPlaced){//bet was in the past, future blockhash can be safely used to compute random

          /*
            Bet is between two players.
            Outcome is computed as whether rand(bet1+bet2)<bet1. This makes the probability of winning proportional to the size of your bet, ensuring all bets are EV neutral.
          */
            uint totalbet=betQueue[index].betAmount+betQueue[index+1].betAmount;
            uint randval= random(totalbet,betQueue[index+1].blockPlaced,betQueue[index+1].bettor);
            if(randval < betQueue[index].betAmount){
              payout(betQueue[index].bettor,totalbet);
              emit BetFinalized(betQueue[index+1].bettor,betQueue[index+1].betAmount,betQueue[index].betAmount,0,victoryMessages[betQueue[index].bettor]);
              emit BetFinalized(betQueue[index].bettor,betQueue[index].betAmount,betQueue[index+1].betAmount,totalbet,victoryMessages[betQueue[index].bettor]);
            }
            else{
              payout(betQueue[index+1].bettor,totalbet);
              emit BetFinalized(betQueue[index+1].bettor,betQueue[index+1].betAmount,betQueue[index].betAmount,totalbet,victoryMessages[betQueue[index+1].bettor]);
              emit BetFinalized(betQueue[index].bettor,betQueue[index].betAmount,betQueue[index+1].betAmount,0,victoryMessages[betQueue[index+1].bettor]);
            }
            index+=2;
          }
          else{ //bet is in the current block, cannot be resolved, no point in continuing the loop
            return;
          }
        }
        else{//bet has expired, return tokens to users
          payout(betQueue[index+1].bettor,betQueue[index+1].betAmount);
          payout(betQueue[index].bettor,betQueue[index].betAmount);
          index+=2;
          emit BetFinalized(betQueue[index].bettor,betQueue[index].betAmount,betQueue[index+1].betAmount,betQueue[index].betAmount,"");
          emit BetFinalized(betQueue[index+1].bettor,betQueue[index+1].betAmount,betQueue[index].betAmount,betQueue[index+1].betAmount,"");
        }
      }
      else{ //single bet with no other to pair it to, must wait for another bet
        return;
      }
    }
  }
  function cancelBet() public{
    resolvePriorBets();
    require(indexBetPlace-index==1 && betQueue[index].bettor==msg.sender);
    index+=1;//skip the last remaining bet
  }
  /*
    requires an odd number of bets and your bet is the last one
  */
  function canCancelBet() public view returns(bool){
    return indexBetPlace>0 && !isEven(indexBetPlace-index) && betQueue[indexBetPlace-1].bettor==msg.sender;
  }
  function isEven(uint num) public view returns(bool){
    return 2*(num/2)==num;
  }
  function maxRandom(uint blockn, address entropy)
    internal
    returns (uint256 randomNumber)
  {
      return uint256(keccak256(
          abi.encodePacked(
            blockhash(blockn),
            entropy)
      ));
  }
  function random(uint256 upper, uint256 blockn, address entropy)
    internal
    returns (uint256 randomNumber)
  {
      return maxRandom(blockn, entropy) % upper + 1;
  }
  /*
    only for frontend viewing purposes
  */
  function getBetState(address bettor) public view returns(uint){
    for(uint i=index;i<indexBetPlace;i++){
      if(betQueue[i].bettor==bettor){
        if(!isEven(indexBetPlace-index)){//i<indexBetPlace-1){
          return 1;
        }
        else{
          return 2;
        }
      }
    }
    return 0;
  }
}
// ----------------------------------------------------------------------------
// Safe maths
// ----------------------------------------------------------------------------
library SafeMath {
    function add(uint a, uint b) internal pure returns (uint c) {
        c = a + b;
        require(c >= a);
    }
    function sub(uint a, uint b) internal pure returns (uint c) {
        require(b <= a);
        c = a - b;
    }
    function mul(uint a, uint b) internal pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b);
    }
    function div(uint a, uint b) internal pure returns (uint c) {
        require(b > 0);
        c = a / b;
    }
}

Contract Security Audit

Contract ABI

API
[{"constant":true,"inputs":[],"name":"index","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"victoryMessages","outputs":[{"name":"","type":"bytes"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"num","type":"uint256"}],"name":"isEven","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"cancelBet","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"bettor","type":"address"}],"name":"getBetState","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"from","type":"address"},{"name":"tokens","type":"uint256"},{"name":"token","type":"address"},{"name":"data","type":"bytes"}],"name":"receiveApproval","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"betQueue","outputs":[{"name":"blockPlaced","type":"uint256"},{"name":"bettor","type":"address"},{"name":"betAmount","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"victoryMessage","type":"bytes"}],"name":"placeBetEth","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"canCancelBet","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"indexBetPlace","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"resolvePriorBets","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"MAX_SIMULTANEOUS_BETS","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Payout","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"bettor","type":"address"},{"indexed":false,"name":"tokensWagered","type":"uint256"},{"indexed":false,"name":"tokensAgainst","type":"uint256"},{"indexed":false,"name":"tokensWon","type":"uint256"},{"indexed":false,"name":"victoryMessage","type":"bytes"}],"name":"BetFinalized","type":"event"}]

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bzzr://223385bc6a5db3261a26efa0b5e7f488b982b0347206ff563addf2edcb0f77c6

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