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Balance: 0 Ether
Ether Value: $0
Transactions: 17283 txns
Token Tracker: Lira Cash (LIRA)
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Contract Creator: 0x608e9e5fa55e13cd245c7a624308321dd541519eat txn 0xec9c20baae849c0983b927bace4a7b9cdc89a6cace62e651c232c7f0cd0c2875
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Contract Source Code Verified (Exact Match)
Contract Name: Lira
Compiler Text: v0.4.25+commit.59dbf8f1
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.18;

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;
  }
}

library ExtendedMath {

  //return the smaller of the two inputs (a or b)
  function limitLessThan(uint a, uint b) internal pure returns (uint c) {
    if(a > b) return b;
    return a;
  }
}

contract ERC20Interface {
  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);
  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 Owned {

  address public owner;
  address public newOwner;
  event OwnershipTransferred(address indexed _from, address indexed _to);

  function Owned() public {
    owner = msg.sender;
  }

  modifier onlyOwner {
    require(msg.sender == owner);
    _;
  }

  function transferOwnership(address _newOwner) public onlyOwner {
    newOwner = _newOwner;
  }

  function acceptOwnership() public {
    require(msg.sender == newOwner);
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
    newOwner = address(0);
  }
}

contract Lira is ERC20Interface, Owned {

  bool locked = false;
  bytes32 public challengeNumber;
  address public lastRewardTo;
  using SafeMath for uint;
  using ExtendedMath for uint;
  string public symbol;
  string public  name;
  uint8 public decimals;
  uint public _totalSupply;
  uint public latestDifficultyPeriodStarted;
  uint public epochCount; // Blocks mined
  uint public _BLOCKS_PER_READJUSTMENT = 1024;
  uint public  _MINIMUM_TARGET = 2**16;
  uint public  _MAXIMUM_TARGET = 2**234;
  uint public miningTarget;
  uint public rewardEra;
  uint public maxSupplyForEra;
  uint public lastRewardAmount;
  uint public lastRewardEthBlockNumber;
  uint public tokensMinted;

  mapping(bytes32 => bytes32) solutionForChallenge;
  mapping(address => uint) balances;
  mapping(address => mapping(address => uint)) allowed;

  event Mint(address indexed from, uint reward_amount, uint epochCount, bytes32 newChallengeNumber);

  function Lira() public onlyOwner{

    symbol = "LIRA";
    name = "Lira Cash";
    decimals = 8;

    _totalSupply = 21000000 * 10**uint(decimals);

    if(locked) revert();
    locked = true;
    tokensMinted = 0;
    rewardEra = 0;
    maxSupplyForEra = _totalSupply.div(2);
    miningTarget = _MAXIMUM_TARGET;
    latestDifficultyPeriodStarted = block.number;
    _startNewMiningEpoch();

  }

  function mint(uint256 nonce, bytes32 challenge_digest) public returns (bool success) {

    bytes32 digest =  keccak256(challengeNumber, msg.sender, nonce );

    if (digest != challenge_digest) revert();
    if(uint256(digest) > miningTarget) revert();

    bytes32 solution = solutionForChallenge[challengeNumber];
    solutionForChallenge[challengeNumber] = digest;

    // Prevent duplicate answers and duplicate rewards
    if(solution != 0x0) revert();

    uint reward_amount = getMiningReward();
    balances[msg.sender] = balances[msg.sender].add(reward_amount);
    tokensMinted = tokensMinted.add(reward_amount);
    assert(tokensMinted <= maxSupplyForEra);

    lastRewardTo = msg.sender;
    lastRewardAmount = reward_amount;
    lastRewardEthBlockNumber = block.number;
    _startNewMiningEpoch();

    Mint(msg.sender, reward_amount, epochCount, challengeNumber );
    return true;
  }

  function _startNewMiningEpoch() internal {

    if( tokensMinted.add(getMiningReward()) > maxSupplyForEra && rewardEra < 39){
      rewardEra = rewardEra + 1;
    }

    maxSupplyForEra = _totalSupply - _totalSupply.div( 2**(rewardEra + 1));
    epochCount = epochCount.add(1);

    if(epochCount % _BLOCKS_PER_READJUSTMENT == 0){
      _reAdjustDifficulty();
    }

    challengeNumber = block.blockhash(block.number - 1);

  }

  function _reAdjustDifficulty() internal {

    uint ethBlocksSinceLastDifficultyPeriod = block.number - latestDifficultyPeriodStarted;
    uint epochsMined = _BLOCKS_PER_READJUSTMENT; //256
    uint targetEthBlocksPerDiffPeriod = epochsMined * 60;

    if( ethBlocksSinceLastDifficultyPeriod < targetEthBlocksPerDiffPeriod ){
      uint excess_block_pct = (targetEthBlocksPerDiffPeriod.mul(100)).div( ethBlocksSinceLastDifficultyPeriod );
      uint excess_block_pct_extra = excess_block_pct.sub(100).limitLessThan(1000);
      miningTarget = miningTarget.sub(miningTarget.div(2000).mul(excess_block_pct_extra));
    } else {
      uint shortage_block_pct = (ethBlocksSinceLastDifficultyPeriod.mul(100)).div( targetEthBlocksPerDiffPeriod );
      uint shortage_block_pct_extra = shortage_block_pct.sub(100).limitLessThan(1000);
      miningTarget = miningTarget.add(miningTarget.div(2000).mul(shortage_block_pct_extra));
    }

    latestDifficultyPeriodStarted = block.number;

    if(miningTarget < _MINIMUM_TARGET){
      miningTarget = _MINIMUM_TARGET;
    }

    if(miningTarget > _MAXIMUM_TARGET){
      miningTarget = _MAXIMUM_TARGET;
    }
  }

  function getChallengeNumber() public constant returns (bytes32) {
    return challengeNumber;
  }

  function getMiningDifficulty() public constant returns (uint) {
    return _MAXIMUM_TARGET.div(miningTarget);
  }

  function getMiningTarget() public constant returns (uint) {
    return miningTarget;
  }

  function getMiningReward() public constant returns (uint) {
    return (50 * 10**uint(decimals) ).div( 2**rewardEra ) ;
  }

  function getMintDigest(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number) public view returns (bytes32 digesttest) {
    bytes32 digest = keccak256(challenge_number,msg.sender,nonce);
    return digest;
  }

  function checkMintSolution(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number, uint testTarget) public view returns (bool success) {
    bytes32 digest = keccak256(challenge_number,msg.sender,nonce);
    if(uint256(digest) > testTarget) revert();
    return (digest == challenge_digest);
  }

  function totalSupply() public constant returns (uint) {
    return _totalSupply  - balances[address(0)];
  }

  function balanceOf(address tokenOwner) public constant returns (uint balance) {
    return balances[tokenOwner];
  }

  function transfer(address to, uint tokens) public returns (bool success) {
    balances[msg.sender] = balances[msg.sender].sub(tokens);
    balances[to] = balances[to].add(tokens);
    Transfer(msg.sender, to, tokens);
    return true;
  }

  function transferExtra(address to, uint tokens, uint extra) public returns (bool success) {
    balances[msg.sender] = balances[msg.sender].sub(tokens);
    balances[to] = balances[to].add(tokens);
    Transfer(msg.sender, to, tokens);
    return true;
  }

  function approve(address spender, uint tokens) public returns (bool success) {
    allowed[msg.sender][spender] = tokens;
    Approval(msg.sender, spender, tokens);
    return true;
  }

  function transferFrom(address from, address to, uint tokens) public returns (bool success) {
    balances[from] = balances[from].sub(tokens);
    allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
    balances[to] = balances[to].add(tokens);
    Transfer(from, to, tokens);
    return true;
  }

  function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {
    return allowed[tokenOwner][spender];
  }

  function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {
    allowed[msg.sender][spender] = tokens;
    Approval(msg.sender, spender, tokens);
    ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
    return true;
  }

  function () public payable {
    revert();
  }

  function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {
    return ERC20Interface(tokenAddress).transfer(owner, tokens);
  }

}

    Contract ABI  
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puts":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"spender","type":"address"},{"name":"tokens","type":"uint256"},{"name":"data","type":"bytes"}],"name":"approveAndCall","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"latestDifficultyPeriodStarted","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"newOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenAddress","type":"address"},{"name":"tokens","type":"uint256"}],"name":"transferAnyERC20Token","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"_MINIMUM_TARGET","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"tokenOwner","type":"address"},{"name":"spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"tokens","type":"uint256"},{"name":"extra","type":"uint256"}],"name":"transferExtra","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":false,"name":"reward_amount","type":"uint256"},{"indexed":false,"name":"epochCount","type":"uint256"},{"indexed":false,"name":"newChallengeNumber","type":"bytes32"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"tokenOwner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"tokens","type":"uint256"}],"name":"Approval","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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   Swarm Source:
bzzr://9cac524364b9e1cc33903644a68dc175eb2dd42fece7027a0ff3fc648af2be7e

 

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