ERC-20
Overview
Max Total Supply
48,358,454.8611111111111 PB
Holders
116
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
1,337 PBValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
PartialBasic
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-05-24 */ pragma solidity ^0.4.21; /** * @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 c) { if (a == 0) { return 0; } 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 a / b; } /** * @dev Subtracts 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 c) { c = a + b; assert(c >= a); return c; } } /** * @title ERC20Basic * @dev Simpler version of ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/179 */ contract ERC20Basic { function totalSupply() public view returns (uint256); function balanceOf(address who) public view returns (uint256); function transfer(address to, uint256 value) public returns (bool); event Transfer(address indexed from, address indexed to, uint256 value); } /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public view returns (uint256); function transferFrom(address from, address to, uint256 value) public returns (bool); function approve(address spender, uint256 value) public returns (bool); event Approval(address indexed owner, address indexed spender, uint256 value); } /** * @title Basic token * @dev Basic version of StandardToken, with no allowances. */ contract BasicToken is ERC20Basic { using SafeMath for uint256; mapping(address => uint256) balances; } /** * @title Standard ERC20 token * * @dev Implementation of the basic standard token. * @dev https://github.com/ethereum/EIPs/issues/20 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol */ contract StandardToken is ERC20, BasicToken { mapping (address => mapping (address => uint256)) internal allowed; /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * * Beware that changing an allowance with this method brings the risk that someone may use both the old * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * @param _spender The address which will spend the funds. * @param _value The amount of tokens to be spent. */ function approve(address _spender, uint256 _value) public returns (bool) { allowed[msg.sender][_spender] = _value; emit Approval(msg.sender, _spender, _value); return true; } /** * @dev Increase the amount of tokens that an owner allowed to a spender. * * approve should be called when allowed[_spender] == 0. To increment * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * @param _spender The address which will spend the funds. * @param _addedValue The amount of tokens to increase the allowance by. */ function increaseApproval(address _spender, uint _addedValue) public returns (bool) { allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue); emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); return true; } /** * @dev Decrease the amount of tokens that an owner allowed to a spender. * * approve should be called when allowed[_spender] == 0. To decrement * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * @param _spender The address which will spend the funds. * @param _subtractedValue The amount of tokens to decrease the allowance by. */ function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) { uint oldValue = allowed[msg.sender][_spender]; if (_subtractedValue > oldValue) { allowed[msg.sender][_spender] = 0; } else { allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue); } emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); return true; } /** * @dev Function to check the amount of tokens that an owner allowed to a spender. * @param _owner address The address which owns the funds. * @param _spender address The address which will spend the funds. * @return A uint256 specifying the amount of tokens still available for the spender. */ function allowance(address _owner, address _spender) public view returns (uint256) { return allowed[_owner][_spender]; } } /** * @title Partial Basic * @dev Partial Basic is an experimental cryptocurrency that guarantees * unconditional, indeterminate rewards to network participants. */ contract PartialBasic is StandardToken { using SafeMath for uint256; string public constant name = "Partial Basic"; // solium-disable-line uppercase string public constant symbol = "PB"; // solium-disable-line uppercase uint8 public constant decimals = 18; // solium-disable-line uppercase uint256 public constant BASE_REWARD = 20000 ether; uint256 private constant PRECISION = 10**18; uint256 public totalNodes; uint256 public rewardStartTime; uint256 public rewardCheckpoint; uint256 private rewardTimestamp; mapping(address => uint256) public nodes; mapping(address => uint256) private claimed; event Mint(address indexed to, uint256 amount); event AddNode(address indexed owner); /** * @dev add a node for a specified address. * @param _owner The address to add a node for. */ function addNode(address _owner) external { uint256 checkpointCandidate; if (rewardStartTime == 0) { // initialise rewards rewardStartTime = block.timestamp; } else { // reward per node must increase to be a valid checkpoint // or a valid reward for this block must have already been checkpointed checkpointCandidate = rewardPerNode(); require(checkpointCandidate > rewardCheckpoint || block.timestamp == rewardTimestamp); } // claim outstanding rewards sync(_owner); if (rewardCheckpoint != checkpointCandidate) { // checkpoint the total reward per node rewardCheckpoint = checkpointCandidate; } if (rewardTimestamp != block.timestamp) { // reset the timestamp for the reward rewardTimestamp = block.timestamp; } // add node for address nodes[_owner] = nodes[_owner].add(1); // prevent new nodes from claiming old rewards claimed[_owner] = rewardCheckpoint.mul(nodes[_owner]); // update the total nodes in the network totalNodes = totalNodes.add(1); // fire event emit AddNode(_owner); } /** * @dev Gets the total reward for a node. * @return A uint256 representing the total reward of a node. */ function rewardPerNode() public view returns (uint256) { // no reward if there are no active nodes if (totalNodes == 0) { return; } // days since last checkpoint uint256 totalDays = block.timestamp.sub(rewardTimestamp).mul(PRECISION).div(1 days); // reward * days / nodes uint256 newReward = BASE_REWARD.mul(totalDays).div(PRECISION).div(totalNodes); // checkpoint + newReward return rewardCheckpoint.add(newReward); } /** * @dev Gets the outstanding reward of a specified address. * @param _owner The address to query the reward of. * @return A uint256 representing the outstanding reward of the passed address. */ function calculateReward(address _owner) public view returns (uint256) { // address must be running a node if (isMining(_owner)) { // return outstanding reward uint256 reward = rewardPerNode().mul(nodes[_owner]); return reward.sub(claimed[_owner]); } } /** * @dev sync an outstanding reward for a specified address. * @param _owner The address to sync rewards for. */ function sync(address _owner) public { uint256 reward = calculateReward(_owner); if (reward > 0) { claimed[_owner] = claimed[_owner].add(reward); balances[_owner] = balances[_owner].add(reward); emit Mint(_owner, reward); emit Transfer(address(0), _owner, reward); } } /** * @dev transfer token for a specified address. * @param _to The address to transfer to. * @param _value The amount to be transferred. */ function transfer(address _to, uint256 _value) public returns (bool) { sync(msg.sender); require(_to != address(0)); require(_value <= balances[msg.sender]); balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(_value); emit Transfer(msg.sender, _to, _value); return true; } /** * @dev Transfer tokens from one address to another. * @param _from address The address which you want to send tokens from. * @param _to address The address which you want to transfer to. * @param _value uint256 the amount of tokens to be transferred. */ function transferFrom(address _from, address _to, uint256 _value) public returns (bool) { sync(_from); require(_to != address(0)); require(_value <= balances[_from]); require(_value <= allowed[_from][msg.sender]); balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(_value); allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value); emit Transfer(_from, _to, _value); return true; } /** * @dev Gets the balance of the specified address. * @param _owner The address to query the the balance of. * @return A uint256 representing the amount owned by the passed address. */ function balanceOf(address _owner) public view returns (uint256) { return balances[_owner].add(calculateReward(_owner)); } /** * @dev returns the approximate total number of tokens in existence * @return A uint256 representing the approximate total number of tokens in existence. */ function totalSupply() public view returns (uint256) { if (rewardStartTime == 0) { return; } // days since start of rewards uint256 totalDays = block.timestamp.sub(rewardStartTime).mul(PRECISION).div(1 days); // reward * days return BASE_REWARD.mul(totalDays).div(PRECISION); } /** * @dev returns the mining status of the passed address. * @return A uint256 representing the mining status of the passed address. */ function isMining(address _owner) public view returns (bool) { return nodes[_owner] != 0; } /** * @dev A batch query to get all node information for a specified address. * @param _owner The address to query the details of. * @return A bool representing the mining status of the passed address. * @return A uint256 representing the number of nodes owned by the passed address. * @return A uint256 representing the amount owned by the passed address. * @return A uint256 representing the outstanding reward of the passed address. * @return A uint256 representing the total reward per node. * @return A uint256 representing the total nodes in the network. * @return A uint256 representing the total number of tokens in existence. */ function getInfo(address _owner) public view returns (bool, uint256, uint256, uint256, uint256, uint256, uint256) { return (isMining(_owner), nodes[_owner], balanceOf(_owner), calculateReward(_owner), rewardPerNode(), totalNodes, totalSupply()); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Swarm Source
bzzr://31580c1587935da3c4af3625bc24fa8ff014414d5071cdc20f485e95f7869377
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