Contract Source Code:
File 1 of 1 : CRVToken
pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
*/
library SafeMath {
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;
}
}
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
contract ERC20Basic {
uint256 public totalSupply;
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 Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) internal balances;
/**
* @dev Fix for the ERC20 short address attack.
*/
modifier onlyPayloadSize(uint size) {
assert(msg.data.length >= size + 4);
_;
}
/**
* @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 onlyPayloadSize(2 * 32) returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
}
/**
* @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 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;
/**
* 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
*/
function increaseApproval(address _spender, uint _addedValue) external onlyPayloadSize(2 * 32) returns (bool) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
function decreaseApproval(address _spender, uint _subtractedValue) external onlyPayloadSize(2 * 32) 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 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 onlyPayloadSize(3 * 32) returns (bool) {
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 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 onlyPayloadSize(2 * 32) returns (bool) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
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];
}
}
contract Owners {
mapping (address => bool) public owners;
uint public ownersCount;
uint public minOwnersRequired = 2;
event OwnerAdded(address indexed owner);
event OwnerRemoved(address indexed owner);
/**
* @dev initializes contract
* @param withDeployer bool indicates whether deployer is part of owners
*/
constructor(bool withDeployer) public {
if (withDeployer) {
ownersCount++;
owners[msg.sender] = true;
}
owners[0x23B599A0949C6147E05C267909C16506C7eFF229] = true;
owners[0x286A70B3E938FCa244208a78B1823938E8e5C174] = true;
ownersCount = ownersCount + 2;
}
/**
* @dev adds owner, can only by done by owners only
* @param _address address the address to be added
*/
function addOwner(address _address) public ownerOnly {
require(_address != address(0));
owners[_address] = true;
ownersCount++;
emit OwnerAdded(_address);
}
/**
* @dev removes owner, can only by done by owners only
* @param _address address the address to be removed
*/
function removeOwner(address _address) public ownerOnly notOwnerItself(_address) minOwners {
require(owners[_address] == true);
owners[_address] = false;
ownersCount--;
emit OwnerRemoved(_address);
}
/**
* @dev checks if sender is owner
*/
modifier ownerOnly {
require(owners[msg.sender]);
_;
}
modifier notOwnerItself(address _owner) {
require(msg.sender != _owner);
_;
}
modifier minOwners {
require(ownersCount > minOwnersRequired);
_;
}
}
/**
* @title Mintable token
* @dev Simple ERC20 Token example, with mintable token creation
* @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
* Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
*/
contract MintableToken is StandardToken, Owners(true) {
event Mint(address indexed to, uint256 amount);
event MintFinished();
event MintStarted();
bool public mintingFinished = false;
modifier canMint() {
require(!mintingFinished);
_;
}
/**
* @dev Function to mint tokens
* @param _to The address that will receive the minted tokens.
* @param _amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(address _to, uint256 _amount) external ownerOnly canMint onlyPayloadSize(2 * 32) returns (bool) {
return internalMint(_to, _amount);
}
/**
* @dev Function to stop minting new tokens.
* @return True if the operation was successful.
*/
function finishMinting() public ownerOnly canMint returns (bool) {
mintingFinished = true;
emit MintFinished();
return true;
}
/**
* @dev Function to start minting new tokens.
* @return True if the operation was successful.
*/
function startMinting() public ownerOnly returns (bool) {
mintingFinished = false;
emit MintStarted();
return true;
}
function internalMint(address _to, uint256 _amount) internal returns (bool) {
totalSupply = totalSupply.add(_amount);
balances[_to] = balances[_to].add(_amount);
emit Mint(_to, _amount);
emit Transfer(address(0), _to, _amount);
return true;
}
}
contract REIDAOMintableToken is MintableToken {
uint public decimals = 8;
bool public tradingStarted = false;
/**
* @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, uint _value) public canTrade returns (bool) {
return super.transfer(_to, _value);
}
/**
* @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, uint _value) public canTrade returns (bool) {
return super.transferFrom(_from, _to, _value);
}
/**
* @dev modifier that throws if trading has not started yet
*/
modifier canTrade() {
require(tradingStarted);
_;
}
/**
* @dev Allows the owner to enable the trading. Done only once.
*/
function startTrading() public ownerOnly {
tradingStarted = true;
}
}
contract REIDAOMintableLockableToken is REIDAOMintableToken {
struct TokenLock {
uint256 value;
uint lockedUntil;
}
mapping (address => TokenLock[]) public locks;
/**
* @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, uint _value) public canTransfer(msg.sender, _value) returns (bool) {
return super.transfer(_to, _value);
}
/**
* @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,
uint _value) public canTransfer(msg.sender, _value) returns (bool) {
return super.transferFrom(_from, _to, _value);
}
/**
* @dev Allows authorized callers to lock `_value` tokens belong to `_to` until timestamp `_lockUntil`.
* This function can be called independently of transferAndLockTokens(), hence the double checking of timestamp.
* @param _to address The address to be locked.
* @param _value uint The amout of tokens to be locked.
* @param _lockUntil uint The UNIX timestamp tokens are locked until.
*/
function lockTokens(address _to, uint256 _value, uint256 _lockUntil) public ownerOnly {
require(_value <= balanceOf(_to));
require(_lockUntil > now);
locks[_to].push(TokenLock(_value, _lockUntil));
}
/**
* @dev Allows authorized callers to mint `_value` tokens for `_to`, and lock them until timestamp `_lockUntil`.
* @param _to address The address to which tokens to be minted and locked.
* @param _value uint The amout of tokens to be minted and locked.
* @param _lockUntil uint The UNIX timestamp tokens are locked until.
*/
function mintAndLockTokens(address _to, uint256 _value, uint256 _lockUntil) public ownerOnly {
require(_lockUntil > now);
internalMint(_to, _value);
lockTokens(_to, _value, _lockUntil);
}
/**
* @dev Checks the amount of transferable tokens belongs to `_holder`.
* @param _holder address The address to be checked.
*/
function transferableTokens(address _holder) public constant returns (uint256) {
uint256 lockedTokens = getLockedTokens(_holder);
return balanceOf(_holder).sub(lockedTokens);
}
/**
* @dev Retrieves the amount of locked tokens `_holder` has.
* @param _holder address The address to be checked.
*/
function getLockedTokens(address _holder) public constant returns (uint256) {
uint256 numLocks = getTokenLocksCount(_holder);
// Iterate through all the locks the holder has
uint256 lockedTokens = 0;
for (uint256 i = 0; i < numLocks; i++) {
if (locks[_holder][i].lockedUntil >= now) {
lockedTokens = lockedTokens.add(locks[_holder][i].value);
}
}
return lockedTokens;
}
/**
* @dev Retrieves the number of token locks `_holder` has.
* @param _holder address The address the token locks belongs to.
* @return A uint256 representing the total number of locks.
*/
function getTokenLocksCount(address _holder) internal constant returns (uint256 index) {
return locks[_holder].length;
}
/**
* @dev Modifier that throws if `_value` amount of tokens can't be transferred.
* @param _sender address the address of the sender
* @param _value uint the amount of tokens intended to be transferred
*/
modifier canTransfer(address _sender, uint256 _value) {
uint256 transferableTokensAmt = transferableTokens(_sender);
require(_value <= transferableTokensAmt);
// delete locks if all locks are cleared
if (transferableTokensAmt == balanceOf(_sender) && getTokenLocksCount(_sender) > 0) {
delete locks[_sender];
}
_;
}
}
/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract BurnableToken is BasicToken {
event Burn(address indexed burner, uint256 value);
/**
* @dev Burns a specific amount of tokens.
* @param _value The amount of token to be burned.
*/
function burn(uint256 _value) public {
require(_value <= balances[msg.sender]);
// no need to require value <= totalSupply, since that would imply the
// sender's balance is greater than the totalSupply, which *should* be an assertion failure
address burner = msg.sender;
balances[burner] = balances[burner].sub(_value);
totalSupply = totalSupply.sub(_value);
emit Burn(burner, _value);
emit Transfer(burner, address(0), _value);
}
}
contract REIDAOBurnableToken is BurnableToken {
mapping (address => bool) public hostedWallets;
/**
* @dev burns tokens, can only be done by hosted wallets
* @param _value uint256 the amount of tokens to be burned
*/
function burn(uint256 _value) public hostedWalletsOnly {
return super.burn(_value);
}
/**
* @dev adds hosted wallet
* @param _wallet address the address to be added
*/
function addHostedWallet(address _wallet) public {
hostedWallets[_wallet] = true;
}
/**
* @dev removes hosted wallet
* @param _wallet address the address to be removed
*/
function removeHostedWallet(address _wallet) public {
hostedWallets[_wallet] = false;
}
/**
* @dev checks if sender is hosted wallets
*/
modifier hostedWalletsOnly {
require(hostedWallets[msg.sender] == true);
_;
}
}
contract REIDAOMintableBurnableLockableToken is REIDAOMintableLockableToken, REIDAOBurnableToken {
/**
* @dev adds hosted wallet, can only be done by owners.
* @param _wallet address the address to be added
*/
function addHostedWallet(address _wallet) public ownerOnly {
return super.addHostedWallet(_wallet);
}
/**
* @dev removes hosted wallet, can only be done by owners.
* @param _wallet address the address to be removed
*/
function removeHostedWallet(address _wallet) public ownerOnly {
return super.removeHostedWallet(_wallet);
}
/**
* @dev burns tokens, can only be done by hosted wallets
* @param _value uint256 the amount of tokens to be burned
*/
function burn(uint256 _value) public canTransfer(msg.sender, _value) {
return super.burn(_value);
}
}
contract CRVToken is REIDAOMintableBurnableLockableToken {
string public name = "Crowdvilla Ownership";
string public symbol = "CRV";
}