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BAToken
- Verified, Token
- Basic Attention Token
- Fungible Token
- ERC-20
Verified
The following smart contract is for the Basic Attention Token (BAT) which is an ERC20 token. It allows users to create tokens by sending Ether to the contract during a specified funding period. The token exchange rate is fixed at 6400 BAT per Ether. The contract has a token creation cap of 1.5 billion BAT and a minimum creation amount of 675 million BAT. The contract can be finalized by the owner after the funding period ends, and any remaining Ether is sent to the owner. If the minimum creation amount is not met, users can request a refund of their Ether.
0x0d8775f648430679a709e98d2b0cb6250d2887ef
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pragma solidity ^0.4.10;
/* taking ideas from FirstBlood token */
contract SafeMath {
/* function assert(bool assertion) internal { */
/* if (!assertion) { */
/* throw; */
/* } */
/* } // assert no longer needed once solidity is on 0.4.10 */
function safeAdd(uint256 x, uint256 y) internal returns(uint256) {
uint256 z = x + y;
assert((z >= x) && (z >= y));
return z;
}
function safeSubtract(uint256 x, uint256 y) internal returns(uint256) {
assert(x >= y);
uint256 z = x - y;
return z;
}
function safeMult(uint256 x, uint256 y) internal returns(uint256) {
uint256 z = x * y;
assert((x == 0)||(z/x == y));
return z;
}
}
contract Token {
uint256 public totalSupply;
function balanceOf(address _owner) constant returns (uint256 balance);
function transfer(address _to, uint256 _value) returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
function approve(address _spender, uint256 _value) returns (bool success);
function allowance(address _owner, address _spender) constant returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
/* ERC 20 token */
contract StandardToken is Token {
function transfer(address _to, uint256 _value) returns (bool success) {
if (balances[msg.sender] >= _value && _value > 0) {
balances[msg.sender] -= _value;
balances[_to] += _value;
Transfer(msg.sender, _to, _value);
return true;
} else {
return false;
}
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
Transfer(_from, _to, _value);
return true;
} else {
return false;
}
}
function balanceOf(address _owner) constant returns (uint256 balance) {
return balances[_owner];
}
function approve(address _spender, uint256 _value) returns (bool success) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
}
contract BAToken is StandardToken, SafeMath {
// metadata
string public constant name = "Basic Attention Token";
string public constant symbol = "BAT";
uint256 public constant decimals = 18;
string public version = "1.0";
// contracts
address public ethFundDeposit; // deposit address for ETH for Brave International
address public batFundDeposit; // deposit address for Brave International use and BAT User Fund
// crowdsale parameters
bool public isFinalized; // switched to true in operational state
uint256 public fundingStartBlock;
uint256 public fundingEndBlock;
uint256 public constant batFund = 500 * (10**6) * 10**decimals; // 500m BAT reserved for Brave Intl use
uint256 public constant tokenExchangeRate = 6400; // 6400 BAT tokens per 1 ETH
uint256 public constant tokenCreationCap = 1500 * (10**6) * 10**decimals;
uint256 public constant tokenCreationMin = 675 * (10**6) * 10**decimals;
// events
event LogRefund(address indexed _to, uint256 _value);
event CreateBAT(address indexed _to, uint256 _value);
// constructor
function BAToken(
address _ethFundDeposit,
address _batFundDeposit,
uint256 _fundingStartBlock,
uint256 _fundingEndBlock)
{
isFinalized = false; //controls pre through crowdsale state
ethFundDeposit = _ethFundDeposit;
batFundDeposit = _batFundDeposit;
fundingStartBlock = _fundingStartBlock;
fundingEndBlock = _fundingEndBlock;
totalSupply = batFund;
balances[batFundDeposit] = batFund; // Deposit Brave Intl share
CreateBAT(batFundDeposit, batFund); // logs Brave Intl fund
}
/// @dev Accepts ether and creates new BAT tokens.
function createTokens() payable external {
if (isFinalized) throw;
if (block.number < fundingStartBlock) throw;
if (block.number > fundingEndBlock) throw;
if (msg.value == 0) throw;
uint256 tokens = safeMult(msg.value, tokenExchangeRate); // check that we're not over totals
uint256 checkedSupply = safeAdd(totalSupply, tokens);
// return money if something goes wrong
if (tokenCreationCap < checkedSupply) throw; // odd fractions won't be found
totalSupply = checkedSupply;
balances[msg.sender] += tokens; // safeAdd not needed; bad semantics to use here
CreateBAT(msg.sender, tokens); // logs token creation
}
/// @dev Ends the funding period and sends the ETH home
function finalize() external {
if (isFinalized) throw;
if (msg.sender != ethFundDeposit) throw; // locks finalize to the ultimate ETH owner
if(totalSupply < tokenCreationMin) throw; // have to sell minimum to move to operational
if(block.number <= fundingEndBlock && totalSupply != tokenCreationCap) throw;
// move to operational
isFinalized = true;
if(!ethFundDeposit.send(this.balance)) throw; // send the eth to Brave International
}
/// @dev Allows contributors to recover their ether in the case of a failed funding campaign.
function refund() external {
if(isFinalized) throw; // prevents refund if operational
if (block.number <= fundingEndBlock) throw; // prevents refund until sale period is over
if(totalSupply >= tokenCreationMin) throw; // no refunds if we sold enough
if(msg.sender == batFundDeposit) throw; // Brave Intl not entitled to a refund
uint256 batVal = balances[msg.sender];
if (batVal == 0) throw;
balances[msg.sender] = 0;
totalSupply = safeSubtract(totalSupply, batVal); // extra safe
uint256 ethVal = batVal / tokenExchangeRate; // should be safe; previous throws covers edges
LogRefund(msg.sender, ethVal); // log it
if (!msg.sender.send(ethVal)) throw; // if you're using a contract; make sure it works with .send gas limits
}
}BAToken ABI
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