Firstblood is a “Decentralized eSports Platform Based on Smart Contracts”. This is just a quick look into the smart contract behind the crowdfunding.
Update 00:08 Sep 26 2016 AEST – The crowdsale hit the maximum cap limit of raising 465,313 ETH within the first 8 minutes of commencement of the crowdsale.
Update 22:10 Oct 09 2016 UTC – The crowd sale was over in 9 minutes (a few < 1 ETH transactions shortly after) - See Error sending transaction to the First Blood crowd sale contract. Trading of First Blood 1ST tokens will be enabled around Dec 23 2016 – see When can First Blood 1ST tokens be transferred?.
Resources
- firstblood.io
- https://firstblood.io/sale/#
- Firstblood’s github repository with the main FirstBloodToken.sol smart contract
- Verified contract on etherscan.io – 0xaf30d2a7e90d7dc361c8c4585e9bb7d2f6f15bc7
- Decentralized eSports Platform FirstBlood Raises $5.5M in Minutes
Verified Smart Contract From Etherscan.io
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/** * Overflow aware uint math functions. * * Inspired by https://github.com/MakerDAO/maker-otc/blob/master/contracts/simple_market.sol */ contract SafeMath { //internals function safeMul(uint a, uint b) internal returns (uint) { uint c = a * b; assert(a == 0 || c / a == b); return c; } function safeSub(uint a, uint b) internal returns (uint) { assert(b <= a); return a - b; } function safeAdd(uint a, uint b) internal returns (uint) { uint c = a + b; assert(c>=a && c>=b); return c; } function assert(bool assertion) internal { if (!assertion) throw; } } /** * ERC 20 token * * https://github.com/ethereum/EIPs/issues/20 */ contract Token { /// @return total amount of tokens function totalSupply() constant returns (uint256 supply) {} /// @param _owner The address from which the balance will be retrieved /// @return The balance function balanceOf(address _owner) constant returns (uint256 balance) {} /// @notice send `_value` token to `_to` from `msg.sender` /// @param _to The address of the recipient /// @param _value The amount of token to be transferred /// @return Whether the transfer was successful or not function transfer(address _to, uint256 _value) returns (bool success) {} /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from` /// @param _from The address of the sender /// @param _to The address of the recipient /// @param _value The amount of token to be transferred /// @return Whether the transfer was successful or not function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {} /// @notice `msg.sender` approves `_addr` to spend `_value` tokens /// @param _spender The address of the account able to transfer the tokens /// @param _value The amount of wei to be approved for transfer /// @return Whether the approval was successful or not function approve(address _spender, uint256 _value) returns (bool success) {} /// @param _owner The address of the account owning tokens /// @param _spender The address of the account able to transfer the tokens /// @return Amount of remaining tokens allowed to spent 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 * * https://github.com/ethereum/EIPs/issues/20 */ contract StandardToken is Token { /** * Reviewed: * - Interger overflow = OK, checked */ function transfer(address _to, uint256 _value) returns (bool success) { //Default assumes totalSupply can't be over max (2^256 - 1). //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap. //Replace the if with this one instead. if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) { //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) { //same as above. Replace this line with the following if you want to protect against wrapping uints. if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) { //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; uint256 public totalSupply; } /** * First blood crowdsale crowdsale contract. * * Security criteria evaluated against http://ethereum.stackexchange.com/questions/8551/methodological-security-review-of-a-smart-contract * * */ contract FirstBloodToken is StandardToken, SafeMath { string public name = "FirstBlood Token"; string public symbol = "1ST"; uint public decimals = 18; uint public startBlock; //crowdsale start block (set in constructor) uint public endBlock; //crowdsale end block (set in constructor) // Initial founder address (set in constructor) // All deposited ETH will be instantly forwarded to this address. // Address is a multisig wallet. address public founder = 0x0; // signer address (for clickwrap agreement) // see function() {} for comments address public signer = 0x0; uint public etherCap = 465313 * 10**18; //max amount raised during crowdsale (5.5M USD worth of ether will be measured with a moving average market price at beginning of the crowdsale) uint public transferLockup = 370285; //transfers are locked for this many blocks after endBlock (assuming 14 second blocks, this is 2 months) uint public founderLockup = 2252571; //founder allocation cannot be created until this many blocks after endBlock (assuming 14 second blocks, this is 1 year) uint public bountyAllocation = 2500000 * 10**18; //2.5M tokens allocated post-crowdsale for the bounty fund uint public ecosystemAllocation = 5 * 10**16; //5% of token supply allocated post-crowdsale for the ecosystem fund uint public founderAllocation = 10 * 10**16; //10% of token supply allocated post-crowdsale for the founder allocation bool public bountyAllocated = false; //this will change to true when the bounty fund is allocated bool public ecosystemAllocated = false; //this will change to true when the ecosystem fund is allocated bool public founderAllocated = false; //this will change to true when the founder fund is allocated uint public presaleTokenSupply = 0; //this will keep track of the token supply created during the crowdsale uint public presaleEtherRaised = 0; //this will keep track of the Ether raised during the crowdsale bool public halted = false; //the founder address can set this to true to halt the crowdsale due to emergency event Buy(address indexed sender, uint eth, uint fbt); event Withdraw(address indexed sender, address to, uint eth); event AllocateFounderTokens(address indexed sender); event AllocateBountyAndEcosystemTokens(address indexed sender); function FirstBloodToken(address founderInput, address signerInput, uint startBlockInput, uint endBlockInput) { founder = founderInput; signer = signerInput; startBlock = startBlockInput; endBlock = endBlockInput; } /** * Security review * * - Integer overflow: does not apply, blocknumber can't grow that high * - Division is the last operation and constant, should not cause issues * - Price function plotted https://github.com/Firstbloodio/token/issues/2 */ function price() constant returns(uint) { if (block.number>=startBlock && block.number<startBlock+250) return 170; //power hour if (block.number<startBlock || block.number>endBlock) return 100; //default price return 100 + 4*(endBlock - block.number)/(endBlock - startBlock + 1)*67/4; //crowdsale price } // price() exposed for unit tests function testPrice(uint blockNumber) constant returns(uint) { if (blockNumber>=startBlock && blockNumber<startBlock+250) return 170; //power hour if (blockNumber<startBlock || blockNumber>endBlock) return 100; //default price return 100 + 4*(endBlock - blockNumber)/(endBlock - startBlock + 1)*67/4; //crowdsale price } // Buy entry point function buy(uint8 v, bytes32 r, bytes32 s) { buyRecipient(msg.sender, v, r, s); } /** * Main token buy function. * * Security review * * - Integer math: ok - using SafeMath * * - halt flag added - ok * * Applicable tests: * * - Test halting, buying, and failing * - Test buying on behalf of a recipient * - Test buy * - Test unhalting, buying, and succeeding * - Test buying after the sale ends * */ function buyRecipient(address recipient, uint8 v, bytes32 r, bytes32 s) { bytes32 hash = sha256(msg.sender); if (ecrecover(hash,v,r,s) != signer) throw; if (block.number<startBlock || block.number>endBlock || safeAdd(presaleEtherRaised,msg.value)>etherCap || halted) throw; uint tokens = safeMul(msg.value, price()); balances[recipient] = safeAdd(balances[recipient], tokens); totalSupply = safeAdd(totalSupply, tokens); presaleEtherRaised = safeAdd(presaleEtherRaised, msg.value); if (!founder.call.value(msg.value)()) throw; //immediately send Ether to founder address Buy(recipient, msg.value, tokens); } /** * Set up founder address token balance. * * allocateBountyAndEcosystemTokens() must be calld first. * * Security review * * - Integer math: ok - only called once with fixed parameters * * Applicable tests: * * - Test bounty and ecosystem allocation * - Test bounty and ecosystem allocation twice * */ function allocateFounderTokens() { if (msg.sender!=founder) throw; if (block.number <= endBlock + founderLockup) throw; if (founderAllocated) throw; if (!bountyAllocated || !ecosystemAllocated) throw; balances[founder] = safeAdd(balances[founder], presaleTokenSupply * founderAllocation / (1 ether)); totalSupply = safeAdd(totalSupply, presaleTokenSupply * founderAllocation / (1 ether)); founderAllocated = true; AllocateFounderTokens(msg.sender); } /** * Set up founder address token balance. * * Set up bounty pool. * * Security review * * - Integer math: ok - only called once with fixed parameters * * Applicable tests: * * - Test founder token allocation too early * - Test founder token allocation on time * - Test founder token allocation twice * */ function allocateBountyAndEcosystemTokens() { if (msg.sender!=founder) throw; if (block.number <= endBlock) throw; if (bountyAllocated || ecosystemAllocated) throw; presaleTokenSupply = totalSupply; balances[founder] = safeAdd(balances[founder], presaleTokenSupply * ecosystemAllocation / (1 ether)); totalSupply = safeAdd(totalSupply, presaleTokenSupply * ecosystemAllocation / (1 ether)); balances[founder] = safeAdd(balances[founder], bountyAllocation); totalSupply = safeAdd(totalSupply, bountyAllocation); bountyAllocated = true; ecosystemAllocated = true; AllocateBountyAndEcosystemTokens(msg.sender); } /** * Emergency Stop crowdsale. * * Applicable tests: * * - Test unhalting, buying, and succeeding */ function halt() { if (msg.sender!=founder) throw; halted = true; } function unhalt() { if (msg.sender!=founder) throw; halted = false; } /** * Change founder address (where crowdsale ETH is being forwarded). * * Applicable tests: * * - Test founder change by hacker * - Test founder change * - Test founder token allocation twice * */ function changeFounder(address newFounder) { if (msg.sender!=founder) throw; founder = newFounder; } /** * ERC 20 Standard Token interface transfer function * * Prevent transfers until freeze period is over. * * Applicable tests: * * - Test restricted early transfer * - Test transfer after restricted period */ function transfer(address _to, uint256 _value) returns (bool success) { if (block.number <= endBlock + transferLockup && msg.sender!=founder) throw; return super.transfer(_to, _value); } /** * ERC 20 Standard Token interface transfer function * * Prevent transfers until freeze period is over. */ function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { if (block.number <= endBlock + transferLockup && msg.sender!=founder) throw; return super.transferFrom(_from, _to, _value); } /** * Do not allow direct deposits. * * All crowdsale depositors must have read the legal agreement. * This is confirmed by having them signing the terms of service on the website. * They give their crowdsale Ethereum source address on the website. * Website signs this address using crowdsale private key (different from founders key). * buy() takes this signature as input and rejects all deposits that do not have * signature you receive after reading terms of service. * */ function() { throw; } } |