Here is Decentralized Capital’s website, their FAQ, and their Token Contracts page.
Unfortunately you need to be verified to use this decentralised exchange. Here is their IDEX decentralised exchange screen:
Here is their USD.DC verified smart contract deployed at 0x01a7018e6d1fde8a68d12f59b6532fb523b6259d:
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contract Assertive { function assert(bool assertion) { if (!assertion) throw; } } contract TokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); } contract Owned is Assertive { address internal owner; event SetOwner(address indexed previousOwner, address indexed newOwner); function Owned () { owner = msg.sender; } modifier onlyOwner { assert(msg.sender == owner); _ } function setOwner(address newOwner) onlyOwner { SetOwner(owner, newOwner); owner = newOwner; } function getOwner() returns (address out) { return owner; } } contract StateTransferrable is Owned { bool internal locked; event Locked(address indexed from); event PropertySet(address indexed from); modifier onlyIfUnlocked { assert(!locked); _ } modifier setter { _ PropertySet(msg.sender); } modifier onlyOwnerUnlocked { assert(!locked && msg.sender == owner); _ } function lock() onlyOwner onlyIfUnlocked { locked = true; Locked(msg.sender); } function isLocked() returns (bool status) { return locked; } } contract TrustEvents { event AuthInit(address indexed from); event AuthComplete(address indexed from, address indexed with); event AuthPending(address indexed from); event Unauthorized(address indexed from); event InitCancel(address indexed from); event NothingToCancel(address indexed from); event SetMasterKey(address indexed from); event AuthCancel(address indexed from, address indexed with); event NameRegistered(address indexed from, bytes32 indexed name); } contract Trust is StateTransferrable, TrustEvents { mapping (address => bool) public masterKeys; mapping (address => bytes32) public nameRegistry; address[] public masterKeyIndex; mapping (address => bool) public masterKeyActive; mapping (address => bool) public trustedClients; mapping (uint256 => address) public functionCalls; mapping (address => uint256) public functionCalling; function activateMasterKey(address addr) internal { if (!masterKeyActive[addr]) { masterKeyActive[addr] = true; masterKeyIndex.push(addr); } } function setTrustedClient(address addr) onlyOwnerUnlocked setter { trustedClients[addr] = true; } function untrustClient(address addr) multisig(sha3(msg.data)) { trustedClients[addr] = false; } function trustClient(address addr) multisig(sha3(msg.data)) { trustedClients[addr] = true; } function setMasterKey(address addr) onlyOwnerUnlocked { assert(!masterKeys[addr]); activateMasterKey(addr); masterKeys[addr] = true; SetMasterKey(msg.sender); } modifier onlyMasterKey { assert(masterKeys[msg.sender]); _ } function extractMasterKeyIndexLength() returns (uint256 length) { return masterKeyIndex.length; } function resetAction(uint256 hash) internal { address addr = functionCalls[hash]; functionCalls[hash] = 0x0; functionCalling[addr] = 0; } function authCancel(address from) external returns (uint8 status) { if (!masterKeys[from] || !trustedClients[msg.sender]) { Unauthorized(from); return 0; } uint256 call = functionCalling[from]; if (call == 0) { NothingToCancel(from); return 1; } else { AuthCancel(from, from); functionCalling[from] = 0; functionCalls[call] = 0x0; return 2; } } function cancel() returns (uint8 code) { if (!masterKeys[msg.sender]) { Unauthorized(msg.sender); return 0; } uint256 call = functionCalling[msg.sender]; if (call == 0) { NothingToCancel(msg.sender); return 1; } else { AuthCancel(msg.sender, msg.sender); uint256 hash = functionCalling[msg.sender]; functionCalling[msg.sender] = 0x0; functionCalls[hash] = 0; return 2; } } function authCall(address from, bytes32 hash) external returns (uint8 code) { if (!masterKeys[from] && !trustedClients[msg.sender]) { Unauthorized(from); return 0; } if (functionCalling[from] == 0) { if (functionCalls[uint256(hash)] == 0x0) { functionCalls[uint256(hash)] = from; functionCalling[from] = uint256(hash); AuthInit(from); return 1; } else { AuthComplete(functionCalls[uint256(hash)], from); resetAction(uint256(hash)); return 2; } } else { AuthPending(from); return 3; } } modifier multisig (bytes32 hash) { if (!masterKeys[msg.sender]) { Unauthorized(msg.sender); } else if (functionCalling[msg.sender] == 0) { if (functionCalls[uint256(hash)] == 0x0) { functionCalls[uint256(hash)] = msg.sender; functionCalling[msg.sender] = uint256(hash); AuthInit(msg.sender); } else { AuthComplete(functionCalls[uint256(hash)], msg.sender); resetAction(uint256(hash)); _ } } else { AuthPending(msg.sender); } } function voteOutMasterKey(address addr) multisig(sha3(msg.data)) { assert(masterKeys[addr]); masterKeys[addr] = false; } function voteInMasterKey(address addr) multisig(sha3(msg.data)) { assert(!masterKeys[addr]); activateMasterKey(addr); masterKeys[addr] = true; } function identify(bytes32 name) onlyMasterKey { nameRegistry[msg.sender] = name; NameRegistered(msg.sender, name); } function nameFor(address addr) returns (bytes32 name) { return nameRegistry[addr]; } } contract TrustClient is StateTransferrable, TrustEvents { address public trustAddress; function setTrust(address addr) setter onlyOwnerUnlocked { trustAddress = addr; } function nameFor(address addr) constant returns (bytes32 name) { return Trust(trustAddress).nameFor(addr); } function cancel() returns (uint8 status) { assert(trustAddress != address(0x0)); uint8 code = Trust(trustAddress).authCancel(msg.sender); if (code == 0) Unauthorized(msg.sender); else if (code == 1) NothingToCancel(msg.sender); else if (code == 2) AuthCancel(msg.sender, msg.sender); return code; } modifier multisig (bytes32 hash) { assert(trustAddress != address(0x0)); address current = Trust(trustAddress).functionCalls(uint256(hash)); uint8 code = Trust(trustAddress).authCall(msg.sender, hash); if (code == 0) Unauthorized(msg.sender); else if (code == 1) AuthInit(msg.sender); else if (code == 2) { AuthComplete(current, msg.sender); _ } else if (code == 3) { AuthPending(msg.sender); } } } contract Relay { function relayReceiveApproval(address _caller, address _spender, uint256 _amount, bytes _extraData) returns (bool success); } contract TokenBase is Owned { bytes32 public standard = 'Token 0.1'; bytes32 public name; bytes32 public symbol; uint256 public totalSupply; bool public allowTransactions; event Approval(address indexed from, address indexed spender, uint256 amount); mapping (address => uint256) public balanceOf; mapping (address => mapping (address => uint256)) public allowance; event Transfer(address indexed from, address indexed to, uint256 value); function transfer(address _to, uint256 _value) returns (bool success); function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success); function approve(address _spender, uint256 _value) returns (bool success); function transferFrom(address _from, address _to, uint256 _value) returns (bool success); function () { throw; } } contract Precision { uint8 public decimals; } contract Token is TokenBase, Precision {} contract Util { function pow10(uint256 a, uint8 b) internal returns (uint256 result) { for (uint8 i = 0; i < b; i++) { a *= 10; } return a; } function div10(uint256 a, uint8 b) internal returns (uint256 result) { for (uint8 i = 0; i < b; i++) { a /= 10; } return a; } function max(uint256 a, uint256 b) internal returns (uint256 res) { if (a >= b) return a; return b; } } /** * @title DVIP Contract. DCAsset Membership Token contract. * * @author Ray Pulver, ray@decentralizedcapital.com */ contract DVIP is Token, StateTransferrable, TrustClient, Util { uint256 public totalSupply; mapping (address => bool) public frozenAccount; mapping (address => address[]) public allowanceIndex; mapping (address => mapping (address => bool)) public allowanceActive; address[] public accountIndex; mapping (address => bool) public accountActive; address public oversightAddress; uint256 public expiry; uint256 public treasuryBalance; bool public isActive; mapping (address => uint256) public exportFee; address[] public exportFeeIndex; mapping (address => bool) exportFeeActive; mapping (address => uint256) public importFee; address[] public importFeeIndex; mapping (address => bool) importFeeActive; event FrozenFunds(address target, bool frozen); event PrecisionSet(address indexed from, uint8 precision); event TransactionsShutDown(address indexed from); event FeeSetup(address indexed from, address indexed target, uint256 amount); /** * Constructor. * */ function DVIP() { isActive = true; treasuryBalance = 0; totalSupply = 0; name = "DVIP"; symbol = "DVIP"; decimals = 6; allowTransactions = true; expiry = 1514764800; //1 jan 2018 } /* --------------- modifiers --------------*/ /** * Makes sure a method is only called by an overseer. */ modifier onlyOverseer { assert(msg.sender == oversightAddress); _ } /* --------------- setter methods, only for the unlocked state --------------*/ /** * Sets the oversight address (not the contract). * * @param addr The oversight contract address. */ function setOversight(address addr) onlyOwnerUnlocked setter { oversightAddress = addr; } /** * Sets the total supply * * @param total Total supply of the asset. */ function setTotalSupply(uint256 total) onlyOwnerUnlocked setter { totalSupply = total; } /** * Set the Token Standard the contract applies to. * * @param std the Standard. */ function setStandard(bytes32 std) onlyOwnerUnlocked setter { standard = std; } /** * Sets the name of the contraxt * * @param _name the name. */ function setName(bytes32 _name) onlyOwnerUnlocked setter { name = _name; } /** * Sets the symbol * * @param sym The Symbol */ function setSymbol(bytes32 sym) onlyOwnerUnlocked setter { symbol = sym; } /** * Sets the precision * * @param precision Amount of decimals */ function setPrecisionDirect(uint8 precision) onlyOwnerUnlocked { decimals = precision; PrecisionSet(msg.sender, precision); } /** * Sets the balance of a certain account. * * @param addr Address of the account * @param amount Amount of assets to set on the account */ function setAccountBalance(address addr, uint256 amount) onlyOwnerUnlocked { balanceOf[addr] = amount; activateAccount(addr); } /** * Sets an allowance from a specific account to a specific account. * * @param from From-part of the allowance * @param to To-part of the allowance * @param amount Amount of the allowance */ function setAccountAllowance(address from, address to, uint256 amount) onlyOwnerUnlocked { allowance[from][to] = amount; activateAllowanceRecord(from, to); } /** * Sets the treasure balance to a certain account. * * @param amount Amount of assets to pre-set in the treasury */ function setTreasuryBalance(uint256 amount) onlyOwnerUnlocked { treasuryBalance = amount; } /** * Sets a certain account on frozen/unfrozen * * @param addr Account that will be frozen/unfrozen * @param frozen Boolean to freeze or unfreeze */ function setAccountFrozenStatus(address addr, bool frozen) onlyOwnerUnlocked { activateAccount(addr); frozenAccount[addr] = frozen; } /** * Sets up a import fee for a certain address. * * @param addr Address that will require fee * @param fee Amount of fee */ function setupImportFee(address addr, uint256 fee) onlyOwnerUnlocked { importFee[addr] = fee; activateImportFeeChargeRecord(addr); FeeSetup(msg.sender, addr, fee); } /** * Sets up a export fee for a certain address. * * @param addr Address that will require fee * @param fee Amount of fee */ function setupExportFee(address addr, uint256 fee) onlyOwnerUnlocked { exportFee[addr] = fee; activateExportFeeChargeRecord(addr); FeeSetup(msg.sender, addr, fee); } /* --------------- main token methods --------------*/ /** * @notice Transfer `_amount` from `msg.sender.address()` to `_to`. * * @param _to Address that will receive. * @param _amount Amount to be transferred. */ function transfer(address _to, uint256 _amount) returns (bool success) { assert(allowTransactions); assert(!frozenAccount[msg.sender]); assert(balanceOf[msg.sender] >= _amount); assert(balanceOf[_to] + _amount >= balanceOf[_to]); activateAccount(msg.sender); activateAccount(_to); balanceOf[msg.sender] -= _amount; if (_to == address(this)) treasuryBalance += _amount; else balanceOf[_to] += _amount; Transfer(msg.sender, _to, _amount); return true; } /** * @notice Transfer `_amount` from `_from` to `_to`. * * @param _from Origin address * @param _to Address that will receive * @param _amount Amount to be transferred. * @return result of the method call */ function transferFrom(address _from, address _to, uint256 _amount) returns (bool success) { assert(allowTransactions); assert(!frozenAccount[msg.sender]); assert(!frozenAccount[_from]); assert(balanceOf[_from] >= _amount); assert(balanceOf[_to] + _amount >= balanceOf[_to]); assert(_amount <= allowance[_from][msg.sender]); balanceOf[_from] -= _amount; balanceOf[_to] += _amount; allowance[_from][msg.sender] -= _amount; activateAccount(_from); activateAccount(_to); activateAccount(msg.sender); Transfer(_from, _to, _amount); return true; } /** * @notice Approve spender `_spender` to transfer `_amount` from `msg.sender.address()` * * @param _spender Address that receives the cheque * @param _amount Amount on the cheque * @param _extraData Consequential contract to be executed by spender in same transcation. * @return result of the method call */ function approveAndCall(address _spender, uint256 _amount, bytes _extraData) returns (bool success) { assert(allowTransactions); assert(!frozenAccount[msg.sender]); allowance[msg.sender][_spender] = _amount; activateAccount(msg.sender); activateAccount(_spender); activateAllowanceRecord(msg.sender, _spender); TokenRecipient spender = TokenRecipient(_spender); spender.receiveApproval(msg.sender, _amount, this, _extraData); Approval(msg.sender, _spender, _amount); return true; } /** * @notice Approve spender `_spender` to transfer `_amount` from `msg.sender.address()` * * @param _spender Address that receives the cheque * @param _amount Amount on the cheque * @return result of the method call */ function approve(address _spender, uint256 _amount) returns (bool success) { assert(allowTransactions); assert(!frozenAccount[msg.sender]); allowance[msg.sender][_spender] = _amount; activateAccount(msg.sender); activateAccount(_spender); activateAllowanceRecord(msg.sender, _spender); Approval(msg.sender, _spender, _amount); return true; } /* --------------- multisig admin methods --------------*/ /** * @notice Sets the expiry time in milliseconds since 1970. * * @param ts milliseconds since 1970. * */ function setExpiry(uint256 ts) multisig(sha3(msg.data)) { expiry = ts; } /** * @notice Mints `mintedAmount` new tokens to the hotwallet `hotWalletAddress`. * * @param mintedAmount Amount of new tokens to be minted. */ function mint(uint256 mintedAmount) multisig(sha3(msg.data)) { treasuryBalance += mintedAmount; totalSupply += mintedAmount; } /** * @notice Destroys `destroyAmount` new tokens from the hotwallet `hotWalletAddress` * * @param destroyAmount Amount of new tokens to be minted. */ function destroyTokens(uint256 destroyAmount) multisig(sha3(msg.data)) { assert(treasuryBalance >= destroyAmount); treasuryBalance -= destroyAmount; totalSupply -= destroyAmount; } /** * @notice Transfers `amount` from the treasury to `to` * * @param to Address to transfer to * @param amount Amount to transfer from treasury */ function transferFromTreasury(address to, uint256 amount) multisig(sha3(msg.data)) { assert(treasuryBalance >= amount); treasuryBalance -= amount; balanceOf[to] += amount; activateAccount(to); } /* --------------- fee setting administration methods --------------*/ /** * @notice Sets an import fee of `fee` on address `addr` * * @param addr Address for which the fee is valid * @param addr fee Fee * */ function setImportFee(address addr, uint256 fee) multisig(sha3(msg.data)) { uint256 max = 1; max = pow10(1, decimals); assert(fee <= max); importFee[addr] = fee; activateImportFeeChargeRecord(addr); } /** * @notice Sets an export fee of `fee` on address `addr` * * @param addr Address for which the fee is valid * @param addr fee Fee * */ function setExportFee(address addr, uint256 fee) multisig(sha3(msg.data)) { uint256 max = 1; max = pow10(1, decimals); assert(fee <= max); exportFee[addr] = fee; activateExportFeeChargeRecord(addr); } /* --------------- multisig emergency methods --------------*/ /** * @notice Sets allow transactions to `allow` * * @param allow Allow or disallow transactions */ function voteAllowTransactions(bool allow) multisig(sha3(msg.data)) { assert(allow != allowTransactions); allowTransactions = allow; } /** * @notice Destructs the contract and sends remaining `this.balance` Ether to `beneficiary` * * @param beneficiary Beneficiary of remaining Ether on contract */ function voteSuicide(address beneficiary) multisig(sha3(msg.data)) { selfdestruct(beneficiary); } /** * @notice Sets frozen to `freeze` for account `target` * * @param addr Address to be frozen/unfrozen * @param freeze Freeze/unfreeze account */ function freezeAccount(address addr, bool freeze) multisig(sha3(msg.data)) { frozenAccount[addr] = freeze; activateAccount(addr); } /** * @notice Seizes `seizeAmount` of tokens from `address` and transfers it to hotwallet * * @param addr Adress to seize tokens from * @param amount Amount of tokens to seize */ function seizeTokens(address addr, uint256 amount) multisig(sha3(msg.data)) { assert(balanceOf[addr] >= amount); assert(frozenAccount[addr]); activateAccount(addr); balanceOf[addr] -= amount; treasuryBalance += amount; } /* --------------- fee calculation method ---------------- */ /** * @notice 'Returns the fee for a transfer from `from` to `to` on an amount `amount`. * * Fee's consist of a possible * - import fee on transfers to an address * - export fee on transfers from an address * DVIP ownership on an address * - reduces fee on a transfer from this address to an import fee-ed address * - reduces the fee on a transfer to this address from an export fee-ed address * DVIP discount does not work for addresses that have an import fee or export fee set up against them. * * DVIP discount goes up to 100% * * @param from From address * @param to To address * @param amount Amount for which fee needs to be calculated. * */ function feeFor(address from, address to, uint256 amount) constant external returns (uint256 value) { uint256 fee = exportFee[from] + importFee[to]; if (fee == 0) return 0; uint256 amountHeld; bool discounted = true; uint256 oneDVIPUnit; if (exportFee[from] == 0 && balanceOf[from] != 0 && now < expiry) { amountHeld = balanceOf[from]; } else if (importFee[to] == 0 && balanceOf[to] != 0 && now < expiry) { amountHeld = balanceOf[to]; } else discounted = false; if (discounted) { oneDVIPUnit = pow10(1, decimals); if (amountHeld > oneDVIPUnit) amountHeld = oneDVIPUnit; uint256 remaining = oneDVIPUnit - amountHeld; return div10(amount*fee*remaining, decimals*2); } return div10(amount*fee, decimals); } /* --------------- overseer methods for emergency --------------*/ /** * @notice Shuts down all transaction and approval options on the asset contract */ function shutdownTransactions() onlyOverseer { allowTransactions = false; TransactionsShutDown(msg.sender); } /* --------------- helper methods for siphoning --------------*/ function extractAccountAllowanceRecordLength(address addr) constant returns (uint256 len) { return allowanceIndex[addr].length; } function extractAccountLength() constant returns (uint256 length) { return accountIndex.length; } /* --------------- private methods --------------*/ function activateAccount(address addr) internal { if (!accountActive[addr]) { accountActive[addr] = true; accountIndex.push(addr); } } function activateAllowanceRecord(address from, address to) internal { if (!allowanceActive[from][to]) { allowanceActive[from][to] = true; allowanceIndex[from].push(to); } } function activateExportFeeChargeRecord(address addr) internal { if (!exportFeeActive[addr]) { exportFeeActive[addr] = true; exportFeeIndex.push(addr); } } function activateImportFeeChargeRecord(address addr) internal { if (!importFeeActive[addr]) { importFeeActive[addr] = true; importFeeIndex.push(addr); } } function extractImportFeeChargeLength() returns (uint256 length) { return importFeeIndex.length; } function extractExportFeeChargeLength() returns (uint256 length) { return exportFeeIndex.length; } } /** * @title DCAssetBackend Contract * * @author Ray Pulver, ray@decentralizedcapital.com */ contract DCAssetBackend is Owned, Precision, StateTransferrable, TrustClient, Util { bytes32 public standard = 'Token 0.1'; bytes32 public name; bytes32 public symbol; bool public allowTransactions; event Approval(address indexed from, address indexed spender, uint256 amount); mapping (address => uint256) public balanceOf; mapping (address => mapping (address => uint256)) public allowance; event Transfer(address indexed from, address indexed to, uint256 value); uint256 public totalSupply; address public hotWalletAddress; address public assetAddress; address public oversightAddress; address public membershipAddress; mapping (address => bool) public frozenAccount; mapping (address => address[]) public allowanceIndex; mapping (address => mapping (address => bool)) public allowanceActive; address[] public accountIndex; mapping (address => bool) public accountActive; bool public isActive; uint256 public treasuryBalance; mapping (address => uint256) public feeCharge; address[] public feeChargeIndex; mapping (address => bool) feeActive; event FrozenFunds(address target, bool frozen); event PrecisionSet(address indexed from, uint8 precision); event TransactionsShutDown(address indexed from); event FeeSetup(address indexed from, address indexed target, uint256 amount); /** * Constructor. * * @param tokenName Name of the Token * @param tokenSymbol The Token Symbol */ function DCAssetBackend(bytes32 tokenSymbol, bytes32 tokenName) { isActive = true; name = tokenName; symbol = tokenSymbol; decimals = 6; allowTransactions = true; } /* --------------- modifiers --------------*/ /** * Makes sure a method is only called by an overseer. */ modifier onlyOverseer { assert(msg.sender == oversightAddress); _ } /** * Make sure only the front end Asset can call the transfer methods */ modifier onlyAsset { assert(msg.sender == assetAddress); _ } /* --------------- setter methods, only for the unlocked state --------------*/ /** * Sets the hot wallet contract address * * @param addr Address of the Hotwallet */ function setHotWallet(address addr) onlyOwnerUnlocked setter { hotWalletAddress = addr; } /** * Sets the token facade contract address * * @param addr Address of the front-end Asset */ function setAsset(address addr) onlyOwnerUnlocked setter { assetAddress = addr; } /** * Sets the membership contract address * * @param addr Address of the membership contract */ function setMembership(address addr) onlyOwnerUnlocked setter { membershipAddress = addr; } /** * Sets the oversight address (not the contract). * * @param addr The oversight contract address. */ function setOversight(address addr) onlyOwnerUnlocked setter { oversightAddress = addr; } /** * Sets the total supply * * @param total Total supply of the asset. */ function setTotalSupply(uint256 total) onlyOwnerUnlocked setter { totalSupply = total; } /** * Set the Token Standard the contract applies to. * * @param std the Standard. */ function setStandard(bytes32 std) onlyOwnerUnlocked setter { standard = std; } /** * Sets the name of the contraxt * * @param _name the name. */ function setName(bytes32 _name) onlyOwnerUnlocked setter { name = _name; } /** * Sets the symbol * * @param sym The Symbol */ function setSymbol(bytes32 sym) onlyOwnerUnlocked setter { symbol = sym; } /** * Sets the precision * * @param precision Amount of decimals */ function setPrecisionDirect(uint8 precision) onlyOwnerUnlocked { decimals = precision; PrecisionSet(msg.sender, precision); } /** * Sets the balance of a certain account. * * @param addr Address of the account * @param amount Amount of assets to set on the account */ function setAccountBalance(address addr, uint256 amount) onlyOwnerUnlocked { balanceOf[addr] = amount; activateAccount(addr); } /** * Sets an allowance from a specific account to a specific account. * * @param from From-part of the allowance * @param to To-part of the allowance * @param amount Amount of the allowance */ function setAccountAllowance(address from, address to, uint256 amount) onlyOwnerUnlocked { allowance[from][to] = amount; activateAllowanceRecord(from, to); } /** * Sets the treasure balance to a certain account. * * @param amount Amount of assets to pre-set in the treasury */ function setTreasuryBalance(uint256 amount) onlyOwnerUnlocked { treasuryBalance = amount; } /** * Sets a certain account on frozen/unfrozen * * @param addr Account that will be frozen/unfrozen * @param frozen Boolean to freeze or unfreeze */ function setAccountFrozenStatus(address addr, bool frozen) onlyOwnerUnlocked { activateAccount(addr); frozenAccount[addr] = frozen; } /* --------------- main token methods --------------*/ /** * @notice Transfer `_amount` from `_caller` to `_to`. * * @param _caller Origin address * @param _to Address that will receive. * @param _amount Amount to be transferred. */ function transfer(address _caller, address _to, uint256 _amount) onlyAsset returns (bool success) { assert(allowTransactions); assert(!frozenAccount[_caller]); assert(balanceOf[_caller] >= _amount); assert(balanceOf[_to] + _amount >= balanceOf[_to]); activateAccount(_caller); activateAccount(_to); balanceOf[_caller] -= _amount; if (_to == address(this)) treasuryBalance += _amount; else { uint256 fee = feeFor(_caller, _to, _amount); balanceOf[_to] += _amount - fee; treasuryBalance += fee; } Transfer(_caller, _to, _amount); return true; } /** * @notice Transfer `_amount` from `_from` to `_to`, invoked by `_caller`. * * @param _caller Invoker of the call (owner of the allowance) * @param _from Origin address * @param _to Address that will receive * @param _amount Amount to be transferred. * @return result of the method call */ function transferFrom(address _caller, address _from, address _to, uint256 _amount) onlyAsset returns (bool success) { assert(allowTransactions); assert(!frozenAccount[_caller]); assert(!frozenAccount[_from]); assert(balanceOf[_from] >= _amount); assert(balanceOf[_to] + _amount >= balanceOf[_to]); assert(_amount <= allowance[_from][_caller]); balanceOf[_from] -= _amount; uint256 fee = feeFor(_from, _to, _amount); balanceOf[_to] += _amount - fee; treasuryBalance += fee; allowance[_from][_caller] -= _amount; activateAccount(_from); activateAccount(_to); activateAccount(_caller); Transfer(_from, _to, _amount); return true; } /** * @notice Approve Approves spender `_spender` to transfer `_amount` from `_caller` * * @param _caller Address that grants the allowance * @param _spender Address that receives the cheque * @param _amount Amount on the cheque * @param _extraData Consequential contract to be executed by spender in same transcation. * @return result of the method call */ function approveAndCall(address _caller, address _spender, uint256 _amount, bytes _extraData) onlyAsset returns (bool success) { assert(allowTransactions); assert(!frozenAccount[_caller]); allowance[_caller][_spender] = _amount; activateAccount(_caller); activateAccount(_spender); activateAllowanceRecord(_caller, _spender); TokenRecipient spender = TokenRecipient(_spender); assert(Relay(assetAddress).relayReceiveApproval(_caller, _spender, _amount, _extraData)); Approval(_caller, _spender, _amount); return true; } /** * @notice Approve Approves spender `_spender` to transfer `_amount` from `_caller` * * @param _caller Address that grants the allowance * @param _spender Address that receives the cheque * @param _amount Amount on the cheque * @return result of the method call */ function approve(address _caller, address _spender, uint256 _amount) onlyAsset returns (bool success) { assert(allowTransactions); assert(!frozenAccount[_caller]); allowance[_caller][_spender] = _amount; activateAccount(_caller); activateAccount(_spender); activateAllowanceRecord(_caller, _spender); Approval(_caller, _spender, _amount); return true; } /* --------------- multisig admin methods --------------*/ /** * @notice Mints `mintedAmount` new tokens to the hotwallet `hotWalletAddress`. * * @param mintedAmount Amount of new tokens to be minted. */ function mint(uint256 mintedAmount) multisig(sha3(msg.data)) { activateAccount(hotWalletAddress); balanceOf[hotWalletAddress] += mintedAmount; totalSupply += mintedAmount; } /** * @notice Destroys `destroyAmount` new tokens from the hotwallet `hotWalletAddress` * * @param destroyAmount Amount of new tokens to be minted. */ function destroyTokens(uint256 destroyAmount) multisig(sha3(msg.data)) { assert(balanceOf[hotWalletAddress] >= destroyAmount); activateAccount(hotWalletAddress); balanceOf[hotWalletAddress] -= destroyAmount; totalSupply -= destroyAmount; } /** * @notice Transfers `amount` from the treasury to `to` * * @param to Address to transfer to * @param amount Amount to transfer from treasury */ function transferFromTreasury(address to, uint256 amount) multisig(sha3(msg.data)) { assert(treasuryBalance >= amount); treasuryBalance -= amount; balanceOf[to] += amount; activateAccount(to); } /* --------------- multisig emergency methods --------------*/ /** * @notice Sets allow transactions to `allow` * * @param allow Allow or disallow transactions */ function voteAllowTransactions(bool allow) multisig(sha3(msg.data)) { if (allow == allowTransactions) throw; allowTransactions = allow; } /** * @notice Destructs the contract and sends remaining `this.balance` Ether to `beneficiary` * * @param beneficiary Beneficiary of remaining Ether on contract */ function voteSuicide(address beneficiary) multisig(sha3(msg.data)) { selfdestruct(beneficiary); } /** * @notice Sets frozen to `freeze` for account `target` * * @param addr Address to be frozen/unfrozen * @param freeze Freeze/unfreeze account */ function freezeAccount(address addr, bool freeze) multisig(sha3(msg.data)) { frozenAccount[addr] = freeze; activateAccount(addr); } /** * @notice Seizes `seizeAmount` of tokens from `address` and transfers it to hotwallet * * @param addr Adress to seize tokens from * @param amount Amount of tokens to seize */ function seizeTokens(address addr, uint256 amount) multisig(sha3(msg.data)) { assert(balanceOf[addr] >= amount); assert(frozenAccount[addr]); activateAccount(addr); balanceOf[addr] -= amount; balanceOf[hotWalletAddress] += amount; } /* --------------- overseer methods for emergency --------------*/ /** * @notice Shuts down all transaction and approval options on the asset contract */ function shutdownTransactions() onlyOverseer { allowTransactions = false; TransactionsShutDown(msg.sender); } /* --------------- helper methods for siphoning --------------*/ function extractAccountAllowanceRecordLength(address addr) returns (uint256 len) { return allowanceIndex[addr].length; } function extractAccountLength() returns (uint256 length) { return accountIndex.length; } /* --------------- private methods --------------*/ function activateAccount(address addr) internal { if (!accountActive[addr]) { accountActive[addr] = true; accountIndex.push(addr); } } function activateAllowanceRecord(address from, address to) internal { if (!allowanceActive[from][to]) { allowanceActive[from][to] = true; allowanceIndex[from].push(to); } } function feeFor(address a, address b, uint256 amount) returns (uint256 value) { if (membershipAddress == address(0x0)) return 0; return DVIP(membershipAddress).feeFor(a, b, amount); } } /** * @title DCAssetFacade, Facade for the underlying back-end dcasset token contract. Allow to be updated later. * * @author P.S.D. Reitsma, peter@decentralizedcapital.com * */ contract DCAsset is TokenBase, StateTransferrable, TrustClient, Relay { address public backendContract; /** * Constructor * * */ function DCAsset(address _backendContract) { backendContract = _backendContract; } function standard() constant returns (bytes32 std) { return DCAssetBackend(backendContract).standard(); } function name() constant returns (bytes32 nm) { return DCAssetBackend(backendContract).name(); } function symbol() constant returns (bytes32 sym) { return DCAssetBackend(backendContract).symbol(); } function decimals() constant returns (uint8 precision) { return DCAssetBackend(backendContract).decimals(); } function allowance(address from, address to) constant returns (uint256 res) { return DCAssetBackend(backendContract).allowance(from, to); } /* --------------- multisig admin methods --------------*/ /** * @notice Sets the backend contract to `_backendContract`. Can only be switched by multisig. * * @param _backendContract Address of the underlying token contract. */ function setBackend(address _backendContract) multisig(sha3(msg.data)) { backendContract = _backendContract; } /* --------------- main token methods --------------*/ /** * @notice Returns the balance of `_address`. * * @param _address The address of the balance. */ function balanceOf(address _address) constant returns (uint256 balance) { return DCAssetBackend(backendContract).balanceOf(_address); } /** * @notice Returns the total supply of the token * */ function totalSupply() constant returns (uint256 balance) { return DCAssetBackend(backendContract).totalSupply(); } /** * @notice Transfer `_amount` to `_to`. * * @param _to Address that will receive. * @param _amount Amount to be transferred. */ function transfer(address _to, uint256 _amount) returns (bool success) { if (!DCAssetBackend(backendContract).transfer(msg.sender, _to, _amount)) throw; Transfer(msg.sender, _to, _amount); return true; } /** * @notice Approve Approves spender `_spender` to transfer `_amount`. * * @param _spender Address that receives the cheque * @param _amount Amount on the cheque * @param _extraData Consequential contract to be executed by spender in same transcation. * @return result of the method call */ function approveAndCall(address _spender, uint256 _amount, bytes _extraData) returns (bool success) { if (!DCAssetBackend(backendContract).approveAndCall(msg.sender, _spender, _amount, _extraData)) throw; Approval(msg.sender, _spender, _amount); return true; } /** * @notice Approve Approves spender `_spender` to transfer `_amount`. * * @param _spender Address that receives the cheque * @param _amount Amount on the cheque * @return result of the method call */ function approve(address _spender, uint256 _amount) returns (bool success) { if (!DCAssetBackend(backendContract).approve(msg.sender, _spender, _amount)) throw; Approval(msg.sender, _spender, _amount); return true; } /** * @notice Transfer `_amount` from `_from` to `_to`. * * @param _from Origin address * @param _to Address that will receive * @param _amount Amount to be transferred. * @return result of the method call */ function transferFrom(address _from, address _to, uint256 _amount) returns (bool success) { if (!DCAssetBackend(backendContract).transferFrom(msg.sender, _from, _to, _amount)) throw; Transfer(_from, _to, _amount); return true; } /** * @notice Returns fee for transferral of `_amount` from `_from` to `_to`. * * @param _from Origin address * @param _to Address that will receive * @param _amount Amount to be transferred. * @return height of the fee */ function feeFor(address _from, address _to, uint256 _amount) returns (uint256 amount) { return DCAssetBackend(backendContract).feeFor(_from, _to, _amount); } /* --------------- to be called by backend --------------*/ function relayReceiveApproval(address _caller, address _spender, uint256 _amount, bytes _extraData) returns (bool success) { assert(msg.sender == backendContract); TokenRecipient spender = TokenRecipient(_spender); spender.receiveApproval(_caller, _amount, this, _extraData); return true; } } |