USDQ Stablecoin by Q DAO v1.0

0x4954db6391f4feb5468b6b943d4935353596aec9 Copy

ERC20

This contract is an ERC20 token.

Name USDQ Stablecoin by Q DAO v1.0

Symbol USDQ

Decimals 18

Total Supply 5,531,633 USDQ

About

USDQ (USDQ) is a cryptocurrency and operates on the Ethereum platform. USDQ has a current supply of 5,400,096.16524405 with 0 in circulation. The last known price of USDQ is 1.20029796 USD and is down -33.32 over the last 24 hours. It is currently trading on 1 active market(s) with $39.66 traded over the last 24 hours. More information can be found at https://usdq.platinum.fund/.

Stats

Public Functions 24

Event Types 17

Code Size 15,707 bytes

Events (17)

Approval Event

Parameters

owner	address
spender	address
value	uint256

BlacklistedAddressAdded Event

Parameters

addr

address

BlacklistedAddressRemoved Event

Parameters

addr

address

Burn Event

Parameters

burner	address
value	uint256

GovernanceContractAdded Event

Parameters

addr

address

GovernanceContractRemoved Event

Parameters

addr

address

Mint Event

Parameters

to	address
amount	uint256

OperationCancelled Event

Parameters

operation	bytes32
lastCanceller	address

OperationCreated Event

Parameters

operation	bytes32
howMany	uint
ownersCount	uint
proposer	address

OperationDownvoted Event

Parameters

operation	bytes32
votes	uint
ownersCount	uint
downvoter	address

OperationPerformed Event

Parameters

operation	bytes32
howMany	uint
ownersCount	uint
performer	address

OperationUpvoted Event

Parameters

operation	bytes32
votes	uint
howMany	uint
ownersCount	uint
upvoter	address

OwnershipRenounced Event

Parameters

previousOwner

address

OwnershipTransferred Event

Parameters

previousOwner	address
newOwner	address

Pause Event

Parameters

Transfer Event

Parameters

from	address
to	address
value	uint256

Unpause Event

Parameters

Constants (1)

DECIMALS Constant

uint8

State Variables (18)

name Variable

string

symbol Variable

string

decimals Variable

uint8

paused Variable

bool

howManyOwnersDecide Variable

uint256

blacklist Variable

mapping(address => bool)

governanceContracts Variable

mapping(address => bool)

ownersIndices Variable

mapping(address => uint)

allOperationsIndicies Variable

mapping(bytes32 => uint)

votesMaskByOperation Variable

mapping(bytes32 => uint256)

votesCountByOperation Variable

mapping(bytes32 => uint256)

allowed Variable

mapping(address => mapping(address => uint256))

Internal Variable

balances Variable

mapping(address => uint256)

Internal Variable

totalSupply_ Variable

uint256

Internal Variable

owners Variable

address[]

Internal Variable

allOperations Variable

bytes32[]

Internal Variable

insideCallSender Variable

address

Internal Variable

insideCallCount Variable

uint256

Internal Variable

Functions Expand All Collapse All

isOwner

Parameters

Name	Type
wallet	address

Properties

Visibility public

Mutability constant

Source Code

function isOwner(address wallet) public constant returns (bool) {
  return ownersIndices[wallet] > 0;
}

ownersCount

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function ownersCount() public view returns (uint256) {
  return owners.length;
}

allOperationsCount

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function allOperationsCount() public view returns (uint256) {
  return allOperations.length;
}

cancelPending

Parameters

Name	Type
operation	bytes32

Properties

Visibility public

Mutability transaction

Modifiers

onlyAnyOwner checks for the following:

Requirements

UNKNOWN VALUE must not be equal to 0

Source Code

function cancelPending(bytes32 operation) public onlyAnyOwner {
  uint256 ownerIndex = ownersIndices[msg.sender] - 1;
  require(
    (votesMaskByOperation[operation] & (2**ownerIndex)) != 0,
    "cancelPending: operation not found for this user"
  );
  votesMaskByOperation[operation] &= ~(2**ownerIndex);
  uint256 operationVotesCount = votesCountByOperation[operation] - 1;
  votesCountByOperation[operation] = operationVotesCount;
  emit OperationDownvoted(
    operation,
    operationVotesCount,
    owners.length,
    msg.sender
  );
  if (operationVotesCount == 0) {
    deleteOperation(operation);
    emit OperationCancelled(operation, msg.sender);
  }
}

transferOwnership

Parameters

Name	Type
_newOwner	address
_oldOwner	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyManyOwners checks for the following:

Requirements

_newOwner must not be equal to UNKNOWN VALUE

Source Code

function transferOwnership(address _newOwner, address _oldOwner)
  public
  onlyManyOwners
{
  _transferOwnership(_newOwner, _oldOwner);
}

pause

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyManyOwners checks for the following:

whenNotPaused checks for the following:

paused must not be true

Source Code

function pause() public onlyManyOwners whenNotPaused {
  paused = true;
  emit Pause();
}

unpause

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyManyOwners checks for the following:

whenPaused checks for the following:

paused must be true

Source Code

function unpause() public onlyManyOwners whenPaused {
  paused = false;
  emit Unpause();
}

addAddressToGovernanceContract

Parameters

Name	Type
addr	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyManyOwners checks for the following:

Source Code

function addAddressToGovernanceContract(address addr)
  public
  onlyManyOwners
  returns (bool success)
{
  if (!governanceContracts[addr]) {
    governanceContracts[addr] = true;
    emit GovernanceContractAdded(addr);
    success = true;
  }
}

removeAddressFromGovernanceContract

Parameters

Name	Type
addr	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyManyOwners checks for the following:

Source Code

function removeAddressFromGovernanceContract(address addr)
  public
  onlyManyOwners
  returns (bool success)
{
  if (governanceContracts[addr]) {
    governanceContracts[addr] = false;
    emit GovernanceContractRemoved(addr);
    success = true;
  }
}

addAddressToBlacklist

Parameters

Name	Type
addr	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyGovernanceContracts checks for the following:

Source Code

function addAddressToBlacklist(address addr)
  public
  onlyGovernanceContracts()
  returns (bool success)
{
  if (!blacklist[addr]) {
    blacklist[addr] = true;
    emit BlacklistedAddressAdded(addr);
    success = true;
  }
}

removeAddressFromBlacklist

Parameters

Name	Type
addr	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyGovernanceContracts checks for the following:

Source Code

function removeAddressFromBlacklist(address addr)
  public
  onlyGovernanceContracts()
  returns (bool success)
{
  if (blacklist[addr]) {
    blacklist[addr] = false;
    emit BlacklistedAddressRemoved(addr);
    success = true;
  }
}

totalSupply

Parameters

This function has no parameters.

Properties

Visibility public

Mutability view

Source Code

function totalSupply() public view returns (uint256) {
  return totalSupply_;
}

balanceOf

Parameters

Name	Type
_owner	address

Properties

Visibility public

Mutability view

Source Code

function balanceOf(address _owner) public view returns (uint256) {
  return balances[_owner];
}

transfer

Parameters

Name	Type
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Requirements

blacklist for the sender's address must not be true

_value must be less than or equal to balances for the sender's address

_to must not be equal to UNKNOWN VALUE

Source Code

function transfer(address _to, uint256 _value)
  public
  whenNotPaused
  returns (bool)
{
  require(!blacklist[msg.sender]);
  return super.transfer(_to, _value);
}

allowance

Parameters

Name	Type
_owner	address
_spender	address

Properties

Visibility public

Mutability view

Source Code

function allowance(address _owner, address _spender)
  public
  view
  returns (uint256)
{
  return allowed[_owner][_spender];
}

transferFrom

Parameters

Name	Type
_from	address
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Requirements

blacklist for _from must not be true

_value must be less than or equal to balances for _from

_value must be less than or equal to allowed for _from for the sender's address

_to must not be equal to UNKNOWN VALUE

Source Code

function transferFrom(
  address _from,
  address _to,
  uint256 _value
) public whenNotPaused returns (bool) {
  require(!blacklist[_from]);
  return super.transferFrom(_from, _to, _value);
}

approve

Parameters

Name	Type
_spender	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Source Code

function approve(address _spender, uint256 _value)
  public
  whenNotPaused
  returns (bool)
{
  return super.approve(_spender, _value);
}

increaseApproval

Parameters

Name	Type
_spender	address
_addedValue	uint256

Properties

Visibility public

Mutability transaction

Source Code

function increaseApproval(address _spender, uint256 _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;
}

decreaseApproval

Parameters

Name	Type
_spender	address
_subtractedValue	uint256

Properties

Visibility public

Mutability transaction

Source Code

function decreaseApproval(address _spender, uint256 _subtractedValue)
  public
  returns (bool)
{
  uint256 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;
}

increaseApproval

Parameters

Name	Type
_spender	address
_addedValue	uint

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Source Code

function increaseApproval(address _spender, uint256 _addedValue)
  public
  whenNotPaused
  returns (bool success)
{
  return super.increaseApproval(_spender, _addedValue);
}

decreaseApproval

Parameters

Name	Type
_spender	address
_subtractedValue	uint

Properties

Visibility public

Mutability transaction

Modifiers

whenNotPaused checks for the following:

paused must not be true

Source Code

function decreaseApproval(address _spender, uint256 _subtractedValue)
  public
  whenNotPaused
  returns (bool success)
{
  return super.decreaseApproval(_spender, _subtractedValue);
}

mint

Parameters

Name	Type
_to	address
_amount	uint256

Properties

Visibility public

Mutability transaction

Modifiers

onlyGovernanceContracts checks for the following:

Source Code

function mint(address _to, uint256 _amount)
  external
  onlyGovernanceContracts()
  returns (bool)
{
  totalSupply_ = totalSupply_.add(_amount);
  balances[_to] = balances[_to].add(_amount);
  emit Mint(_to, _amount);
  emit Transfer(address(0), _to, _amount);
  return true;
}

approveForOtherContracts

Parameters

Name	Type
_sender	address
_spender	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

onlyGovernanceContracts checks for the following:

Source Code

function approveForOtherContracts(
  address _sender,
  address _spender,
  uint256 _value
) external onlyGovernanceContracts() {
  allowed[_sender][_spender] = _value;
  emit Approval(_sender, _spender, _value);
}

burnFrom

Parameters

Name	Type
_to	address
_amount	uint256

Properties

Visibility public

Mutability transaction

Modifiers

onlyGovernanceContracts checks for the following:

Requirements

blacklist for the sender's address must not be true

_value must be less than or equal to balances for _from

_value must be less than or equal to allowed for _from for the sender's address

_to must not be equal to UNKNOWN VALUE

_amount must be less than or equal to balances for the sender's address

Source Code

function burnFrom(address _to, uint256 _amount)
  external
  onlyGovernanceContracts()
  returns (bool)
{
  allowed[_to][msg.sender] = _amount;
  transferFrom(_to, msg.sender, _amount);
  _burn(msg.sender, _amount);
  return true;
}

Internal Functions Expand All Collapse All

Internal functions are parts of the contract that can't be used directly, but instead are used by the public functions listed above.

internal TrueBurnableToken._burn

Parameters

Name	Type
_who	address
_value	uint256

Properties

Visibility internal

Mutability transaction

Requirements

_amount must be less than or equal to balances for the sender's address

Source Code

function _burn(address _who, uint256 _value) internal {
  require(_value <= balances[_who]);

  balances[_who] = balances[_who].sub(_value);
  totalSupply_ = totalSupply_.sub(_value);
  emit Burn(_who, _value);
  emit Transfer(_who, address(0), _value);
}

internal Multiownable.checkHowManyOwners

Parameters

Name	Type
howMany	uint

Properties

Visibility internal

Mutability transaction

Requirements

ownerIndex must be less than the number of values in owners

UNKNOWN VALUE must be equal to 0

Source Code

function checkHowManyOwners(uint256 howMany) internal returns (bool) {
  if (insideCallSender == msg.sender) {
    require(
      howMany <= insideCallCount,
      "checkHowManyOwners: nested owners modifier check require more owners"
    );
    return true;
  }

  uint256 ownerIndex = ownersIndices[msg.sender] - 1;
  require(
    ownerIndex < owners.length,
    "checkHowManyOwners: msg.sender is not an owner"
  );
  bytes32 operation = keccak256(abi.encodePacked(msg.data));

  require(
    (votesMaskByOperation[operation] & (2**ownerIndex)) == 0,
    "checkHowManyOwners: owner already voted for the operation"
  );
  votesMaskByOperation[operation] |= (2**ownerIndex);
  uint256 operationVotesCount = votesCountByOperation[operation] + 1;
  votesCountByOperation[operation] = operationVotesCount;
  if (operationVotesCount == 1) {
    allOperationsIndicies[operation] = allOperations.length;
    allOperations.push(operation);
    emit OperationCreated(operation, howMany, owners.length, msg.sender);
  }
  emit OperationUpvoted(
    operation,
    operationVotesCount,
    howMany,
    owners.length,
    msg.sender
  );

  // If enough owners confirmed the same operation
  if (votesCountByOperation[operation] == howMany) {
    deleteOperation(operation);
    emit OperationPerformed(operation, howMany, owners.length, msg.sender);
    return true;
  }

  return false;
}

internal Multiownable.deleteOperation

Parameters

Name	Type
operation	bytes32

Properties

Visibility internal

Mutability transaction

Source Code

function deleteOperation(bytes32 operation) internal {
  uint256 index = allOperationsIndicies[operation];
  if (index < allOperations.length - 1) {
    // Not last
    allOperations[index] = allOperations[allOperations.length - 1];
    allOperationsIndicies[allOperations[index]] = index;
  }
  allOperations.length--;

  delete votesMaskByOperation[operation];
  delete votesCountByOperation[operation];
  delete allOperationsIndicies[operation];
}

internal Multiownable._transferOwnership

Parameters

Name	Type
_newOwner	address
_oldOwner	address

Properties

Visibility internal

Mutability transaction

Requirements

_newOwner must not be equal to UNKNOWN VALUE

Source Code

function _transferOwnership(address _newOwner, address _oldOwner) internal {
  require(_newOwner != address(0));

  for (uint256 i = 0; i < owners.length; i++) {
    if (_oldOwner == owners[i]) {
      owners[i] = _newOwner;
      ownersIndices[_newOwner] = ownersIndices[_oldOwner];
      ownersIndices[_oldOwner] = 0;
      break;
    }
  }
  emit OwnershipTransferred(_oldOwner, _newOwner);
}

USDQ Stablecoin by Q DAO v1.0

ERC20

About link description

Stats

Events (17) keyboard_arrow_up

Approval Event

Parameters help Event parameters list the data that an event contains.

BlacklistedAddressAdded Event

Parameters help Event parameters list the data that an event contains.

BlacklistedAddressRemoved Event

Parameters help Event parameters list the data that an event contains.

Burn Event

Parameters help Event parameters list the data that an event contains.

GovernanceContractAdded Event

Parameters help Event parameters list the data that an event contains.

GovernanceContractRemoved Event

Parameters help Event parameters list the data that an event contains.

Mint Event

Parameters help Event parameters list the data that an event contains.

OperationCancelled Event

Parameters help Event parameters list the data that an event contains.

OperationCreated Event

Parameters help Event parameters list the data that an event contains.

OperationDownvoted Event

Parameters help Event parameters list the data that an event contains.

OperationPerformed Event

Parameters help Event parameters list the data that an event contains.

OperationUpvoted Event

Parameters help Event parameters list the data that an event contains.

OwnershipRenounced Event

Parameters help Event parameters list the data that an event contains.

OwnershipTransferred Event

Parameters help Event parameters list the data that an event contains.

Pause Event

Parameters help Event parameters list the data that an event contains.

Transfer Event

Parameters help Event parameters list the data that an event contains.

Unpause Event

Parameters help Event parameters list the data that an event contains.

Constants (1) keyboard_arrow_up

DECIMALS Constant

State Variables (18) keyboard_arrow_up

name Variable

symbol Variable

decimals Variable

paused Variable

howManyOwnersDecide Variable

blacklist Variable

governanceContracts Variable

ownersIndices Variable

allOperationsIndicies Variable

votesMaskByOperation Variable

votesCountByOperation Variable

allowed Variable

balances Variable

totalSupply_ Variable

owners Variable

allOperations Variable

insideCallSender Variable

insideCallCount Variable

Functions Expand All Collapse All

isOwner keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

ownersCount keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

allOperationsCount keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Source Code

cancelPending keyboard_arrow_up

Parameters help Function parameters list what input the function expects from the user. Each parameter must be given a value.

Properties

Modifiers help Modifiers are additions to a function that typically make various checks before the function is run.

onlyAnyOwner checks for the following:

Requirements help Requirements are checks that the function makes when it runs, and give you insight on what conditions are required for the function to succeed.

Source Code

About

Events (17)

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Constants (1)

State Variables (18)

isOwner

Parameters

ownersCount

Parameters

allOperationsCount

Parameters

cancelPending

Parameters

Modifiers

Requirements

transferOwnership

Parameters

Modifiers

Requirements

pause

Parameters

Modifiers

unpause

Parameters

Modifiers

addAddressToGovernanceContract

Parameters

Modifiers

removeAddressFromGovernanceContract

Parameters

Modifiers

addAddressToBlacklist

Parameters

Modifiers

removeAddressFromBlacklist

Parameters

Modifiers

totalSupply

Parameters

balanceOf

Parameters

transfer

Parameters

Modifiers

Requirements

allowance

Parameters

transferFrom

Parameters

Modifiers