HoloToken

0x6c6ee5e31d828de241282b9606c8e98ea48526e2 Copy

ERC20

This contract is an ERC20 token.

Name HoloToken

Symbol HOT

Decimals 18

Total Supply 177,619,433,541 HOT

About

Holo (HOT) is a cryptocurrency and operates on the Ethereum platform. Holo has a current supply of 177,619,433,541.14133 with 172,673,864,847.79962 in circulation. The last known price of Holo is 0.00514464 USD and is down -0.85 over the last 24 hours. It is currently trading on 81 active market(s) with $61,385,064.01 traded over the last 24 hours. More information can be found at https://holochain.org/.

Stats

Public Functions 13

Event Types 6

Code Size 9,326 bytes

Library Use

Uses SafeMath for uint256.

Events (6)

Approval Event

Parameters

owner	address
spender	address
value	uint256

Burn Event

Parameters

amount

uint256

Mint Event

Parameters

to	address
amount	uint256

MintingFinished Event

Parameters

OwnershipTransferred Event

Parameters

previousOwner	address
newOwner	address

Transfer Event

Parameters

from	address
to	address
value	uint256

Constants (3)

name Constant

string

HoloToken

symbol Constant

string

HOT

decimals Constant

uint8

State Variables (7)

totalSupply Variable

uint256

mintingFinished Variable

bool

destroyer Variable

address

minter Variable

address

owner Variable

address

balances Variable

mapping(address => uint256)

allowed Variable

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

Internal Variable

Functions Expand All Collapse All

transferOwnership

Parameters

Name	Type
newOwner	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Requirements

newOwner must not be equal to UNKNOWN VALUE

Source Code

function transferOwnership(address newOwner) public onlyOwner {
  require(newOwner != address(0));
  OwnershipTransferred(owner, newOwner);
  owner = newOwner;
}

transfer

Parameters

Name	Type
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

whenMintingFinished checks for the following:

mintingFinished must be true

Requirements

_to must not be equal to UNKNOWN VALUE

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

Source Code

function transfer(address _to, uint256 _value)
  public
  whenMintingFinished
  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);
  Transfer(msg.sender, _to, _value);
  return true;
}

balanceOf

Parameters

Name	Type
_owner	address

Properties

Visibility public

Mutability view

Source Code

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

transferFrom

Parameters

Name	Type
_from	address
_to	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

whenMintingFinished checks for the following:

mintingFinished must be true

Requirements

_to must not be equal to UNKNOWN VALUE

_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

Source Code

function transferFrom(
  address _from,
  address _to,
  uint256 _value
) public whenMintingFinished 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);
  Transfer(_from, _to, _value);
  return true;
}

approve

Parameters

Name	Type
_spender	address
_value	uint256

Properties

Visibility public

Mutability transaction

Modifiers

whenMintingFinished checks for the following:

mintingFinished must be true

Source Code

function approve(address _spender, uint256 _value)
  public
  whenMintingFinished
  returns (bool)
{
  allowed[msg.sender][_spender] = _value;
  Approval(msg.sender, _spender, _value);
  return true;
}

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];
}

increaseApproval

Parameters

Name	Type
_spender	address
_addedValue	uint

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
  );
  Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
  return true;
}

decreaseApproval

Parameters

Name	Type
_spender	address
_subtractedValue	uint

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);
  }
  Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
  return true;
}

setMinter

Parameters

Name	Type
_minter	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function setMinter(address _minter) external onlyOwner {
  minter = _minter;
}

mint

Parameters

Name	Type
_to	address
_amount	uint256

Properties

Visibility public

Mutability transaction

Modifiers

onlyMinter checks for the following:

minter must be equal to the sender's address

canMint checks for the following:

mintingFinished must not be true

Requirements

balances for _to + _amount must be greater than balances for _to

totalSupply must be less than totalSupply + _amount

Source Code

function mint(address _to, uint256 _amount)
  external
  onlyMinter
  canMint
  returns (bool)
{
  require(balances[_to] + _amount > balances[_to]); // Guard against overflow
  require(totalSupply + _amount > totalSupply); // Guard against overflow  (this should never happen)
  totalSupply = totalSupply.add(_amount);
  balances[_to] = balances[_to].add(_amount);
  Mint(_to, _amount);
  return true;
}

finishMinting

Parameters

This function has no parameters.

Properties

Visibility public

Mutability transaction

Modifiers

onlyMinter checks for the following:

minter must be equal to the sender's address

Source Code

function finishMinting() external onlyMinter returns (bool) {
  mintingFinished = true;
  MintingFinished();
  return true;
}

setDestroyer

Parameters

Name	Type
_destroyer	address

Properties

Visibility public

Mutability transaction

Modifiers

onlyOwner checks for the following:

owner must be equal to the sender's address

Source Code

function setDestroyer(address _destroyer) external onlyOwner {
  destroyer = _destroyer;
}

burn

Parameters

Name	Type
_amount	uint256

Properties

Visibility public

Mutability transaction

Modifiers

onlyDestroyer checks for the following:

destroyer must be equal to the sender's address

Requirements

_amount must be greater than 0

_amount must be less than or equal to balances for destroyer

Source Code

function burn(uint256 _amount) external onlyDestroyer {
  require(balances[destroyer] >= _amount && _amount > 0);
  balances[destroyer] = balances[destroyer].sub(_amount);
  totalSupply = totalSupply.sub(_amount);
  Burn(_amount);
}

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.

HoloToken

ERC20

About link description

Stats

Library Use

Events (6) keyboard_arrow_up

Approval 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.

Mint Event

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

MintingFinished 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.

Transfer Event

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

Constants (3) keyboard_arrow_up

name Constant

symbol Constant

decimals Constant

State Variables (7) keyboard_arrow_up

totalSupply Variable

mintingFinished Variable

destroyer Variable

minter Variable

owner Variable

balances Variable

allowed Variable

Functions Expand All Collapse All

transferOwnership 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.

onlyOwner 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

transfer 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.

whenMintingFinished 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

balanceOf 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

transferFrom 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.

whenMintingFinished 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

approve 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.

whenMintingFinished checks for the following:

Source Code

allowance 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

increaseApproval 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

decreaseApproval 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

setMinter 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.

onlyOwner checks for the following:

Source Code

About

Events (6)

Parameters

Parameters

Parameters

Parameters

Parameters

Parameters

Constants (3)

State Variables (7)

transferOwnership

Parameters

Modifiers

Requirements

transfer

Parameters

Modifiers

Requirements

balanceOf

Parameters

transferFrom

Parameters

Modifiers

Requirements

approve

Parameters

Modifiers

allowance

Parameters

increaseApproval

Parameters

decreaseApproval

Parameters

setMinter

Parameters

Modifiers

mint

Parameters

Modifiers

Requirements

finishMinting

Parameters

Modifiers

setDestroyer

Parameters

Modifiers

burn

Parameters

Modifiers

Requirements