// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
/**
* @dev Implementation of the {IERC20} interface.
*
* This implementation is agnostic to the way tokens are created. This means
* that a supply mechanism has to be added in a derived contract using {_mint}.
* For a generic mechanism see {ERC20PresetMinterPauser}.
*
* TIP: For a detailed writeup see our guide
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
* to implement supply mechanisms].
*
* We have followed general OpenZeppelin guidelines: functions revert instead
* of returning `false` on failure. This behavior is nonetheless conventional
* and does not conflict with the expectations of ERC20 applications.
*
* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
* This allows applications to reconstruct the allowance for all accounts just
* by listening to said events. Other implementations of the EIP may not emit
* these events, as it isn't required by the specification.
*
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
* functions have been added to mitigate the well-known issues around setting
* allowances. See {IERC20-approve}.
*/
contract ERC20 is Context, IERC20 {
mapping (address => uint256) internal _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
/**
* @dev Sets the values for {name} and {symbol}.
*
* The defaut value of {decimals} is 18. To select a different value for
* {decimals} you should overload it.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name_, string memory symbol_) {
_name = name_;
_symbol = symbol_;
}
/**
* @dev Returns the name of the token.
*/
function name() external view virtual returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() external view virtual returns (string memory) {
return _symbol;
}
/**
* @dev Returns the number of decimals used to get its user representation.
* For example, if `decimals` equals `2`, a balance of `505` tokens should
* be displayed to a user as `5,05` (`505 / 10 ** 2`).
*
* Tokens usually opt for a value of 18, imitating the relationship between
* Ether and Wei. This is the value {ERC20} uses, unless this function is
* overloaded;
*
* NOTE: This information is only used for _display_ purposes: it in
* no way affects any of the arithmetic of the contract, including
* {IERC20-balanceOf} and {IERC20-transfer}.
*/
function decimals() external view virtual returns (uint8) {
return 18;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() external view virtual override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) external view virtual override returns (uint256) {
return _balances[account];
}
/**
* @dev See {IERC20-transfer}.
*
* Requirements:
*
* - `recipient` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address recipient, uint256 amount) external virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) external view virtual override returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) external virtual override returns (bool) {
_approve(_msgSender(), spender, amount);
return true;
}
/**
* @dev See {IERC20-transferFrom}.
*
* Emits an {Approval} event indicating the updated allowance. This is not
* required by the EIP. See the note at the beginning of {ERC20}.
*
* Requirements:
*
* - `sender` and `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
* - the caller must have allowance for ``sender``'s tokens of at least
* `amount`.
*/
function transferFrom(address sender, address recipient, uint256 amount) external virtual override returns (bool) {
_transfer(sender, recipient, amount);
uint256 currentAllowance = _allowances[sender][_msgSender()];
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
_approve(sender, _msgSender(), currentAllowance - amount);
return true;
}
/**
* @dev Atomically increases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function increaseAllowance(address spender, uint256 addedValue) external virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
return true;
}
/**
* @dev Atomically decreases the allowance granted to `spender` by the caller.
*
* This is an alternative to {approve} that can be used as a mitigation for
* problems described in {IERC20-approve}.
*
* Emits an {Approval} event indicating the updated allowance.
*
* Requirements:
*
* - `spender` cannot be the zero address.
* - `spender` must have allowance for the caller of at least
* `subtractedValue`.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) external virtual returns (bool) {
uint256 currentAllowance = _allowances[_msgSender()][spender];
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
_approve(_msgSender(), spender, currentAllowance - subtractedValue);
return true;
}
/**
* @dev Moves tokens `amount` from `sender` to `recipient`.
*
* This is internal function is equivalent to {transfer}, and can be used to
* e.g. implement automatic token fees, slashing mechanisms, etc.
*
* Emits a {Transfer} event.
*
* Requirements:
*
* - `sender` cannot be the zero address.
* - `recipient` cannot be the zero address.
* - `sender` must have a balance of at least `amount`.
*/
function _transfer(address sender, address recipient, uint256 amount) internal virtual {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
uint256 senderBalance = _balances[sender];
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
_balances[sender] = senderBalance - amount;
_balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
}
/** @dev Creates `amount` tokens and assigns them to `account`, increasing
* the total supply.
*
* Emits a {Transfer} event with `from` set to the zero address.
*
* Requirements:
*
* - `to` cannot be the zero address.
*/
function _mint(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount;
_balances[account] += amount;
emit Transfer(address(0), account, amount);
}
/**
* @dev Destroys `amount` tokens from `account`, reducing the
* total supply.
*
* Emits a {Transfer} event with `to` set to the zero address.
*
* Requirements:
*
* - `account` cannot be the zero address.
* - `account` must have at least `amount` tokens.
*/
function _burn(address account, uint256 amount) internal virtual {
require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account];
require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
_balances[account] = accountBalance - amount;
_totalSupply -= amount;
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
*
* This internal function is equivalent to `approve`, and can be used to
* e.g. set automatic allowances for certain subsystems, etc.
*
* Emits an {Approval} event.
*
* Requirements:
*
* - `owner` cannot be the zero address.
* - `spender` cannot be the zero address.
*/
function _approve(address owner, address spender, uint256 amount) internal virtual {
require(owner != address(0), "ERC20: approve from the zero address");
require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount;
emit Approval(owner, spender, amount);
}
/**
* @dev Hook that is called before any transfer of tokens. This includes
* minting and burning.
*
* Calling conditions:
*
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
* will be to transferred to `to`.
* - when `from` is zero, `amount` tokens will be minted for `to`.
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}
///////////////////////////////////////////////
// QANX STARTS HERE, OPENZEPPELIN CODE ABOVE //
///////////////////////////////////////////////
contract QANX is ERC20 {
// EVENTS TO BE EMITTED UPON LOCKS ARE APPLIED & REMOVED
event LockApplied(address indexed account, uint256 amount, uint32 hardLockUntil, uint32 softLockUntil, uint8 allowedHops);
event LockRemoved(address indexed account);
// INITIALIZE AN ERC20 TOKEN BASED ON THE OPENZEPPELIN VERSION
constructor() ERC20("QANX Token", "QANX") {
// INITIALLY MINT TOTAL SUPPLY TO CREATOR
_mint(_msgSender(), 3333333000 * (10 ** 18));
}
// MAPPING FOR QUANTUM PUBLIC KEY HASHES
mapping (address => bytes32) private _qPubKeyHashes;
// REGISTER QUANTUM PUBLIC KEY HASH OF THE CURRENT ACCOUNT
function setQuantumPubkeyHash(bytes32 qPubKeyHash) external {
_qPubKeyHashes[_msgSender()] = qPubKeyHash;
}
// QUERY A QUANTUM PUBLIC KEY HASH OF A GIVEN ACCOUNT
function getQuantumPubkeyHash(address account) external view virtual returns (bytes32) {
return _qPubKeyHashes[account];
}
// REPRESENTS A LOCK WHICH MIGHT BE APPLIED ON AN ADDRESS
struct Lock {
uint256 tokenAmount; // HOW MANY TOKENS ARE LOCKED
uint32 hardLockUntil; // UNTIL WHEN NO LOCKED TOKENS CAN BE ACCESSED
uint32 softLockUntil; // UNTIL WHEN LOCKED TOKENS CAN BE GRADUALLY RELEASED
uint8 allowedHops; // HOW MANY TRANSFERS LEFT WITH SAME LOCK PARAMS
uint32 lastUnlock; // LAST GRADUAL UNLOCK TIME (SOFTLOCK PERIOD)
uint256 unlockPerSec; // HOW MANY TOKENS ARE UNLOCKABLE EACH SEC FROM HL -> SL
}
// THIS MAPS LOCK PARAMS TO CERTAIN ADDRESSES WHICH RECEIVED LOCKED TOKENS
mapping (address => Lock) private _locks;
// RETURNS LOCK INFORMATION OF A GIVEN ADDRESS
function lockOf(address account) external view virtual returns (Lock memory) {
return _locks[account];
}
// RETURN THE BALANCE OF UNLOCKED AND LOCKED TOKENS COMBINED
function balanceOf(address account) external view virtual override returns (uint256) {
return _balances[account] + _locks[account].tokenAmount;
}
// TRANSFER FUNCTION WITH LOCK PARAMETERS
function transferLocked(address recipient, uint256 amount, uint32 hardLockUntil, uint32 softLockUntil, uint8 allowedHops) external returns (bool) {
// ONLY ONE LOCKED TRANSACTION ALLOWED PER RECIPIENT
require(_locks[recipient].tokenAmount == 0, "Only one lock per address allowed!");
// SENDER MUST HAVE ENOUGH TOKENS (UNLOCKED + LOCKED BALANCE COMBINED)
require(_balances[_msgSender()] + _locks[_msgSender()].tokenAmount >= amount, "Transfer amount exceeds balance");
// IF SENDER HAS ENOUGH UNLOCKED BALANCE, THEN LOCK PARAMS CAN BE CHOSEN
if(_balances[_msgSender()] >= amount){
// DEDUCT SENDER BALANCE
_balances[_msgSender()] = _balances[_msgSender()] - amount;
// APPLY LOCK
return _applyLock(recipient, amount, hardLockUntil, softLockUntil, allowedHops);
}
// OTHERWISE REQUIRE THAT THE CHOSEN LOCK PARAMS ARE SAME / STRICTER (allowedHops) THAN THE SENDER'S
require(
hardLockUntil >= _locks[_msgSender()].hardLockUntil &&
softLockUntil >= _locks[_msgSender()].softLockUntil &&
allowedHops < _locks[_msgSender()].allowedHops
);
// IF SENDER HAS ENOUGH LOCKED BALANCE
if(_locks[_msgSender()].tokenAmount >= amount){
// DECREASE LOCKED BALANCE OF SENDER
_locks[_msgSender()].tokenAmount = _locks[_msgSender()].tokenAmount - amount;
// APPLY LOCK
return _applyLock(recipient, amount, hardLockUntil, softLockUntil, allowedHops);
}
// IF NO CONDITIONS WERE MET SO FAR, DEDUCT FROM THE UNLOCKED BALANCE
_balances[_msgSender()] = _balances[_msgSender()] - (amount - _locks[_msgSender()].tokenAmount);
// THEN SPEND LOCKED BALANCE OF SENDER FIRST
_locks[_msgSender()].tokenAmount = 0;
// APPLY LOCK
return _applyLock(recipient, amount, hardLockUntil, softLockUntil, allowedHops);
}
// APPLIES LOCK TO RECIPIENT WITH SPECIFIED PARAMS AND EMITS A TRANSFER EVENT
function _applyLock(address recipient, uint256 amount, uint32 hardLockUntil, uint32 softLockUntil, uint8 allowedHops) private returns (bool) {
// MAKE SURE THAT SOFTLOCK IS AFTER HARDLOCK
require(softLockUntil > hardLockUntil, "SoftLock must be greater than HardLock!");
// APPLY LOCK, EMIT TRANSFER EVENT
_locks[recipient] = Lock(amount, hardLockUntil, softLockUntil, allowedHops, hardLockUntil, amount / (softLockUntil - hardLockUntil));
emit LockApplied(recipient, amount, hardLockUntil, softLockUntil, allowedHops);
emit Transfer(_msgSender(), recipient, amount);
return true;
}
function lockedBalanceOf(address account) external view virtual returns (uint256) {
return _locks[account].tokenAmount;
}
function unlockedBalanceOf(address account) external view virtual returns (uint256) {
return _balances[account];
}
function unlockableBalanceOf(address account) public view virtual returns (uint256) {
// IF THE HARDLOCK HAS NOT PASSED YET, THERE ARE NO UNLOCKABLE TOKENS
if(block.timestamp < _locks[account].hardLockUntil) {
return 0;
}
// IF THE SOFTLOCK PERIOD PASSED, ALL CURRENTLY TOKENS ARE UNLOCKABLE
if(block.timestamp > _locks[account].softLockUntil) {
return _locks[account].tokenAmount;
}
// OTHERWISE THE PROPORTIONAL AMOUNT IS UNLOCKABLE
return (block.timestamp - _locks[account].lastUnlock) * _locks[account].unlockPerSec;
}
function unlock(address account) external returns (bool) {
// CALCULATE UNLOCKABLE BALANCE
uint256 unlockable = unlockableBalanceOf(account);
// ONLY ADDRESSES OWNING LOCKED TOKENS AND BYPASSED HARDLOCK TIME ARE UNLOCKABLE
require(unlockable > 0 && _locks[account].tokenAmount > 0 && block.timestamp > _locks[account].hardLockUntil, "No unlockable tokens!");
// SET LAST UNLOCK TIME, DEDUCT FROM LOCKED BALANCE & CREDIT TO REGULAR BALANCE
_locks[account].lastUnlock = uint32(block.timestamp);
_locks[account].tokenAmount = _locks[account].tokenAmount - unlockable;
_balances[account] = _balances[account] + unlockable;
// IF NO MORE LOCKED TOKENS LEFT, REMOVE LOCK OBJECT FROM ADDRESS
if(_locks[account].tokenAmount == 0){
delete _locks[account];
emit LockRemoved(account);
}
// UNLOCK SUCCESSFUL
emit Transfer(account, account, unlockable);
return true;
}
}
{
"compilationTarget": {
"QANX.sol": "QANX"
},
"evmVersion": "istanbul",
"libraries": {},
"metadata": {
"bytecodeHash": "ipfs"
},
"optimizer": {
"enabled": false,
"runs": 200
},
"remappings": []
}
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