// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;/**
* @dev Collection of functions related to the address type
*/libraryAddress{
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/functionisContract(address account) internalviewreturns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in// construction, since the code is only stored at the end of the// constructor execution.uint256 size;
assembly {
size :=extcodesize(account)
}
return size >0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/functionsendValue(addresspayable recipient, uint256 amount) internal{
require(address(this).balance>= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/functionfunctionCall(address target, bytesmemory data) internalreturns (bytesmemory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/functionfunctionCall(address target,
bytesmemory data,
stringmemory errorMessage
) internalreturns (bytesmemory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/functionfunctionCallWithValue(address target,
bytesmemory data,
uint256 value
) internalreturns (bytesmemory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/functionfunctionCallWithValue(address target,
bytesmemory data,
uint256 value,
stringmemory errorMessage
) internalreturns (bytesmemory) {
require(address(this).balance>= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytesmemory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/functionfunctionStaticCall(address target, bytesmemory data) internalviewreturns (bytesmemory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/functionfunctionStaticCall(address target,
bytesmemory data,
stringmemory errorMessage
) internalviewreturns (bytesmemory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytesmemory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/functionfunctionDelegateCall(address target, bytesmemory data) internalreturns (bytesmemory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/functionfunctionDelegateCall(address target,
bytesmemory data,
stringmemory errorMessage
) internalreturns (bytesmemory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytesmemory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/functionverifyCallResult(bool success,
bytesmemory returndata,
stringmemory errorMessage
) internalpurereturns (bytesmemory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if presentif (returndata.length>0) {
// The easiest way to bubble the revert reason is using memory via assemblyassembly {
let returndata_size :=mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
Contract Source Code
File 2 of 6: Context.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;/**
* @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.
*/abstractcontractContext{
function_msgSender() internalviewvirtualreturns (address) {
returnmsg.sender;
}
function_msgData() internalviewvirtualreturns (bytescalldata) {
returnmsg.data;
}
}
Contract Source Code
File 3 of 6: IERC20.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/interfaceIERC20{
/**
* @dev Returns the amount of tokens in existence.
*/functiontotalSupply() externalviewreturns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/functionbalanceOf(address account) externalviewreturns (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.
*/functiontransfer(address recipient, uint256 amount) externalreturns (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.
*/functionallowance(address owner, address spender) externalviewreturns (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.
*/functionapprove(address spender, uint256 amount) externalreturns (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.
*/functiontransferFrom(address sender,
address recipient,
uint256 amount
) externalreturns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/eventTransfer(addressindexedfrom, addressindexed 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.
*/eventApproval(addressindexed owner, addressindexed spender, uint256 value);
}
Contract Source Code
File 4 of 6: Ownable.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;import"../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/abstractcontractOwnableisContext{
addressprivate _owner;
eventOwnershipTransferred(addressindexed previousOwner, addressindexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/functionowner() publicviewvirtualreturns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/modifieronlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/functionrenounceOwnership() publicvirtualonlyOwner{
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/functiontransferOwnership(address newOwner) publicvirtualonlyOwner{
require(newOwner !=address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function_setOwner(address newOwner) private{
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
Contract Source Code
File 5 of 6: SafeERC20.sol
// SPDX-License-Identifier: MITpragmasolidity ^0.8.0;import"../IERC20.sol";
import"../../../utils/Address.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/librarySafeERC20{
usingAddressforaddress;
functionsafeTransfer(
IERC20 token,
address to,
uint256 value
) internal{
_callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
functionsafeTransferFrom(
IERC20 token,
addressfrom,
address to,
uint256 value
) internal{
_callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/functionsafeApprove(
IERC20 token,
address spender,
uint256 value
) internal{
// safeApprove should only be called when setting an initial allowance,// or when resetting it to zero. To increase and decrease it, use// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'require(
(value ==0) || (token.allowance(address(this), spender) ==0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
functionsafeIncreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal{
uint256 newAllowance = token.allowance(address(this), spender) + value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
functionsafeDecreaseAllowance(
IERC20 token,
address spender,
uint256 value
) internal{
unchecked {
uint256 oldAllowance = token.allowance(address(this), spender);
require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
uint256 newAllowance = oldAllowance - value;
_callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/function_callOptionalReturn(IERC20 token, bytesmemory data) private{
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since// we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that// the target address contains contract code and also asserts for success in the low-level call.bytesmemory returndata =address(token).functionCall(data, "SafeERC20: low-level call failed");
if (returndata.length>0) {
// Return data is optionalrequire(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
Contract Source Code
File 6 of 6: SymbiosisTokenVesting.sol
// SPDX-License-Identifier: MITpragmasolidity 0.8.7;import"@openzeppelin/contracts/access/Ownable.sol";
import"@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
/**
* @title SymbiosisTokenVesting
*
* @dev A token holder contract that can release its token balance gradually like a
* typical vesting scheme, with a cliff and vesting period.
* There are 3 types of vesting schedule: CONTINUOUS, MONTHLY (every 30 days), QUARTERLY (every 90 days).
*/contractSymbiosisTokenVestingisOwnable{
// The vesting schedule is time-based (i.e. using block timestamps as opposed to e.g. block numbers), and is// therefore sensitive to timestamp manipulation (which is something miners can do, to a certain degree). Therefore,// it is recommended to avoid using short time durations (less than a minute). Typical vesting schemes, with a// cliff period of a year and a duration of four years, are safe to use.// solhint-disable not-rely-on-timeusingSafeERC20forIERC20;
eventReservedAdded(addressindexed beneficiary, uint256 reserved);
eventTokensReleased(addressindexed beneficiary,
addressindexed transferredTo,
uint256 amount
);
eventTokensWithdrawnByOwner(addressindexed token, uint256 amount);
// 100% in basis pointsuint256publicconstant MAX_BPS =10000;
// private VestingSchedule time constantsuint256privateconstant MONTHLY_TIME =30days;
uint256privateconstant QUARTERLY_TIME =90days;
// SymbiosisTokenVesting namestringpublic name;
// ERC20 token which is being vested
IERC20 public token;
// staking contract addressaddresspublic stakingAddress;
// Durations and timestamps are expressed in UNIX time, the same units as block.timestamp.uint256public cliff; // the cliff time of the token vestinguint256public start; // the start time of the token vestinguint256public duration; // the duration of the token vesting// type of the token vestingenumVestingSchedule {
CONTINUOUS,
MONTHLY,
QUARTERLY
}
VestingSchedule publicimmutable schedule;
// basis points of the initial unlock – after the start and before the end of the cliff perioduint256publicimmutable cliffUnlockedBP;
// total reserved tokens for beneficiariesuint256public reserved;
// reserved tokens to beneficiarymapping(address=>uint256) public reservedForBeneficiary;
// frozen amount for stakingmapping(address=>uint256) public frozenForStakeAmount;
// total released (transferred) tokensuint256public released;
// released (transferred) tokens to beneficiarymapping(address=>uint256) public releasedToBeneficiary;
// array of beneficiaries for gettersaddress[] internal beneficiaries;
/**
* @dev Creates a vesting contract that vests its balance of specific ERC20 token to the
* beneficiaries, gradually in a linear fashion until start + duration. By then all
* of the balance will have vested.
* @param _token ERC20 token which is being vested
* @param _cliffDuration duration in seconds of the cliff in which tokens will begin to vest
* @param _cliffUnlockedBP basis points of initial unlock – after the start and before the end of the cliff period
* @param _start the time (as Unix time) at which point vesting starts
* @param _duration duration in seconds of the period in which the tokens will vest
* @param _schedule type of the token vesting: CONTINUOUS, MONTHLY, QUARTERLY
* @param _name SymbiosisTokenVesting name
*/constructor(
IERC20 _token,
uint256 _start,
uint256 _cliffDuration,
uint256 _cliffUnlockedBP,
uint256 _duration,
VestingSchedule _schedule,
stringmemory _name
) {
require(
address(_token) !=address(0),
"SymbiosisTokenVesting: token is the zero address"
);
require(_duration >0, "SymbiosisTokenVesting: duration is 0");
require(
_cliffDuration <= _duration,
"SymbiosisTokenVesting: cliff is longer than duration"
);
require(
_start + _duration >block.timestamp,
"SymbiosisTokenVesting: final time is before current time"
);
require(
_cliffUnlockedBP <= MAX_BPS,
"SymbiosisTokenVesting: invalid cliff unlocked BP"
);
token = _token;
duration = _duration;
cliff = _start + _cliffDuration;
start = _start;
schedule = _schedule;
name = _name;
cliffUnlockedBP = _cliffUnlockedBP;
}
modifieronlyStaking() {
require(
msg.sender== stakingAddress,
"SymbiosisTokenVesting: caller is not the staking address"
);
_;
}
functionsetStakingAddress(address _stakingAddress) externalonlyOwner{
stakingAddress = _stakingAddress;
}
/**
* @notice Calculates the total amount of vested tokens.
*/functiontotalVested() publicviewreturns (uint256) {
uint256 currentBalance = token.balanceOf(address(this));
return currentBalance + released;
}
/**
* @notice Calculates the amount that has already vested but hasn't been released yet.
* @param _beneficiary Address of vested tokens beneficiary
*/functionreleasableAmount(address _beneficiary)
publicviewreturns (uint256)
{
uint256 releasable = _vestedAmount(_beneficiary) - releasedToBeneficiary[_beneficiary];
uint256 frozen = frozenForStakeAmount[_beneficiary];
return (releasable > frozen) ? (releasable - frozen) : 0;
}
/**
* @notice Get a beneficiary address with current index.
*/functiongetBeneficiary(uint256 index) externalviewreturns (address) {
return beneficiaries[index];
}
/**
* @notice Get an array of beneficiary addresses.
*/functiongetBeneficiaries() externalviewreturns (address[] memory) {
return beneficiaries;
}
/**
* @notice Adds beneficiaries to SymbiosisTokenVesting by owner.
*
* Requirements:
* - can only be called by owner.
*
* @param _beneficiaries Addresses of beneficiaries
* @param _amounts Amounts of tokens reserved for beneficiaries
*/functionaddBeneficiaries(address[] memory _beneficiaries,
uint256[] memory _amounts
) externalonlyOwner{
uint256 len = _beneficiaries.length;
require(len == _amounts.length, "SymbiosisTokenVesting: Array lengths do not match");
uint256 amountToBeneficiaries =0;
for (uint256 i =0; i < len; i++) {
amountToBeneficiaries = amountToBeneficiaries + _amounts[i];
// add new beneficiary to arrayif (reservedForBeneficiary[_beneficiaries[i]] ==0) {
beneficiaries.push(_beneficiaries[i]);
}
reservedForBeneficiary[_beneficiaries[i]] =
reservedForBeneficiary[_beneficiaries[i]] +
_amounts[i];
emit ReservedAdded(_beneficiaries[i], _amounts[i]);
}
reserved = reserved + amountToBeneficiaries;
// check reserved conditionrequire(
reserved <= totalVested(),
"SymbiosisTokenVesting: reserved exceeds totalVested"
);
}
/**
* @notice Withdraws ERC20 token funds by owner (except vested token).
*
* Requirements:
* - can only be called by owner.
*
* @param _token Token address (except vested token)
* @param _amount The amount of token to withdraw
**/functionwithdrawFunds(IERC20 _token, uint256 _amount) externalonlyOwner{
require(
_token != token,
"SymbiosisTokenVesting: vested token is not available for withdrawal"
);
_token.safeTransfer(msg.sender, _amount);
emit TokensWithdrawnByOwner(address(_token), _amount);
}
/**
* @notice Withdraws ERC20 vested token by owner.
*
* Requirements:
* - can only be called by owner.
*
* @param _amount The amount of token to withdraw
**/functionemergencyWithdraw(uint256 _amount) externalonlyOwner{
require(
block.timestamp< start,
"SymbiosisTokenVesting: vesting has already started"
);
token.safeTransfer(msg.sender, _amount);
emit TokensWithdrawnByOwner(address(token), _amount);
}
/**
* @notice Transfers vested tokens to beneficiary.
* @param _beneficiary Address of vested tokens beneficiary
*/functionrelease(address _beneficiary) external{
_release(_beneficiary, _beneficiary);
}
/**
* @notice Transfers vested tokens of sender to specified address.
* @param _transferTo Address to which tokens are transferred
*/functionreleaseToAddress(address _transferTo) external{
_release(msg.sender, _transferTo);
}
functionallocateStake(address _beneficiary, uint256 _amount)
externalonlyStakingreturns (bool)
{
require(
reservedForBeneficiary[_beneficiary] - releasedToBeneficiary[_beneficiary] >= _amount,
"SymbiosisTokenVesting: allocation amount exceeds balance"
);
frozenForStakeAmount[_beneficiary] += _amount;
returntrue;
}
functionunlockStake(address _beneficiary, uint256 _amount)
externalonlyStakingreturns (bool)
{
require(
_amount <= frozenForStakeAmount[_beneficiary],
"SymbiosisTokenVesting: amount exceeds frozen amount for this beneficiary"
);
frozenForStakeAmount[_beneficiary] -= _amount;
returntrue;
}
/**
* @dev Calculates the amount that has already vested.
* @param _beneficiary Address of vested tokens beneficiary
*/function_vestedAmount(address _beneficiary)
privateviewreturns (uint256)
{
uint256 curTimestamp =block.timestamp;
if (curTimestamp < start) {
return0;
} elseif (curTimestamp < cliff) {
return reservedForBeneficiary[_beneficiary] * cliffUnlockedBP / MAX_BPS;
} elseif (curTimestamp >= start + duration) {
return reservedForBeneficiary[_beneficiary];
} else {
return
reservedForBeneficiary[_beneficiary] * cliffUnlockedBP / MAX_BPS +
reservedForBeneficiary[_beneficiary] * (MAX_BPS - cliffUnlockedBP) * _vestedPeriod() / (duration - (cliff - start)) / MAX_BPS;
}
}
/**
* @dev Calculates the duration of period that is already unlocked according to VestingSchedule type.
*/function_vestedPeriod() privateviewreturns (uint256 period) {
period =block.timestamp- cliff; // CONTINUOUS from cliffif (schedule == VestingSchedule.MONTHLY) {
period = period - (period % MONTHLY_TIME);
} elseif (schedule == VestingSchedule.QUARTERLY) {
period = period - (period % QUARTERLY_TIME);
}
}
/**
* @dev Transfers vested tokens.
* @param _beneficiary Address of vested tokens beneficiary
* @param _transferTo Address to which tokens are transferred
*/function_release(address _beneficiary, address _transferTo) private{
uint256 unreleased = releasableAmount(_beneficiary);
require(unreleased >0, "SymbiosisTokenVesting: no tokens are due");
releasedToBeneficiary[_beneficiary] =
releasedToBeneficiary[_beneficiary] +
unreleased;
released = released + unreleased;
token.safeTransfer(_transferTo, unreleased);
emit TokensReleased(_beneficiary, _transferTo, unreleased);
}
}