Address Contract Partially Verified
Address
0x937a47D84F088f6C4917b5981efc1b13D042e96B
Balance
0.145810 ETH
Nonce
1
Code Size
23021 bytes
Creator
0xca707EFc...6E7B at tx 0xb4070876...020307
Indexed Transactions
0
Contract Bytecode
23021 bytes
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Verified Source Code Partial Match
Compiler: v0.6.0+commit.26b70077
EVM: istanbul
Optimization: No
OwnAssetBridge.sol 893 lines
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <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 GSN 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 payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
pragma solidity >=0.6.0 <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);
}
pragma solidity >=0.6.0 <0.8.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
contract ERC20 is Context, IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
* a default value of 18.
*
* To select a different value for {decimals}, use {_setupDecimals}.
*
* All three of these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name_, string memory symbol_) public {
_name = name_;
_symbol = symbol_;
_decimals = 18;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view 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 {_setupDecimals} is
* called.
*
* 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() public view returns (uint8) {
return _decimals;
}
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view override returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view 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) public virtual override returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public 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) public 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) public virtual override returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
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) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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) public virtual returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
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);
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(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 = _totalSupply.add(amount);
_balances[account] = _balances[account].add(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);
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(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 Sets {decimals} to a value other than the default one of 18.
*
* WARNING: This function should only be called from the constructor. Most
* applications that interact with token contracts will not expect
* {decimals} to ever change, and may work incorrectly if it does.
*/
function _setupDecimals(uint8 decimals_) internal {
_decimals = decimals_;
}
/**
* @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 { }
}
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
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.
*/
function renounceOwnership() public virtual onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
contract ERC20Mintable is ERC20, Ownable {
using SafeMath for uint;
constructor (string memory name_, string memory symbol_, uint totalSupply_)
ERC20(name_, symbol_)
public
{
_mint(_msgSender(), totalSupply_);
}
function mint(address to, uint256 amount)
public
onlyOwner
returns(bool)
{
_mint(to, amount);
return true;
}
}
/**
* @notice This contract is used to bridge WeOwn blockchain and any other blockchain running on EVM, primarily Ethereum.
* After establishing bridge between asset on WeOwn blockchain and ERC20 token, cross-chain transfers are enabled and
* users can move their holding between the blockchains.
*/
contract OwnAssetBridge is Ownable {
using SafeMath for uint;
enum RevertDirection{ FromNative, ToNative }
event CrossChainTransfer(address indexed token, string recipientAccountHash, uint amount);
event CrossChainTransfer(string txHash, address recipient);
mapping (string => address) public erc20Tokens;
mapping (address => string) public assetHashes;
mapping (string => string) public accountsForAssets;
mapping (string => address) public pendingCrossChainTransfers;
mapping (string => string) public pendingSignedTxs;
address public governor;
uint public targetTransferFee;
uint public nativeTransferFee;
uint public bridgeFee;
constructor(uint _bridgeFee, uint _targetTransferFee, uint _nativeTransferFee)
public
{
bridgeFee = _bridgeFee;
targetTransferFee = _targetTransferFee;
nativeTransferFee = _nativeTransferFee;
governor = _msgSender();
}
modifier onlyGovernor() {
require(_msgSender() == governor, "Caller is not the governor");
_;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// Bridge management
////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* @notice Function that establishes bridge between existing ERC20 token and newly created asset on WeOwn blockchain.
* This function can only be called by the governor and all tokens should be circulating on target blockchain, while
* total supply is locked on WeOwn blockchain.
*/
/// @param _token Address of ERC20 token
/// @param _assetHash Hash of WeOwn asset
/// @param _accountHash Hash of WeOwn account that will hold all locked tokens on WeOwn blockchain
function bridgeErc20Token(address _token, string calldata _assetHash, string calldata _accountHash)
external
onlyGovernor
payable
{
require(erc20Tokens[_assetHash] == address(0));
require(bytes(assetHashes[_token]).length == 0);
require(bytes(accountsForAssets[_assetHash]).length == 0);
require(IERC20(_token).balanceOf(address(this)) == 0);
require(msg.value >= bridgeFee);
erc20Tokens[_assetHash] = _token;
assetHashes[_token] = _assetHash;
accountsForAssets[_assetHash] = _accountHash;
}
/**
* @notice Function that deploys new ERC20 token and establishes bridge between existing asset on WeOwn blockchain
* and newly created ERC20 token. This function can only be called by the governor and all tokens should be
* circulating on WeOwn blockchain, while total supply is locked on target blockchain.
*/
/// @param _assetHash Hash of WeOwn asset
/// @param _accountHash Hash of WeOwn account that will hold all locked tokens on WeOwn blockchain
/// @param _assetName Name of ERC20 token that will be deployed. Needs to correspond to the name of WeOwn asset
/// @param _assetSymbol Symbol of ERC20 token that will be deployed. Needs to correspond to the symbol of WeOwn asset
/// @param _totalSupply Total supply of ERC20 token that will be deployed. Needs to correspond to the total supply of WeOwn asset
function bridgeAsset(
string calldata _assetHash,
string calldata _accountHash,
string calldata _assetName,
string calldata _assetSymbol,
uint _totalSupply)
external
onlyGovernor
payable
{
require(erc20Tokens[_assetHash] == address(0));
require(bytes(accountsForAssets[_assetHash]).length == 0);
require(msg.value >= bridgeFee);
address token = address(new ERC20Mintable(_assetName, _assetSymbol, _totalSupply));
erc20Tokens[_assetHash] = token;
assetHashes[token] = _assetHash;
accountsForAssets[_assetHash] = _accountHash;
}
/**
* @notice Function that removes bridge between ERC20 token and asset on WeOwn blockchain. This function can only
* be called by the governor and all tokens should be circulating on target blockchain or on WeOwn blockchain.
*/
/// @param _token Address of ERC20 token
function removeBridge(address _token)
external
onlyGovernor
{
string memory assetHash = assetHashes[_token];
require(bytes(assetHash).length != 0);
require(erc20Tokens[assetHash] == _token);
require(bytes(accountsForAssets[assetHash]).length != 0);
uint bridgeBalance = IERC20(_token).balanceOf(address(this));
require(bridgeBalance == 0 || bridgeBalance == IERC20(_token).totalSupply());
delete erc20Tokens[assetHash];
delete assetHashes[_token];
delete accountsForAssets[assetHash];
}
/**
* @notice Function that mints ERC20 token created by the bridge. This function can only
* be called by the governor in order to ensure consistency between WeOwn and target blockchains.
*/
/// @param _token Address of ERC20 token
/// @param _amount Amount of tokens that will be minted
function mintErc20Token(address _token, uint _amount)
external
onlyGovernor
{
require(ERC20Mintable(_token).mint(address(this), _amount));
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// Cross-chain transfers
////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* @notice Function by which token holder on target blockchain can transfer tokens to WeOwn blockchain.
* ERC20 token needs to be bridged to WeOwn asset and user should previously approve this contract as
* spender of desired amount of tokens that should be cross-chain transferred.
*/
/// @param _token Address of ERC20 token
/// @param _recipientAccountHash Hash of WeOwn account that should receive tokens
/// @param _amount Number of tokens that will be transferred
function transferToNativeChain(address _token, string calldata _recipientAccountHash, uint _amount)
external
payable
{
require(msg.value >= nativeTransferFee, "Insufficient fee is paid");
require(bytes(assetHashes[_token]).length != 0, "Token is not bridged");
require(IERC20(_token).transferFrom(_msgSender(), address(this), _amount), "Transfer failed");
emit CrossChainTransfer(_token, _recipientAccountHash, _amount);
}
/**
* @notice Function by which asset holder on WeOwn blockchain can transfer tokens to target blockchain.
* Asset needs to be bridged to ERC20 token and asset transfer should be done on WeOwn blockchain.
*/
/// @param _txHash Hash of tx on WeOwn blockchain which contains asset transfer
/// @param _signature Signature of tx hash, signed by WeOwn sender address
/// @param _recipient Address on target blockchain that should receive tokens
function transferFromNativeChain(string calldata _txHash, string calldata _signature, address _recipient)
external
payable
{
require(msg.value >= targetTransferFee, "Insufficient fee is paid");
require(pendingCrossChainTransfers[_txHash] == address(0), "Recipient is already determined");
require(bytes(pendingSignedTxs[_txHash]).length == 0, "Signature is already determined");
pendingCrossChainTransfers[_txHash] = _recipient;
pendingSignedTxs[_txHash] = _signature;
emit CrossChainTransfer(_txHash, _recipient);
}
/**
* @notice Function by which contract owner confirms cross-chain transfer from WeOwn blockchain. If the tx with
* asset transfer on WeOwn blockchain is valid and correctly signed, tokens will be released to address on target blockchain.
*/
/// @param _txHash Hash of tx on WeOwn blockchain which contains asset transfer
/// @param _token Address of ERC20 token
/// @param _amount Amount of tokens that will be released
function confirmTransfer(string calldata _txHash, IERC20 _token, uint _amount)
external
onlyOwner
{
address recipient = pendingCrossChainTransfers[_txHash];
require(recipient != address(0), "Recipient does not exist");
delete pendingCrossChainTransfers[_txHash];
delete pendingSignedTxs[_txHash];
require(_token.transfer(recipient, _amount), "Transfer failed");
}
/**
* @notice Function by which contract owner reverts cross-chain transfer from WeOwn blockchain.
*/
/// @param _txHash Hash of tx on WeOwn blockchain which contains asset transfer
function revertTransferFromNativeChain(string calldata _txHash)
external
onlyOwner
{
require(pendingCrossChainTransfers[_txHash] != address(0), "Tx does not exist");
delete pendingCrossChainTransfers[_txHash];
delete pendingSignedTxs[_txHash];
}
/**
* @notice Function by which contract owner reverts cross-chain transfer from target blockchain.
*/
/// @param _txHash Hash of tx on target blockchain that is reverted
/// @param _token Address of ERC20 token
/// @param _recipient Sender address to which tokens will be transferred back
/// @param _amount Amount of tokens that will be transferred back to sender address
function revertTransferToNativeChain(string calldata _txHash, IERC20 _token, address _recipient, uint _amount)
external
onlyOwner
{
require(_token.transfer(_recipient, _amount), "Transfer failed");
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// Owner administration
////////////////////////////////////////////////////////////////////////////////////////////////////
/**
* @notice Function by which contract owner sets governor address - address that can perform bridging and unbridging
* of ERC20 token and WeOwn asset.
*/
/// @param _governor New governor address
function setGovernor(address _governor)
external
onlyOwner
{
governor = _governor;
}
/**
* @notice Function by which contract owner sets fee that is paid for cross-chain transfer from WeOwn to target blockchain
*/
/// @param _amount New fee amount
function setTargetTransferFee(uint _amount)
external
onlyOwner
{
targetTransferFee = _amount;
}
/**
* @notice Function by which contract owner sets fee that is paid for cross-chain transfer from target to WeOwn blockchain
*/
/// @param _amount New fee amount
function setNativeTransferFee(uint _amount)
external
onlyOwner
{
nativeTransferFee = _amount;
}
/**
* @notice Function by which contract owner sets fee that is paid by governor when establishing bridge
*/
/// @param _amount New fee amount
function setBridgeFee(uint _amount)
external
onlyOwner
{
bridgeFee = _amount;
}
/**
* @notice Function by which contract owner withdraws fee collected through bridging and cross-chain transfers
*/
/// @param _amount Amount to be withdrawn
function withdrawFee(uint _amount)
external
onlyOwner
returns (bool)
{
payable(owner()).transfer(_amount);
return true;
}
}
Read Contract
accountsForAssets 0x2c050408 → string
assetHashes 0x1c837032 → string
bridgeFee 0x82b12dd7 → uint256
erc20Tokens 0x48d125f1 → address
governor 0x0c340a24 → address
nativeTransferFee 0x9641cae5 → uint256
owner 0x8da5cb5b → address
pendingCrossChainTransfers 0xa6641772 → address
pendingSignedTxs 0x1c6e4593 → string
targetTransferFee 0x907d1a54 → uint256
Write Contract 16 functions
These functions modify contract state and require a wallet transaction to execute.
bridgeAsset 0xd02ce3ae
string _assetHash
string _accountHash
string _assetName
string _assetSymbol
uint256 _totalSupply
bridgeErc20Token 0xc58d0b5b
address _token
string _assetHash
string _accountHash
confirmTransfer 0x33c55240
string _txHash
address _token
uint256 _amount
mintErc20Token 0x5329afb9
address _token
uint256 _amount
removeBridge 0x04df017d
address _token
renounceOwnership 0x715018a6
No parameters
revertTransferFromNativeChain 0xf2d3169c
string _txHash
revertTransferToNativeChain 0x9740a9e3
string _txHash
address _token
address _recipient
uint256 _amount
setBridgeFee 0x998cdf83
uint256 _amount
setGovernor 0xc42cf535
address _governor
setNativeTransferFee 0x8c785d56
uint256 _amount
setTargetTransferFee 0x95d71e94
uint256 _amount
transferFromNativeChain 0xe09e73a6
string _txHash
string _signature
address _recipient
transferOwnership 0xf2fde38b
address newOwner
transferToNativeChain 0x026a7710
address _token
string _recipientAccountHash
uint256 _amount
withdrawFee 0xbe357616
uint256 _amount
returns: bool
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