// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import './UpgradeabilityProxy.sol';
/**
 * @title AdminUpgradeabilityProxy
 * @dev This contract combines an upgradeability proxy with an authorization
 * mechanism for administrative tasks.
 * All external functions in this contract must be guarded by the
 * `ifAdmin` modifier. See ethereum/solidity#3864 for a Solidity
 * feature proposal that would enable this to be done automatically.
 */
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
  /**
   * Contract constructor.
   * @param _logic address of the initial implementation.
   * @param _admin Address of the proxy administrator.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, address _admin, bytes memory _data) UpgradeabilityProxy(_logic, _data) public payable {
    assert(ADMIN_SLOT == bytes32(uint256(keccak256('eip1967.proxy.admin')) - 1));
    _setAdmin(_admin);
  }
  /**
   * @dev Emitted when the administration has been transferred.
   * @param previousAdmin Address of the previous admin.
   * @param newAdmin Address of the new admin.
   */
  event AdminChanged(address previousAdmin, address newAdmin);
  /**
   * @dev Storage slot with the admin of the contract.
   * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
   * validated in the constructor.
   */
  bytes32 internal constant ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;
  /**
   * @dev Modifier to check whether the `msg.sender` is the admin.
   * If it is, it will run the function. Otherwise, it will delegate the call
   * to the implementation.
   */
  modifier ifAdmin() {
    if (msg.sender == _admin()) {
      _;
    } else {
      _fallback();
    }
  }
  /**
   * @return The address of the proxy admin.
   */
  function admin() external ifAdmin returns (address) {
    return _admin();
  }
  /**
   * @return The address of the implementation.
   */
  function implementation() external ifAdmin returns (address) {
    return _implementation();
  }
  /**
   * @dev Changes the admin of the proxy.
   * Only the current admin can call this function.
   * @param newAdmin Address to transfer proxy administration to.
   */
  function changeAdmin(address newAdmin) external ifAdmin {
    require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
    emit AdminChanged(_admin(), newAdmin);
    _setAdmin(newAdmin);
  }
  /**
   * @dev Upgrade the backing implementation of the proxy.
   * Only the admin can call this function.
   * @param newImplementation Address of the new implementation.
   */
  function upgradeTo(address newImplementation) external ifAdmin {
    _upgradeTo(newImplementation);
  }
  /**
   * @dev Upgrade the backing implementation of the proxy and call a function
   * on the new implementation.
   * This is useful to initialize the proxied contract.
   * @param newImplementation Address of the new implementation.
   * @param data Data to send as msg.data in the low level call.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   */
  function upgradeToAndCall(address newImplementation, bytes calldata data) payable external ifAdmin {
    _upgradeTo(newImplementation);
    (bool success,) = newImplementation.delegatecall(data);
    require(success);
  }
  /**
   * @return adm The admin slot.
   */
  function _admin() internal view returns (address adm) {
    bytes32 slot = ADMIN_SLOT;
    assembly {
      adm := sload(slot)
    }
  }
  /**
   * @dev Sets the address of the proxy admin.
   * @param newAdmin Address of the new proxy admin.
   */
  function _setAdmin(address newAdmin) internal {
    bytes32 slot = ADMIN_SLOT;
    assembly {
      sstore(slot, newAdmin)
    }
  }
  /**
   * @dev Only fall back when the sender is not the admin.
   */
  function _willFallback() internal override virtual {
    require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
    super._willFallback();
  }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
import './Proxy.sol';
import '@openzeppelin/contracts/utils/Address.sol';
/**
 * @title UpgradeabilityProxy
 * @dev This contract implements a proxy that allows to change the
 * implementation address to which it will delegate.
 * Such a change is called an implementation upgrade.
 */
contract UpgradeabilityProxy is Proxy {
  /**
   * @dev Contract constructor.
   * @param _logic Address of the initial implementation.
   * @param _data Data to send as msg.data to the implementation to initialize the proxied contract.
   * It should include the signature and the parameters of the function to be called, as described in
   * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding.
   * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped.
   */
  constructor(address _logic, bytes memory _data) public payable {
    assert(IMPLEMENTATION_SLOT == bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1));
    _setImplementation(_logic);
    if(_data.length > 0) {
      (bool success,) = _logic.delegatecall(_data);
      require(success);
    }
  }  
  /**
   * @dev Emitted when the implementation is upgraded.
   * @param implementation Address of the new implementation.
   */
  event Upgraded(address indexed implementation);
  /**
   * @dev Storage slot with the address of the current implementation.
   * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
   * validated in the constructor.
   */
  bytes32 internal constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
  /**
   * @dev Returns the current implementation.
   * @return impl Address of the current implementation
   */
  function _implementation() internal override view returns (address impl) {
    bytes32 slot = IMPLEMENTATION_SLOT;
    assembly {
      impl := sload(slot)
    }
  }
  /**
   * @dev Upgrades the proxy to a new implementation.
   * @param newImplementation Address of the new implementation.
   */
  function _upgradeTo(address newImplementation) internal {
    _setImplementation(newImplementation);
    emit Upgraded(newImplementation);
  }
  /**
   * @dev Sets the implementation address of the proxy.
   * @param newImplementation Address of the new implementation.
   */
  function _setImplementation(address newImplementation) internal {
    require(Address.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");
    bytes32 slot = IMPLEMENTATION_SLOT;
    assembly {
      sstore(slot, newImplementation)
    }
  }
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
 * @title Proxy
 * @dev Implements delegation of calls to other contracts, with proper
 * forwarding of return values and bubbling of failures.
 * It defines a fallback function that delegates all calls to the address
 * returned by the abstract _implementation() internal function.
 */
abstract contract Proxy {
  /**
   * @dev Fallback function.
   * Implemented entirely in `_fallback`.
   */
  fallback () payable external {
    _fallback();
  }
  /**
   * @dev Receive function.
   * Implemented entirely in `_fallback`.
   */
  receive () payable external {
    _fallback();
  }
  /**
   * @return The Address of the implementation.
   */
  function _implementation() internal virtual view returns (address);
  /**
   * @dev Delegates execution to an implementation contract.
   * This is a low level function that doesn't return to its internal call site.
   * It will return to the external caller whatever the implementation returns.
   * @param implementation Address to delegate.
   */
  function _delegate(address implementation) internal {
    assembly {
      // Copy msg.data. We take full control of memory in this inline assembly
      // block because it will not return to Solidity code. We overwrite the
      // Solidity scratch pad at memory position 0.
      calldatacopy(0, 0, calldatasize())
      // Call the implementation.
      // out and outsize are 0 because we don't know the size yet.
      let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)
      // Copy the returned data.
      returndatacopy(0, 0, returndatasize())
      switch result
      // delegatecall returns 0 on error.
      case 0 { revert(0, returndatasize()) }
      default { return(0, returndatasize()) }
    }
  }
  /**
   * @dev Function that is run as the first thing in the fallback function.
   * Can be redefined in derived contracts to add functionality.
   * Redefinitions must call super._willFallback().
   */
  function _willFallback() internal virtual {
  }
  /**
   * @dev fallback implementation.
   * Extracted to enable manual triggering.
   */
  function _fallback() internal {
    _willFallback();
    _delegate(_implementation());
  }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.2 <0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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
     * ====
     */
    function isContract(address account) internal view returns (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;
        // solhint-disable-next-line no-inline-assembly
        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].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      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._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        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._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        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._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory 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._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        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._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: openzeppelin-solidity/contracts/GSN/Context.sol

pragma solidity ^0.5.0;

/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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);
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.0;




/**
 * @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 {ERC20Mintable}.
 *
 * 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 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _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 {
        require(account != address(0), "ERC20: mint to the zero address");

        _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 {
        require(account != address(0), "ERC20: burn from the zero address");

        _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 is 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 {
        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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}

// File: openzeppelin-solidity/contracts/access/Roles.sol

pragma solidity ^0.5.0;

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

// File: openzeppelin-solidity/contracts/access/roles/MinterRole.sol

pragma solidity ^0.5.0;



contract MinterRole is Context {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor () internal {
        _addMinter(_msgSender());
    }

    modifier onlyMinter() {
        require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(_msgSender());
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol

pragma solidity ^0.5.0;



/**
 * @dev Extension of {ERC20} that adds a set of accounts with the {MinterRole},
 * which have permission to mint (create) new tokens as they see fit.
 *
 * At construction, the deployer of the contract is the only minter.
 */
contract ERC20Mintable is ERC20, MinterRole {
    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol

pragma solidity ^0.5.0;



/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev See {ERC20-_burnFrom}.
     */
    function burnFrom(address account, uint256 amount) public {
        _burnFrom(account, amount);
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.0;


/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @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.
     *
     * 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;
    }
}

// File: contracts/BridgeToken.sol

pragma solidity ^0.5.0;





/**
 * @title BridgeToken
 * @dev Mintable, ERC20Burnable, ERC20 compatible BankToken for use by BridgeBank
 **/

contract BridgeToken is ERC20Mintable, ERC20Burnable, ERC20Detailed {
    constructor()
        public
        ERC20Detailed("erowan", "erowan", 18)
    {
        // Intentionally left blank
    }
}

// File: contracts/ERC20DecimalsMock.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.5.16;



contract ERC20DecimalsMock is ERC20, ERC20Detailed {
    constructor (string memory name, string memory symbol, uint8 decimals) public ERC20Detailed(name, symbol, decimals) {}
}

// File: contracts/ERC20Mock.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.5.16;



// mock class using ERC20
contract ERC20Mock is ERC20Detailed, ERC20 {
    constructor (
        string memory name,
        string memory symbol,
        address initialAccount,
        uint256 initialBalance
    ) public payable ERC20Detailed(name, symbol, 18) {
        _mint(initialAccount, initialBalance);
    }

    function mint(address account, uint256 amount) public {
        _mint(account, amount);
    }

    function burn(address account, uint256 amount) public {
        _burn(account, amount);
    }

    function transferInternal(address from, address to, uint256 value) public {
        _transfer(from, to, value);
    }

    function approveInternal(address owner, address spender, uint256 value) public {
        _approve(owner, spender, value);
    }
}

// File: contracts/Migrations.sol

pragma solidity ^0.5.0;


contract Migrations {
    address public owner;
    // A function with the signature `last_completed_migration()`, returning a uint, is required.
    uint256 public last_completed_migration;

    modifier restricted() {
        if (msg.sender == owner) _;
    }

    constructor() public {
        owner = msg.sender;
    }

    // A function with the signature `setCompleted(uint)` is required.
    function setCompleted(uint256 completed) public restricted {
        last_completed_migration = completed;
    }

    function upgrade(address new_address) public restricted {
        Migrations upgraded = Migrations(new_address);
        upgraded.setCompleted(last_completed_migration);
    }
}

// File: contracts/one.sol

pragma solidity 0.5.16;
import "./CosmosBank.sol";
import "./EthereumBank.sol";
import "./EthereumWhitelist.sol";
import "./CosmosWhiteList.sol";
import "../Oracle.sol";
import "../CosmosBridge.sol";
import "./BankStorage.sol";
import "./Pausable.sol";
/*
 * @title BridgeBank
 * @dev Bank contract which coordinates asset-related functionality.
 *      CosmosBank manages the minting and burning of tokens which
 *      represent Cosmos based assets, while EthereumBank manages
 *      the locking and unlocking of Ethereum and ERC20 token assets
 *      based on Ethereum. WhiteList records the ERC20 token address 
 *      list that can be locked.
 **/
contract BridgeBank is BankStorage,
    CosmosBank,
    EthereumBank,
    EthereumWhiteList,
    CosmosWhiteList,
    Pausable {
    bool private _initialized;
    using SafeMath for uint256;
    /*
     * @dev: Initializer, sets operator
     */
    function initialize(
        address _operatorAddress,
        address _cosmosBridgeAddress,
        address _owner,
        address _pauser
    ) public {
        require(!_initialized, "Init");
        EthereumWhiteList.initialize();
        CosmosWhiteList.initialize();
        Pausable.initialize(_pauser);
        operator = _operatorAddress;
        cosmosBridge = _cosmosBridgeAddress;
        owner = _owner;
        _initialized = true;
        // hardcode since this is the first token
        lowerToUpperTokens["erowan"] = "erowan";
        lowerToUpperTokens["eth"] = "eth";
    }
    /*
     * @dev: Modifier to restrict access to operator
     */
    modifier onlyOperator() {
        require(msg.sender == operator, "!operator");
        _;
    }
    /*
     * @dev: Modifier to restrict access to operator
     */
    modifier onlyOwner() {
        require(msg.sender == owner, "!owner");
        _;
    }
    /*
     * @dev: Modifier to restrict access to the cosmos bridge
     */
    modifier onlyCosmosBridge() {
        require(
            msg.sender == cosmosBridge,
            "!cosmosbridge"
        );
        _;
    }
    /*
     * @dev: Modifier to only allow valid sif addresses
     */
    modifier validSifAddress(bytes memory _sifAddress) {
        require(_sifAddress.length == 42, "Invalid len");
        require(verifySifPrefix(_sifAddress) == true, "Invalid sif address");
        _;
    }
    function changeOwner(address _newOwner) public onlyOwner {
        require(_newOwner != address(0), "invalid address");
        owner = _newOwner;
    }
    function changeOperator(address _newOperator) public onlyOperator {
        require(_newOperator != address(0), "invalid address");
        operator = _newOperator;
    }
    /*
     * @dev: function to validate if a sif address has a correct prefix
     */
    function verifySifPrefix(bytes memory _sifAddress) public pure returns (bool) {
        bytes3 sifInHex = 0x736966;
        for (uint256 i = 0; i < sifInHex.length; i++) {
            if (sifInHex[i] != _sifAddress[i]) {
                return false;
            }
        }
        return true;
    }
    /*
     * @dev: Creates a new BridgeToken
     *
     * @param _symbol: The new BridgeToken's symbol
     * @return: The new BridgeToken contract's address
     */
    function createNewBridgeToken(string memory _symbol)
        public
        onlyCosmosBridge
        returns (address)
    {
        address newTokenAddress = deployNewBridgeToken(_symbol);
        setTokenInCosmosWhiteList(newTokenAddress, true);
        return newTokenAddress;
    }
    /*
     * @dev: Creates a new BridgeToken
     *
     * @param _symbol: The new BridgeToken's symbol
     * @return: The new BridgeToken contract's address
     */
    function addExistingBridgeToken(
        address _contractAddress
    ) public onlyOwner returns (address) {
        setTokenInCosmosWhiteList(_contractAddress, true);
        return useExistingBridgeToken(_contractAddress);
    }
    /*
     * @dev: Set the token address in whitelist
     *
     * @param _token: ERC 20's address
     * @param _inList: set the _token in list or not
     * @return: new value of if _token in whitelist
     */
    function updateEthWhiteList(address _token, bool _inList)
        public
        onlyOperator
        returns (bool)
    {
        string memory symbol = BridgeToken(_token).symbol();
        address listAddress = lockedTokenList[symbol];
        
        // Do not allow a token with the same symbol to be whitelisted
        if (_inList) {
            // if we want to add it to the whitelist, make sure that the address
            // is 0, meaning we have not seen that symbol in the whitelist before
            require(listAddress == address(0), "whitelisted");
        } else {
            // if we want to de-whitelist it, make sure that the symbol is 
            // in fact stored in our locked token list before we set to false
            require(uint256(listAddress) > 0, "!whitelisted");
        }
        lowerToUpperTokens[toLower(symbol)] = symbol;
        return setTokenInEthWhiteList(_token, _inList);
    }
    function bulkWhitelistUpdateLimits(address[] calldata tokenAddresses)
        external
        onlyOperator
        returns (bool)
    {
        for (uint256 i = 0; i < tokenAddresses.length; i++) {
            setTokenInEthWhiteList(tokenAddresses[i], true);
            string memory symbol = BridgeToken(tokenAddresses[i]).symbol();
            lowerToUpperTokens[toLower(symbol)] = symbol;
        }
        return true;
    }
    /*
     * @dev: Mints new BankTokens
     *
     * @param _cosmosSender: The sender's Cosmos address in bytes.
     * @param _ethereumRecipient: The intended recipient's Ethereum address.
     * @param _cosmosTokenAddress: The currency type
     * @param _symbol: comsos token symbol
     * @param _amount: number of comsos tokens to be minted
     */
    function mintBridgeTokens(
        address payable _intendedRecipient,
        string memory _symbol,
        uint256 _amount
    ) public onlyCosmosBridge whenNotPaused {
        string memory symbol = safeLowerToUpperTokens(_symbol);
        address tokenAddress = controlledBridgeTokens[symbol];
        return
            mintNewBridgeTokens(
                _intendedRecipient,
                tokenAddress,
                symbol,
                _amount
            );
    }
    /*
     * @dev: Burns BridgeTokens representing native Cosmos assets.
     *
     * @param _recipient: bytes representation of destination address.
     * @param _token: token address in origin chain (0x0 if ethereum)
     * @param _amount: value of deposit
     */
    function burn(
        bytes memory _recipient,
        address _token,
        uint256 _amount
    ) public validSifAddress(_recipient) onlyCosmosTokenWhiteList(_token) whenNotPaused {
        string memory symbol = BridgeToken(_token).symbol();
        BridgeToken(_token).burnFrom(msg.sender, _amount);
        burnFunds(msg.sender, _recipient, _token, symbol, _amount);
    }
    /*
     * @dev: Locks received Ethereum/ERC20 funds.
     *
     * @param _recipient: bytes representation of destination address.
     * @param _token: token address in origin chain (0x0 if ethereum)
     * @param _amount: value of deposit
     */
    function lock(
        bytes memory _recipient,
        address _token,
        uint256 _amount
    ) public payable onlyEthTokenWhiteList(_token) validSifAddress(_recipient) whenNotPaused {
        string memory symbol;
        // Ethereum deposit
        if (msg.value > 0) {
            require(
                _token == address(0),
                "!address(0)"
            );
            require(
                msg.value == _amount,
                "incorrect eth amount"
            );
            symbol = "eth";
            // ERC20 deposit
        } else {
            IERC20 tokenToTransfer = IERC20(_token);
            tokenToTransfer.safeTransferFrom(
                msg.sender,
                address(this),
                _amount
            );
            symbol = BridgeToken(_token).symbol();
        }
        lockFunds(msg.sender, _recipient, _token, symbol, _amount);
    }
    /*
     * @dev: Unlocks Ethereum and ERC20 tokens held on the contract.
     *
     * @param _recipient: recipient's Ethereum address
     * @param _token: token contract address
     * @param _symbol: token symbol
     * @param _amount: wei amount or ERC20 token count
     */
    function unlock(
        address payable _recipient,
        string memory _symbol,
        uint256 _amount
    ) public onlyCosmosBridge whenNotPaused {
        string memory symbol = safeLowerToUpperTokens(_symbol);
        // Confirm that the bank holds sufficient balances to complete the unlock
        address tokenAddress = lockedTokenList[symbol];
        unlockFunds(_recipient, tokenAddress, symbol, _amount);
    }
    /*
    * @dev fallback function for ERC223 tokens so that we can receive these tokens in our contract
    * Don't need to do anything to handle these tokens
    */
    function tokenFallback(address _from, uint _value, bytes memory _data) public {}
}
pragma solidity 0.5.16;
import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "./BridgeToken.sol";
import "./CosmosBankStorage.sol";
import "./ToLower.sol";
/**
 * @title CosmosBank
 * @dev Manages the deployment and minting of ERC20 compatible BridgeTokens
 *      which represent assets based on the Cosmos blockchain.
 **/
contract CosmosBank is CosmosBankStorage, ToLower {
    using SafeMath for uint256;
    /*
     * @dev: Event declarations
     */
    event LogNewBridgeToken(address _token, string _symbol);
    event LogBridgeTokenMint(
        address _token,
        string _symbol,
        uint256 _amount,
        address _beneficiary
    );
    /*
     * @dev: Get a token symbol's corresponding bridge token address.
     *
     * @param _symbol: The token's symbol/denom without 'e' prefix.
     * @return: Address associated with the given symbol. Returns address(0) if none is found.
     */
    function getBridgeToken(string memory _symbol)
        public
        view
        returns (address)
    {
        return (controlledBridgeTokens[_symbol]);
    }
    function safeLowerToUpperTokens(string memory _symbol)
        public
        view
        returns (string memory)
    {
        string memory retrievedSymbol = lowerToUpperTokens[_symbol];
        return keccak256(abi.encodePacked(retrievedSymbol)) == keccak256("") ? _symbol : retrievedSymbol;
    }
    /*
     * @dev: Deploys a new BridgeToken contract
     *
     * @param _symbol: The BridgeToken's symbol
     */
    function deployNewBridgeToken(string memory _symbol)
        internal
        returns (address)
    {
        bridgeTokenCount = bridgeTokenCount.add(1);
        // Deploy new bridge token contract
        BridgeToken newBridgeToken = (new BridgeToken)(_symbol);
        // Set address in tokens mapping
        address newBridgeTokenAddress = address(newBridgeToken);
        controlledBridgeTokens[_symbol] = newBridgeTokenAddress;
        lowerToUpperTokens[toLower(_symbol)] = _symbol;
        emit LogNewBridgeToken(newBridgeTokenAddress, _symbol);
        return newBridgeTokenAddress;
    }
    /*
     * @dev: Deploys a new BridgeToken contract
     *
     * @param _symbol: The BridgeToken's symbol
     *
     * @note the Rowan token symbol needs to be "Rowan" so that it integrates correctly with the cosmos bridge 
     */
    function useExistingBridgeToken(address _contractAddress)
        internal
        returns (address)
    {
        bridgeTokenCount = bridgeTokenCount.add(1);
        string memory _symbol = BridgeToken(_contractAddress).symbol();
        // Set address in tokens mapping
        address newBridgeTokenAddress = _contractAddress;
        controlledBridgeTokens[_symbol] = newBridgeTokenAddress;
        lowerToUpperTokens[toLower(_symbol)] = _symbol;
        emit LogNewBridgeToken(newBridgeTokenAddress, _symbol);
        return newBridgeTokenAddress;
    }
    /*
     * @dev: Mints new cosmos tokens
     *
     * @param _cosmosSender: The sender's Cosmos address in bytes.
     * @param _ethereumRecipient: The intended recipient's Ethereum address.
     * @param _cosmosTokenAddress: The currency type
     * @param _symbol: comsos token symbol
     * @param _amount: number of comsos tokens to be minted
     */
    function mintNewBridgeTokens(
        address payable _intendedRecipient,
        address _bridgeTokenAddress,
        string memory _symbol,
        uint256 _amount
    ) internal {
        require(
            controlledBridgeTokens[_symbol] == _bridgeTokenAddress,
            "Token must be a controlled bridge token"
        );
        // Mint bridge tokens
        require(
            BridgeToken(_bridgeTokenAddress).mint(_intendedRecipient, _amount),
            "Attempted mint of bridge tokens failed"
        );
        emit LogBridgeTokenMint(
            _bridgeTokenAddress,
            _symbol,
            _amount,
            _intendedRecipient
        );
    }
}
pragma solidity 0.5.16;
import "./BridgeToken.sol";
import "./EthereumBankStorage.sol";
import "openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
/*
 *  @title: EthereumBank
 *  @dev: Ethereum bank which locks Ethereum/ERC20 token deposits, and unlocks
 *        Ethereum/ERC20 tokens once the prophecy has been successfully processed.
 */
contract EthereumBank is EthereumBankStorage {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    /*
     * @dev: Event declarations
     */
    event LogBurn(
        address _from,
        bytes _to,
        address _token,
        string _symbol,
        uint256 _value,
        uint256 _nonce
    );
    event LogLock(
        address _from,
        bytes _to,
        address _token,
        string _symbol,
        uint256 _value,
        uint256 _nonce
    );
    event LogUnlock(
        address _to,
        address _token,
        string _symbol,
        uint256 _value
    );
    /*
     * @dev: Gets the contract address of locked tokens by symbol.
     *
     * @param _symbol: The asset's symbol.
     */
    function getLockedTokenAddress(string memory _symbol)
        public
        view
        returns (address)
    {
        return lockedTokenList[_symbol];
    }
    /*
     * @dev: Gets the amount of locked tokens by symbol.
     *
     * @param _symbol: The asset's symbol.
     */
    function getLockedFunds(string memory _symbol)
        public
        view
        returns (uint256)
    {
        return lockedFunds[lockedTokenList[_symbol]];
    }
    /*
     * @dev: Creates a new Ethereum deposit with a unique id.
     *
     * @param _sender: The sender's ethereum address.
     * @param _recipient: The intended recipient's cosmos address.
     * @param _token: The currency type, either erc20 or ethereum.
     * @param _amount: The amount of erc20 tokens/ ethereum (in wei) to be itemized.
     */
    function burnFunds(
        address payable _sender,
        bytes memory _recipient,
        address _token,
        string memory _symbol,
        uint256 _amount
    ) internal {
        lockBurnNonce = lockBurnNonce.add(1);
        emit LogBurn(_sender, _recipient, _token, _symbol, _amount, lockBurnNonce);
    }
    /*
     * @dev: Creates a new Ethereum deposit with a unique id.
     *
     * @param _sender: The sender's ethereum address.
     * @param _recipient: The intended recipient's cosmos address.
     * @param _token: The currency type, either erc20 or ethereum.
     * @param _amount: The amount of erc20 tokens/ ethereum (in wei) to be itemized.
     */
    function lockFunds(
        address payable _sender,
        bytes memory _recipient,
        address _token,
        string memory _symbol,
        uint256 _amount
    ) internal {
        lockBurnNonce = lockBurnNonce.add(1);
        // Increment locked funds by the amount of tokens to be locked
        lockedTokenList[_symbol] = _token;
        emit LogLock(_sender, _recipient, _token, _symbol, _amount, lockBurnNonce);
    }
    /*
     * @dev: Unlocks funds held on contract and sends them to the
     *       intended recipient
     *
     * @param _recipient: recipient's Ethereum address
     * @param _token: token contract address
     * @param _symbol: token symbol
     * @param _amount: wei amount or ERC20 token count
     */
    function unlockFunds(
        address payable _recipient,
        address _token,
        string memory _symbol,
        uint256 _amount
    ) internal {
        // Transfer funds to intended recipient
        if (_token == address(0)) {
            (bool success,) = _recipient.call.value(_amount).gas(60000)("");
            require(success, "error sending ether");
        } else {
            IERC20 tokenToTransfer = IERC20(_token);
            tokenToTransfer.safeTransfer(_recipient, _amount);
        }
        emit LogUnlock(_recipient, _token, _symbol, _amount);
    }
}
pragma solidity 0.5.16;
/**
 * @title WhiteList
 * @dev WhiteList contract records the ERC 20 list that can be locked in BridgeBank.
 **/
contract EthereumWhiteList {
    bool private _initialized;
    /**
    * @notice mapping to keep track of whitelisted tokens
    */
    mapping(address => bool) private _ethereumTokenWhiteList;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
    /*
     * @dev: Event declarations
     */
    event LogWhiteListUpdate(address _token, bool _value);
    function initialize() public {
        require(!_initialized, "Initialized");
        _ethereumTokenWhiteList[address(0)] = true;
        _initialized = true;
    }
    /*
     * @dev: Modifier to restrict erc20 can be locked
     */
    modifier onlyEthTokenWhiteList(address _token) {
        require(
            getTokenInEthWhiteList(_token),
            "Only token in whitelist can be transferred to cosmos"
        );
        _;
    }
    /*
     * @dev: Set the token address in whitelist
     *
     * @param _token: ERC 20's address
     * @param _inList: set the _token in list or not
     * @return: new value of if _token in whitelist
     */
    function setTokenInEthWhiteList(address _token, bool _inList)
        internal
        returns (bool)
    {
        _ethereumTokenWhiteList[_token] = _inList;
        emit LogWhiteListUpdate(_token, _inList);
        return _inList;
    }
    /*
     * @dev: Get if the token in whitelist
     *
     * @param _token: ERC 20's address
     * @return: if _token in whitelist
     */
    function getTokenInEthWhiteList(address _token) public view returns (bool) {
        return _ethereumTokenWhiteList[_token];
    }
}pragma solidity 0.5.16;
import "./CosmosWhiteListStorage.sol";
/**
 * @title WhiteList
 * @dev WhiteList contract records the ERC 20 list that can be locked in BridgeBank.
 **/
contract CosmosWhiteList is CosmosWhiteListStorage {
    bool private _initialized;
    /*
     * @dev: Event declarations
     */
    event LogWhiteListUpdate(address _token, bool _value);
    function initialize() public {
        require(!_initialized, "Initialized");
        _cosmosTokenWhiteList[address(0)] = true;
        _initialized = true;
    }
    /*
     * @dev: Modifier to restrict erc20 can be locked
     */
    modifier onlyCosmosTokenWhiteList(address _token) {
        require(
            getCosmosTokenInWhiteList(_token),
            "Only token in whitelist can be transferred to cosmos"
        );
        _;
    }
    /*
     * @dev: Set the token address in whitelist
     *
     * @param _token: ERC 20's address
     * @param _inList: set the _token in list or not
     * @return: new value of if _token in whitelist
     */
    function setTokenInCosmosWhiteList(address _token, bool _inList)
        internal
        returns (bool)
    {
        _cosmosTokenWhiteList[_token] = _inList;
        emit LogWhiteListUpdate(_token, _inList);
        return _inList;
    }
    /*
     * @dev: Get if the token in whitelist
     *
     * @param _token: ERC 20's address
     * @return: if _token in whitelist
     */
    function getCosmosTokenInWhiteList(address _token) public view returns (bool) {
        return _cosmosTokenWhiteList[_token];
    }
}pragma solidity 0.5.16;
import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "./Valset.sol";
import "./OracleStorage.sol";
import "./Valset.sol";
contract Oracle is OracleStorage, Valset {
    using SafeMath for uint256;
    bool private _initialized;
    /*
     * @dev: Event declarations
     */
    event LogNewOracleClaim(
        uint256 _prophecyID,
        address _validatorAddress
    );
    event LogProphecyProcessed(
        uint256 _prophecyID,
        uint256 _prophecyPowerCurrent,
        uint256 _prophecyPowerThreshold,
        address _submitter
    );
    /*
     * @dev: Modifier to restrict access to the operator.
     */
    modifier onlyOperator() {
        require(msg.sender == operator, "Must be the operator.");
        _;
    }
    /*
     * @dev: Initialize Function
     */
    function _initialize(
        address _operator,
        uint256 _consensusThreshold,
        address[] memory _initValidators,
        uint256[] memory _initPowers
    ) internal {
        require(!_initialized, "Initialized");
        require(
            _consensusThreshold > 0,
            "Consensus threshold must be positive."
        );
        require(
            _consensusThreshold <= 100,
            "Invalid consensus threshold."
        );
        operator = _operator;
        consensusThreshold = _consensusThreshold;
        _initialized = true;
        Valset._initialize(_operator, _initValidators, _initPowers);
    }
    /*
     * @dev: newOracleClaim
     *       Allows validators to make new OracleClaims on an existing Prophecy
     */
    function newOracleClaim(
        uint256 _prophecyID,
        address validatorAddress
    ) internal
        returns (bool)
    {
        // Confirm that this address has not already made an oracle claim on this prophecy
        require(
            !hasMadeClaim[_prophecyID][validatorAddress],
            "Cannot make duplicate oracle claims from the same address."
        );
        hasMadeClaim[_prophecyID][validatorAddress] = true;
        // oracleClaimValidators[_prophecyID].push(validatorAddress);
        oracleClaimValidators[_prophecyID] = oracleClaimValidators[_prophecyID].add(
            getValidatorPower(validatorAddress)
        );
        emit LogNewOracleClaim(
            _prophecyID,
            validatorAddress
        );
        // Process the prophecy
        (bool valid, , ) = getProphecyThreshold(_prophecyID);
        return valid;
    }
    /*
     * @dev: processProphecy
     *       Calculates the status of a prophecy. The claim is considered valid if the
     *       combined active signatory validator powers pass the consensus threshold.
     *       The threshold is x% of Total power, where x is the consensusThreshold param.
     */
    function getProphecyThreshold(uint256 _prophecyID)
        public
        view
        returns (bool, uint256, uint256)
    {
        uint256 signedPower = 0;
        uint256 totalPower = totalPower;
        signedPower = oracleClaimValidators[_prophecyID];
        // Prophecy must reach total signed power % threshold in order to pass consensus
        uint256 prophecyPowerThreshold = totalPower.mul(consensusThreshold);
        // consensusThreshold is a decimal multiplied by 100, so signedPower must also be multiplied by 100
        uint256 prophecyPowerCurrent = signedPower.mul(100);
        bool hasReachedThreshold = prophecyPowerCurrent >=
            prophecyPowerThreshold;
        return (
            hasReachedThreshold,
            prophecyPowerCurrent,
            prophecyPowerThreshold
        );
    }
}
pragma solidity 0.5.16;
import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "./Valset.sol";
import "./Oracle.sol";
import "./BridgeBank/BridgeBank.sol";
import "./CosmosBridgeStorage.sol";
contract CosmosBridge is CosmosBridgeStorage, Oracle {
    using SafeMath for uint256;
    
    bool private _initialized;
    uint256[100] private ___gap;
    /*
     * @dev: Event declarations
     */
    event LogOracleSet(address _oracle);
    event LogBridgeBankSet(address _bridgeBank);
    event LogNewProphecyClaim(
        uint256 _prophecyID,
        ClaimType _claimType,
        address payable _ethereumReceiver,
        string _symbol,
        uint256 _amount
    );
    event LogProphecyCompleted(uint256 _prophecyID, ClaimType _claimType);
    /*
     * @dev: Modifier to restrict access to the operator.
     */
    modifier onlyOperator() {
        require(msg.sender == operator, "Must be the operator.");
        _;
    }
    /*
     * @dev: Modifier to restrict access to current ValSet validators
     */
    modifier onlyValidator() {
        require(
            isActiveValidator(msg.sender),
            "Must be an active validator"
        );
        _;
    }
    /*
     * @dev: Constructor
     */
    function initialize(
        address _operator,
        uint256 _consensusThreshold,
        address[] memory _initValidators,
        uint256[] memory _initPowers
    ) public {
        require(!_initialized, "Initialized");
        COSMOS_NATIVE_ASSET_PREFIX = "e";
        operator = _operator;
        hasBridgeBank = false;
        _initialized = true;
        Oracle._initialize(
            _operator,
            _consensusThreshold,
            _initValidators,
            _initPowers
        );
    }
    function changeOperator(address _newOperator) public onlyOperator {
        require(_newOperator != address(0), "invalid address");
        operator = _newOperator;
    }
    /*
     * @dev: setBridgeBank
     */
    function setBridgeBank(address payable _bridgeBank) public onlyOperator {
        require(
            !hasBridgeBank,
            "The Bridge Bank cannot be updated once it has been set"
        );
        hasBridgeBank = true;
        bridgeBank = _bridgeBank;
        emit LogBridgeBankSet(bridgeBank);
    }
    function getProphecyID(
        ClaimType _claimType,
        bytes calldata _cosmosSender,
        uint256 _cosmosSenderSequence,
        address payable _ethereumReceiver,
        string calldata _symbol,
        uint256 _amount
    ) external pure returns (uint256) {
        return uint256(keccak256(abi.encodePacked(_claimType, _cosmosSender, _cosmosSenderSequence, _ethereumReceiver, _symbol, _amount)));
    }
    /*
     * @dev: newProphecyClaim
     *       Creates a new burn or lock prophecy claim, adding it to the prophecyClaims mapping.
     *       Burn claims require that there are enough locked Ethereum assets to complete the prophecy.
     *       Lock claims have a new token contract deployed or use an existing contract based on symbol.
     */
    function newProphecyClaim(
        ClaimType _claimType,
        bytes memory _cosmosSender,
        uint256 _cosmosSenderSequence,
        address payable _ethereumReceiver,
        string memory _symbol,
        uint256 _amount
    ) public onlyValidator {
        uint256 _prophecyID = uint256(keccak256(abi.encodePacked(_claimType, _cosmosSender, _cosmosSenderSequence, _ethereumReceiver, _symbol, _amount)));
        (bool prophecyCompleted, , ) = getProphecyThreshold(_prophecyID);
        require(!prophecyCompleted, "prophecyCompleted");
        if (oracleClaimValidators[_prophecyID] == 0) {
            string memory symbol = BridgeBank(bridgeBank).safeLowerToUpperTokens(_symbol);
            if (_claimType == ClaimType.Burn) {
                address tokenAddress = BridgeBank(bridgeBank).getLockedTokenAddress(symbol);
                if (tokenAddress == address(0) && uint256(keccak256(abi.encodePacked(symbol))) != uint256(keccak256("eth"))) {
                    revert("Invalid token address");
                }
            } else if (_claimType == ClaimType.Lock) {
                address bridgeTokenAddress = BridgeBank(bridgeBank).getBridgeToken(symbol);
                if (bridgeTokenAddress == address(0)) {
                    // First lock of this asset, deploy new contract and get new symbol/token address
                    BridgeBank(bridgeBank).createNewBridgeToken(symbol);
                }
            } else {
                revert("Invalid claim type, only burn and lock are supported.");
            }
            emit LogNewProphecyClaim(
                _prophecyID,
                _claimType,
                _ethereumReceiver,
                symbol,
                _amount
            );
        }
        bool claimComplete = newOracleClaim(_prophecyID, msg.sender);
        if (claimComplete) {
            completeProphecyClaim(
                _prophecyID,
                _claimType,
                _ethereumReceiver,
                _symbol,
                _amount
            );
        }
    }
    /*
     * @dev: completeProphecyClaim
     *       Allows for the completion of ProphecyClaims once processed by the Oracle.
     *       Burn claims unlock tokens stored by BridgeBank.
     *       Lock claims mint BridgeTokens on BridgeBank's token whitelist.
     */
    function completeProphecyClaim(
        uint256 _prophecyID,
        ClaimType claimType,
        address payable ethereumReceiver,
        string memory symbol,
        uint256 amount
    ) internal {
        if (claimType == ClaimType.Burn) {
            unlockTokens(ethereumReceiver, symbol, amount);
        } else {
            issueBridgeTokens(ethereumReceiver, symbol, amount);
        }
        emit LogProphecyCompleted(_prophecyID, claimType);
    }
    /*
     * @dev: issueBridgeTokens
     *       Issues a request for the BridgeBank to mint new BridgeTokens
     */
    function issueBridgeTokens(
        address payable ethereumReceiver,
        string memory symbol,
        uint256 amount
    ) internal {
        BridgeBank(bridgeBank).mintBridgeTokens(
            ethereumReceiver,
            symbol,
            amount
        );
    }
    /*
     * @dev: unlockTokens
     *       Issues a request for the BridgeBank to unlock funds held on contract
     */
    function unlockTokens(
        address payable ethereumReceiver,
        string memory symbol,
        uint256 amount
    ) internal {
        BridgeBank(bridgeBank).unlock(
            ethereumReceiver,
            symbol,
            amount
        );
    }
}
pragma solidity 0.5.16;
import "./CosmosBankStorage.sol";
import "./EthereumBankStorage.sol";
import "./CosmosWhiteListStorage.sol";
contract BankStorage is 
    CosmosBankStorage,
    EthereumBankStorage,
    CosmosWhiteListStorage {
    /**
    * @notice operator address that can update the smart contract
    */
    address public operator;
    /**
    * @notice address of the Oracle smart contract
    */
    address public oracle;
    /**
    * @notice address of the Cosmos Bridge smart contract
    */
    address public cosmosBridge;
    /**
    * @notice owner address that can use the admin API
    */
    address public owner;
    mapping (string => uint256) public maxTokenAmount;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity 0.5.16;
import "./PauserRole.sol";
/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is PauserRole {
    /**
     * @dev Emitted when the pause is triggered by a pauser (`account`).
     */
    event Paused(address account);
    /**
     * @dev Emitted when the pause is lifted by a pauser (`account`).
     */
    event Unpaused(address account);
    bool private _paused;
    function initialize (address _user) internal {
        _addPauser(_user);
        _paused = false;
    }
    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }
    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }
    /**
     * @dev Called by a owner to toggle pause
     */
    function togglePause() private {
        _paused = !_paused;
    }
    /**
     * @dev Called by a pauser to pause contract
     */
    function pause() external onlyPauser whenNotPaused {
        togglePause();
        emit Paused(msg.sender);
    }
    /**
     * @dev Called by a pauser to unpause contract
     */
    function unpause() external onlyPauser whenPaused {
        togglePause();
        emit Unpaused(msg.sender);
    }
}
pragma solidity ^0.5.0;
/**
 * @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.
     *
     * _Available since v2.4.0._
     */
    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.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        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.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}
pragma solidity 0.5.16;
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol";
import "openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol";
/**
 * @title BridgeToken
 * @dev Mintable, ERC20Burnable, ERC20 compatible BankToken for use by BridgeBank
 **/
contract BridgeToken is ERC20Mintable, ERC20Burnable, ERC20Detailed {
    constructor(string memory _symbol)
        public
        ERC20Detailed(_symbol, _symbol, 18)
    {
        // Intentionally left blank
    }
}
pragma solidity 0.5.16;
contract CosmosBankStorage {
    /**
    * @notice Cosmos deposit struct
    */
    struct CosmosDeposit {
        bytes cosmosSender;
        address payable ethereumRecipient;
        address bridgeTokenAddress;
        uint256 amount;
        bool locked;
    }
    /**
    * @notice number of bridge tokens
    */
    uint256 public bridgeTokenCount;
    /**
    * @notice cosmos deposit nonce
    */
    uint256 public cosmosDepositNonce;
    
    /**
    * @notice mapping of symbols to token addresses
    */
    mapping(string => address) controlledBridgeTokens;
    
    /**
    * @notice mapping of lowercase symbols to properly capitalized tokens
    */
    mapping(string => string) public lowerToUpperTokens;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity 0.5.16;
contract ToLower {
    function toLower(string memory str) public pure returns (string memory) {
\t\tbytes memory bStr = bytes(str);
\t\tbytes memory bLower = new bytes(bStr.length);
\t\tfor (uint i = 0; i < bStr.length; i++) {
\t\t\t// Uppercase character...
\t\t\tif ((bStr[i] >= bytes1(uint8(65))) && (bStr[i] <= bytes1(uint8(90)))) {
\t\t\t\t// So we add 32 to make it lowercase
\t\t\t\tbLower[i] = bytes1(uint8(bStr[i]) + 32);
\t\t\t} else {
\t\t\t\tbLower[i] = bStr[i];
\t\t\t}
\t\t}
\t\treturn string(bLower);
\t}
}pragma solidity ^0.5.0;
import "./ERC20.sol";
import "../../access/roles/MinterRole.sol";
/**
 * @dev Extension of {ERC20} that adds a set of accounts with the {MinterRole},
 * which have permission to mint (create) new tokens as they see fit.
 *
 * At construction, the deployer of the contract is the only minter.
 */
contract ERC20Mintable is ERC20, MinterRole {
    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }
}
pragma solidity ^0.5.0;
import "../../GSN/Context.sol";
import "./ERC20.sol";
/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public {
        _burn(_msgSender(), amount);
    }
    /**
     * @dev See {ERC20-_burnFrom}.
     */
    function burnFrom(address account, uint256 amount) public {
        _burnFrom(account, amount);
    }
}
pragma solidity ^0.5.0;
import "./IERC20.sol";
/**
 * @dev Optional functions from the ERC20 standard.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }
    /**
     * @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.
     *
     * 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;
    }
}
pragma solidity ^0.5.0;
import "../../GSN/Context.sol";
import "./IERC20.sol";
import "../../math/SafeMath.sol";
/**
 * @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 {ERC20Mintable}.
 *
 * 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 {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    uint256 private _totalSupply;
    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }
    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view 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 returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }
    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }
    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public 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 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 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 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 {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        _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 {
        require(account != address(0), "ERC20: mint to the zero address");
        _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 {
        require(account != address(0), "ERC20: burn from the zero address");
        _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 is 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 {
        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 Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }
}
pragma solidity ^0.5.0;
import "../../GSN/Context.sol";
import "../Roles.sol";
contract MinterRole is Context {
    using Roles for Roles.Role;
    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);
    Roles.Role private _minters;
    constructor () internal {
        _addMinter(_msgSender());
    }
    modifier onlyMinter() {
        require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role");
        _;
    }
    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }
    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }
    function renounceMinter() public {
        _removeMinter(_msgSender());
    }
    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }
    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
}
pragma solidity ^0.5.0;
/*
 * @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.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks
    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }
    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}
pragma solidity ^0.5.0;
/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
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 ^0.5.0;
/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }
    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }
    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }
    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}
pragma solidity 0.5.16;
contract EthereumBankStorage {
    /**
    * @notice current lock and or burn nonce
    */
    uint256 public lockBurnNonce;
    /**
    * @notice how much funds we have stored of a certain token
    */
    mapping(address => uint256) public lockedFunds;
    /**
    * @notice map the token symbol to the token address
    */
    mapping(string => address) public lockedTokenList;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity ^0.5.0;
import "./IERC20.sol";
import "../../math/SafeMath.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 ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }
    function safeApprove(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'
        // solhint-disable-next-line max-line-length
        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));
    }
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        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, bytes memory 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.
        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
pragma solidity ^0.5.5;
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }
    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }
    /**
     * @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].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}
pragma solidity 0.5.16;
contract CosmosWhiteListStorage {
    /**
    * @notice mapping to keep track of whitelisted tokens
    */
    mapping(address => bool) internal _cosmosTokenWhiteList;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity 0.5.16;
import "openzeppelin-solidity/contracts/math/SafeMath.sol";
import "./ValsetStorage.sol";
contract Valset is ValsetStorage {
    using SafeMath for uint256;
    bool private _initialized;
    /*
     * @dev: Event declarations
     */
    event LogValidatorAdded(
        address _validator,
        uint256 _power,
        uint256 _currentValsetVersion,
        uint256 _validatorCount,
        uint256 _totalPower
    );
    event LogValidatorPowerUpdated(
        address _validator,
        uint256 _power,
        uint256 _currentValsetVersion,
        uint256 _validatorCount,
        uint256 _totalPower
    );
    event LogValidatorRemoved(
        address _validator,
        uint256 _power,
        uint256 _currentValsetVersion,
        uint256 _validatorCount,
        uint256 _totalPower
    );
    event LogValsetReset(
        uint256 _newValsetVersion,
        uint256 _validatorCount,
        uint256 _totalPower
    );
    event LogValsetUpdated(
        uint256 _newValsetVersion,
        uint256 _validatorCount,
        uint256 _totalPower
    );
    /*
     * @dev: Modifier which restricts access to the operator.
     */
    modifier onlyOperator() {
        require(msg.sender == operator, "Must be the operator.");
        _;
    }
    /*
     * @dev: Constructor
     */
    function _initialize(
        address _operator,
        address[] memory _initValidators,
        uint256[] memory _initPowers
    ) internal {
        require(!_initialized, "Initialized");
        operator = _operator;
        currentValsetVersion = 0;
        _initialized = true;
        require(
            _initValidators.length == _initPowers.length,
            "Every validator must have a corresponding power"
        );
        resetValset();
        for (uint256 i = 0; i < _initValidators.length; i++) {
            addValidatorInternal(_initValidators[i], _initPowers[i]);
        }
        emit LogValsetUpdated(currentValsetVersion, validatorCount, totalPower);
    }
    /*
     * @dev: addValidator
     */
    function addValidator(address _validatorAddress, uint256 _validatorPower)
        public
        onlyOperator
    {
        addValidatorInternal(_validatorAddress, _validatorPower);
    }
    /*
     * @dev: updateValidatorPower
     */
    function updateValidatorPower(
        address _validatorAddress,
        uint256 _newValidatorPower
    ) public onlyOperator {
        require(
            validators[_validatorAddress][currentValsetVersion],
            "Can only update the power of active valdiators"
        );
        // Adjust total power by new validator power
        uint256 priorPower = powers[_validatorAddress][currentValsetVersion];
        totalPower = totalPower.sub(priorPower);
        totalPower = totalPower.add(_newValidatorPower);
        // Set validator's new power
        powers[_validatorAddress][currentValsetVersion] = _newValidatorPower;
        emit LogValidatorPowerUpdated(
            _validatorAddress,
            _newValidatorPower,
            currentValsetVersion,
            validatorCount,
            totalPower
        );
    }
    /*
     * @dev: removeValidator
     */
    function removeValidator(address _validatorAddress) public onlyOperator {
        require(validators[_validatorAddress][currentValsetVersion], "Can only remove active validators");
        // Update validator count and total power
        validatorCount = validatorCount.sub(1);
        totalPower = totalPower.sub(powers[_validatorAddress][currentValsetVersion]);
        // Delete validator and power
        delete validators[_validatorAddress][currentValsetVersion];
        delete powers[_validatorAddress][currentValsetVersion];
        emit LogValidatorRemoved(
            _validatorAddress,
            0,
            currentValsetVersion,
            validatorCount,
            totalPower
        );
    }
    /*
     * @dev: updateValset
     */
    function updateValset(
        address[] memory _validators,
        uint256[] memory _powers
    ) public onlyOperator {
        require(
            _validators.length == _powers.length,
            "Every validator must have a corresponding power"
        );
        resetValset();
        for (uint256 i = 0; i < _validators.length; i++) {
            addValidatorInternal(_validators[i], _powers[i]);
        }
        emit LogValsetUpdated(currentValsetVersion, validatorCount, totalPower);
    }
    /*
     * @dev: isActiveValidator
     */
    function isActiveValidator(address _validatorAddress)
        public
        view
        returns (bool)
    {
        // Return bool indicating if this address is an active validator
        return validators[_validatorAddress][currentValsetVersion];
    }
    /*
     * @dev: getValidatorPower
     */
    function getValidatorPower(address _validatorAddress)
        public
        view
        returns (uint256)
    {
        return powers[_validatorAddress][currentValsetVersion];
    }
    /*
     * @dev: recoverGas
     */
    function recoverGas(uint256 _valsetVersion, address _validatorAddress)
        external
        onlyOperator
    {
        require(
            _valsetVersion < currentValsetVersion,
            "Gas recovery only allowed for previous validator sets"
        );
        // Delete from mappings and recover gas
        delete (validators[_validatorAddress][currentValsetVersion]);
        delete (powers[_validatorAddress][currentValsetVersion]);
    }
    /*
     * @dev: addValidatorInternal
     */
    function addValidatorInternal(
        address _validatorAddress,
        uint256 _validatorPower
    ) internal {
        validatorCount = validatorCount.add(1);
        totalPower = totalPower.add(_validatorPower);
        // Set validator as active and set their power
        validators[_validatorAddress][currentValsetVersion] = true;
        powers[_validatorAddress][currentValsetVersion] = _validatorPower;
        emit LogValidatorAdded(
            _validatorAddress,
            _validatorPower,
            currentValsetVersion,
            validatorCount,
            totalPower
        );
    }
    /*
     * @dev: resetValset
     */
    function resetValset() internal {
        currentValsetVersion = currentValsetVersion.add(1);
        validatorCount = 0;
        totalPower = 0;
        emit LogValsetReset(currentValsetVersion, validatorCount, totalPower);
    }
}
pragma solidity 0.5.16;
contract OracleStorage {
    /*
     * @dev: Public variable declarations
     */
    address public cosmosBridge;
    /**
    * @notice Tracks the number of OracleClaims made on an individual BridgeClaim
    */
    address public operator;
    /**
    * @notice Tracks the number of OracleClaims made on an individual BridgeClaim
    */
    uint256 public consensusThreshold; // e.g. 75 = 75%
    /**
    * @notice Tracks the number of OracleClaims made on an individual BridgeClaim
    */
    mapping(uint256 => uint256) public oracleClaimValidators;
    /**
    * @notice mapping of prophecyid to validator address to boolean
    */
    mapping(uint256 => mapping(address => bool)) public hasMadeClaim;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity 0.5.16;
contract ValsetStorage {
    /**
     * @dev: Total power of all validators
     */
    uint256 public totalPower;
    /**
     * @dev: Current valset version
     */
    uint256 public currentValsetVersion;
    /**
     * @dev: validator count
     */
    uint256 public validatorCount;
    /**
     * @dev: Keep track of active validator
     */
    mapping(address => mapping(uint256 => bool)) public validators;
    /**
     * @dev: operator address
     */
    address public operator;
    /**
     * @dev: validator address + uint then hashed equals key mapped to powers
     */
    mapping(address => mapping(uint256 => uint256)) public powers;
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity 0.5.16;
import "./BridgeBank/CosmosBankStorage.sol";
import "./BridgeBank/EthereumBankStorage.sol";
contract CosmosBridgeStorage {
    /**
    * @notice gap of storage for future upgrades
    */
    string COSMOS_NATIVE_ASSET_PREFIX;
    /*
     * @dev: Public variable declarations
     */
    address public operator;
    
    /**
    * @notice gap of storage for future upgrades
    */
    address payable public valset;
    
    /**
    * @notice gap of storage for future upgrades
    */
    address payable public oracle;
    
    /**
    * @notice gap of storage for future upgrades
    */
    address payable public bridgeBank;
    
    /**
    * @notice gap of storage for future upgrades
    */
    bool public hasBridgeBank;
    /**
    * @notice gap of storage for future upgrades
    */
    mapping(uint256 => ProphecyClaim) public prophecyClaims;
    /**
    * @notice prophecy status enum
    */
    enum Status {Null, Pending, Success, Failed}
    /**
    * @notice claim type enum
    */
    enum ClaimType {Unsupported, Burn, Lock}
    /**
    * @notice Prophecy claim struct
    */
    struct ProphecyClaim {
        address payable ethereumReceiver;
        string symbol;
        uint256 amount;
    }
    /**
    * @notice gap of storage for future upgrades
    */
    uint256[100] private ____gap;
}pragma solidity 0.5.16;
contract PauserRole {
    mapping (address => bool) public pausers;
    modifier onlyPauser() {
        require(pausers[msg.sender], "PauserRole: caller does not have the Pauser role");
        _;
    }
    function addPauser(address account) public onlyPauser {
        _addPauser(account);
    }
    function renouncePauser() public {
        _removePauser(msg.sender);
    }
    function _addPauser(address account) internal {
        pausers[account] = true;
    }
    function _removePauser(address account) internal {
        pausers[account] = false;
    }
}