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373/**
374 * @notice Revert burnSyntheticToken() operation
375 * @dev Can called only by bridge after initiation on a second chain
376 * @dev Further, this transaction also enters the relay network and is called on the other side under the method "revertBurn"
377 * @param _txID the synthesize transaction that was received from the event when it was originally called burn on the Synthesize contract
378 * @param _receiveSide Synthesis address on another network
379 * @param _oppositeBridge Bridge address on another network
380 * @param _chainId Chain id of the network
381 */
382function revertBurnRequest(
383    uint256 _stableBridgingFee,
384    bytes32 _txID,
385    address _receiveSide,
386    address _oppositeBridge,
387    uint256 _chainId
388) external payable whenNotPaused {
389    bytes32 externalID = keccak256(abi.encodePacked(_txID, address(this), block.chainid));
390
391    require(
392        unsynthesizeStates[externalID] != UnsynthesizeState.Unsynthesized,
393        "Symb: Real tokens already transfered"
394    );
395    unsynthesizeStates[externalID] = UnsynthesizeState.RevertRequest;
396
397    {
398        bytes memory out = abi.encodeWithSelector(
399            bytes4(keccak256(bytes("revertBurn(uint256,bytes32)"))),
400            _stableBridgingFee,
401            externalID
402        );
403        IBridge(bridge).transmitRequestV2(
404            out,
405            _receiveSide,
406            _oppositeBridge,
407            _chainId
408        );
409    }
410
411    emit RevertBurnRequest(_txID, _msgSender());
412}

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585receive() external payable {}

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444/**
445 * @notice Sets MetaRouter address
446 */
447function setMetaRouter(IMetaRouterV2 _metaRouter) external onlyOwner {
448    require(address(_metaRouter) != address(0), "Symb: metaRouter cannot be zero address");
449    metaRouter = _metaRouter;
450}