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contracts/CollateralVault/impl/NFTCollateralVault.sol

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+/*
+
+    Copyright 2020 DODO ZOO.
+    SPDX-License-Identifier: Apache-2.0
+
+*/
+
+pragma solidity 0.6.9;
+
+import {SafeMath} from "../../lib/SafeMath.sol";
+import {InitializableOwnable} from "../../lib/InitializableOwnable.sol";
+import {IERC721} from "../../intf/IERC721.sol";
+import {IERC721Receiver} from "../../intf/IERC721Receiver.sol";
+
+contract NFTCollateralVault is InitializableOwnable, IERC721Receiver, ReentrancyGuard {
+    mapping(address => uint256[]) public _COLLECTIONS_;
+    address[] public _COLLECTION_ADDRESSES_;
+
+    function transferOwnership(address newOwner) external override onlyOwner {
+        emit OwnershipTransferred(_OWNER_, newOwner);
+        _OWNER_ = newOwner;
+    }
+}