diff --git a/src/hub/Hub.sol b/src/hub/Hub.sol
index 9cced90..4f0e1df 100644
--- a/src/hub/Hub.sol
+++ b/src/hub/Hub.sol
@@ -1,9 +1,9 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 pragma solidity >=0.8.13;
 
-import "openzeppelin-contracts/contracts/token/ERC1155/utils/ERC1155Holder.sol";
-import "openzeppelin-contracts/contracts/token/ERC20/ERC20.sol";
-import "openzeppelin-contracts/contracts/utils/Create2.sol";
+import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+import "@openzeppelin/contracts/utils/Create2.sol";
 import "../migration/IHub.sol";
 import "../migration/IToken.sol";
 import "../circles/Circles.sol";
diff --git a/src/treasury/standardTreasury.sol b/src/treasury/standardTreasury.sol
index 5dab59b..60dc22a 100644
--- a/src/treasury/standardTreasury.sol
+++ b/src/treasury/standardTreasury.sol
@@ -2,14 +2,33 @@
 pragma solidity >=0.8.13;
 
 import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Holder.sol";
+import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
+import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
 import "../proxy/ProxyFactory.sol";
+import "../hub/MetadataDefinitions.sol";
+
+contract standardTreasury is ERC165, IERC1155Receiver, ProxyFactory {
+    // Constants
+
+    /**
+     * @dev The call prefix for the setup function on the vault contract
+     */
+    bytes4 public constant STANDARD_VAULT_SETUP_CALLPREFIX = bytes4(keccak256("setup(address)"));
 
-contract standardTreasury is ERC1155Holder, ProxyFactory {
     // State variables
 
     address public immutable hub;
 
-    // modifier
+    /**
+     * @notice Mapping of group address to vault address
+     * @dev The vault is the contract that holds the group's collateral
+     * todo: we could use deterministic vault addresses as to not store them
+     * but then we still need to check whether the correct code has been deployed
+     * so we might as well deploy and store the addresses?
+     */
+    mapping(address => address) public vaults;
+
+    // Modifiers
 
     modifier onlyHub() {
         require(msg.sender == hub, "Treasury: caller is not the hub");
@@ -23,23 +42,41 @@ contract standardTreasury is ERC1155Holder, ProxyFactory {
         hub = _hub;
     }
 
-    function onERC1155Received(address, address, uint256, uint256, bytes memory)
-        public
-        virtual
-        override
-        onlyHub
-        returns (bytes4)
-    {
+    // Public functions
+
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
+        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
+    }
+
+    function onERC1155Received(
+        address, /*_operator*/
+        address, /*_from*/
+        uint256, /*_id*/
+        uint256, /*_value*/
+        bytes memory /*_data*/
+    ) public virtual override onlyHub returns (bytes4) {
         return this.onERC1155Received.selector;
     }
 
-    function onERC1155BatchReceived(address, address, uint256[] memory, uint256[] memory, bytes memory)
-        public
-        virtual
-        override
-        onlyHub
-        returns (bytes4)
-    {
+    function onERC1155BatchReceived(
+        address _operator,
+        address _from,
+        uint256[] memory _ids,
+        uint256[] memory _values,
+        bytes memory _data
+    ) public virtual override onlyHub returns (bytes4) {
+        MetadataDefinitions.Metadata memory metadata = abi.decode(_data, (MetadataDefinitions.Metadata));
+        require(metadata.metadataType == MetadataDefinitions.MetadataType.GroupMint, "Treasury: Invalid metadata type");
+        MetadataDefinitions.GroupMintMetadata memory groupMintMetadata =
+            abi.decode(metadata.metadata, (MetadataDefinitions.GroupMintMetadata));
+
         return this.onERC1155BatchReceived.selector;
     }
+
+    // Internal functions
+
+    function _getVault(address _group) internal returns (address) {}
 }
diff --git a/src/treasury/standardVault.sol b/src/treasury/standardVault.sol
index 8b13789..779e09a 100644
--- a/src/treasury/standardVault.sol
+++ b/src/treasury/standardVault.sol
@@ -1 +1,54 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity >=0.8.13;
 
+import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
+import "@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol";
+
+contract standardVault is ERC165, IERC1155Receiver {
+    // State variables
+
+    address public standardTreasury;
+
+    // Constructor
+
+    constructor() {
+        standardTreasury = address(1);
+    }
+
+    // External functions
+
+    function setup(address _standardTreasury) external {
+        require(standardTreasury == address(0), "Vault contract has already been setup.");
+        require(_standardTreasury != address(0), "Treasury address must not be zero address");
+        standardTreasury = _standardTreasury;
+    }
+
+    // Public functions
+
+    /**
+     * @dev See {IERC165-supportsInterface}.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
+        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
+    }
+
+    function onERC1155Received(
+        address, /*_operator*/
+        address, /*_from*/
+        uint256, /*_id*/
+        uint256, /*_value*/
+        bytes memory /*_data*/
+    ) public virtual override returns (bytes4) {
+        return this.onERC1155Received.selector;
+    }
+
+    function onERC1155BatchReceived(
+        address, /*_operator*/
+        address, /*_from*/
+        uint256[] memory, /*_ids*/
+        uint256[] memory, /*_values*/
+        bytes memory /*_data*/
+    ) public virtual override returns (bytes4) {
+        return this.onERC1155BatchReceived.selector;
+    }
+}