diff --git a/contracts/RolesRegistry/SftRolesRegistrySingleRole.sol b/contracts/RolesRegistry/SftRolesRegistrySingleRole.sol
index 280b16d..4a72024 100644
--- a/contracts/RolesRegistry/SftRolesRegistrySingleRole.sol
+++ b/contracts/RolesRegistry/SftRolesRegistrySingleRole.sol
@@ -2,7 +2,7 @@
 
 pragma solidity 0.8.9;
 
-import { IERCXXXX } from './interfaces/IERCXXXX.sol';
+import { ISftRolesRegistry } from './interfaces/ISftRolesRegistry.sol';
 import { IERC165 } from '@openzeppelin/contracts/utils/introspection/IERC165.sol';
 import { IERC1155 } from '@openzeppelin/contracts/token/ERC1155/IERC1155.sol';
 import { IERC1155Receiver } from '@openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol';
@@ -10,7 +10,7 @@ import { ERC1155Holder, ERC1155Receiver } from '@openzeppelin/contracts/token/ER
 import { ERC165Checker } from '@openzeppelin/contracts/utils/introspection/ERC165Checker.sol';
 
 // Semi-fungible token (SFT) registry with only one role (UNIQUE_ROLE)
-contract SftRolesRegistrySingleRole is IERCXXXX, ERC1155Holder {
+contract SftRolesRegistrySingleRole is ISftRolesRegistry, ERC1155Holder {
     bytes32 public constant UNIQUE_ROLE = keccak256('UNIQUE_ROLE');
 
     // grantor => tokenAddress => operator => isApproved
@@ -216,7 +216,7 @@ contract SftRolesRegistrySingleRole is IERCXXXX, ERC1155Holder {
     function supportsInterface(
         bytes4 interfaceId
     ) public view virtual override(ERC1155Receiver, IERC165) returns (bool) {
-        return interfaceId == type(IERCXXXX).interfaceId || interfaceId == type(IERC1155Receiver).interfaceId;
+        return interfaceId == type(ISftRolesRegistry).interfaceId || interfaceId == type(IERC1155Receiver).interfaceId;
     }
 
     /** Helper Functions **/
diff --git a/contracts/RolesRegistry/interfaces/ISftRolesRegistry.sol b/contracts/RolesRegistry/interfaces/ISftRolesRegistry.sol
new file mode 100644
index 0000000..4e8c84a
--- /dev/null
+++ b/contracts/RolesRegistry/interfaces/ISftRolesRegistry.sol
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: CC0-1.0
+
+pragma solidity 0.8.9;
+
+import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
+
+/// @title ERC-XXXX Semi-Fungible Token Roles
+/// @dev See https://eips.ethereum.org/EIPS/eip-XXXX
+/// Note: the ERC-165 identifier for this interface is 0xTBD
+interface ISftRolesRegistry is IERC165 {
+    struct RoleData {
+        address grantee;
+        uint64 expirationDate;
+        bool revocable;
+        bytes data;
+    }
+
+    struct DepositInfo {
+        address grantor;
+        address tokenAddress;
+        uint256 tokenId;
+        uint256 tokenAmount;
+    }
+
+    struct RoleAssignment {
+        uint256 nonce;
+        bytes32 role;
+        address tokenAddress;
+        uint256 tokenId;
+        uint256 tokenAmount;
+        address grantor;
+        address grantee;
+        uint64 expirationDate;
+        bool revocable;
+        bytes data;
+    }
+
+    /** Events **/
+
+    /// @notice Emitted when a role is granted.
+    /// @param _nonce The identifier of the role assignment.
+    /// @param _role The role identifier.
+    /// @param _tokenAddress The token address.
+    /// @param _tokenId The token identifier.
+    /// @param _tokenAmount The token amount.
+    /// @param _grantor The user assigning the role.
+    /// @param _grantee The user receiving the role.
+    /// @param _expirationDate The expiration date of the role.
+    /// @param _revocable Whether the role is revocable or not.
+    /// @param _data Any additional data about the role.
+    event RoleGranted(
+        uint256 indexed _nonce,
+        bytes32 indexed _role,
+        address _tokenAddress,
+        uint256 _tokenId,
+        uint256 _tokenAmount,
+        address _grantor,
+        address _grantee,
+        uint64 _expirationDate,
+        bool _revocable,
+        bytes _data
+    );
+
+    /// @notice Emitted when a role is revoked.
+    /// @param _nonce The identifier of the role assignment.
+    /// @param _role The role identifier.
+    /// @param _tokenAddress The token address.
+    /// @param _tokenId The token identifier.
+    /// @param _tokenAmount The token amount.
+    /// @param _revoker The user revoking the role.
+    /// @param _grantee The user that receives the role revocation.
+    event RoleRevoked(
+        uint256 indexed _nonce,
+        bytes32 indexed _role,
+        address _tokenAddress,
+        uint256 _tokenId,
+        uint256 _tokenAmount,
+        address _revoker,
+        address _grantee
+    );
+
+    /// @notice Emitted when a user is approved to manage roles on behalf of another user.
+    /// @param _tokenAddress The token address.
+    /// @param _operator The user approved to grant and revoke roles.
+    /// @param _isApproved The approval status.
+    event RoleApprovalForAll(address indexed _tokenAddress, address indexed _operator, bool _isApproved);
+
+    /// @notice Emitted when a user withdraws tokens from a role assignment.
+    /// @param _nonce The identifier of the role assignment.
+    /// @param _grantor The user withdrawing the tokens.
+    /// @param _tokenAddress The token address.
+    /// @param _tokenId The token identifier.
+    /// @param _tokenAmount The token amount withdrawn.
+    event Withdrew(uint256 indexed _nonce, address indexed _grantor, address _tokenAddress, uint256 _tokenId, uint256 _tokenAmount);
+
+    /** External Functions **/
+
+    /// @notice Grants a role on behalf of a user.
+    /// @param _roleAssignment The role assignment data.
+    function grantRoleFrom(RoleAssignment calldata _roleAssignment) external;
+
+    /// @notice Revokes a role on behalf of a user.
+    /// @param _nonce The identifier of the role assignment.
+    /// @param _role The role identifier.
+    /// @param _grantee The user that gets their role revoked.
+    function revokeRoleFrom(uint256 _nonce, bytes32 _role, address _grantee) external;
+
+    /// @notice Approves operator to grant and revoke any roles on behalf of another user.
+    /// @param _tokenAddress The token address.
+    /// @param _operator The user approved to grant and revoke roles.
+    /// @param _approved The approval status.
+    function setRoleApprovalForAll(address _tokenAddress, address _operator, bool _approved) external;
+
+    /** View Functions **/
+
+    /// @notice Returns the custom data of a role assignment.
+    /// @param _nonce The identifier of the role assignment.
+    /// @param _role The role identifier.
+    /// @param _grantee The user that gets their role revoked.
+    function roleData(uint256 _nonce, bytes32 _role, address _grantee) external view returns (RoleData memory data_);
+
+    /// @notice Returns the expiration date of a role assignment.
+    /// @param _nonce The identifier of the role assignment.
+    /// @param _role The role identifier.
+    /// @param _grantee The user that gets their role revoked.
+    function roleExpirationDate(uint256 _nonce, bytes32 _role, address _grantee) external view returns (uint64 expirationDate_);
+
+    /// @notice Checks if the grantor approved the operator for all NFTs.
+    /// @param _tokenAddress The token address.
+    /// @param _grantor The user that approved the operator.
+    /// @param _operator The user that can grant and revoke roles.
+    function isRoleApprovedForAll(address _tokenAddress, address _grantor, address _operator) external view returns (bool);
+}