Extract abi part to compare and update IERC6538

.github/workflows/ci.yml

@@ -46,13 +46,14 @@ jobs:
 
       - name: Ensure correctness of the `IERC5564Announcer` interface
         run: |
-          diff=$(jd -set out/ERC5564Announcer.sol/ERC5564Announcer.json out/IERC5564Announcer.sol/IERC5564Announcer.json)
+          diff=$(jd -set <(jq '.abi' out/ERC5564Announcer.sol/ERC5564Announcer.json) <(jq '.abi' out/IERC5564Announcer.sol/IERC5564Announcer.json))
           if [[ -n $diff ]]; then exit 1; fi
 
       - name: Ensure correctness of the `IERC6538Registry` interface
         run: |
-          diff=$(jd -set out/ERC6538Registry.sol/ERC6538Registry.json out/IERC6538Registry.sol/IERC6538Registry.json)
-          if [[ -n $diff ]]; then exit 1; fi
+          diff=$(jd -set <(jq '.abi' out/ERC6538Registry.sol/ERC6538Registry.json) <(jq '.abi' out/IERC6538Registry.sol/IERC6538Registry.json))
+          expected_diff="@ [[\"set\"],{}] - {\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"}"
+          if [[ $diff != $expected_diff ]]; then exit 1; fi
 
   coverage:
     runs-on: ubuntu-latest

src/ERC6538Registry.sol

@@ -13,9 +13,9 @@ contract ERC6538Registry {
   mapping(address registrant => mapping(uint256 schemeId => bytes)) public stealthMetaAddressOf;
 
   /// @notice A nonce used to ensure a signature can only be used once.
-  /// @dev `user` is the registrant address.
+  /// @dev `registrant` is the user address.
   /// @dev `nonce` will be incremented after each valid `registerKeysOnBehalf` call.
-  mapping(address user => uint256) public nonceOf;
+  mapping(address registrant => uint256) public nonceOf;
 
   /// @notice The EIP-712 type hash used in `registerKeysOnBehalf`.
   bytes32 public constant ERC6538REGISTRY_ENTRY_TYPE_HASH =

src/interfaces/IERC6538Registry.sol

@@ -4,6 +4,9 @@ pragma solidity 0.8.23;
 /// @dev Interface for calling the `ERC6538Registry` contract to map accounts to their stealth
 /// meta-address. See [ERC-6538](https://eips.ethereum.org/EIPS/eip-6538) to learn more.
 interface IERC6538Registry {
+  /// @notice Emitted when an invalid signature is provided to `registerKeysOnBehalf`.
+  error ERC6538Registry__InvalidSignature();
+
   /// @dev Emitted when a registrant updates their stealth meta-address.
   /// @param registrant The account that registered the stealth meta-address.
   /// @param schemeId Identifier corresponding to the applied stealth address scheme, e.g. 0 for
@@ -45,4 +48,16 @@ interface IERC6538Registry {
 
   /// @notice Returns the domain separator used in this contract.
   function DOMAIN_SEPARATOR() external view returns (bytes32);
+
+  /// @notice Returns the stealth meta-address for the given `registrant` and `schemeId`.
+  function stealthMetaAddressOf(address registrant, uint256 schemeId)
+    external
+    view
+    returns (bytes memory);
+
+  /// @notice Returns the EIP-712 type hash used in `registerKeysOnBehalf`.
+  function ERC6538REGISTRY_ENTRY_TYPE_HASH() external view returns (bytes32);
+
+  /// @notice Returns the nonce of the given `registrant`.
+  function nonceOf(address registrant) external view returns (uint256);
 }