diff --git a/src/utils/WebAuthn.sol b/src/utils/WebAuthn.sol
index 3302bd98b..f14f260e3 100644
--- a/src/utils/WebAuthn.sol
+++ b/src/utils/WebAuthn.sol
@@ -21,16 +21,30 @@ library WebAuthn {
         // The WebAuthn client data JSON.
         // See: https://www.w3.org/TR/webauthn-2/#dom-authenticatorresponse-clientdatajson.
         string clientDataJSON;
-        // The index at which "challenge":"..." occurs in `clientDataJSON`.
+        // Start index of "challenge":"..." in `clientDataJSON`.
         uint256 challengeIndex;
-        // The index at which "type":"..." occurs in `clientDataJSON`.
+        // Start index of "type":"..." in `clientDataJSON`.
         uint256 typeIndex;
-        // The r value of secp256r1 signature
+        // The r value of secp256r1 signature.
         bytes32 r;
-        // The s value of secp256r1 signature
+        // The s value of secp256r1 signature.
         bytes32 s;
     }
 
+    /// @dev Alternative struct for verification (Ithaca style).
+    struct WebAuthnMetadata {
+        // The WebAuthn authenticator data.
+        bytes authenticatorData;
+        // The WebAuthn client data JSON.
+        string clientDataJSON;
+        // Start index of "challenge":"..." in `clientDataJSON`.
+        uint256 challengeIndex;
+        // Start index of "type":"..." in `clientDataJSON`.
+        uint256 typeIndex;
+        // Whether to check that the "User Verified" flag in `authenticatorData` is set.
+        bool requireUserVerification;
+    }
+
     /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
     /*                         CONSTANTS                          */
     /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
@@ -159,6 +173,31 @@ library WebAuthn {
         return result && P256.verifySignature(messageHash, auth.r, auth.s, x, y);
     }
 
+    /// @dev Alternative syntax for verification (Ithaca style).
+    function verify(
+        bytes memory challenge,
+        WebAuthnMetadata memory metadata,
+        bytes32 r,
+        bytes32 s,
+        bytes32 x,
+        bytes32 y
+    ) internal view returns (bool) {
+        return verify(
+            challenge,
+            metadata.requireUserVerification,
+            WebAuthnAuth(
+                metadata.authenticatorData,
+                metadata.clientDataJSON,
+                metadata.challengeIndex,
+                metadata.typeIndex,
+                r,
+                s
+            ),
+            x,
+            y
+        );
+    }
+
     /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
     /*                ENCODING / DECODING HELPERS                 */
     /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
diff --git a/test/WebAuthn.t.sol b/test/WebAuthn.t.sol
index 3d428c9fb..9506da63d 100644
--- a/test/WebAuthn.t.sol
+++ b/test/WebAuthn.t.sol
@@ -51,6 +51,27 @@ contract WebAuthnTest is P256VerifierEtcher {
         assertTrue(WebAuthn.verify(t.challenge, false, auth, t.x, t.y));
     }
 
+    function testSafariAltSyntax() public {
+        _etchRIPPrecompile(true);
+        _etchVerifier(true);
+        _TestTemps memory t = _testTemps();
+        WebAuthn.WebAuthnMetadata memory metadata;
+        metadata.authenticatorData =
+            hex"49960de5880e8c687434170f6476605b8fe4aeb9a28632c7995cf3ba831d97630500000101";
+        metadata.clientDataJSON = string(
+            abi.encodePacked(
+                '{"type":"webauthn.get","challenge":"',
+                Base64.encode(t.challenge, true, true),
+                '","origin":"http://localhost:3005"}'
+            )
+        );
+        metadata.challengeIndex = 23;
+        metadata.typeIndex = 1;
+        bytes32 r = 0x60946081650523acad13c8eff94996a409b1ed60e923c90f9e366aad619adffa;
+        bytes32 s = 0x3216a237b73765d01b839e0832d73474bc7e63f4c86ef05fbbbfbeb34b35602b;
+        assertTrue(WebAuthn.verify(t.challenge, metadata, r, s, t.x, t.y));
+    }
+
     function testChrome() public {
         _etchRIPPrecompile(true);
         _etchVerifier(true);
@@ -72,6 +93,27 @@ contract WebAuthnTest is P256VerifierEtcher {
         assertTrue(WebAuthn.verify(t.challenge, false, auth, t.x, t.y));
     }
 
+    function testChromeAltSyntax() public {
+        _etchRIPPrecompile(true);
+        _etchVerifier(true);
+        _TestTemps memory t = _testTemps();
+        WebAuthn.WebAuthnMetadata memory metadata;
+        metadata.authenticatorData =
+            hex"49960de5880e8c687434170f6476605b8fe4aeb9a28632c7995cf3ba831d9763050000010a";
+        metadata.clientDataJSON = string(
+            abi.encodePacked(
+                '{"type":"webauthn.get","challenge":"',
+                Base64.encode(t.challenge, true, true),
+                '","origin":"http://localhost:3005","crossOrigin":false}'
+            )
+        );
+        metadata.challengeIndex = 23;
+        metadata.typeIndex = 1;
+        bytes32 r = 0x41c01ca5ecdfeb23ef70d6cc216fd491ac3aa3d40c480751f3618a3a9ef67b41;
+        bytes32 s = 0x6595569abf76c2777e832a9252bae14efdb77febd0fa3b919aa16f6208469e86;
+        assertTrue(WebAuthn.verify(t.challenge, metadata, r, s, t.x, t.y));
+    }
+
     function testPassthroughDifferential(bytes32) public {
         _etchVerifierPassthrough(true);
         _etchRIPPrecompilePassthrough(true);