diff --git a/modules/passkey/contracts/SafeWebAuthnSignerProxy.sol b/modules/passkey/contracts/SafeWebAuthnSignerProxy.sol
index 545d260c..104451b8 100644
--- a/modules/passkey/contracts/SafeWebAuthnSignerProxy.sol
+++ b/modules/passkey/contracts/SafeWebAuthnSignerProxy.sol
@@ -11,15 +11,15 @@ contract SafeWebAuthnSignerProxy {
     /**
      * @notice The X coordinate of the P-256 public key of the WebAuthn credential.
      */
-    uint256 public immutable X;
+    uint256 internal immutable X;
     /**
      * @notice The Y coordinate of the P-256 public key of the WebAuthn credential.
      */
-    uint256 public immutable Y;
+    uint256 internal immutable Y;
     /**
      * @notice The P-256 verifiers used for ECDSA signature validation.
      */
-    P256.Verifiers public immutable VERIFIERS;
+    P256.Verifiers internal immutable VERIFIERS;
 
     /**
      * @notice The contract address to which proxy contract forwards the call via delegatecall.
diff --git a/modules/passkey/contracts/SafeWebAuthnSignerSingleton.sol b/modules/passkey/contracts/SafeWebAuthnSignerSingleton.sol
index db009968..b7ac2332 100644
--- a/modules/passkey/contracts/SafeWebAuthnSignerSingleton.sol
+++ b/modules/passkey/contracts/SafeWebAuthnSignerSingleton.sol
@@ -24,4 +24,25 @@ contract SafeWebAuthnSignerSingleton is SignatureValidator {
         }
         success = WebAuthn.verifySignature(message, signature, WebAuthn.USER_VERIFICATION, x, y, verifiers);
     }
+
+    function getX() external view returns (uint256 x) {
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            x := calldataload(sub(calldatasize(), 88))
+        }
+    }
+
+    function getY() external view returns (uint256 y) {
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            y := calldataload(sub(calldatasize(), 56))
+        }
+    }
+
+    function getVerifiers() external view returns (P256.Verifiers verifiers) {
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            verifiers := shr(64, calldataload(sub(calldatasize(), 24)))
+        }
+    }
 }
diff --git a/modules/passkey/contracts/base/SignatureValidator.sol b/modules/passkey/contracts/base/SignatureValidator.sol
index ad0baa2f..800282b2 100644
--- a/modules/passkey/contracts/base/SignatureValidator.sol
+++ b/modules/passkey/contracts/base/SignatureValidator.sol
@@ -2,7 +2,6 @@
 pragma solidity >=0.8.0;
 
 import {ERC1271} from "../libraries/ERC1271.sol";
-import {P256} from "../libraries/WebAuthn.sol";
 
 /**
  * @title Signature Validator Base Contract
diff --git a/modules/passkey/test/SafeWebAuthnSignerProxy.spec.ts b/modules/passkey/test/SafeWebAuthnSignerProxy.spec.ts
index 09157bbb..4698b410 100644
--- a/modules/passkey/test/SafeWebAuthnSignerProxy.spec.ts
+++ b/modules/passkey/test/SafeWebAuthnSignerProxy.spec.ts
@@ -52,12 +52,9 @@ describe('SafeWebAuthnSignerProxy', () => {
   describe('constructor', function () {
     it('Should set immutables', async () => {
       const { x, y, verifiers, signer } = await setupTests()
-
-      const signerProxy = await ethers.getContractAt('SafeWebAuthnSignerProxy', signer.target)
-      expect(await signerProxy.X()).to.equal(x)
-      expect(await signerProxy.Y()).to.equal(y)
-
-      expect(await signerProxy.VERIFIERS()).to.equal(verifiers)
+      expect(await signer.getX()).to.equal(x)
+      expect(await signer.getY()).to.equal(y)
+      expect(await signer.getVerifiers()).to.equal(verifiers)
     })
   })