diff --git a/.gas-snapshot b/.gas-snapshot
index 3d2fd21..205d831 100644
--- a/.gas-snapshot
+++ b/.gas-snapshot
@@ -10,15 +10,16 @@ AddOwnerPublicKeyTest:testRevertsIfAlreadyOwner() (gas: 116339)
 AddOwnerPublicKeyTest:testRevertsIfCalledByNonOwner() (gas: 11754)
 AddOwnerPublicKeyTest:testSetsIsOwner() (gas: 113794)
 AddOwnerPublicKeyTest:testSetsOwnerAtIndex() (gas: 128562)
-CoinbaseSmartWallet1271InputGeneratorTest:testGetReplaySafeHashForDeployedAccount() (gas: 308658)
-CoinbaseSmartWallet1271InputGeneratorTest:testGetReplaySafeHashForUndeployedAccount() (gas: 291429)
+CoinbaseSmartWallet1271InputGeneratorTest:testGetReplaySafeHashForDeployedAccount() (gas: 308670)
+CoinbaseSmartWallet1271InputGeneratorTest:testGetReplaySafeHashForUndeployedAccount() (gas: 291699)
 CoinbaseSmartWalletFactoryTest:testDeployDeterministicPassValues() (gas: 267742)
 CoinbaseSmartWalletFactoryTest:test_CreateAccount_ReturnsPredeterminedAddress_WhenAccountAlreadyExists() (gas: 287406)
 CoinbaseSmartWalletFactoryTest:test_createAccountDeploysToPredeterminedAddress() (gas: 269093)
 CoinbaseSmartWalletFactoryTest:test_createAccountSetsOwnersCorrectly() (gas: 277981)
 CoinbaseSmartWalletFactoryTest:test_implementation_returnsExpectedAddress() (gas: 7676)
 CoinbaseSmartWalletFactoryTest:test_revertsIfNoOwners() (gas: 29214)
-ERC1271Test:test_returnsExpectedDomainHashWhenProxy() (gas: 15406)
+ERC1271Test:test_returnsExpectedDomainHashWhenProxy() (gas: 15384)
+ERC1271Test:test_static() (gas: 3057560)
 MultiOwnableInitializeTest:testRevertsIfLength32ButLargerThanAddress() (gas: 78927)
 MultiOwnableInitializeTest:testRevertsIfLength32NotAddress() (gas: 78908)
 MultiOwnableInitializeTest:testRevertsIfLengthNot32Or64() (gas: 101211)
diff --git a/src/utils/ERC1271InputGenerator.sol b/src/utils/ERC1271InputGenerator.sol
index ebc45ca..4c71fdd 100644
--- a/src/utils/ERC1271InputGenerator.sol
+++ b/src/utils/ERC1271InputGenerator.sol
@@ -13,6 +13,16 @@ import {CoinbaseSmartWallet} from "../CoinbaseSmartWallet.sol";
 ///
 /// @author Coinbase (https://github.com/coinbase/smart-wallet)
 contract ERC1271InputGenerator {
+    /// @notice Thrown when call to `accountFactory` with `factoryCalldata` fails.
+    error AccountDeploymentFailed();
+
+    /// @notice Thrown when the address returned from call to `accountFactory` does not
+    /// match passed account
+    ///
+    /// @param account The passed account
+    /// @param returned The returned account
+    error ReturnedAddressDoesNotMatchAccount(address account, address returned);
+
     /// @notice Computes and returns the expected ERC-1271 replay-safe hash for a CoinbaseSmartWallet.
     ///
     /// @dev `accountFactory` can be any address if the account is already deployed.
@@ -60,8 +70,15 @@ contract ERC1271InputGenerator {
         }
 
         // Deploy the account.
-        (bool success,) = accountFactory.call(factoryCalldata);
-        require(success, "CoinbaseSmartWallet1271InputGenerator: deployment");
+        (bool success, bytes memory result) = accountFactory.call(factoryCalldata);
+        if (!success) {
+            revert AccountDeploymentFailed();
+        }
+
+        address returnAddress = abi.decode(result, (address));
+        if (returnAddress != address(account)) {
+            revert ReturnedAddressDoesNotMatchAccount(address(account), returnAddress);
+        }
 
         // Call and return replaySafeHash on the now-deployed account.
         return account.replaySafeHash(hash);
diff --git a/test/ERC1271.t.sol b/test/ERC1271.t.sol
index f57716a..e457eaf 100644
--- a/test/ERC1271.t.sol
+++ b/test/ERC1271.t.sol
@@ -6,6 +6,8 @@ import {Test, console2} from "forge-std/Test.sol";
 import "../src/ERC1271.sol";
 import "../src/CoinbaseSmartWalletFactory.sol";
 
+import {MockCoinbaseSmartWallet} from "./mocks/MockCoinbaseSmartWallet.sol";
+
 contract ERC1271Test is Test {
     CoinbaseSmartWalletFactory factory;
     CoinbaseSmartWallet account;
@@ -33,4 +35,21 @@ contract ERC1271Test is Test {
         );
         assertEq(expected, account.domainSeparator());
     }
+
+    /// @dev a test for a static output, for reference with a javascript test out of this repo
+    function test_static() public {
+        vm.chainId(84532);
+
+        owners.push(
+            hex"66efa90a7c6a9fe2f4472dc80307116577be940f06f4b81b3cce9207d0d35ebdd420af05337a40c253b6a37144c30ba22bbd54c71af9e4457774d790b34c8227"
+        );
+        CoinbaseSmartWallet a = new MockCoinbaseSmartWallet();
+        vm.etch(0x2Af621c1B01466256393EBA6BF183Ac2962fd98C, address(a).code);
+        a.initialize(owners);
+        bytes32 expected = 0x1b03b7e3bddbb2f9b5080f154cf33fcbed9b9cd42c98409fb0730369426a0a69;
+        bytes32 actual = CoinbaseSmartWallet(payable(0x2Af621c1B01466256393EBA6BF183Ac2962fd98C)).replaySafeHash(
+            0x9ef3f7124243b092c883252302a74d4ed968efc9f612396f1a82bbeef8931328
+        );
+        assertEq(expected, actual);
+    }
 }