diff --git a/.gas-snapshot b/.gas-snapshot
new file mode 100644
index 0000000..0316ac9
--- /dev/null
+++ b/.gas-snapshot
@@ -0,0 +1 @@
+SnapshotTest:test_snapshot((address,uint256,bytes,bytes,uint256,uint256,uint256,uint256,uint256,bytes,bytes)) (runs: 256, μ: 409655, ~: 410110)
\ No newline at end of file
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
new file mode 100644
index 0000000..8f7fbf5
--- /dev/null
+++ b/.github/workflows/test.yaml
@@ -0,0 +1,15 @@
+name: test
+on:
+  push:
+    branches: [main]
+  pull_request:
+  workflow_dispatch:
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - uses: foundry-rs/foundry-toolchain@v1
+      - run: for i in {1..16}; do forge snapshot --force | grep test_snapshot; done
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0473c65
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,13 @@
+# foundry
+cache/
+out/
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+/broadcast/**/run-latest.json
+docs/
+
+.env
+.vscode/
+.DS_Store
+*.log
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6a86d3e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib/webauthn-sol"]
+	path = lib/webauthn-sol
+	url = https://github.com/base-org/webauthn-sol
diff --git a/foundry.toml b/foundry.toml
new file mode 100644
index 0000000..c08d9cf
--- /dev/null
+++ b/foundry.toml
@@ -0,0 +1,8 @@
+[profile.default]
+isolate = true
+
+[fmt]
+tab_width = 2
+sort_imports = true
+bracket_spacing = true
+number_underscore = "thousands"
diff --git a/lib/webauthn-sol b/lib/webauthn-sol
new file mode 160000
index 0000000..619f20a
--- /dev/null
+++ b/lib/webauthn-sol
@@ -0,0 +1 @@
+Subproject commit 619f20ab0f074fef41066ee4ab24849a913263b2
diff --git a/test/Snapshot.t.sol b/test/Snapshot.t.sol
new file mode 100644
index 0000000..37aab54
--- /dev/null
+++ b/test/Snapshot.t.sol
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: AGPL-3.0
+pragma solidity ^0.8.0;
+
+import { Test } from "forge-std/Test.sol";
+
+import { Utils, WebAuthnInfo } from "webauthn-sol/../test/Utils.sol";
+import { WebAuthn } from "webauthn-sol/WebAuthn.sol";
+
+contract SnapshotTest is Test {
+  using Utils for uint256;
+  using Utils for bytes32;
+
+  uint256 internal constant PRIVATE_KEY = uint256(0x03d99692017473e2d631945a812607b23269d85721e0f370b8d3e7d29a874fd2);
+  PublicKey public PUBLIC_KEY = abi.decode(
+    hex"1c05286fe694493eae33312f2d2e0d0abeda8db76238b7a204be1fb87f54ce4228fef61ef4ac300f631657635c28e59bfb2fe71bce1634c81c65642042f6dc4d",
+    (PublicKey)
+  );
+
+  function test(UserOperation calldata userOp) external {
+    bytes32 userOpHash = keccak256(abi.encode(userOp));
+    WebAuthnInfo memory webauthn = userOpHash.getWebAuthnStruct();
+    (bytes32 r, bytes32 s) = vm.signP256(PRIVATE_KEY, webauthn.messageHash);
+    assertTrue(
+      WebAuthn.verify({
+        challenge: abi.encode(userOpHash),
+        requireUV: false,
+        webAuthnAuth: WebAuthn.WebAuthnAuth({
+          authenticatorData: webauthn.authenticatorData,
+          clientDataJSON: webauthn.clientDataJSON,
+          typeIndex: 1,
+          challengeIndex: 23,
+          r: uint256(r),
+          s: uint256(s).normalizeS()
+        }),
+        x: PUBLIC_KEY.x,
+        y: PUBLIC_KEY.y
+      })
+    );
+  }
+}
+
+struct PublicKey {
+  uint256 x;
+  uint256 y;
+}
+
+struct UserOperation {
+  bytes field0;
+  bytes field1;
+  uint256 field2;
+  uint256 field3;
+  uint256 field4;
+}