diff --git a/.github/workflows/signature.yml b/.github/workflows/signature.yml
new file mode 100644
index 000000000..d57747d6c
--- /dev/null
+++ b/.github/workflows/signature.yml
@@ -0,0 +1,64 @@
+name: '@narval/signature CI'
+
+on:
+  push:
+    paths:
+      - packages/signature/**
+      - .github/workflows/signature.yml
+      - jest.config.ts
+      - jest.preset.js
+      - .eslintrc.json
+      - .prettierrc
+      - package.json
+      - package-lock.json
+
+jobs:
+  build-and-test:
+    name: Build and test
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Install Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '20.4.0'
+
+      - name: Install dependencies
+        run: |
+          make install/ci
+
+      - name: Code format
+        shell: bash
+        run: |
+          make signature/format/check
+          make signature/lint/check
+
+      - name: Test types
+        shell: bash
+        run: |
+          make signature/test/type
+
+      - name: Test upstream application types
+        shell: bash
+        run: |
+          make policy-engine/test/type
+
+      - name: Test unit
+        shell: bash
+        run: |
+          make signature/test/unit
+
+      - name: Send Slack notification on failure
+        if: failure() && github.ref == 'refs/heads/main'
+        uses: 8398a7/action-slack@v3
+        with:
+          username: GitHub
+          author_name: '@narval/signature CI failed'
+          status: ${{ job.status }}
+          fields: message,commit,author
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}
diff --git a/packages/signature/src/lib/__test__/unit/sign.spec.ts b/packages/signature/src/lib/__test__/unit/sign.spec.ts
index dd5105ffa..9c9dd8037 100644
--- a/packages/signature/src/lib/__test__/unit/sign.spec.ts
+++ b/packages/signature/src/lib/__test__/unit/sign.spec.ts
@@ -38,7 +38,14 @@ describe('sign', () => {
   it('should sign build & sign es256 JWT correctly with a PEM', async () => {
     const key = await importPKCS8(PRIVATE_KEY_PEM, Alg.ES256)
     const jwk = await exportJWK(key)
-    const jwt = await signJwt(payload, { ...jwk, alg: Alg.ES256, crv: 'P-256', kty: 'EC', kid: 'somekid' })
+    const jwt = await signJwt(payload, {
+      ...jwk,
+      alg: Alg.ES256,
+      crv: 'P-256',
+      kty: 'EC',
+      kid: 'somekid',
+      use: undefined
+    })
 
     const verified = await jwtVerify(jwt, key)
     expect(verified.payload).toEqual(payload)
diff --git a/packages/signature/src/lib/sign.ts b/packages/signature/src/lib/sign.ts
index 6bfbc9158..6692a70de 100644
--- a/packages/signature/src/lib/sign.ts
+++ b/packages/signature/src/lib/sign.ts
@@ -3,9 +3,9 @@ import { sha256 as sha256Hash } from '@noble/hashes/sha256'
 import { keccak_256 as keccak256 } from '@noble/hashes/sha3'
 import { SignJWT, base64url, importJWK } from 'jose'
 import { isHex, signatureToHex, toBytes, toHex } from 'viem'
+import { hash } from './hash-request'
 import { privateKeySchema } from './schemas'
 import { EcdsaSignature, Header, Hex, Jwk, JwsdHeader, Payload, PrivateKey, SigningAlg } from './types'
-import { hash } from './hash-request'
 import { hexToBase64Url } from './utils'
 import { validate } from './validate'
 
diff --git a/packages/signature/src/lib/utils.ts b/packages/signature/src/lib/utils.ts
index 9ab6be8fc..a0a91be62 100644
--- a/packages/signature/src/lib/utils.ts
+++ b/packages/signature/src/lib/utils.ts
@@ -155,8 +155,8 @@ const rsaKeyToKid = (jwk: Jwk) => {
 const generateRsaKeyPair = async (
   opts: {
     keyId?: string
-    modulusLength?: number,
-    use?: Use,
+    modulusLength?: number
+    use?: Use
   } = {
     modulusLength: 2048
   }
@@ -175,9 +175,9 @@ const generateRsaKeyPair = async (
     alg: Alg.RS256,
     kty: KeyTypes.RSA,
     crv: undefined,
-    use: opts.use || undefined,
+    use: opts.use || undefined
   }
-  jwk.kid = opts.keyId || rsaKeyToKid(jwk);
+  jwk.kid = opts.keyId || rsaKeyToKid(jwk)
 
   const pk = validate<RsaPrivateKey>(rsaPrivateKeySchema, jwk, 'Invalid RSA Private Key JWK')
   return pk
@@ -187,8 +187,8 @@ export const generateJwk = async (
   alg: Alg,
   opts?: {
     keyId?: string
-    modulusLength?: number,
-    use?: Use,
+    modulusLength?: number
+    use?: Use
   }
 ): Promise<Jwk> => {
   switch (alg) {
diff --git a/packages/signature/src/lib/verify.ts b/packages/signature/src/lib/verify.ts
index e191ee37b..178d8ad10 100644
--- a/packages/signature/src/lib/verify.ts
+++ b/packages/signature/src/lib/verify.ts
@@ -101,19 +101,19 @@ export async function verifyJwt(jwt: string, jwk: Jwk): Promise<Jwt> {
 }
 
 export async function verifyJwsd(jws: string, jwk: PublicKey): Promise<Jwsd> {
-    const { header, payload, signature } = decodeJwsd(jws)
+  const { header, payload, signature } = decodeJwsd(jws)
 
-    if (header.alg === SigningAlg.EIP191) {
-      await verifyEip191(jws, jwk)
-    } else {
-      // TODO: Implement other algs individually without jose
-      const joseJwk = await importJWK(jwk)
-      await jwtVerify(jws, joseJwk)
-    }
+  if (header.alg === SigningAlg.EIP191) {
+    await verifyEip191(jws, jwk)
+  } else {
+    // TODO: Implement other algs individually without jose
+    const joseJwk = await importJWK(jwk)
+    await jwtVerify(jws, joseJwk)
+  }
 
-    return {
-      header,
-      payload,
-      signature
-    }
+  return {
+    header,
+    payload,
+    signature
+  }
 }