diff --git a/Cargo.lock b/Cargo.lock
index 9a809bd..25bbbab 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2098,7 +2098,7 @@ dependencies = [
 [[package]]
 name = "dif-presentation-exchange"
 version = "0.1.0"
-source = "git+https://git@github.com/impierce/openid4vc.git?rev=12fed14#12fed1411ff3c0e1797090f386e44694f7a279b8"
+source = "git+https://git@github.com/impierce/openid4vc.git?rev=b4b7a56#b4b7a563e3168ee39e543b6d5966891b371d69ae"
 dependencies = [
  "getset",
  "jsonpath_lib",
@@ -4752,7 +4752,7 @@ dependencies = [
 [[package]]
 name = "oid4vc-core"
 version = "0.1.0"
-source = "git+https://git@github.com/impierce/openid4vc.git?rev=12fed14#12fed1411ff3c0e1797090f386e44694f7a279b8"
+source = "git+https://git@github.com/impierce/openid4vc.git?rev=b4b7a56#b4b7a563e3168ee39e543b6d5966891b371d69ae"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4776,7 +4776,7 @@ dependencies = [
 [[package]]
 name = "oid4vc-manager"
 version = "0.1.0"
-source = "git+https://git@github.com/impierce/openid4vc.git?rev=12fed14#12fed1411ff3c0e1797090f386e44694f7a279b8"
+source = "git+https://git@github.com/impierce/openid4vc.git?rev=b4b7a56#b4b7a563e3168ee39e543b6d5966891b371d69ae"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -4808,7 +4808,7 @@ dependencies = [
 [[package]]
 name = "oid4vci"
 version = "0.1.0"
-source = "git+https://git@github.com/impierce/openid4vc.git?rev=12fed14#12fed1411ff3c0e1797090f386e44694f7a279b8"
+source = "git+https://git@github.com/impierce/openid4vc.git?rev=b4b7a56#b4b7a563e3168ee39e543b6d5966891b371d69ae"
 dependencies = [
  "anyhow",
  "derivative",
@@ -4826,12 +4826,13 @@ dependencies = [
  "serde_urlencoded",
  "serde_with 3.8.1",
  "tokio",
+ "tracing",
 ]
 
 [[package]]
 name = "oid4vp"
 version = "0.1.0"
-source = "git+https://git@github.com/impierce/openid4vc.git?rev=12fed14#12fed1411ff3c0e1797090f386e44694f7a279b8"
+source = "git+https://git@github.com/impierce/openid4vc.git?rev=b4b7a56#b4b7a563e3168ee39e543b6d5966891b371d69ae"
 dependencies = [
  "anyhow",
  "chrono",
@@ -6694,7 +6695,7 @@ dependencies = [
 [[package]]
 name = "siopv2"
 version = "0.1.0"
-source = "git+https://git@github.com/impierce/openid4vc.git?rev=12fed14#12fed1411ff3c0e1797090f386e44694f7a279b8"
+source = "git+https://git@github.com/impierce/openid4vc.git?rev=b4b7a56#b4b7a563e3168ee39e543b6d5966891b371d69ae"
 dependencies = [
  "anyhow",
  "async-trait",
diff --git a/Cargo.toml b/Cargo.toml
index 0c2a182..bfb0f39 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,11 +20,16 @@ rust-version = "1.76.0"
 
 [workspace.dependencies]
 did_manager = { git = "https://git@github.com/impierce/did-manager.git", tag = "v1.0.0-beta.3" }
-siopv2 = { git = "https://git@github.com/impierce/openid4vc.git", rev = "12fed14" }
-oid4vci = { git = "https://git@github.com/impierce/openid4vc.git", rev = "12fed14" }
-oid4vc-core = { git = "https://git@github.com/impierce/openid4vc.git", rev = "12fed14" }
-oid4vc-manager = { git = "https://git@github.com/impierce/openid4vc.git", rev = "12fed14" }
-oid4vp = { git = "https://git@github.com/impierce/openid4vc.git", rev = "12fed14" }
+siopv2 = { git = "https://git@github.com/impierce/openid4vc.git", rev = "b4b7a56" }
+oid4vci = { git = "https://git@github.com/impierce/openid4vc.git", rev = "b4b7a56" }
+oid4vc-core = { git = "https://git@github.com/impierce/openid4vc.git", rev = "b4b7a56" }
+oid4vc-manager = { git = "https://git@github.com/impierce/openid4vc.git", rev = "b4b7a56" }
+oid4vp = { git = "https://git@github.com/impierce/openid4vc.git", rev = "b4b7a56" }
+# siopv2 = { path = "../openid4vc/siopv2" }
+# oid4vci = { path = "../openid4vc/oid4vci"}
+# oid4vc-core = { path = "../openid4vc/oid4vc-core"}
+# oid4vc-manager = { path = "../openid4vc/oid4vc-manager" }
+# oid4vp = { path = "../openid4vc/oid4vp" }
 
 async-trait = "0.1"
 axum = { version = "0.7", features = ["tracing"] }
diff --git a/agent_shared/src/verifier.rs b/agent_shared/src/verifier.rs
new file mode 100644
index 0000000..58a8927
--- /dev/null
+++ b/agent_shared/src/verifier.rs
@@ -0,0 +1,45 @@
+use std::str::FromStr as _;
+
+use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine as _};
+use identity_iota::{
+    core::{FromJson as _, ToJson as _},
+    verification::{
+        jwk::Jwk,
+        jws::{JwsVerifier, SignatureVerificationError, VerificationInput},
+    },
+};
+use jsonwebtoken::{crypto::verify, Algorithm, DecodingKey, Validation};
+
+/// This `Verifier` uses `jsonwebtoken` under the hood to verify verification input.
+pub struct Verifier;
+impl JwsVerifier for Verifier {
+    fn verify(&self, input: VerificationInput, public_key: &Jwk) -> Result<(), SignatureVerificationError> {
+        let algorithm = Algorithm::from_str(&input.alg.to_string()).unwrap();
+
+        println!("public_key: {:?}", public_key);
+
+        // Convert the `Jwk` first into a `jsonwebtoken::jwk::Jwk` and then into a `DecodingKey`.
+        let decoding_key = public_key
+            .to_json()
+            .ok()
+            .and_then(|public_key| jsonwebtoken::jwk::Jwk::from_json(&public_key).ok())
+            .and_then(|jwk| DecodingKey::from_jwk(&jwk).ok())
+            .unwrap();
+
+        let mut validation = Validation::new(algorithm);
+        validation.validate_aud = false;
+        validation.required_spec_claims.clear();
+
+        println!("validation: {:?}", validation);
+
+        verify(
+            &URL_SAFE_NO_PAD.encode(input.decoded_signature),
+            &input.signing_input,
+            &decoding_key,
+            algorithm,
+        )
+        .unwrap();
+
+        Ok(())
+    }
+}