diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0bdda9af..20b19fd7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -143,7 +143,7 @@ jobs:
         if: ${{ runner.os == 'Linux' }}
         run: |
           if [ -n "${{ matrix.use_cross }}" ]; then
-            cargo install --git https://github.com/cross-rs/cross --tag v${{ env.CROSS_VERSION }} cross
+            cargo install --locked  --git https://github.com/cross-rs/cross --tag v${{ env.CROSS_VERSION }} cross
             cross build --release --package anoncreds --target ${{matrix.target}} --features vendored
           else
             cargo build --release --package anoncreds --target ${{matrix.target}} --features vendored
diff --git a/Cargo.toml b/Cargo.toml
index 202c51b3..929ac597 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ vendored = ["anoncreds-clsignatures/openssl_vendored"]
 w3c = ["base64", "chrono"]
 
 [dependencies]
-anoncreds-clsignatures = "0.2.4"
+anoncreds-clsignatures = "0.3.0"
 bs58 = "0.4.0"
 env_logger = { version = "0.9.3", optional = true }
 ffi-support = { version = "0.4.0", optional = true }
diff --git a/src/ffi/w3c/credential.rs b/src/ffi/w3c/credential.rs
index 7c5210ee..a7f45119 100644
--- a/src/ffi/w3c/credential.rs
+++ b/src/ffi/w3c/credential.rs
@@ -1,5 +1,7 @@
 use crate::data_types::w3c::VerifiableCredentialSpecVersion;
-use ffi_support::FfiStr;
+use ffi_support::{rust_string_to_c, FfiStr};
+use std::ffi::c_char;
+use std::ptr;
 
 use crate::data_types::w3c::credential::W3CCredential;
 use crate::data_types::w3c::credential_attributes::CredentialAttributes;
@@ -209,6 +211,36 @@ pub extern "C" fn anoncreds_w3c_credential_get_integrity_proof_details(
     })
 }
 
+#[no_mangle]
+pub extern "C" fn anoncreds_w3c_credential_proof_get_attribute(
+    handle: ObjectHandle,
+    name: FfiStr,
+    result_p: *mut *const c_char,
+) -> ErrorCode {
+    catch_error(|| {
+        check_useful_c_ptr!(result_p);
+        let cred = handle.load()?;
+        let cred = cred.cast_ref::<CredentialProofDetails>()?;
+        let val = match name.as_opt_str().unwrap_or_default() {
+            "schema_id" => rust_string_to_c(cred.schema_id.clone()),
+            "cred_def_id" => rust_string_to_c(cred.cred_def_id.to_string()),
+            "rev_reg_id" => cred
+                .rev_reg_id
+                .as_ref()
+                .map_or(ptr::null_mut(), |s| rust_string_to_c(s.to_string())),
+            "rev_reg_index" => cred
+                .rev_reg_index
+                .map_or(ptr::null_mut(), |s| rust_string_to_c(s.to_string())),
+            "timestamp" => cred
+                .timestamp
+                .map_or(ptr::null_mut(), |s| rust_string_to_c(s.to_string())),
+            s => return Err(err_msg!("Unsupported attribute: {}", s)),
+        };
+        unsafe { *result_p = val };
+        Ok(())
+    })
+}
+
 impl_anoncreds_object!(CredentialProofDetails, "CredentialProofInfo");
 
 pub(crate) fn _credential_attributes(