diff --git a/rust/rbac-registration/Cargo.toml b/rust/rbac-registration/Cargo.toml
index d999c52fba..c818427c5f 100644
--- a/rust/rbac-registration/Cargo.toml
+++ b/rust/rbac-registration/Cargo.toml
@@ -32,6 +32,6 @@ uuid = "1.11.0"
 
 c509-certificate = { version = "0.0.3", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "v0.0.3" }
 pallas = { version = "0.30.1", git = "https://github.com/input-output-hk/catalyst-pallas.git", rev = "9b5183c8b90b90fe2cc319d986e933e9518957b3" }
-cbork-utils = { version = "0.0.1", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "r20250127-00" }
+cbork-utils = { version = "0.0.1", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "r20250212-00" }
 cardano-blockchain-types = { version = "0.0.1", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "r20250214-00" }
-catalyst-types = { version = "0.0.1", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "r20250127-00" }
+catalyst-types = { version = "0.0.1", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "r20250212-00" }
diff --git a/rust/rbac-registration/src/cardano/cip509/cip509.rs b/rust/rbac-registration/src/cardano/cip509/cip509.rs
index 086ca39ea3..b04ec7925e 100644
--- a/rust/rbac-registration/src/cardano/cip509/cip509.rs
+++ b/rust/rbac-registration/src/cardano/cip509/cip509.rs
@@ -5,10 +5,11 @@
 use std::{borrow::Cow, collections::HashMap};
 
 use anyhow::{anyhow, Context};
-use cardano_blockchain_types::{MetadatumLabel, MultiEraBlock, TxnIndex};
+use cardano_blockchain_types::{MetadatumLabel, MultiEraBlock, TransactionHash, TxnIndex};
 use catalyst_types::{
     cbor_utils::{report_duplicated_key, report_missing_keys},
     hashes::{Blake2b256Hash, BLAKE_2B256_SIZE},
+    id_uri::IdUri,
     problem_report::ProblemReport,
     uuid::UuidV4,
 };
@@ -59,7 +60,7 @@ pub struct Cip509 {
     /// An optional hash of the previous transaction.
     ///
     /// The hash must always be present except for the first registration transaction.
-    prv_tx_id: Option<Blake2b256Hash>,
+    prv_tx_id: Option<TransactionHash>,
     /// Metadata.
     ///
     /// This field encoded in chunks. See [`X509Chunks`] for more details.
@@ -72,10 +73,14 @@ pub struct Cip509 {
     /// constructors.
     payment_history: PaymentHistory,
     /// A hash of the transaction from which this registration is extracted.
-    txn_hash: Blake2b256Hash,
+    txn_hash: TransactionHash,
     /// A point (slot) and a transaction index identifying the block and the transaction
     /// that this `Cip509` was extracted from.
     origin: PointTxnIdx,
+    /// A catalyst ID.
+    ///
+    /// This field is only present in role 0 registrations.
+    catalyst_id: Option<IdUri>,
     /// A report potentially containing all the issues occurred during `Cip509` decoding
     /// and validation.
     ///
@@ -139,7 +144,7 @@ impl Cip509 {
             payment_history,
             report: &mut report,
         };
-        let cip509 =
+        let mut cip509 =
             Cip509::decode(&mut decoder, &mut decode_context).context("Failed to decode Cip509")?;
 
         // Perform the validation.
@@ -156,7 +161,7 @@ impl Cip509 {
             validate_stake_public_key(txn, cip509.certificate_uris(), &cip509.report);
         }
         if let Some(metadata) = &cip509.metadata {
-            validate_role_data(metadata, &cip509.report);
+            cip509.catalyst_id = validate_role_data(metadata, &cip509.report);
         }
 
         Ok(Some(cip509))
@@ -210,7 +215,7 @@ impl Cip509 {
 
     /// Returns a hash of the previous transaction.
     #[must_use]
-    pub fn previous_transaction(&self) -> Option<Blake2b256Hash> {
+    pub fn previous_transaction(&self) -> Option<TransactionHash> {
         self.prv_tx_id
     }
 
@@ -228,7 +233,7 @@ impl Cip509 {
 
     /// Returns a hash of the transaction where this data is originating from.
     #[must_use]
-    pub fn txn_hash(&self) -> Blake2b256Hash {
+    pub fn txn_hash(&self) -> TransactionHash {
         self.txn_hash
     }
 
@@ -244,6 +249,12 @@ impl Cip509 {
         self.txn_inputs_hash.as_ref()
     }
 
+    /// Returns a Catalyst ID of this registration if role 0 is present.
+    #[must_use]
+    pub fn catalyst_id(&self) -> Option<&IdUri> {
+        self.catalyst_id.as_ref()
+    }
+
     /// Returns `Cip509` fields consuming the structure if it was successfully decoded and
     /// validated otherwise return the problem report that contains all the encountered
     /// issues.
@@ -370,9 +381,10 @@ impl Decode<'_, DecodeContext<'_, '_>> for Cip509 {
                 .missing_field("metadata (10, 11 or 12 chunks)", context);
         }
 
-        let txn_hash = MultiEraTx::Conway(Box::new(Cow::Borrowed(decode_context.txn)))
-            .hash()
-            .into();
+        let txn_hash = Blake2b256Hash::from(
+            MultiEraTx::Conway(Box::new(Cow::Borrowed(decode_context.txn))).hash(),
+        )
+        .into();
         Ok(Self {
             purpose,
             txn_inputs_hash,
@@ -382,6 +394,7 @@ impl Decode<'_, DecodeContext<'_, '_>> for Cip509 {
             payment_history: HashMap::new(),
             txn_hash,
             origin: decode_context.origin.clone(),
+            catalyst_id: None,
             report: decode_context.report.clone(),
         })
     }
@@ -501,7 +514,7 @@ fn decode_input_hash(
 /// Decodes previous transaction id.
 fn decode_previous_transaction_id(
     d: &mut Decoder, context: &str, report: &ProblemReport,
-) -> Result<Option<Blake2b256Hash>, ()> {
+) -> Result<Option<TransactionHash>, ()> {
     let bytes = match decode_bytes(d, "Cip509 previous transaction id") {
         Ok(v) => v,
         Err(e) => {
@@ -515,7 +528,7 @@ fn decode_previous_transaction_id(
 
     let len = bytes.len();
     if let Ok(v) = Blake2b256Hash::try_from(bytes) {
-        Ok(Some(v))
+        Ok(Some(v.into()))
     } else {
         report.invalid_value(
             "previous transaction hash",
diff --git a/rust/rbac-registration/src/cardano/cip509/validation.rs b/rust/rbac-registration/src/cardano/cip509/validation.rs
index aec646aba2..885e23f846 100644
--- a/rust/rbac-registration/src/cardano/cip509/validation.rs
+++ b/rust/rbac-registration/src/cardano/cip509/validation.rs
@@ -6,11 +6,14 @@
 
 use std::borrow::Cow;
 
+use c509_certificate::c509::C509;
 use cardano_blockchain_types::{TxnWitness, VKeyHash};
 use catalyst_types::{
     hashes::{Blake2b128Hash, Blake2b256Hash},
+    id_uri::IdUri,
     problem_report::ProblemReport,
 };
+use ed25519_dalek::{VerifyingKey, PUBLIC_KEY_LENGTH};
 use pallas::{
     codec::{
         minicbor::{Encode, Encoder},
@@ -18,6 +21,7 @@ use pallas::{
     },
     ledger::{addresses::Address, primitives::conway, traverse::MultiEraTx},
 };
+use x509_cert::Certificate;
 
 use super::utils::cip19::compare_key_hash;
 use crate::cardano::cip509::{
@@ -158,9 +162,9 @@ fn extract_stake_addresses(uris: Option<&Cip0134UriSet>) -> Vec<VKeyHash> {
         .collect()
 }
 
-/// Checks that only role 0 uses certificates with zero index.
+/// Checks the role data.
 #[allow(clippy::similar_names)]
-pub fn validate_role_data(metadata: &Cip509RbacMetadata, report: &ProblemReport) {
+pub fn validate_role_data(metadata: &Cip509RbacMetadata, report: &ProblemReport) -> Option<IdUri> {
     let context = "Role data validation";
 
     if metadata.role_data.contains_key(&RoleNumber::ROLE_0) {
@@ -226,9 +230,10 @@ pub fn validate_role_data(metadata: &Cip509RbacMetadata, report: &ProblemReport)
         );
     }
 
+    let mut catalyst_id = None;
     for (number, data) in &metadata.role_data {
         if number == &RoleNumber::ROLE_0 {
-            validate_role_0(data, metadata, context, report);
+            catalyst_id = validate_role_0(data, metadata, context, report);
         } else {
             if let Some(signing_key) = data.signing_key() {
                 if signing_key.key_offset == 0 {
@@ -252,12 +257,13 @@ pub fn validate_role_data(metadata: &Cip509RbacMetadata, report: &ProblemReport)
             }
         }
     }
+    catalyst_id
 }
 
 /// Checks that the role 0 data is correct.
 fn validate_role_0(
     role: &RoleData, metadata: &Cip509RbacMetadata, context: &str, report: &ProblemReport,
-) {
+) -> Option<IdUri> {
     if let Some(key) = role.encryption_key() {
         report.invalid_value(
             "Role 0 encryption key",
@@ -269,7 +275,7 @@ fn validate_role_0(
 
     let Some(signing_key) = role.signing_key() else {
         report.missing_field("(Role 0) RoleData::signing_key", context);
-        return;
+        return None;
     };
 
     if signing_key.key_offset != 0 {
@@ -277,14 +283,18 @@ fn validate_role_0(
             &format!("The role 0 must reference a certificate with 0 index ({role:?})"),
             context,
         );
-        return;
+        return None;
     }
 
+    let mut catalyst_id = None;
+    let network = "cardano";
+
     match signing_key.local_ref {
         LocalRefInt::X509Certs => {
             match metadata.x509_certs.first() {
-                Some(X509DerCert::X509Cert(_)) => {
+                Some(X509DerCert::X509Cert(cert)) => {
                     // All good: role 0 references a valid X509 certificate.
+                    catalyst_id = x509_cert_key(cert, context, report).map(|k| IdUri::new(network, None, k));
                 }
                 Some(c) => report.other(&format!("Invalid X509 certificate value ({c:?}) for role 0 ({role:?})"), context),
                 None => report.other("Role 0 reference X509 certificate at index 0, but there is no such certificate", context),
@@ -292,8 +302,9 @@ fn validate_role_0(
         },
         LocalRefInt::C509Certs => {
             match metadata.c509_certs.first() {
-                Some(C509Cert::C509Certificate(_)) => {
+                Some(C509Cert::C509Certificate(cert)) => {
                     // All good: role 0 references a valid C509 certificate.
+                    catalyst_id = c509_cert_key(cert, context, report).map(|k| IdUri::new(network, None, k));
                 }
                 Some(c) => report.other(&format!("Invalid C509 certificate value ({c:?}) for role 0 ({role:?})"), context),
                 None => report.other("Role 0 reference C509 certificate at index 0, but there is no such certificate", context),
@@ -308,6 +319,77 @@ fn validate_role_0(
             );
         },
     }
+    catalyst_id
+}
+
+/// Extracts `VerifyingKey` from the given `X509` certificate.
+fn x509_cert_key(
+    cert: &Certificate, context: &str, report: &ProblemReport,
+) -> Option<VerifyingKey> {
+    let Some(extended_public_key) = cert
+        .tbs_certificate
+        .subject_public_key_info
+        .subject_public_key
+        .as_bytes()
+    else {
+        report.invalid_value(
+            "subject_public_key",
+            "is not octet aligned",
+            "Must not have unused bits",
+            context,
+        );
+        return None;
+    };
+    verifying_key(extended_public_key, context, report)
+}
+
+/// Extracts `VerifyingKey` from the given `C509` certificate.
+fn c509_cert_key(cert: &C509, context: &str, report: &ProblemReport) -> Option<VerifyingKey> {
+    verifying_key(cert.tbs_cert().subject_public_key(), context, report)
+}
+
+/// Creates `VerifyingKey` from the given extended public key.
+fn verifying_key(
+    extended_public_key: &[u8], context: &str, report: &ProblemReport,
+) -> Option<VerifyingKey> {
+    /// An extender public key length in bytes.
+    const EXTENDED_PUBLIC_KEY_LENGTH: usize = 64;
+
+    if extended_public_key.len() != EXTENDED_PUBLIC_KEY_LENGTH {
+        report.other(
+            &format!("Unexpected extended public key length in certificate: {}, expected {EXTENDED_PUBLIC_KEY_LENGTH}",
+                extended_public_key.len()),
+            context,
+        );
+        return None;
+    }
+
+    // This should never fail because of the check above.
+    let Some(public_key) = extended_public_key.get(0..PUBLIC_KEY_LENGTH) else {
+        report.other("Unable to get public key part", context);
+        return None;
+    };
+
+    let bytes: &[u8; PUBLIC_KEY_LENGTH] = match public_key.try_into() {
+        Ok(v) => v,
+        Err(e) => {
+            report.other(
+                &format!("Invalid public key length in X509 certificate: {e:?}"),
+                context,
+            );
+            return None;
+        },
+    };
+    match VerifyingKey::from_bytes(bytes) {
+        Ok(k) => Some(k),
+        Err(e) => {
+            report.other(
+                &format!("Invalid public key in C509 certificate: {e:?}"),
+                context,
+            );
+            None
+        },
+    }
 }
 
 #[cfg(test)]
diff --git a/rust/rbac-registration/src/registration/cardano/mod.rs b/rust/rbac-registration/src/registration/cardano/mod.rs
index 8d562944a4..0ac95fb4a1 100644
--- a/rust/rbac-registration/src/registration/cardano/mod.rs
+++ b/rust/rbac-registration/src/registration/cardano/mod.rs
@@ -4,7 +4,8 @@ use std::{collections::HashMap, sync::Arc};
 
 use anyhow::bail;
 use c509_certificate::c509::C509;
-use catalyst_types::{hashes::Blake2b256Hash, uuid::UuidV4};
+use cardano_blockchain_types::TransactionHash;
+use catalyst_types::uuid::UuidV4;
 use ed25519_dalek::VerifyingKey;
 use tracing::{error, warn};
 use x509_cert::certificate::Certificate as X509Certificate;
@@ -57,7 +58,7 @@ impl RegistrationChain {
 
     /// Get the current transaction ID hash.
     #[must_use]
-    pub fn current_tx_id_hash(&self) -> Blake2b256Hash {
+    pub fn current_tx_id_hash(&self) -> TransactionHash {
         self.inner.current_tx_id_hash
     }
 
@@ -108,7 +109,7 @@ impl RegistrationChain {
 #[derive(Debug, Clone)]
 struct RegistrationChainInner {
     /// The current transaction ID hash (32 bytes)
-    current_tx_id_hash: Blake2b256Hash,
+    current_tx_id_hash: TransactionHash,
     /// List of purpose for this registration chain
     purpose: Vec<UuidV4>,
 
diff --git a/rust/rbac-registration/src/utils/test.rs b/rust/rbac-registration/src/utils/test.rs
index 4d8b141da5..4a89c9ce94 100644
--- a/rust/rbac-registration/src/utils/test.rs
+++ b/rust/rbac-registration/src/utils/test.rs
@@ -2,8 +2,8 @@
 
 // cspell: words stake_test1urs8t0ssa3w9wh90ld5tprp3gurxd487rth2qlqk6ernjqcef4ugr
 
-use cardano_blockchain_types::{MultiEraBlock, Network, Point, Slot, TxnIndex};
-use catalyst_types::{hashes::Blake2b256Hash, uuid::UuidV4};
+use cardano_blockchain_types::{MultiEraBlock, Network, Point, Slot, TransactionHash, TxnIndex};
+use catalyst_types::uuid::UuidV4;
 use uuid::Uuid;
 
 use crate::cardano::cip509::{Cip509, RoleNumber};
@@ -20,9 +20,9 @@ pub struct BlockTestData {
     /// Transaction index.
     pub txn_index: TxnIndex,
     /// Transaction hash.
-    pub txn_hash: Blake2b256Hash,
+    pub txn_hash: TransactionHash,
     /// Previous hash.
-    pub prv_hash: Option<Blake2b256Hash>,
+    pub prv_hash: Option<TransactionHash>,
     /// Purpose.
     pub purpose: UuidV4,
     /// Stake address.