diff --git a/rust/rbac-registration/src/registration/cardano.rs b/rust/rbac-registration/src/registration/cardano/mod.rs
similarity index 83%
rename from rust/rbac-registration/src/registration/cardano.rs
rename to rust/rbac-registration/src/registration/cardano/mod.rs
index d73518cfec..318772903a 100644
--- a/rust/rbac-registration/src/registration/cardano.rs
+++ b/rust/rbac-registration/src/registration/cardano/mod.rs
@@ -1,15 +1,20 @@
 //! Chain of Cardano registration data
 
+pub mod payment_history;
+pub mod point_tx_idx;
+pub mod role_data;
+
 use std::{collections::HashMap, sync::Arc};
 
 use anyhow::bail;
 use c509_certificate::c509::C509;
 use pallas::{
-    codec::utils::Bytes,
-    crypto::hash::Hash,
-    ledger::{primitives::conway::Value, traverse::MultiEraTx},
+    codec::utils::Bytes, crypto::hash::Hash, ledger::traverse::MultiEraTx,
     network::miniprotocols::Point,
 };
+use payment_history::PaymentHistory;
+use point_tx_idx::PointTxIdx;
+use role_data::RoleData;
 use tracing::error;
 
 use crate::{
@@ -18,7 +23,6 @@ use crate::{
         rbac::{
             certs::{C509Cert, X509DerCert},
             pub_key::{Ed25519PublicKey, SimplePublicKeyType},
-            role_data::KeyLocalRef,
             CertKeyHash,
         },
         Cip509, UuidV4,
@@ -78,139 +82,86 @@ impl RegistrationChain {
         })
     }
 
-    /// Get the registration chain inner.
+    /// Get the current transaction ID hash.
     #[must_use]
-    pub fn registration_chain(&self) -> &RegistrationChainInner {
-        self.inner.as_ref()
-    }
-}
-
-/// Inner structure of registration chain.
-#[derive(Clone)]
-pub struct RegistrationChainInner {
-    /// The current transaction ID hash (32 bytes)
-    current_tx_id_hash: Hash<32>,
-    /// List of purpose for this registration chain
-    purpose: Vec<UuidV4>,
-
-    // RBAC
-    /// Map of index in array to point, transaction index, and x509 certificate.
-    x509_certs: HashMap<usize, (PointTxIdx, Vec<u8>)>,
-    /// Map of index in array to point, transaction index, and c509 certificate.
-    c509_certs: HashMap<usize, (PointTxIdx, C509)>,
-    /// Map of index in array to point, transaction index, and public key.
-    simple_keys: HashMap<usize, (PointTxIdx, Ed25519PublicKey)>,
-    /// List of point, transaction index, and certificate key hash.
-    revocations: Vec<(PointTxIdx, CertKeyHash)>,
-
-    // Role
-    /// Map of role number to point, transaction index, and role data.
-    role_data: HashMap<u8, (PointTxIdx, RoleData)>,
-    /// List of payment keys to track.
-    tracking_payment_keys: Arc<Vec<Ed25519PublicKey>>,
-    /// Map of payment key to its history.
-    payment_history: HashMap<Ed25519PublicKey, Vec<PaymentHistory>>,
-}
-
-/// Point (slot) and transaction index.
-#[derive(Clone)]
-pub struct PointTxIdx((Point, usize));
-
-impl PointTxIdx {
-    /// Create an instance of point and transaction index.
-    pub(crate) fn new(point: Point, tx_idx: usize) -> Self {
-        PointTxIdx((point, tx_idx))
+    pub fn current_tx_id_hash(&self) -> Hash<32> {
+        self.inner.current_tx_id_hash
     }
 
-    /// Get the point.
+    /// Get a list of purpose for this registration chain.
     #[must_use]
-    pub fn point(&self) -> &Point {
-        &self.0 .0
+    pub fn purpose(&self) -> &[UuidV4] {
+        &self.inner.purpose
     }
 
-    /// Get the transaction index.
+    /// Get the map of index in array to point, transaction index, and x509 certificate.
     #[must_use]
-    pub fn tx_idx(&self) -> usize {
-        self.0 .1
+    pub fn x509_certs(&self) -> &HashMap<usize, (PointTxIdx, Vec<u8>)> {
+        &self.inner.x509_certs
     }
-}
-
-/// Payment history of the public key in tracking payment keys.
-#[derive(Clone)]
-pub struct PaymentHistory {
-    /// The point and transaction index.
-    point_tx_idx: PointTxIdx,
-    /// Transaction hash that this payment come from.
-    tx_hash: Hash<32>,
-    /// The transaction output index that this payment come from.
-    output_index: u16,
-    /// The value of the payment.
-    value: Value,
-}
 
-impl PaymentHistory {
-    /// Get the point and transaction index.
+    /// Get the map of index in array to point, transaction index, and c509 certificate.
     #[must_use]
-    pub fn point_tx_idx(&self) -> &PointTxIdx {
-        &self.point_tx_idx
+    pub fn c509_certs(&self) -> &HashMap<usize, (PointTxIdx, C509)> {
+        &self.inner.c509_certs
     }
 
-    /// Get the transaction hash.
+    /// Get the map of index in array to point, transaction index, and public key.
     #[must_use]
-    pub fn tx_hash(&self) -> Hash<32> {
-        self.tx_hash
+    pub fn simple_keys(&self) -> &HashMap<usize, (PointTxIdx, Ed25519PublicKey)> {
+        &self.inner.simple_keys
     }
 
-    /// Get the transaction output index.
+    /// Get a list of revocations.
     #[must_use]
-    pub fn output_index(&self) -> u16 {
-        self.output_index
+    pub fn revocations(&self) -> &[(PointTxIdx, CertKeyHash)] {
+        &self.inner.revocations
     }
 
-    /// Get the value of the payment.
+    /// Get the map of role number to point, transaction index, and role data.
     #[must_use]
-    pub fn value(&self) -> &Value {
-        &self.value
+    pub fn role_data(&self) -> &HashMap<u8, (PointTxIdx, RoleData)> {
+        &self.inner.role_data
     }
-}
-
-/// Role data
-#[derive(Clone)]
-pub struct RoleData {
-    /// A signing keys to the data within registration.
-    signing_key_ref: Option<KeyLocalRef>,
-    /// An encryption keys to the data within registration.
-    encryption_ref: Option<KeyLocalRef>,
-    /// A payment key where reward will be distributed to.
-    payment_key: Ed25519PublicKey,
-    /// Map of role extended data (10-99) to its data
-    role_extended_data: HashMap<u8, Vec<u8>>,
-}
 
-impl RoleData {
-    /// Get the reference of signing keys.
+    /// Get the list of payment keys to track.
     #[must_use]
-    pub fn signing_key_ref(&self) -> &Option<KeyLocalRef> {
-        &self.signing_key_ref
+    pub fn tracking_payment_keys(&self) -> &Vec<Ed25519PublicKey> {
+        &self.inner.tracking_payment_keys
     }
 
-    /// Get the reference of encryption keys.
+    /// Get the map of payment key to its history.
     #[must_use]
-    pub fn encryption_ref(&self) -> &Option<KeyLocalRef> {
-        &self.encryption_ref
+    pub fn payment_history(&self) -> &HashMap<Ed25519PublicKey, Vec<PaymentHistory>> {
+        &self.inner.payment_history
     }
+}
 
-    /// Get the payment key.
-    #[must_use]
-    pub fn payment_key(&self) -> &Ed25519PublicKey {
-        &self.payment_key
-    }
+/// Inner structure of registration chain.
+#[derive(Clone)]
+struct RegistrationChainInner {
+    /// The current transaction ID hash (32 bytes)
+    current_tx_id_hash: Hash<32>,
+    /// List of purpose for this registration chain
+    purpose: Vec<UuidV4>,
 
-    /// Get the role extended data.
-    #[must_use]
-    pub fn role_extended_data(&self) -> &HashMap<u8, Vec<u8>> {
-        &self.role_extended_data
-    }
+    // RBAC
+    /// Map of index in array to point, transaction index, and x509 certificate.
+    x509_certs: HashMap<usize, (PointTxIdx, Vec<u8>)>,
+    /// Map of index in array to point, transaction index, and c509 certificate.
+    c509_certs: HashMap<usize, (PointTxIdx, C509)>,
+    /// Map of index in array to point, transaction index, and public key.
+    simple_keys: HashMap<usize, (PointTxIdx, Ed25519PublicKey)>,
+    /// List of point, transaction index, and certificate key hash.
+    revocations: Vec<(PointTxIdx, CertKeyHash)>,
+
+    // Role
+    /// Map of role number to point, transaction index, and role data.
+    role_data: HashMap<u8, (PointTxIdx, RoleData)>,
+    /// List of payment keys to track.
+    tracking_payment_keys: Arc<Vec<Ed25519PublicKey>>,
+    /// Map of payment key to its history.
+    payment_history: HashMap<Ed25519PublicKey, Vec<PaymentHistory>>,
 }
 
 impl RegistrationChainInner {
@@ -287,7 +238,7 @@ impl RegistrationChainInner {
     /// # Errors
     ///
     /// Returns an error if data is invalid
-    pub fn update(
+    fn update(
         &self, point: Point, tx_idx: usize, txn: &MultiEraTx, cip509: Cip509,
     ) -> anyhow::Result<Self> {
         let mut new_inner = self.clone();
@@ -342,60 +293,6 @@ impl RegistrationChainInner {
 
         Ok(new_inner)
     }
-
-    /// Get the current transaction ID hash.
-    #[must_use]
-    pub fn current_tx_id_hash(&self) -> Hash<32> {
-        self.current_tx_id_hash
-    }
-
-    /// Get a list of purpose for this registration chain.
-    #[must_use]
-    pub fn purpose(&self) -> &[UuidV4] {
-        &self.purpose
-    }
-
-    /// Get the map of index in array to point, transaction index, and x509 certificate.
-    #[must_use]
-    pub fn x509_certs(&self) -> &HashMap<usize, (PointTxIdx, Vec<u8>)> {
-        &self.x509_certs
-    }
-
-    /// Get the map of index in array to point, transaction index, and c509 certificate.
-    #[must_use]
-    pub fn c509_certs(&self) -> &HashMap<usize, (PointTxIdx, C509)> {
-        &self.c509_certs
-    }
-
-    /// Get the map of index in array to point, transaction index, and public key.
-    #[must_use]
-    pub fn simple_keys(&self) -> &HashMap<usize, (PointTxIdx, Ed25519PublicKey)> {
-        &self.simple_keys
-    }
-
-    /// Get a list of revocations.
-    #[must_use]
-    pub fn revocations(&self) -> &[(PointTxIdx, CertKeyHash)] {
-        &self.revocations
-    }
-
-    /// Get the map of role number to point, transaction index, and role data.
-    #[must_use]
-    pub fn role_data(&self) -> &HashMap<u8, (PointTxIdx, RoleData)> {
-        &self.role_data
-    }
-
-    /// Get the list of payment keys to track.
-    #[must_use]
-    pub fn tracking_payment_keys(&self) -> &Vec<Ed25519PublicKey> {
-        &self.tracking_payment_keys
-    }
-
-    /// Get the map of payment key to its history.
-    #[must_use]
-    pub fn payment_history(&self) -> &HashMap<Ed25519PublicKey, Vec<PaymentHistory>> {
-        &self.payment_history
-    }
 }
 
 /// Process x509 certificate for chain root.
@@ -556,12 +453,15 @@ fn chain_root_role_data(
             // Map of role number to point and role data
             role_data_map.insert(
                 role_data.role_number,
-                (point_tx_idx.clone(), RoleData {
-                    signing_key_ref: signing_key,
-                    encryption_ref: encryption_key,
-                    payment_key,
-                    role_extended_data: role_data.role_extended_data_keys.clone(),
-                }),
+                (
+                    point_tx_idx.clone(),
+                    RoleData::new(
+                        signing_key,
+                        encryption_key,
+                        payment_key,
+                        role_data.role_extended_data_keys.clone(),
+                    ),
+                ),
             );
         }
     }
@@ -580,7 +480,7 @@ fn update_role_data(
                 Some(key) => Some(key),
                 None => {
                     match inner.role_data.get(&role_data.role_number) {
-                        Some((_, role_data)) => role_data.signing_key_ref.clone(),
+                        Some((_, role_data)) => role_data.signing_key_ref().clone(),
                         None => None,
                     }
                 },
@@ -591,7 +491,7 @@ fn update_role_data(
                 Some(key) => Some(key),
                 None => {
                     match inner.role_data.get(&role_data.role_number) {
-                        Some((_, role_data)) => role_data.encryption_ref.clone(),
+                        Some((_, role_data)) => role_data.encryption_ref().clone(),
                         None => None,
                     }
                 },
@@ -602,12 +502,15 @@ fn update_role_data(
             // Note that new role data will overwrite the old one
             inner.role_data.insert(
                 role_data.role_number,
-                (point_tx_idx.clone(), RoleData {
-                    signing_key_ref: signing_key,
-                    encryption_ref: encryption_key,
-                    payment_key,
-                    role_extended_data: role_data.role_extended_data_keys.clone(),
-                }),
+                (
+                    point_tx_idx.clone(),
+                    RoleData::new(
+                        signing_key,
+                        encryption_key,
+                        payment_key,
+                        role_data.role_extended_data_keys.clone(),
+                    ),
+                ),
             );
         }
     }
@@ -668,12 +571,12 @@ fn update_payment_history(
                             anyhow::anyhow!("Cannot convert usize to u16 in update payment history")
                         })?;
 
-                        payment_history.push(PaymentHistory {
-                            point_tx_idx: point_tx_idx.clone(),
-                            tx_hash: txn.hash(),
+                        payment_history.push(PaymentHistory::new(
+                            point_tx_idx.clone(),
+                            txn.hash(),
                             output_index,
-                            value: o.value.clone(),
-                        });
+                            o.value.clone(),
+                        ));
                     }
                 },
                 pallas::ledger::primitives::conway::PseudoTransactionOutput::Legacy(_) => {
diff --git a/rust/rbac-registration/src/registration/cardano/payment_history.rs b/rust/rbac-registration/src/registration/cardano/payment_history.rs
new file mode 100644
index 0000000000..13e4aabc5d
--- /dev/null
+++ b/rust/rbac-registration/src/registration/cardano/payment_history.rs
@@ -0,0 +1,56 @@
+//! Payment history of the public key in tracking payment keys.
+
+use pallas::{crypto::hash::Hash, ledger::primitives::conway::Value};
+
+use super::point_tx_idx::PointTxIdx;
+
+/// Payment history of the public key in tracking payment keys.
+#[derive(Clone)]
+pub struct PaymentHistory {
+    /// The point and transaction index.
+    point_tx_idx: PointTxIdx,
+    /// Transaction hash that this payment come from.
+    tx_hash: Hash<32>,
+    /// The transaction output index that this payment come from.
+    output_index: u16,
+    /// The value of the payment.
+    value: Value,
+}
+
+impl PaymentHistory {
+    /// Create an instance of payment history.
+    pub(crate) fn new(
+        point_tx_idx: PointTxIdx, tx_hash: Hash<32>, output_index: u16, value: Value,
+    ) -> Self {
+        PaymentHistory {
+            point_tx_idx,
+            tx_hash,
+            output_index,
+            value,
+        }
+    }
+
+    /// Get the point and transaction index.
+    #[must_use]
+    pub fn point_tx_idx(&self) -> &PointTxIdx {
+        &self.point_tx_idx
+    }
+
+    /// Get the transaction hash.
+    #[must_use]
+    pub fn tx_hash(&self) -> Hash<32> {
+        self.tx_hash
+    }
+
+    /// Get the transaction output index.
+    #[must_use]
+    pub fn output_index(&self) -> u16 {
+        self.output_index
+    }
+
+    /// Get the value of the payment.
+    #[must_use]
+    pub fn value(&self) -> &Value {
+        &self.value
+    }
+}
diff --git a/rust/rbac-registration/src/registration/cardano/point_tx_idx.rs b/rust/rbac-registration/src/registration/cardano/point_tx_idx.rs
new file mode 100644
index 0000000000..27247dd5c2
--- /dev/null
+++ b/rust/rbac-registration/src/registration/cardano/point_tx_idx.rs
@@ -0,0 +1,26 @@
+//! Point or absolute slot and transaction index.
+
+use pallas::network::miniprotocols::Point;
+
+/// Point (slot) and transaction index.
+#[derive(Clone)]
+pub struct PointTxIdx((Point, usize));
+
+impl PointTxIdx {
+    /// Create an instance of point and transaction index.
+    pub(crate) fn new(point: Point, tx_idx: usize) -> Self {
+        PointTxIdx((point, tx_idx))
+    }
+
+    /// Get the point.
+    #[must_use]
+    pub fn point(&self) -> &Point {
+        &self.0 .0
+    }
+
+    /// Get the transaction index.
+    #[must_use]
+    pub fn tx_idx(&self) -> usize {
+        self.0 .1
+    }
+}
diff --git a/rust/rbac-registration/src/registration/cardano/role_data.rs b/rust/rbac-registration/src/registration/cardano/role_data.rs
new file mode 100644
index 0000000000..684671415e
--- /dev/null
+++ b/rust/rbac-registration/src/registration/cardano/role_data.rs
@@ -0,0 +1,57 @@
+//! RBAC role data
+
+use std::collections::HashMap;
+
+use crate::cardano::cip509::rbac::{pub_key::Ed25519PublicKey, role_data::KeyLocalRef};
+
+/// Role data
+#[derive(Clone)]
+pub struct RoleData {
+    /// A signing keys to the data within registration.
+    signing_key_ref: Option<KeyLocalRef>,
+    /// An encryption keys to the data within registration.
+    encryption_ref: Option<KeyLocalRef>,
+    /// A payment key where reward will be distributed to.
+    payment_key: Ed25519PublicKey,
+    /// Map of role extended data (10-99) to its data
+    role_extended_data: HashMap<u8, Vec<u8>>,
+}
+
+impl RoleData {
+    /// Create an instance of role data.
+    pub(crate) fn new(
+        signing_key_ref: Option<KeyLocalRef>, encryption_ref: Option<KeyLocalRef>,
+        payment_key: Ed25519PublicKey, role_extended_data: HashMap<u8, Vec<u8>>,
+    ) -> Self {
+        RoleData {
+            signing_key_ref,
+            encryption_ref,
+            payment_key,
+            role_extended_data,
+        }
+    }
+
+    /// Get the reference of signing keys.
+    #[must_use]
+    pub fn signing_key_ref(&self) -> &Option<KeyLocalRef> {
+        &self.signing_key_ref
+    }
+
+    /// Get the reference of encryption keys.
+    #[must_use]
+    pub fn encryption_ref(&self) -> &Option<KeyLocalRef> {
+        &self.encryption_ref
+    }
+
+    /// Get the payment key.
+    #[must_use]
+    pub fn payment_key(&self) -> &Ed25519PublicKey {
+        &self.payment_key
+    }
+
+    /// Get the role extended data.
+    #[must_use]
+    pub fn role_extended_data(&self) -> &HashMap<u8, Vec<u8>> {
+        &self.role_extended_data
+    }
+}