diff --git a/wallet/src/helperfunctions.rs b/wallet/src/helperfunctions.rs
index eaa00a5..5f1dcf7 100644
--- a/wallet/src/helperfunctions.rs
+++ b/wallet/src/helperfunctions.rs
@@ -190,7 +190,7 @@ pub fn produce_data_for_storage(
     }
 }
 
-pub fn produce_random_nonces(size: usize) -> Vec<Nonce> {
+pub(crate) fn produce_random_nonces(size: usize) -> Vec<Nonce> {
     let mut result = vec![[0; 16]; size];
     result.iter_mut().for_each(|bytes| OsRng.fill_bytes(bytes));
     result.into_iter().map(Nonce::from_le_bytes).collect()
diff --git a/wallet/src/lib.rs b/wallet/src/lib.rs
index d679cd1..bc28311 100644
--- a/wallet/src/lib.rs
+++ b/wallet/src/lib.rs
@@ -35,7 +35,7 @@ pub mod cli;
 pub mod config;
 pub mod helperfunctions;
 pub mod poller;
-pub mod privacy_preserving_tx;
+mod privacy_preserving_tx;
 pub mod program_facades;
 
 pub struct WalletCore {
diff --git a/wallet/src/privacy_preserving_tx.rs b/wallet/src/privacy_preserving_tx.rs
index 5dec8af..e79bbac 100644
--- a/wallet/src/privacy_preserving_tx.rs
+++ b/wallet/src/privacy_preserving_tx.rs
@@ -164,15 +164,15 @@ impl AccountManager {
     }
 }
 
-pub struct AccountPreparedData {
-    pub nsk: Option<NullifierSecretKey>,
-    pub npk: NullifierPublicKey,
-    pub ipk: IncomingViewingPublicKey,
-    pub pre_state: AccountWithMetadata,
-    pub proof: Option<MembershipProof>,
+struct AccountPreparedData {
+    nsk: Option<NullifierSecretKey>,
+    npk: NullifierPublicKey,
+    ipk: IncomingViewingPublicKey,
+    pre_state: AccountWithMetadata,
+    proof: Option<MembershipProof>,
 }
 
-pub async fn private_acc_preparation(
+async fn private_acc_preparation(
     wallet: &WalletCore,
     account_id: AccountId,
 ) -> Result<AccountPreparedData, ExecutionFailureKind> {