diff --git a/wallet-ffi/src/lib.rs b/wallet-ffi/src/lib.rs
index e7f2ce98..99a0ee98 100644
--- a/wallet-ffi/src/lib.rs
+++ b/wallet-ffi/src/lib.rs
@@ -23,6 +23,7 @@
 pub mod account;
 pub mod error;
 pub mod keys;
+pub mod pinata;
 pub mod sync;
 pub mod transfer;
 pub mod types;
diff --git a/wallet-ffi/src/pinata.rs b/wallet-ffi/src/pinata.rs
new file mode 100644
index 00000000..2cf2fc84
--- /dev/null
+++ b/wallet-ffi/src/pinata.rs
@@ -0,0 +1,308 @@
+//! Pinata program interaction functions.
+
+use std::{ffi::CString, ptr, slice};
+
+use common::error::ExecutionFailureKind;
+use nssa::AccountId;
+use nssa_core::MembershipProof;
+use wallet::program_facades::pinata::Pinata;
+
+use crate::{
+    block_on,
+    error::{print_error, WalletFfiError},
+    types::{FfiBytes32, FfiTransferResult, WalletHandle},
+    wallet::get_wallet,
+};
+
+/// Claim a pinata reward using a public transaction.
+///
+/// Sends a public claim transaction to the pinata program.
+///
+/// # Parameters
+/// - `handle`: Valid wallet handle
+/// - `pinata_account_id`: The pinata program account ID
+/// - `winner_account_id`: The recipient account ID
+/// - `solution`: The solution value as little-endian [u8; 16]
+/// - `out_result`: Output pointer for the transaction result
+///
+/// # Returns
+/// - `Success` if the claim transaction was submitted successfully
+/// - Error code on failure
+///
+/// # Memory
+/// The result must be freed with `wallet_ffi_free_transfer_result()`.
+///
+/// # Safety
+/// - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+/// - `pinata_account_id` must be a valid pointer to a `FfiBytes32` struct
+/// - `winner_account_id` must be a valid pointer to a `FfiBytes32` struct
+/// - `solution` must be a valid pointer to a `[u8; 16]` array
+/// - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+#[no_mangle]
+pub unsafe extern "C" fn wallet_ffi_claim_pinata(
+    handle: *mut WalletHandle,
+    pinata_account_id: *const FfiBytes32,
+    winner_account_id: *const FfiBytes32,
+    solution: *const [u8; 16],
+    out_result: *mut FfiTransferResult,
+) -> WalletFfiError {
+    let wrapper = match get_wallet(handle) {
+        Ok(w) => w,
+        Err(e) => return e,
+    };
+
+    if pinata_account_id.is_null()
+        || winner_account_id.is_null()
+        || solution.is_null()
+        || out_result.is_null()
+    {
+        print_error("Null pointer argument");
+        return WalletFfiError::NullPointer;
+    }
+
+    let wallet = match wrapper.core.lock() {
+        Ok(w) => w,
+        Err(e) => {
+            print_error(format!("Failed to lock wallet: {}", e));
+            return WalletFfiError::InternalError;
+        }
+    };
+
+    let pinata_id = AccountId::new(unsafe { (*pinata_account_id).data });
+    let winner_id = AccountId::new(unsafe { (*winner_account_id).data });
+    let solution = u128::from_le_bytes(unsafe { *solution });
+
+    let pinata = Pinata(&wallet);
+
+    match block_on(pinata.claim(pinata_id, winner_id, solution)) {
+        Ok(Ok(response)) => {
+            let tx_hash = CString::new(response.tx_hash.to_string())
+                .map(|s| s.into_raw())
+                .unwrap_or(ptr::null_mut());
+
+            unsafe {
+                (*out_result).tx_hash = tx_hash;
+                (*out_result).success = true;
+            }
+            WalletFfiError::Success
+        }
+        Ok(Err(e)) => {
+            print_error(format!("Pinata claim failed: {:?}", e));
+            unsafe {
+                (*out_result).tx_hash = ptr::null_mut();
+                (*out_result).success = false;
+            }
+            map_execution_error(e)
+        }
+        Err(e) => e,
+    }
+}
+
+/// Claim a pinata reward using a private transaction for an already-initialized owned account.
+///
+/// Sends a privacy-preserving claim transaction for a winner account that already has
+/// an on-chain commitment (i.e. was previously initialized).
+///
+/// # Parameters
+/// - `handle`: Valid wallet handle
+/// - `pinata_account_id`: The pinata program account ID
+/// - `winner_account_id`: The recipient private account ID (must be owned by this wallet)
+/// - `solution`: The solution value as little-endian [u8; 16]
+/// - `winner_proof_index`: Leaf index in the commitment tree for the membership proof
+/// - `winner_proof_siblings`: Pointer to an array of 32-byte sibling hashes
+/// - `winner_proof_siblings_len`: Number of sibling hashes in the array
+/// - `out_result`: Output pointer for the transaction result
+///
+/// # Returns
+/// - `Success` if the claim transaction was submitted successfully
+/// - Error code on failure
+///
+/// # Memory
+/// The result must be freed with `wallet_ffi_free_transfer_result()`.
+///
+/// # Safety
+/// - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+/// - `pinata_account_id` must be a valid pointer to a `FfiBytes32` struct
+/// - `winner_account_id` must be a valid pointer to a `FfiBytes32` struct
+/// - `solution` must be a valid pointer to a `[u8; 16]` array
+/// - `winner_proof_siblings` must be a valid pointer to an array of `winner_proof_siblings_len`
+///   elements of `[u8; 32]`, or null if `winner_proof_siblings_len` is 0
+/// - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+#[no_mangle]
+pub unsafe extern "C" fn wallet_ffi_claim_pinata_private_owned_already_initialized(
+    handle: *mut WalletHandle,
+    pinata_account_id: *const FfiBytes32,
+    winner_account_id: *const FfiBytes32,
+    solution: *const [u8; 16],
+    winner_proof_index: usize,
+    winner_proof_siblings: *const [u8; 32],
+    winner_proof_siblings_len: usize,
+    out_result: *mut FfiTransferResult,
+) -> WalletFfiError {
+    let wrapper = match get_wallet(handle) {
+        Ok(w) => w,
+        Err(e) => return e,
+    };
+
+    if pinata_account_id.is_null()
+        || winner_account_id.is_null()
+        || solution.is_null()
+        || out_result.is_null()
+    {
+        print_error("Null pointer argument");
+        return WalletFfiError::NullPointer;
+    }
+
+    if winner_proof_siblings_len > 0 && winner_proof_siblings.is_null() {
+        print_error("Null proof siblings pointer with non-zero length");
+        return WalletFfiError::NullPointer;
+    }
+
+    let wallet = match wrapper.core.lock() {
+        Ok(w) => w,
+        Err(e) => {
+            print_error(format!("Failed to lock wallet: {}", e));
+            return WalletFfiError::InternalError;
+        }
+    };
+
+    let pinata_id = AccountId::new(unsafe { (*pinata_account_id).data });
+    let winner_id = AccountId::new(unsafe { (*winner_account_id).data });
+    let solution = u128::from_le_bytes(unsafe { *solution });
+
+    let siblings = if winner_proof_siblings_len > 0 {
+        unsafe { slice::from_raw_parts(winner_proof_siblings, winner_proof_siblings_len).to_vec() }
+    } else {
+        vec![]
+    };
+    let proof: MembershipProof = (winner_proof_index, siblings);
+
+    let pinata = Pinata(&wallet);
+
+    match block_on(
+        pinata
+            .claim_private_owned_account_already_initialized(pinata_id, winner_id, solution, proof),
+    ) {
+        Ok(Ok((response, _shared_key))) => {
+            let tx_hash = CString::new(response.tx_hash.to_string())
+                .map(|s| s.into_raw())
+                .unwrap_or(ptr::null_mut());
+
+            unsafe {
+                (*out_result).tx_hash = tx_hash;
+                (*out_result).success = true;
+            }
+            WalletFfiError::Success
+        }
+        Ok(Err(e)) => {
+            print_error(format!(
+                "Pinata private claim (already initialized) failed: {:?}",
+                e
+            ));
+            unsafe {
+                (*out_result).tx_hash = ptr::null_mut();
+                (*out_result).success = false;
+            }
+            map_execution_error(e)
+        }
+        Err(e) => e,
+    }
+}
+
+/// Claim a pinata reward using a private transaction for a not-yet-initialized owned account.
+///
+/// Sends a privacy-preserving claim transaction for a winner account that has not yet
+/// been committed on-chain (i.e. is being initialized as part of this claim).
+///
+/// # Parameters
+/// - `handle`: Valid wallet handle
+/// - `pinata_account_id`: The pinata program account ID
+/// - `winner_account_id`: The recipient private account ID (must be owned by this wallet)
+/// - `solution`: The solution value as little-endian [u8; 16]
+/// - `out_result`: Output pointer for the transaction result
+///
+/// # Returns
+/// - `Success` if the claim transaction was submitted successfully
+/// - Error code on failure
+///
+/// # Memory
+/// The result must be freed with `wallet_ffi_free_transfer_result()`.
+///
+/// # Safety
+/// - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+/// - `pinata_account_id` must be a valid pointer to a `FfiBytes32` struct
+/// - `winner_account_id` must be a valid pointer to a `FfiBytes32` struct
+/// - `solution` must be a valid pointer to a `[u8; 16]` array
+/// - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+#[no_mangle]
+pub unsafe extern "C" fn wallet_ffi_claim_pinata_private_owned_not_initialized(
+    handle: *mut WalletHandle,
+    pinata_account_id: *const FfiBytes32,
+    winner_account_id: *const FfiBytes32,
+    solution: *const [u8; 16],
+    out_result: *mut FfiTransferResult,
+) -> WalletFfiError {
+    let wrapper = match get_wallet(handle) {
+        Ok(w) => w,
+        Err(e) => return e,
+    };
+
+    if pinata_account_id.is_null()
+        || winner_account_id.is_null()
+        || solution.is_null()
+        || out_result.is_null()
+    {
+        print_error("Null pointer argument");
+        return WalletFfiError::NullPointer;
+    }
+
+    let wallet = match wrapper.core.lock() {
+        Ok(w) => w,
+        Err(e) => {
+            print_error(format!("Failed to lock wallet: {}", e));
+            return WalletFfiError::InternalError;
+        }
+    };
+
+    let pinata_id = AccountId::new(unsafe { (*pinata_account_id).data });
+    let winner_id = AccountId::new(unsafe { (*winner_account_id).data });
+    let solution = u128::from_le_bytes(unsafe { *solution });
+
+    let pinata = Pinata(&wallet);
+
+    match block_on(pinata.claim_private_owned_account(pinata_id, winner_id, solution)) {
+        Ok(Ok((response, _shared_key))) => {
+            let tx_hash = CString::new(response.tx_hash.to_string())
+                .map(|s| s.into_raw())
+                .unwrap_or(ptr::null_mut());
+
+            unsafe {
+                (*out_result).tx_hash = tx_hash;
+                (*out_result).success = true;
+            }
+            WalletFfiError::Success
+        }
+        Ok(Err(e)) => {
+            print_error(format!(
+                "Pinata private claim (not initialized) failed: {:?}",
+                e
+            ));
+            unsafe {
+                (*out_result).tx_hash = ptr::null_mut();
+                (*out_result).success = false;
+            }
+            map_execution_error(e)
+        }
+        Err(e) => e,
+    }
+}
+
+fn map_execution_error(e: ExecutionFailureKind) -> WalletFfiError {
+    match e {
+        ExecutionFailureKind::InsufficientFundsError => WalletFfiError::InsufficientFunds,
+        ExecutionFailureKind::KeyNotFoundError => WalletFfiError::KeyNotFound,
+        ExecutionFailureKind::SequencerError => WalletFfiError::NetworkError,
+        ExecutionFailureKind::SequencerClientError(_) => WalletFfiError::NetworkError,
+        _ => WalletFfiError::InternalError,
+    }
+}
diff --git a/wallet-ffi/wallet_ffi.h b/wallet-ffi/wallet_ffi.h
index 55f37cff..6b191506 100644
--- a/wallet-ffi/wallet_ffi.h
+++ b/wallet-ffi/wallet_ffi.h
@@ -475,6 +475,112 @@ char *wallet_ffi_account_id_to_base58(const struct FfiBytes32 *account_id);
 enum WalletFfiError wallet_ffi_account_id_from_base58(const char *base58_str,
                                                       struct FfiBytes32 *out_account_id);
 
+/**
+ * Claim a pinata reward using a public transaction.
+ *
+ * Sends a public claim transaction to the pinata program.
+ *
+ * # Parameters
+ * - `handle`: Valid wallet handle
+ * - `pinata_account_id`: The pinata program account ID
+ * - `winner_account_id`: The recipient account ID
+ * - `solution`: The solution value as little-endian [u8; 16]
+ * - `out_result`: Output pointer for the transaction result
+ *
+ * # Returns
+ * - `Success` if the claim transaction was submitted successfully
+ * - Error code on failure
+ *
+ * # Memory
+ * The result must be freed with `wallet_ffi_free_transfer_result()`.
+ *
+ * # Safety
+ * - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+ * - `pinata_account_id` must be a valid pointer to a `FfiBytes32` struct
+ * - `winner_account_id` must be a valid pointer to a `FfiBytes32` struct
+ * - `solution` must be a valid pointer to a `[u8; 16]` array
+ * - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+ */
+enum WalletFfiError wallet_ffi_claim_pinata(struct WalletHandle *handle,
+                                            const struct FfiBytes32 *pinata_account_id,
+                                            const struct FfiBytes32 *winner_account_id,
+                                            const uint8_t (*solution)[16],
+                                            struct FfiTransferResult *out_result);
+
+/**
+ * Claim a pinata reward using a private transaction for an already-initialized owned account.
+ *
+ * Sends a privacy-preserving claim transaction for a winner account that already has
+ * an on-chain commitment (i.e. was previously initialized).
+ *
+ * # Parameters
+ * - `handle`: Valid wallet handle
+ * - `pinata_account_id`: The pinata program account ID
+ * - `winner_account_id`: The recipient private account ID (must be owned by this wallet)
+ * - `solution`: The solution value as little-endian [u8; 16]
+ * - `winner_proof_index`: Leaf index in the commitment tree for the membership proof
+ * - `winner_proof_siblings`: Pointer to an array of 32-byte sibling hashes
+ * - `winner_proof_siblings_len`: Number of sibling hashes in the array
+ * - `out_result`: Output pointer for the transaction result
+ *
+ * # Returns
+ * - `Success` if the claim transaction was submitted successfully
+ * - Error code on failure
+ *
+ * # Memory
+ * The result must be freed with `wallet_ffi_free_transfer_result()`.
+ *
+ * # Safety
+ * - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+ * - `pinata_account_id` must be a valid pointer to a `FfiBytes32` struct
+ * - `winner_account_id` must be a valid pointer to a `FfiBytes32` struct
+ * - `solution` must be a valid pointer to a `[u8; 16]` array
+ * - `winner_proof_siblings` must be a valid pointer to an array of `winner_proof_siblings_len`
+ *   elements of `[u8; 32]`, or null if `winner_proof_siblings_len` is 0
+ * - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+ */
+enum WalletFfiError wallet_ffi_claim_pinata_private_owned_already_initialized(struct WalletHandle *handle,
+                                                                              const struct FfiBytes32 *pinata_account_id,
+                                                                              const struct FfiBytes32 *winner_account_id,
+                                                                              const uint8_t (*solution)[16],
+                                                                              uintptr_t winner_proof_index,
+                                                                              const uint8_t (*winner_proof_siblings)[32],
+                                                                              uintptr_t winner_proof_siblings_len,
+                                                                              struct FfiTransferResult *out_result);
+
+/**
+ * Claim a pinata reward using a private transaction for a not-yet-initialized owned account.
+ *
+ * Sends a privacy-preserving claim transaction for a winner account that has not yet
+ * been committed on-chain (i.e. is being initialized as part of this claim).
+ *
+ * # Parameters
+ * - `handle`: Valid wallet handle
+ * - `pinata_account_id`: The pinata program account ID
+ * - `winner_account_id`: The recipient private account ID (must be owned by this wallet)
+ * - `solution`: The solution value as little-endian [u8; 16]
+ * - `out_result`: Output pointer for the transaction result
+ *
+ * # Returns
+ * - `Success` if the claim transaction was submitted successfully
+ * - Error code on failure
+ *
+ * # Memory
+ * The result must be freed with `wallet_ffi_free_transfer_result()`.
+ *
+ * # Safety
+ * - `handle` must be a valid wallet handle from `wallet_ffi_create_new` or `wallet_ffi_open`
+ * - `pinata_account_id` must be a valid pointer to a `FfiBytes32` struct
+ * - `winner_account_id` must be a valid pointer to a `FfiBytes32` struct
+ * - `solution` must be a valid pointer to a `[u8; 16]` array
+ * - `out_result` must be a valid pointer to a `FfiTransferResult` struct
+ */
+enum WalletFfiError wallet_ffi_claim_pinata_private_owned_not_initialized(struct WalletHandle *handle,
+                                                                          const struct FfiBytes32 *pinata_account_id,
+                                                                          const struct FfiBytes32 *winner_account_id,
+                                                                          const uint8_t (*solution)[16],
+                                                                          struct FfiTransferResult *out_result);
+
 /**
  * Synchronize private accounts to a specific block.
  *
diff --git a/wallet/src/pinata_interactions.rs b/wallet/src/pinata_interactions.rs
index e588f400..abcfcf6a 100644
--- a/wallet/src/pinata_interactions.rs
+++ b/wallet/src/pinata_interactions.rs
@@ -126,7 +126,7 @@ impl WalletCore {
             &produce_random_nonces(1),
             &[(winner_npk.clone(), shared_secret_winner.clone())],
             &[],
-            &[]
+            &[],
             &program.into(),
         )
         .unwrap();
diff --git a/wallet/src/program_facades/pinata.rs b/wallet/src/program_facades/pinata.rs
index 6036a603..68891ff5 100644
--- a/wallet/src/program_facades/pinata.rs
+++ b/wallet/src/program_facades/pinata.rs
@@ -1,6 +1,6 @@
 use common::{error::ExecutionFailureKind, rpc_primitives::requests::SendTxResponse};
 use nssa::AccountId;
-use nssa_core::SharedSecretKey;
+use nssa_core::{MembershipProof, SharedSecretKey};
 
 use crate::{PrivacyPreservingAccount, WalletCore};
 
@@ -25,6 +25,22 @@ impl Pinata<'_> {
         Ok(self.0.sequencer_client.send_tx_public(tx).await?)
     }
 
+    /// Claim a pinata reward using a privacy-preserving transaction for an already-initialized
+    /// owned private account.
+    ///
+    /// The `winner_proof` parameter is accepted for API completeness; the wallet currently fetches
+    /// the membership proof automatically from the chain.
+    pub async fn claim_private_owned_account_already_initialized(
+        &self,
+        pinata_account_id: AccountId,
+        winner_account_id: AccountId,
+        solution: u128,
+        _winner_proof: MembershipProof,
+    ) -> Result<(SendTxResponse, SharedSecretKey), ExecutionFailureKind> {
+        self.claim_private_owned_account(pinata_account_id, winner_account_id, solution)
+            .await
+    }
+
     pub async fn claim_private_owned_account(
         &self,
         pinata_account_id: AccountId,