diff --git a/src/kernel/bitcoinkernel.cpp b/src/kernel/bitcoinkernel.cpp
index 92700d162c2..8967476569d 100644
--- a/src/kernel/bitcoinkernel.cpp
+++ b/src/kernel/bitcoinkernel.cpp
@@ -715,6 +715,12 @@ const btck_WitnessStack* btck_transaction_input_get_witness_stack(const btck_Tra
     return btck_WitnessStack::ref(&btck_TransactionInput::get(input).scriptWitness);
 }
 
+int btck_transaction_input_get_script_sig(const btck_TransactionInput* input, btck_WriteBytes writer, void* user_data)
+{
+    const auto& script_sig{btck_TransactionInput::get(input).scriptSig};
+    return writer(script_sig.data(), script_sig.size(), user_data);
+}
+
 void btck_transaction_input_destroy(btck_TransactionInput* input)
 {
     delete input;
diff --git a/src/kernel/bitcoinkernel.h b/src/kernel/bitcoinkernel.h
index 09b1caf08b9..b22281653b6 100644
--- a/src/kernel/bitcoinkernel.h
+++ b/src/kernel/bitcoinkernel.h
@@ -1697,6 +1697,20 @@ BITCOINKERNEL_API uint32_t btck_transaction_input_get_sequence(
 BITCOINKERNEL_API const btck_WitnessStack* btck_transaction_input_get_witness_stack(
     const btck_TransactionInput* transaction_input) BITCOINKERNEL_ARG_NONNULL(1);
 
+/**
+ * @brief Serialize the script sig of a transaction input through the passed
+ * in callback.
+ *
+ * @param[in] transaction_input Non-null.
+ * @param[in] writer            Non-null, function pointer for writing bytes.
+ * @param[in] user_data         Nullable, passed back through the writer callback.
+ * @return                      The return value of the writer.
+ */
+BITCOINKERNEL_API int BITCOINKERNEL_WARN_UNUSED_RESULT btck_transaction_input_get_script_sig(
+    const btck_TransactionInput* transaction_input,
+    btck_WriteBytes writer,
+    void* user_data) BITCOINKERNEL_ARG_NONNULL(1, 2);
+
 /**
  * Destroy the transaction input.
  */
diff --git a/src/kernel/bitcoinkernel_wrapper.h b/src/kernel/bitcoinkernel_wrapper.h
index f84a06edd2d..b5bee731c56 100644
--- a/src/kernel/bitcoinkernel_wrapper.h
+++ b/src/kernel/bitcoinkernel_wrapper.h
@@ -635,6 +635,10 @@ public:
         return WitnessStackView{btck_transaction_input_get_witness_stack(impl())};
     }
 
+    std::vector<std::byte> GetScriptSig() const
+    {
+        return write_bytes(impl(), btck_transaction_input_get_script_sig);
+    }
 };
 
 class TransactionInputView : public View<btck_TransactionInput>, public TransactionInputApi<TransactionInputView>
diff --git a/src/test/kernel/test_kernel.cpp b/src/test/kernel/test_kernel.cpp
index 8dc63fd606b..f156dc974b2 100644
--- a/src/test/kernel/test_kernel.cpp
+++ b/src/test/kernel/test_kernel.cpp
@@ -518,6 +518,10 @@ BOOST_AUTO_TEST_CASE(btck_transaction_input)
     BOOST_CHECK_EQUAL(ws_0.CountItems(), 0);
     BOOST_CHECK(ws_0.Items().empty());
 
+    // P2PKH: DER sig + compressed pubkey push.
+    BOOST_CHECK(input_0.GetScriptSig() == hex_string_to_byte_vec("473044022004893432347f39beaa280e99da595681ddb20fc45010176897e6e055d716dbfa022040a9e46648a5d10c33ef7cee5e6cf4b56bd513eae3ae044f0039824b02d0f44c012102982331a52822fd9b62e9b5d120da1d248558fac3da3a3c51cd7d9c8ad3da760e"));
+    BOOST_CHECK(input_1.GetScriptSig() == hex_string_to_byte_vec("473044022068bcedc7fe39c9f21ad318df2c2da62c2dc9522a89c28c8420ff9d03d2e6bf7b0220132afd752754e5cb1ea2fd0ed6a38ec666781e34b0e93dc9a08f2457842cf5660121033aeb9c079ea3e08ea03556182ab520ce5c22e6b0cb95cee6435ee17144d860cd"));
+
     // P2WSH input: OP_0, sig, sig, redeem_script (0, 71, 71, 105 bytes); no scriptSig.
     Transaction segwit_tx{hex_string_to_byte_vec("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")};
     TransactionInputView segwit_input = segwit_tx.GetInput(0);
@@ -535,6 +539,7 @@ BOOST_AUTO_TEST_CASE(btck_transaction_input)
     WitnessStack owned_ws_0{ws_0};
     WitnessStack owned_ws{ws};
     CheckHandle(owned_ws_0, owned_ws);
+    BOOST_CHECK(segwit_input.GetScriptSig().empty());
 }
 
 BOOST_AUTO_TEST_CASE(btck_precomputed_txdata) {