diff --git a/bindings/ergo-lib-c-core/src/ext_secret_key.rs b/bindings/ergo-lib-c-core/src/ext_secret_key.rs
index eeb431d15..7fadb5a9f 100644
--- a/bindings/ergo-lib-c-core/src/ext_secret_key.rs
+++ b/bindings/ergo-lib-c-core/src/ext_secret_key.rs
@@ -2,37 +2,41 @@
 
 use std::convert::TryInto;
 
-use crate::util::const_ptr_as_ref;
-use crate::{util::mut_ptr_as_mut, Error};
 use derive_more::{From, Into};
-use ergo_lib::wallet::derivation_path::{ChildIndex, DerivationPath};
+
+use ergo_lib::wallet::derivation_path::ChildIndex;
 use ergo_lib::wallet::ext_secret_key::{
     ChainCode, ExtSecretKey as InnerExtSecretKey, SecretKeyBytes,
 };
 use ergo_lib::wallet::mnemonic::MnemonicSeed;
 use ergo_lib::ArrLength;
 
+use crate::derivation_path::{ConstDerivationPathPtr, DerivationPath, DerivationPathPtr};
+use crate::ext_pub_key::{ExtPubKey, ExtPubKeyPtr};
+use crate::secret_key::{SecretKey, SecretKeyPtr};
+use crate::util::const_ptr_as_ref;
+use crate::{util::mut_ptr_as_mut, Error};
+
 #[derive(From, Into)]
 pub struct ExtSecretKey(InnerExtSecretKey);
 pub type ExtSecretKeyPtr = *mut ExtSecretKey;
 pub type ConstExtSecretKeyPtr = *const ExtSecretKey;
 
 /// Create ExtSecretKey from secret key bytes, chain code and derivation path
-/// Derivation path should be a string in the form of: m/44/429/acc'/0/addr
 pub unsafe fn ext_secret_key_new(
     secret_key_bytes: *const u8,
     chain_code: *const u8,
-    derivation_path: &str,
+    derivation_path_ptr: ConstDerivationPathPtr,
     ext_secret_key_out: *mut ExtSecretKeyPtr,
 ) -> Result<(), Error> {
     let ext_secret_key_out = mut_ptr_as_mut(ext_secret_key_out, "ext_secret_key_out")?;
-    let derivation_path: DerivationPath = derivation_path.parse().map_err(Error::misc)?;
+    let derivation_path = const_ptr_as_ref(derivation_path_ptr, "derivation_path_ptr")?;
     let secret_key_bytes = std::slice::from_raw_parts(secret_key_bytes, SecretKeyBytes::LEN);
     let chain_code = std::slice::from_raw_parts(chain_code, ChainCode::LEN);
     let key = InnerExtSecretKey::new(
         secret_key_bytes.try_into().map_err(Error::misc)?,
         chain_code.try_into().map_err(Error::misc)?,
-        derivation_path,
+        derivation_path.0.clone(),
     )
     .map_err(Error::misc)?;
     *ext_secret_key_out = Box::into_raw(Box::new(ExtSecretKey(key)));
@@ -67,3 +71,55 @@ pub unsafe fn ext_secret_key_child(
     *ext_secret_key_out = Box::into_raw(Box::new(ExtSecretKey(key)));
     Ok(())
 }
+
+/// Get derivation path for extended secret key
+pub unsafe fn ext_secret_key_path(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    derivation_path_out: *mut DerivationPathPtr,
+) -> Result<(), Error> {
+    let ext_secret_key = const_ptr_as_ref(ext_secret_key_ptr, "ext_secret_key_ptr")?;
+    let derivation_path_out = mut_ptr_as_mut(derivation_path_out, "derivation_path_out")?;
+    *derivation_path_out = Box::into_raw(Box::new(DerivationPath(ext_secret_key.0.path())));
+    Ok(())
+}
+
+/// Get secret key for extended secret key
+pub unsafe fn ext_secret_key_get_secret_key(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    secret_key_out: *mut SecretKeyPtr,
+) -> Result<(), Error> {
+    let ext_secret_key = const_ptr_as_ref(ext_secret_key_ptr, "ext_secret_key_ptr")?;
+    let secret_key_out = mut_ptr_as_mut(secret_key_out, "secret_key_out")?;
+    *secret_key_out = Box::into_raw(Box::new(SecretKey(ext_secret_key.0.secret_key())));
+    Ok(())
+}
+
+/// The extended public key associated with this secret key
+pub unsafe fn ext_secret_key_public_key(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    ext_pub_key_out: *mut ExtPubKeyPtr,
+) -> Result<(), Error> {
+    let ext_secret_key = const_ptr_as_ref(ext_secret_key_ptr, "ext_secret_key_ptr")?;
+    let ext_pub_key_out = mut_ptr_as_mut(ext_pub_key_out, "ext_pub_key_out")?;
+    let ext_pub_key = ExtPubKey(ext_secret_key.0.public_key().map_err(Error::misc)?);
+    *ext_pub_key_out = Box::into_raw(Box::new(ext_pub_key));
+    Ok(())
+}
+
+/// Derive a new extended secret key from the derivation path
+pub unsafe fn ext_secret_key_derive(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    derivation_path_ptr: ConstDerivationPathPtr,
+    ext_secret_key_out: *mut ExtSecretKeyPtr,
+) -> Result<(), Error> {
+    let ext_secret_key = const_ptr_as_ref(ext_secret_key_ptr, "ext_secret_key_ptr")?;
+    let derivation_path = const_ptr_as_ref(derivation_path_ptr, "derivation_path_ptr")?;
+    let ext_secret_key_out = mut_ptr_as_mut(ext_secret_key_out, "ext_secret_key_out")?;
+    *ext_secret_key_out = Box::into_raw(Box::new(ExtSecretKey(
+        ext_secret_key
+            .0
+            .derive(derivation_path.0.clone())
+            .map_err(Error::misc)?,
+    )));
+    Ok(())
+}
diff --git a/bindings/ergo-lib-c/src/ext_secret_key.rs b/bindings/ergo-lib-c/src/ext_secret_key.rs
index a79833774..43b2edf22 100644
--- a/bindings/ergo-lib-c/src/ext_secret_key.rs
+++ b/bindings/ergo-lib-c/src/ext_secret_key.rs
@@ -2,7 +2,14 @@
 
 use std::{ffi::CStr, os::raw::c_char};
 
+use ergo_lib_c_core::derivation_path::{ConstDerivationPathPtr, DerivationPathPtr};
+use ergo_lib_c_core::ext_secret_key::{
+    ext_secret_key_derive, ext_secret_key_get_secret_key, ext_secret_key_path,
+    ext_secret_key_public_key,
+};
+use ergo_lib_c_core::secret_key::SecretKeyPtr;
 use ergo_lib_c_core::{
+    ext_pub_key::ExtPubKeyPtr,
     ext_secret_key::{
         ext_secret_key_child, ext_secret_key_derive_master, ext_secret_key_new,
         ConstExtSecretKeyPtr, ExtSecretKeyPtr,
@@ -13,19 +20,17 @@ use ergo_lib_c_core::{
 use crate::{delete_ptr, ErrorPtr};
 
 /// Create ExtSecretKey from secret key bytes, chain code and derivation path
-/// Derivation path should be a string in the form of: m/44/429/acc'/0/addr
 #[no_mangle]
 pub unsafe extern "C" fn ergo_lib_ext_secret_key_new(
     secret_key_bytes_ptr: *const u8,
     chain_code_ptr: *const u8,
-    derivation_path_str: *const c_char,
+    derivation_path_ptr: ConstDerivationPathPtr,
     ext_secret_key_out: *mut ExtSecretKeyPtr,
 ) -> ErrorPtr {
-    let derivation_path = CStr::from_ptr(derivation_path_str).to_string_lossy();
     let res = ext_secret_key_new(
         secret_key_bytes_ptr,
         chain_code_ptr,
-        &derivation_path,
+        derivation_path_ptr,
         ext_secret_key_out,
     );
     Error::c_api_from(res)
@@ -55,6 +60,47 @@ pub unsafe extern "C" fn ergo_lib_ext_secret_key_child(
     Error::c_api_from(res)
 }
 
+/// Get derivation path for extended secret key
+#[no_mangle]
+pub unsafe extern "C" fn ergo_lib_ext_secret_key_path(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    derivation_path_out: *mut DerivationPathPtr,
+) {
+    #[allow(clippy::unwrap_used)]
+    ext_secret_key_path(ext_secret_key_ptr, derivation_path_out).unwrap()
+}
+
+/// Get secret key for extended secret key
+#[no_mangle]
+pub unsafe extern "C" fn ergo_lib_ext_secret_key_get_secret_key(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    secret_key_out: *mut SecretKeyPtr,
+) {
+    #[allow(clippy::unwrap_used)]
+    ext_secret_key_get_secret_key(ext_secret_key_ptr, secret_key_out).unwrap()
+}
+
+/// The extended public key associated with this secret key
+#[no_mangle]
+pub unsafe extern "C" fn ergo_lib_ext_secret_key_public_key(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    ext_pub_key_out: *mut ExtPubKeyPtr,
+) {
+    #[allow(clippy::unwrap_used)]
+    ext_secret_key_public_key(ext_secret_key_ptr, ext_pub_key_out).unwrap()
+}
+
+/// Derive a new extended secret key from the derivation path
+#[no_mangle]
+pub unsafe extern "C" fn ergo_lib_ext_secret_key_derive(
+    ext_secret_key_ptr: ConstExtSecretKeyPtr,
+    derivation_path_ptr: ConstDerivationPathPtr,
+    ext_secret_key_out: *mut ExtSecretKeyPtr,
+) -> ErrorPtr {
+    let res = ext_secret_key_derive(ext_secret_key_ptr, derivation_path_ptr, ext_secret_key_out);
+    Error::c_api_from(res)
+}
+
 /// Drop `ExtSecretKey`
 #[no_mangle]
 pub extern "C" fn ergo_lib_ext_secret_key_delete(ptr: ExtSecretKeyPtr) {
diff --git a/rust-toolchain b/rust-toolchain
index 9cf4011bd..38ab2bd63 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.66
+1.76
\ No newline at end of file