From b3324182f73e71e6771dacb57e0f32e8b025ce86 Mon Sep 17 00:00:00 2001
From: foefl <f.foerster@d-opt.com>
Date: Mon, 15 Dec 2025 10:46:21 +0100
Subject: [PATCH] working serialization

---
 setup.py                                      |   25 +-
 src/polluck_blockchain/openssl_evp.pxd        |   15 +
 src/polluck_blockchain/placeholder_native.cpp | 1671 +++++++++++------
 src/polluck_blockchain/placeholder_native.pyx |   79 +-
 4 files changed, 1225 insertions(+), 565 deletions(-)
 create mode 100644 src/polluck_blockchain/openssl_evp.pxd

diff --git a/setup.py b/setup.py
index c7c074c..2d17f78 100644
--- a/setup.py
+++ b/setup.py
@@ -1,25 +1,44 @@
 import os
 import sys
+from pathlib import Path
 
 from Cython.Build import cythonize
 from Cython.Compiler import Options
-from setuptools import setup
+from setuptools import Extension, setup
 
+# Cython compilation options
 Options.docstrings = False
 Options.embed_pos_in_docstring = False
 Options.annotate = False
 Options.fast_fail = True
 
 DEBUG = bool(os.getenv("DOPT_DEBUG", None))
-
 linetrace_opt: bool = False
 if DEBUG:
     linetrace_opt = True
 
+# includes
+OPENSSL_DIR = (Path(__file__).parent / "openssl").resolve()
+assert OPENSSL_DIR.exists()
+openssl_include = OPENSSL_DIR / "include"
+assert openssl_include.exists()
+openssl_lib = OPENSSL_DIR / "lib"
+assert openssl_lib.exists()
+
+ext = Extension(
+    name="polluck_blockchain.placeholder_native",
+    sources=["src/polluck_blockchain/placeholder_native.pyx"],
+    include_dirs=[str(openssl_include)],
+    library_dirs=[str(openssl_lib)],
+    libraries=["libssl", "libcrypto"],
+)
+
+
 ext_modules = cythonize(
     [
+        ext,
         # "src/polluck_blockchain/placeholder.py",
-        "src/polluck_blockchain/placeholder_native.pyx",
+        # "src/polluck_blockchain/placeholder_native.pyx",
         # "src/polluck_blockchain/python_translate.py",
     ],
     compiler_directives={
diff --git a/src/polluck_blockchain/openssl_evp.pxd b/src/polluck_blockchain/openssl_evp.pxd
new file mode 100644
index 0000000..ca4016c
--- /dev/null
+++ b/src/polluck_blockchain/openssl_evp.pxd
@@ -0,0 +1,15 @@
+
+cdef extern from "openssl/evp.h":
+    ctypedef struct EVP_MD_CTX:
+        pass
+    ctypedef struct EVP_MD:
+        pass
+    EVP_MD_CTX *EVP_MD_CTX_new()
+    void EVP_MD_CTX_free(EVP_MD_CTX *)
+    const EVP_MD *EVP_sha256()
+    int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, void *impl)
+    int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *d, size_t cnt)
+    int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md,
+                           unsigned int *s)
+    int EVP_MD_size(const EVP_MD *md)
+    int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
diff --git a/src/polluck_blockchain/placeholder_native.cpp b/src/polluck_blockchain/placeholder_native.cpp
index adce004..6e0e66c 100644
--- a/src/polluck_blockchain/placeholder_native.cpp
+++ b/src/polluck_blockchain/placeholder_native.cpp
@@ -1,15 +1,24 @@
-/* Generated by Cython 3.2.2 */
+/* Generated by Cython 3.2.3 */
 
 /* BEGIN: Cython Metadata
 {
     "distutils": {
         "depends": [
+            "A:\\Arbeitsaufgaben\\Polluck-projects\\blockchain\\openssl\\include\\openssl\\evp.h",
             "src\\polluck_blockchain\\block.hpp"
         ],
         "include_dirs": [
-            "src\\polluck_blockchain"
+            "src\\polluck_blockchain",
+            "A:\\Arbeitsaufgaben\\Polluck-projects\\blockchain\\openssl\\include"
         ],
         "language": "c++",
+        "libraries": [
+            "libssl",
+            "libcrypto"
+        ],
+        "library_dirs": [
+            "A:\\Arbeitsaufgaben\\Polluck-projects\\blockchain\\openssl\\lib"
+        ],
         "name": "polluck_blockchain.placeholder_native",
         "sources": [
             "src/polluck_blockchain/placeholder_native.pyx"
@@ -41,8 +50,8 @@ END: Cython Metadata */
 #elif PY_VERSION_HEX < 0x03080000
     #error Cython requires Python 3.8+.
 #else
-#define __PYX_ABI_VERSION "3_2_2"
-#define CYTHON_HEX_VERSION 0x030202F0
+#define __PYX_ABI_VERSION "3_2_3"
+#define CYTHON_HEX_VERSION 0x030203F0
 #define CYTHON_FUTURE_DIVISION 1
 /* CModulePreamble */
 #include <stddef.h>
@@ -1172,6 +1181,7 @@ static int __Pyx_init_co_variables(void) {
     
 #include <unordered_map>
 #include <stdlib.h>
+#include "openssl/evp.h"
 #ifdef _OPENMP
 #include <omp.h>
 #endif /* _OPENMP */
@@ -1180,6 +1190,15 @@ static int __Pyx_init_co_variables(void) {
 #define CYTHON_WITHOUT_ASSERTIONS
 #endif
 
+#ifdef CYTHON_FREETHREADING_COMPATIBLE
+#if CYTHON_FREETHREADING_COMPATIBLE
+#define __Pyx_FREETHREADING_COMPATIBLE Py_MOD_GIL_NOT_USED
+#else
+#define __Pyx_FREETHREADING_COMPATIBLE Py_MOD_GIL_USED
+#endif
+#else
+#define __Pyx_FREETHREADING_COMPATIBLE Py_MOD_GIL_USED
+#endif
 #define __PYX_DEFAULT_STRING_ENCODING_IS_ASCII 0
 #define __PYX_DEFAULT_STRING_ENCODING_IS_UTF8 0
 #define __PYX_DEFAULT_STRING_ENCODING ""
@@ -1554,7 +1573,7 @@ static const char* const __pyx_f[] = {
 
 /* #### Code section: numeric_typedefs ### */
 
-/* "polluck_blockchain/placeholder_native.pyx":25
+/* "polluck_blockchain/placeholder_native.pyx":26
  * 
  * 
  * ctypedef unsigned long ULong             # <<<<<<<<<<<<<<
@@ -1568,10 +1587,9 @@ typedef unsigned long __pyx_t_18polluck_blockchain_18placeholder_native_ULong;
 /*--- Type declarations ---*/
 struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock;
 struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain;
-struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult;
 struct __pyx_opt_args_18polluck_blockchain_18placeholder_native_7PyBlock_from_ptr;
 
-/* "polluck_blockchain/placeholder_native.pyx":26
+/* "polluck_blockchain/placeholder_native.pyx":27
  * 
  * ctypedef unsigned long ULong
  * ctypedef unordered_map[uint64_t, Block*] BcHashmap             # <<<<<<<<<<<<<<
@@ -1580,19 +1598,7 @@ struct __pyx_opt_args_18polluck_blockchain_18placeholder_native_7PyBlock_from_pt
 */
 typedef std::unordered_map<uint64_t,::Block *>  __pyx_t_18polluck_blockchain_18placeholder_native_BcHashmap;
 
-/* "polluck_blockchain/placeholder_native.pyx":51
- *     out[7] = v & 0xFF
- * 
- * cdef struct SerializeResult:             # <<<<<<<<<<<<<<
- *     unsigned char *ptr
- *     size_t size
-*/
-struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult {
-  unsigned char *ptr;
-  size_t size;
-};
-
-/* "polluck_blockchain/placeholder_native.pyx":97
+/* "polluck_blockchain/placeholder_native.pyx":102
  * 
  *     @staticmethod
  *     cdef PyBlock from_ptr(Block *block, bint owner=False):             # <<<<<<<<<<<<<<
@@ -1604,8 +1610,8 @@ struct __pyx_opt_args_18polluck_blockchain_18placeholder_native_7PyBlock_from_pt
   int owner;
 };
 
-/* "polluck_blockchain/placeholder_native.pyx":55
- *     size_t size
+/* "polluck_blockchain/placeholder_native.pyx":60
+ * #     size_t size
  * 
  * cdef class PyBlock:             # <<<<<<<<<<<<<<
  *     cdef:
@@ -1619,7 +1625,7 @@ struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock {
 };
 
 
-/* "polluck_blockchain/placeholder_native.pyx":225
+/* "polluck_blockchain/placeholder_native.pyx":279
  * 
  * 
  * cdef class Blockchain:             # <<<<<<<<<<<<<<
@@ -1637,8 +1643,8 @@ struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain {
 
 
 
-/* "polluck_blockchain/placeholder_native.pyx":55
- *     size_t size
+/* "polluck_blockchain/placeholder_native.pyx":60
+ * #     size_t size
  * 
  * cdef class PyBlock:             # <<<<<<<<<<<<<<
  *     cdef:
@@ -1647,12 +1653,15 @@ struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain {
 
 struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_PyBlock {
   struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *(*from_ptr)(::Block *, struct __pyx_opt_args_18polluck_blockchain_18placeholder_native_7PyBlock_from_ptr *__pyx_optional_args);
-  struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult (*bytes_serialize_c)(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *);
+  unsigned char *(*bytes_serialize_c)(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *, size_t *);
+  unsigned char *(*digest)(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *, unsigned char *, size_t, size_t *);
+  unsigned char *(*perform_hash_c)(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *, size_t *);
+  PyObject *(*perform_hash)(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *, int __pyx_skip_dispatch);
 };
 static struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_vtabptr_18polluck_blockchain_18placeholder_native_PyBlock;
 
 
-/* "polluck_blockchain/placeholder_native.pyx":225
+/* "polluck_blockchain/placeholder_native.pyx":279
  * 
  * 
  * cdef class Blockchain:             # <<<<<<<<<<<<<<
@@ -2143,6 +2152,14 @@ static CYTHON_INLINE void __Pyx__ExceptionReset(PyThreadState *tstate, PyObject
 #define __Pyx_ExceptionReset(type, value, tb)  PyErr_SetExcInfo(type, value, tb)
 #endif
 
+/* MoveIfSupported.proto */
+#if CYTHON_USE_CPP_STD_MOVE
+  #include <utility>
+  #define __PYX_STD_MOVE_IF_SUPPORTED(x) std::move(x)
+#else
+  #define __PYX_STD_MOVE_IF_SUPPORTED(x) x
+#endif
+
 /* PyTypeError_Check.proto */
 #define __Pyx_PyExc_TypeError_Check(obj)  __Pyx_TypeCheck(obj, PyExc_TypeError)
 
@@ -2155,14 +2172,6 @@ static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject
 /* PyIndexError_Check.proto */
 #define __Pyx_PyExc_IndexError_Check(obj)  __Pyx_TypeCheck(obj, PyExc_IndexError)
 
-/* MoveIfSupported.proto */
-#if CYTHON_USE_CPP_STD_MOVE
-  #include <utility>
-  #define __PYX_STD_MOVE_IF_SUPPORTED(x) std::move(x)
-#else
-  #define __PYX_STD_MOVE_IF_SUPPORTED(x) x
-#endif
-
 /* PyRuntimeError_Check.proto */
 #define __Pyx_PyExc_RuntimeError_Check(obj)  __Pyx_TypeCheck(obj, PyExc_RuntimeError)
 
@@ -2579,7 +2588,10 @@ static int __Pyx_State_RemoveModule(void*);
 #define __PYX_TYPE_MODULE_PREFIX __PYX_ABI_MODULE_NAME "."
 
 static struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_from_ptr(::Block *__pyx_v_block, struct __pyx_opt_args_18polluck_blockchain_18placeholder_native_7PyBlock_from_ptr *__pyx_optional_args); /* proto*/
-static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult __pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_bytes_serialize_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto*/
+static unsigned char *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_bytes_serialize_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, size_t *__pyx_v_size); /* proto*/
+static unsigned char *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_digest(CYTHON_UNUSED struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, unsigned char *__pyx_v_data, size_t __pyx_v_data_size, size_t *__pyx_v_digest_size); /* proto*/
+static unsigned char *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_perform_hash_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, size_t *__pyx_v_digest_size); /* proto*/
+static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_perform_hash(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, int __pyx_skip_dispatch); /* proto*/
 static ::Block *__pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_get_block_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self, uint64_t __pyx_v_idx); /* proto*/
 static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_block(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self, ::Block *__pyx_v_block); /* proto*/
 
@@ -2603,6 +2615,8 @@ static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_b
 
 /* Module declarations from "libc.stdlib" */
 
+/* Module declarations from "polluck_blockchain.openssl_evp" */
+
 /* Module declarations from "polluck_blockchain.placeholder_native" */
 static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_timestamp_to_datetime(uint64_t); /*proto*/
 static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(unsigned char *, unsigned PY_LONG_LONG); /*proto*/
@@ -2634,8 +2648,9 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_9pr
 static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_5nonce___get__(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4hash___get__(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_10bytes_serialize(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_12__reduce_cython__(CYTHON_UNUSED struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_14__setstate_cython__(CYTHON_UNUSED struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, CYTHON_UNUSED PyObject *__pyx_v___pyx_state); /* proto */
+static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_12perform_hash(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_14__reduce_cython__(CYTHON_UNUSED struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_16__setstate_cython__(CYTHON_UNUSED struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, CYTHON_UNUSED PyObject *__pyx_v___pyx_state); /* proto */
 static int __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain___cinit__(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self); /* proto */
 static int __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain_2__init__(CYTHON_UNUSED struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self, CYTHON_UNUSED PyObject *__pyx_v_args, CYTHON_UNUSED PyObject *__pyx_v_kwargs); /* proto */
 static void __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain_4__dealloc__(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self); /* proto */
@@ -2678,8 +2693,8 @@ typedef struct {
   __Pyx_CachedCFunction __pyx_umethod_PyDict_Type_pop;
   __Pyx_CachedCFunction __pyx_umethod_PyDict_Type_values;
   PyObject *__pyx_tuple[1];
-  PyObject *__pyx_codeobj_tab[9];
-  PyObject *__pyx_string_tab[92];
+  PyObject *__pyx_codeobj_tab[10];
+  PyObject *__pyx_string_tab[96];
   PyObject *__pyx_number_tab[4];
 /* #### Code section: module_state_contents ### */
 /* CommonTypesMetaclass.module_state_decls */
@@ -2746,73 +2761,77 @@ static __pyx_mstatetype * const __pyx_mstate_global = &__pyx_mstate_global_stati
 #define __pyx_n_u_PyBlock___reduce_cython __pyx_string_tab[22]
 #define __pyx_n_u_PyBlock___setstate_cython __pyx_string_tab[23]
 #define __pyx_n_u_PyBlock_bytes_serialize __pyx_string_tab[24]
-#define __pyx_n_u_Pyx_PyDict_NextRef __pyx_string_tab[25]
-#define __pyx_n_u_TIMEZONE_UTC __pyx_string_tab[26]
-#define __pyx_n_u_asyncio_coroutines __pyx_string_tab[27]
-#define __pyx_n_u_block __pyx_string_tab[28]
-#define __pyx_n_u_bytes_serialize __pyx_string_tab[29]
-#define __pyx_n_u_cline_in_traceback __pyx_string_tab[30]
-#define __pyx_n_u_create_genesis_block __pyx_string_tab[31]
-#define __pyx_n_u_data __pyx_string_tab[32]
-#define __pyx_n_u_datetime __pyx_string_tab[33]
-#define __pyx_n_u_dopt_basics __pyx_string_tab[34]
-#define __pyx_n_u_dopt_basics_datetime __pyx_string_tab[35]
-#define __pyx_n_u_encode __pyx_string_tab[36]
-#define __pyx_n_u_from_ptr __pyx_string_tab[37]
-#define __pyx_n_u_fromtimestamp __pyx_string_tab[38]
-#define __pyx_n_u_func __pyx_string_tab[39]
-#define __pyx_n_u_get_block __pyx_string_tab[40]
-#define __pyx_n_u_getstate __pyx_string_tab[41]
-#define __pyx_n_u_hashlib __pyx_string_tab[42]
-#define __pyx_n_u_idx __pyx_string_tab[43]
-#define __pyx_n_u_index __pyx_string_tab[44]
-#define __pyx_n_u_is_coroutine __pyx_string_tab[45]
-#define __pyx_n_u_it __pyx_string_tab[46]
-#define __pyx_n_u_items __pyx_string_tab[47]
-#define __pyx_n_u_main __pyx_string_tab[48]
-#define __pyx_n_u_module __pyx_string_tab[49]
-#define __pyx_n_u_name __pyx_string_tab[50]
-#define __pyx_n_u_new_block __pyx_string_tab[51]
-#define __pyx_n_u_new_idx __pyx_string_tab[52]
-#define __pyx_n_u_nonce __pyx_string_tab[53]
-#define __pyx_n_u_polluck_blockchain_placeholder_n __pyx_string_tab[54]
-#define __pyx_n_u_pop __pyx_string_tab[55]
-#define __pyx_n_u_prev_block __pyx_string_tab[56]
-#define __pyx_n_u_prev_hash __pyx_string_tab[57]
-#define __pyx_n_u_previous_hash __pyx_string_tab[58]
-#define __pyx_n_u_print __pyx_string_tab[59]
-#define __pyx_n_u_print_key_value_pair __pyx_string_tab[60]
-#define __pyx_n_u_ptr __pyx_string_tab[61]
-#define __pyx_n_u_py_block __pyx_string_tab[62]
-#define __pyx_n_u_pyx_state __pyx_string_tab[63]
-#define __pyx_n_u_pyx_vtable __pyx_string_tab[64]
-#define __pyx_n_u_qualname __pyx_string_tab[65]
-#define __pyx_n_u_reduce __pyx_string_tab[66]
-#define __pyx_n_u_reduce_cython __pyx_string_tab[67]
-#define __pyx_n_u_reduce_ex __pyx_string_tab[68]
-#define __pyx_n_u_repr __pyx_string_tab[69]
-#define __pyx_n_u_self __pyx_string_tab[70]
-#define __pyx_n_u_serialize_res __pyx_string_tab[71]
-#define __pyx_n_u_set_name __pyx_string_tab[72]
-#define __pyx_n_u_setdefault __pyx_string_tab[73]
-#define __pyx_n_u_setstate __pyx_string_tab[74]
-#define __pyx_n_u_setstate_cython __pyx_string_tab[75]
-#define __pyx_n_u_size __pyx_string_tab[76]
-#define __pyx_n_u_struct __pyx_string_tab[77]
-#define __pyx_n_u_test __pyx_string_tab[78]
-#define __pyx_n_u_time __pyx_string_tab[79]
-#define __pyx_n_u_timestamp __pyx_string_tab[80]
-#define __pyx_n_u_values __pyx_string_tab[81]
-#define __pyx_kp_b_ __pyx_string_tab[82]
-#define __pyx_kp_b_0 __pyx_string_tab[83]
-#define __pyx_kp_b_Genesis_Block __pyx_string_tab[84]
-#define __pyx_kp_b_dummy_hash __pyx_string_tab[85]
-#define __pyx_kp_b_iso88591_A_4r_3d_D_AQ_D_AQ_iq_Q __pyx_string_tab[86]
-#define __pyx_kp_b_iso88591_A_4t1_aq_a_HBa_IQ_q_Ct3b_q_gQa_J __pyx_string_tab[87]
-#define __pyx_kp_b_iso88591_A_D_2_Bm1_a __pyx_string_tab[88]
-#define __pyx_kp_b_iso88591_A_IQ_q_Ct3b_7_1_waq_gQa_X_Jaq_Q __pyx_string_tab[89]
-#define __pyx_kp_b_iso88591_A_T_a_c_D_t1_c_L_1_iq __pyx_string_tab[90]
-#define __pyx_kp_b_iso88591_Q __pyx_string_tab[91]
+#define __pyx_n_u_PyBlock_perform_hash __pyx_string_tab[25]
+#define __pyx_n_u_Pyx_PyDict_NextRef __pyx_string_tab[26]
+#define __pyx_n_u_TIMEZONE_UTC __pyx_string_tab[27]
+#define __pyx_n_u_asyncio_coroutines __pyx_string_tab[28]
+#define __pyx_n_u_block __pyx_string_tab[29]
+#define __pyx_n_u_bytes_serialize __pyx_string_tab[30]
+#define __pyx_n_u_cline_in_traceback __pyx_string_tab[31]
+#define __pyx_n_u_create_genesis_block __pyx_string_tab[32]
+#define __pyx_n_u_data __pyx_string_tab[33]
+#define __pyx_n_u_datetime __pyx_string_tab[34]
+#define __pyx_n_u_dopt_basics __pyx_string_tab[35]
+#define __pyx_n_u_dopt_basics_datetime __pyx_string_tab[36]
+#define __pyx_n_u_encode __pyx_string_tab[37]
+#define __pyx_n_u_from_ptr __pyx_string_tab[38]
+#define __pyx_n_u_fromtimestamp __pyx_string_tab[39]
+#define __pyx_n_u_func __pyx_string_tab[40]
+#define __pyx_n_u_get_block __pyx_string_tab[41]
+#define __pyx_n_u_getstate __pyx_string_tab[42]
+#define __pyx_n_u_hash __pyx_string_tab[43]
+#define __pyx_n_u_hashlib __pyx_string_tab[44]
+#define __pyx_n_u_hex __pyx_string_tab[45]
+#define __pyx_n_u_idx __pyx_string_tab[46]
+#define __pyx_n_u_index __pyx_string_tab[47]
+#define __pyx_n_u_is_coroutine __pyx_string_tab[48]
+#define __pyx_n_u_it __pyx_string_tab[49]
+#define __pyx_n_u_items __pyx_string_tab[50]
+#define __pyx_n_u_main __pyx_string_tab[51]
+#define __pyx_n_u_module __pyx_string_tab[52]
+#define __pyx_n_u_name __pyx_string_tab[53]
+#define __pyx_n_u_new_block __pyx_string_tab[54]
+#define __pyx_n_u_new_idx __pyx_string_tab[55]
+#define __pyx_n_u_nonce __pyx_string_tab[56]
+#define __pyx_n_u_perform_hash __pyx_string_tab[57]
+#define __pyx_n_u_polluck_blockchain_placeholder_n __pyx_string_tab[58]
+#define __pyx_n_u_pop __pyx_string_tab[59]
+#define __pyx_n_u_prev_block __pyx_string_tab[60]
+#define __pyx_n_u_prev_hash __pyx_string_tab[61]
+#define __pyx_n_u_previous_hash __pyx_string_tab[62]
+#define __pyx_n_u_print __pyx_string_tab[63]
+#define __pyx_n_u_print_key_value_pair __pyx_string_tab[64]
+#define __pyx_n_u_py_block __pyx_string_tab[65]
+#define __pyx_n_u_pyx_state __pyx_string_tab[66]
+#define __pyx_n_u_pyx_vtable __pyx_string_tab[67]
+#define __pyx_n_u_qualname __pyx_string_tab[68]
+#define __pyx_n_u_reduce __pyx_string_tab[69]
+#define __pyx_n_u_reduce_cython __pyx_string_tab[70]
+#define __pyx_n_u_reduce_ex __pyx_string_tab[71]
+#define __pyx_n_u_repr __pyx_string_tab[72]
+#define __pyx_n_u_self __pyx_string_tab[73]
+#define __pyx_n_u_serialize_res __pyx_string_tab[74]
+#define __pyx_n_u_serialize_size __pyx_string_tab[75]
+#define __pyx_n_u_set_name __pyx_string_tab[76]
+#define __pyx_n_u_setdefault __pyx_string_tab[77]
+#define __pyx_n_u_setstate __pyx_string_tab[78]
+#define __pyx_n_u_setstate_cython __pyx_string_tab[79]
+#define __pyx_n_u_struct __pyx_string_tab[80]
+#define __pyx_n_u_test __pyx_string_tab[81]
+#define __pyx_n_u_time __pyx_string_tab[82]
+#define __pyx_n_u_timestamp __pyx_string_tab[83]
+#define __pyx_n_u_values __pyx_string_tab[84]
+#define __pyx_kp_b_ __pyx_string_tab[85]
+#define __pyx_kp_b_0 __pyx_string_tab[86]
+#define __pyx_kp_b_Genesis_Block __pyx_string_tab[87]
+#define __pyx_kp_b_dummy_hash __pyx_string_tab[88]
+#define __pyx_kp_b_iso88591_A_4r_3d_D_AQ_D_AQ_iq_Q __pyx_string_tab[89]
+#define __pyx_kp_b_iso88591_A_4t1_aq_a_HBa_IQ_q_Ct3b_q_gQa_J __pyx_string_tab[90]
+#define __pyx_kp_b_iso88591_A_D_2_1A __pyx_string_tab[91]
+#define __pyx_kp_b_iso88591_A_IQ_q_Ct3b_7_1_waq_gQa_X_Jaq_Q __pyx_string_tab[92]
+#define __pyx_kp_b_iso88591_A_T_a_c_D_t1_c_L_1_iq __pyx_string_tab[93]
+#define __pyx_kp_b_iso88591_A_T_xuAV2_b_q_t1 __pyx_string_tab[94]
+#define __pyx_kp_b_iso88591_Q __pyx_string_tab[95]
 #define __pyx_int_0 __pyx_number_tab[0]
 #define __pyx_int_1 __pyx_number_tab[1]
 #define __pyx_int_12 __pyx_number_tab[2]
@@ -2836,8 +2855,8 @@ static CYTHON_SMALL_CODE int __pyx_m_clear(PyObject *m) {
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   Py_CLEAR(clear_module_state->__pyx_type_18polluck_blockchain_18placeholder_native_Blockchain);
   for (int i=0; i<1; ++i) { Py_CLEAR(clear_module_state->__pyx_tuple[i]); }
-  for (int i=0; i<9; ++i) { Py_CLEAR(clear_module_state->__pyx_codeobj_tab[i]); }
-  for (int i=0; i<92; ++i) { Py_CLEAR(clear_module_state->__pyx_string_tab[i]); }
+  for (int i=0; i<10; ++i) { Py_CLEAR(clear_module_state->__pyx_codeobj_tab[i]); }
+  for (int i=0; i<96; ++i) { Py_CLEAR(clear_module_state->__pyx_string_tab[i]); }
   for (int i=0; i<4; ++i) { Py_CLEAR(clear_module_state->__pyx_number_tab[i]); }
 /* #### Code section: module_state_clear_contents ### */
 /* CommonTypesMetaclass.module_state_clear */
@@ -2866,8 +2885,8 @@ static CYTHON_SMALL_CODE int __pyx_m_traverse(PyObject *m, visitproc visit, void
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-  for (int i=0; i<9; ++i) { __Pyx_VISIT_CONST(traverse_module_state->__pyx_codeobj_tab[i]); }
-  for (int i=0; i<92; ++i) { __Pyx_VISIT_CONST(traverse_module_state->__pyx_string_tab[i]); }
+  for (int i=0; i<10; ++i) { __Pyx_VISIT_CONST(traverse_module_state->__pyx_codeobj_tab[i]); }
+  for (int i=0; i<96; ++i) { __Pyx_VISIT_CONST(traverse_module_state->__pyx_string_tab[i]); }
   for (int i=0; i<4; ++i) { __Pyx_VISIT_CONST(traverse_module_state->__pyx_number_tab[i]); }
 /* #### Code section: module_state_traverse_contents ### */
 /* CommonTypesMetaclass.module_state_traverse */
@@ -3263,7 +3282,7 @@ static CYTHON_INLINE PyObject *__pyx_convert_PyByteArray_string_to_py_6libcpp_6s
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":28
+/* "polluck_blockchain/placeholder_native.pyx":29
  * ctypedef unordered_map[uint64_t, Block*] BcHashmap
  * 
  * cdef timestamp_to_datetime(uint64_t ts):             # <<<<<<<<<<<<<<
@@ -3286,7 +3305,7 @@ static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_timestamp_to_
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("timestamp_to_datetime", 0);
 
-  /* "polluck_blockchain/placeholder_native.pyx":29
+  /* "polluck_blockchain/placeholder_native.pyx":30
  * 
  * cdef timestamp_to_datetime(uint64_t ts):
  *     return datetime.datetime.fromtimestamp(float(ts), dopt_basics.datetime.TIMEZONE_UTC)             # <<<<<<<<<<<<<<
@@ -3294,21 +3313,21 @@ static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_timestamp_to_
  * 
 */
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+  __Pyx_GetModuleGlobalName(__pyx_t_3, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 30, __pyx_L1_error)
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+  __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_t_3, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 30, __pyx_L1_error)
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-  __pyx_t_3 = PyFloat_FromDouble(((double)__pyx_v_ts)); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 29, __pyx_L1_error)
+  __pyx_t_3 = PyFloat_FromDouble(((double)__pyx_v_ts)); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 30, __pyx_L1_error)
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+  __Pyx_GetModuleGlobalName(__pyx_t_5, __pyx_mstate_global->__pyx_n_u_dopt_basics); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 30, __pyx_L1_error)
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+  __pyx_t_6 = __Pyx_PyObject_GetAttrStr(__pyx_t_5, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 30, __pyx_L1_error)
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+  __pyx_t_5 = __Pyx_PyObject_GetAttrStr(__pyx_t_6, __pyx_mstate_global->__pyx_n_u_TIMEZONE_UTC); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 30, __pyx_L1_error)
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@@ -3319,14 +3338,14 @@ static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_timestamp_to_
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     __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0;
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-    if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 29, __pyx_L1_error)
+    if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 30, __pyx_L1_error)
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   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":28
+  /* "polluck_blockchain/placeholder_native.pyx":29
  * ctypedef unordered_map[uint64_t, Block*] BcHashmap
  * 
  * cdef timestamp_to_datetime(uint64_t ts):             # <<<<<<<<<<<<<<
@@ -3350,7 +3369,7 @@ static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_timestamp_to_
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":35
+/* "polluck_blockchain/placeholder_native.pyx":36
  * #     return struct.pack(">d", num)
  * 
  * cdef int serialize_uint32(unsigned char* out, unsigned int v) except -1 nogil:             # <<<<<<<<<<<<<<
@@ -3361,7 +3380,7 @@ static PyObject *__pyx_f_18polluck_blockchain_18placeholder_native_timestamp_to_
 static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(unsigned char *__pyx_v_out, unsigned int __pyx_v_v) {
   int __pyx_r;
 
-  /* "polluck_blockchain/placeholder_native.pyx":36
+  /* "polluck_blockchain/placeholder_native.pyx":37
  * 
  * cdef int serialize_uint32(unsigned char* out, unsigned int v) except -1 nogil:
  *     out[0] = (v >> 24) & 0xFF             # <<<<<<<<<<<<<<
@@ -3370,7 +3389,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(un
 */
   (__pyx_v_out[0]) = ((__pyx_v_v >> 24) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":37
+  /* "polluck_blockchain/placeholder_native.pyx":38
  * cdef int serialize_uint32(unsigned char* out, unsigned int v) except -1 nogil:
  *     out[0] = (v >> 24) & 0xFF
  *     out[1] = (v >> 16) & 0xFF             # <<<<<<<<<<<<<<
@@ -3379,7 +3398,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(un
 */
   (__pyx_v_out[1]) = ((__pyx_v_v >> 16) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":38
+  /* "polluck_blockchain/placeholder_native.pyx":39
  *     out[0] = (v >> 24) & 0xFF
  *     out[1] = (v >> 16) & 0xFF
  *     out[2] = (v >> 8)  & 0xFF             # <<<<<<<<<<<<<<
@@ -3388,7 +3407,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(un
 */
   (__pyx_v_out[2]) = ((__pyx_v_v >> 8) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":39
+  /* "polluck_blockchain/placeholder_native.pyx":40
  *     out[1] = (v >> 16) & 0xFF
  *     out[2] = (v >> 8)  & 0xFF
  *     out[3] = v & 0xFF             # <<<<<<<<<<<<<<
@@ -3397,7 +3416,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(un
 */
   (__pyx_v_out[3]) = (__pyx_v_v & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":35
+  /* "polluck_blockchain/placeholder_native.pyx":36
  * #     return struct.pack(">d", num)
  * 
  * cdef int serialize_uint32(unsigned char* out, unsigned int v) except -1 nogil:             # <<<<<<<<<<<<<<
@@ -3410,7 +3429,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(un
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":41
+/* "polluck_blockchain/placeholder_native.pyx":42
  *     out[3] = v & 0xFF
  * 
  * cdef int serialize_uint64(unsigned char* out, unsigned long long v) except -1 nogil:             # <<<<<<<<<<<<<<
@@ -3421,7 +3440,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint32(un
 static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(unsigned char *__pyx_v_out, unsigned PY_LONG_LONG __pyx_v_v) {
   int __pyx_r;
 
-  /* "polluck_blockchain/placeholder_native.pyx":42
+  /* "polluck_blockchain/placeholder_native.pyx":43
  * 
  * cdef int serialize_uint64(unsigned char* out, unsigned long long v) except -1 nogil:
  *     out[0] = (v >> 56) & 0xFF             # <<<<<<<<<<<<<<
@@ -3430,7 +3449,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[0]) = ((__pyx_v_v >> 56) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":43
+  /* "polluck_blockchain/placeholder_native.pyx":44
  * cdef int serialize_uint64(unsigned char* out, unsigned long long v) except -1 nogil:
  *     out[0] = (v >> 56) & 0xFF
  *     out[1] = (v >> 48) & 0xFF             # <<<<<<<<<<<<<<
@@ -3439,7 +3458,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[1]) = ((__pyx_v_v >> 48) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":44
+  /* "polluck_blockchain/placeholder_native.pyx":45
  *     out[0] = (v >> 56) & 0xFF
  *     out[1] = (v >> 48) & 0xFF
  *     out[2] = (v >> 40) & 0xFF             # <<<<<<<<<<<<<<
@@ -3448,7 +3467,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[2]) = ((__pyx_v_v >> 40) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":45
+  /* "polluck_blockchain/placeholder_native.pyx":46
  *     out[1] = (v >> 48) & 0xFF
  *     out[2] = (v >> 40) & 0xFF
  *     out[3] = (v >> 32) & 0xFF             # <<<<<<<<<<<<<<
@@ -3457,7 +3476,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[3]) = ((__pyx_v_v >> 32) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":46
+  /* "polluck_blockchain/placeholder_native.pyx":47
  *     out[2] = (v >> 40) & 0xFF
  *     out[3] = (v >> 32) & 0xFF
  *     out[4] = (v >> 24) & 0xFF             # <<<<<<<<<<<<<<
@@ -3466,7 +3485,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[4]) = ((__pyx_v_v >> 24) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":47
+  /* "polluck_blockchain/placeholder_native.pyx":48
  *     out[3] = (v >> 32) & 0xFF
  *     out[4] = (v >> 24) & 0xFF
  *     out[5] = (v >> 16) & 0xFF             # <<<<<<<<<<<<<<
@@ -3475,7 +3494,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[5]) = ((__pyx_v_v >> 16) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":48
+  /* "polluck_blockchain/placeholder_native.pyx":49
  *     out[4] = (v >> 24) & 0xFF
  *     out[5] = (v >> 16) & 0xFF
  *     out[6] = (v >> 8)  & 0xFF             # <<<<<<<<<<<<<<
@@ -3484,16 +3503,16 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
 */
   (__pyx_v_out[6]) = ((__pyx_v_v >> 8) & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":49
+  /* "polluck_blockchain/placeholder_native.pyx":50
  *     out[5] = (v >> 16) & 0xFF
  *     out[6] = (v >> 8)  & 0xFF
  *     out[7] = v & 0xFF             # <<<<<<<<<<<<<<
  * 
- * cdef struct SerializeResult:
+ * # cdef struct SerializeResult:
 */
   (__pyx_v_out[7]) = (__pyx_v_v & 0xFF);
 
-  /* "polluck_blockchain/placeholder_native.pyx":41
+  /* "polluck_blockchain/placeholder_native.pyx":42
  *     out[3] = v & 0xFF
  * 
  * cdef int serialize_uint64(unsigned char* out, unsigned long long v) except -1 nogil:             # <<<<<<<<<<<<<<
@@ -3506,7 +3525,7 @@ static int __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64(un
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":66
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  * 
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@@ -3540,36 +3559,36 @@ static int __pyx_pw_18polluck_blockchain_18placeholder_native_7PyBlock_1__cinit_
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     const Py_ssize_t __pyx_kwds_len = (__pyx_kwds) ? __Pyx_NumKwargs_VARARGS(__pyx_kwds) : 0;
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-    /* "polluck_blockchain/placeholder_native.pyx":77
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-    /* "polluck_blockchain/placeholder_native.pyx":78
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+    __pyx_t_10 = __Pyx_PyLong_As_uint64_t(__pyx_v_nonce); if (unlikely((__pyx_t_10 == ((uint64_t)-1)) && PyErr_Occurred())) __PYX_ERR(0, 83, __pyx_L1_error)
 
-    /* "polluck_blockchain/placeholder_native.pyx":79
+    /* "polluck_blockchain/placeholder_native.pyx":84
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-      if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 80, __pyx_L1_error)
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+    __pyx_t_12 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_t_6); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 85, __pyx_L1_error)
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-    /* "polluck_blockchain/placeholder_native.pyx":81
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+    __pyx_t_13 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 86, __pyx_L1_error)
 
-    /* "polluck_blockchain/placeholder_native.pyx":75
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@@ -3789,11 +3808,11 @@ static int __pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock___cinit__
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-      __PYX_ERR(0, 75, __pyx_L1_error)
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-    /* "polluck_blockchain/placeholder_native.pyx":83
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-      /* "polluck_blockchain/placeholder_native.pyx":84
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-      /* "polluck_blockchain/placeholder_native.pyx":83
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 */
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-    /* "polluck_blockchain/placeholder_native.pyx":86
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-  /* "polluck_blockchain/placeholder_native.pyx":66
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   return __pyx_r;
 }
 
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-  /* "polluck_blockchain/placeholder_native.pyx":92
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-    /* "polluck_blockchain/placeholder_native.pyx":93
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@@ -3962,7 +3981,7 @@ static void __pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4__deall
 */
     delete __pyx_v_self->BlockC;
 
-    /* "polluck_blockchain/placeholder_native.pyx":94
+    /* "polluck_blockchain/placeholder_native.pyx":99
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@@ -3971,7 +3990,7 @@ static void __pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4__deall
 */
     __pyx_v_self->BlockC = NULL;
 
-    /* "polluck_blockchain/placeholder_native.pyx":92
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@@ -3980,7 +3999,7 @@ static void __pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4__deall
 */
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-  /* "polluck_blockchain/placeholder_native.pyx":91
+  /* "polluck_blockchain/placeholder_native.pyx":96
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  *     def __dealloc__(self):             # <<<<<<<<<<<<<<
@@ -3991,7 +4010,7 @@ static void __pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4__deall
   /* function exit code */
 }
 
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@@ -4001,7 +4020,7 @@ static void __pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4__deall
 
 static struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_from_ptr(::Block *__pyx_v_block, struct __pyx_opt_args_18polluck_blockchain_18placeholder_native_7PyBlock_from_ptr *__pyx_optional_args) {
 
-  /* "polluck_blockchain/placeholder_native.pyx":97
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@@ -4027,77 +4046,77 @@ static struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx
     }
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  *     @property
  *     def prev_hash(self):
  *         return self.BlockC.prev_hash.decode("UTF-8")             # <<<<<<<<<<<<<<
@@ -4566,13 +4585,13 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_9pr
  *     @property
 */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_decode_cpp_string(__pyx_v_self->BlockC->prev_hash, 0, PY_SSIZE_T_MAX, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 148, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_decode_cpp_string(__pyx_v_self->BlockC->prev_hash, 0, PY_SSIZE_T_MAX, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 153, __pyx_L1_error)
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   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":146
+  /* "polluck_blockchain/placeholder_native.pyx":151
  *         return self.BlockC.data.decode("UTF-8")
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -4591,7 +4610,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_9pr
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":150
+/* "polluck_blockchain/placeholder_native.pyx":155
  *         return self.BlockC.prev_hash.decode("UTF-8")
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -4623,7 +4642,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_5no
   int __pyx_clineno = 0;
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-  /* "polluck_blockchain/placeholder_native.pyx":152
+  /* "polluck_blockchain/placeholder_native.pyx":157
  *     @property
  *     def nonce(self):
  *         return self.BlockC.nonce             # <<<<<<<<<<<<<<
@@ -4631,13 +4650,13 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_5no
  *     # @nonce.setter
 */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_PyLong_From_uint64_t(__pyx_v_self->BlockC->nonce); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 152, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyLong_From_uint64_t(__pyx_v_self->BlockC->nonce); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 157, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":150
+  /* "polluck_blockchain/placeholder_native.pyx":155
  *         return self.BlockC.prev_hash.decode("UTF-8")
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -4656,7 +4675,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_5no
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":158
+/* "polluck_blockchain/placeholder_native.pyx":163
  *     #     self._nonce = value
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -4688,21 +4707,21 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4ha
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("__get__", 0);
 
-  /* "polluck_blockchain/placeholder_native.pyx":160
+  /* "polluck_blockchain/placeholder_native.pyx":165
  *     @property
  *     def hash(self):
  *         return self.BlockC.hash.decode("UTF-8")             # <<<<<<<<<<<<<<
  * 
- *     cdef SerializeResult bytes_serialize_c(self):
+ *     cdef unsigned char* bytes_serialize_c(self, size_t *size):
 */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_decode_cpp_string(__pyx_v_self->BlockC->hash, 0, PY_SSIZE_T_MAX, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 160, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_decode_cpp_string(__pyx_v_self->BlockC->hash, 0, PY_SSIZE_T_MAX, NULL, NULL, PyUnicode_DecodeUTF8); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 165, __pyx_L1_error)
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   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":158
+  /* "polluck_blockchain/placeholder_native.pyx":163
  *     #     self._nonce = value
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -4721,55 +4740,53 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_4ha
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":162
+/* "polluck_blockchain/placeholder_native.pyx":167
  *         return self.BlockC.hash.decode("UTF-8")
  * 
- *     cdef SerializeResult bytes_serialize_c(self):             # <<<<<<<<<<<<<<
+ *     cdef unsigned char* bytes_serialize_c(self, size_t *size):             # <<<<<<<<<<<<<<
  *         cdef:
  *             size_t total_len
 */
 
-static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult __pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_bytes_serialize_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self) {
-  size_t __pyx_v_total_len;
+static unsigned char *__pyx_f_18polluck_blockchain_18placeholder_native_7PyBlock_bytes_serialize_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self, size_t *__pyx_v_size) {
   unsigned char *__pyx_v_buf;
   size_t __pyx_v_pos;
-  struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult __pyx_r;
+  unsigned char *__pyx_r;
   int __pyx_t_1;
   int __pyx_t_2;
-  struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult __pyx_t_3;
   int __pyx_lineno = 0;
   const char *__pyx_filename = NULL;
   int __pyx_clineno = 0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":166
+  /* "polluck_blockchain/placeholder_native.pyx":171
  *             size_t total_len
  *             unsigned char* buf
  *             size_t pos = 0             # <<<<<<<<<<<<<<
  * 
- *         # test: prev_hash + size of index (64bit)
+ *         # index (8), timestamp (8), nonce (8), data, prev_hash
 */
   __pyx_v_pos = 0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":172
- *         total_len = (
+  /* "polluck_blockchain/placeholder_native.pyx":174
+ * 
+ *         # index (8), timestamp (8), nonce (8), data, prev_hash
+ *         size[0] = (             # <<<<<<<<<<<<<<
  *             <size_t>(8 * 3) +
- *             self.BlockC.data.size() +             # <<<<<<<<<<<<<<
- *             self.BlockC.prev_hash.size()
- *         )
+ *             self.BlockC.data.size() +
 */
-  __pyx_v_total_len = ((((size_t)0x18) + __pyx_v_self->BlockC->data.size()) + __pyx_v_self->BlockC->prev_hash.size());
+  (__pyx_v_size[0]) = ((((size_t)0x18) + __pyx_v_self->BlockC->data.size()) + __pyx_v_self->BlockC->prev_hash.size());
 
-  /* "polluck_blockchain/placeholder_native.pyx":175
+  /* "polluck_blockchain/placeholder_native.pyx":179
  *             self.BlockC.prev_hash.size()
  *         )
- *         buf = <unsigned char*>malloc(total_len * sizeof(unsigned char))             # <<<<<<<<<<<<<<
+ *         buf = <unsigned char*>malloc(size[0] * sizeof(unsigned char))             # <<<<<<<<<<<<<<
  * 
  *         if buf == NULL:
 */
-  __pyx_v_buf = ((unsigned char *)malloc((__pyx_v_total_len * (sizeof(unsigned char)))));
+  __pyx_v_buf = ((unsigned char *)malloc(((__pyx_v_size[0]) * (sizeof(unsigned char)))));
 
-  /* "polluck_blockchain/placeholder_native.pyx":177
- *         buf = <unsigned char*>malloc(total_len * sizeof(unsigned char))
+  /* "polluck_blockchain/placeholder_native.pyx":181
+ *         buf = <unsigned char*>malloc(size[0] * sizeof(unsigned char))
  * 
  *         if buf == NULL:             # <<<<<<<<<<<<<<
  *             raise MemoryError()
@@ -4778,17 +4795,17 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
   __pyx_t_1 = (__pyx_v_buf == NULL);
   if (unlikely(__pyx_t_1)) {
 
-    /* "polluck_blockchain/placeholder_native.pyx":178
+    /* "polluck_blockchain/placeholder_native.pyx":182
  * 
  *         if buf == NULL:
  *             raise MemoryError()             # <<<<<<<<<<<<<<
  * 
  *         serialize_uint64(buf + pos, self.BlockC.index)
 */
-    PyErr_NoMemory(); __PYX_ERR(0, 178, __pyx_L1_error)
+    PyErr_NoMemory(); __PYX_ERR(0, 182, __pyx_L1_error)
 
-    /* "polluck_blockchain/placeholder_native.pyx":177
- *         buf = <unsigned char*>malloc(total_len * sizeof(unsigned char))
+    /* "polluck_blockchain/placeholder_native.pyx":181
+ *         buf = <unsigned char*>malloc(size[0] * sizeof(unsigned char))
  * 
  *         if buf == NULL:             # <<<<<<<<<<<<<<
  *             raise MemoryError()
@@ -4796,16 +4813,16 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   }
 
-  /* "polluck_blockchain/placeholder_native.pyx":180
+  /* "polluck_blockchain/placeholder_native.pyx":184
  *             raise MemoryError()
  * 
  *         serialize_uint64(buf + pos, self.BlockC.index)             # <<<<<<<<<<<<<<
  *         pos += 8
  *         serialize_uint64(buf + pos, self.BlockC.timestamp)
 */
-  __pyx_t_2 = __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->index); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 180, __pyx_L1_error)
+  __pyx_t_2 = __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->index); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 184, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":181
+  /* "polluck_blockchain/placeholder_native.pyx":185
  * 
  *         serialize_uint64(buf + pos, self.BlockC.index)
  *         pos += 8             # <<<<<<<<<<<<<<
@@ -4814,16 +4831,16 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   __pyx_v_pos = (__pyx_v_pos + 8);
 
-  /* "polluck_blockchain/placeholder_native.pyx":182
+  /* "polluck_blockchain/placeholder_native.pyx":186
  *         serialize_uint64(buf + pos, self.BlockC.index)
  *         pos += 8
  *         serialize_uint64(buf + pos, self.BlockC.timestamp)             # <<<<<<<<<<<<<<
  *         pos += 8
  *         serialize_uint64(buf + pos, self.BlockC.nonce)
 */
-  __pyx_t_2 = __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->timestamp); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 182, __pyx_L1_error)
+  __pyx_t_2 = __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->timestamp); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 186, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":183
+  /* "polluck_blockchain/placeholder_native.pyx":187
  *         pos += 8
  *         serialize_uint64(buf + pos, self.BlockC.timestamp)
  *         pos += 8             # <<<<<<<<<<<<<<
@@ -4832,16 +4849,16 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   __pyx_v_pos = (__pyx_v_pos + 8);
 
-  /* "polluck_blockchain/placeholder_native.pyx":184
+  /* "polluck_blockchain/placeholder_native.pyx":188
  *         serialize_uint64(buf + pos, self.BlockC.timestamp)
  *         pos += 8
  *         serialize_uint64(buf + pos, self.BlockC.nonce)             # <<<<<<<<<<<<<<
  *         pos += 8
  *         # Copy data
 */
-  __pyx_t_2 = __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->nonce); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 184, __pyx_L1_error)
+  __pyx_t_2 = __pyx_f_18polluck_blockchain_18placeholder_native_serialize_uint64((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->nonce); if (unlikely(__pyx_t_2 == ((int)-1))) __PYX_ERR(0, 188, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":185
+  /* "polluck_blockchain/placeholder_native.pyx":189
  *         pos += 8
  *         serialize_uint64(buf + pos, self.BlockC.nonce)
  *         pos += 8             # <<<<<<<<<<<<<<
@@ -4850,7 +4867,7 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   __pyx_v_pos = (__pyx_v_pos + 8);
 
-  /* "polluck_blockchain/placeholder_native.pyx":187
+  /* "polluck_blockchain/placeholder_native.pyx":191
  *         pos += 8
  *         # Copy data
  *         memcpy(             # <<<<<<<<<<<<<<
@@ -4859,7 +4876,7 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   (void)(memcpy((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->data.c_str(), __pyx_v_self->BlockC->data.size()));
 
-  /* "polluck_blockchain/placeholder_native.pyx":192
+  /* "polluck_blockchain/placeholder_native.pyx":196
  *             self.BlockC.data.size(),
  *         )
  *         pos += self.BlockC.data.size()             # <<<<<<<<<<<<<<
@@ -4868,7 +4885,7 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   __pyx_v_pos = (__pyx_v_pos + __pyx_v_self->BlockC->data.size());
 
-  /* "polluck_blockchain/placeholder_native.pyx":194
+  /* "polluck_blockchain/placeholder_native.pyx":198
  *         pos += self.BlockC.data.size()
  *         # Copy prev_hash
  *         memcpy(             # <<<<<<<<<<<<<<
@@ -4877,31 +4894,29 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
 */
   (void)(memcpy((__pyx_v_buf + __pyx_v_pos), __pyx_v_self->BlockC->prev_hash.c_str(), __pyx_v_self->BlockC->prev_hash.size()));
 
-  /* "polluck_blockchain/placeholder_native.pyx":199
+  /* "polluck_blockchain/placeholder_native.pyx":203
  *             self.BlockC.prev_hash.size(),
  *         )
  *         pos += self.BlockC.prev_hash.size()             # <<<<<<<<<<<<<<
  * 
- *         return SerializeResult(buf, total_len)
+ *         return buf
 */
   __pyx_v_pos = (__pyx_v_pos + __pyx_v_self->BlockC->prev_hash.size());
 
-  /* "polluck_blockchain/placeholder_native.pyx":201
+  /* "polluck_blockchain/placeholder_native.pyx":205
  *         pos += self.BlockC.prev_hash.size()
  * 
- *         return SerializeResult(buf, total_len)             # <<<<<<<<<<<<<<
+ *         return buf             # <<<<<<<<<<<<<<
  * 
  *     def bytes_serialize(self):
 */
-  __pyx_t_3.ptr = __pyx_v_buf;
-  __pyx_t_3.size = __pyx_v_total_len;
-  __pyx_r = __pyx_t_3;
+  __pyx_r = __pyx_v_buf;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":162
+  /* "polluck_blockchain/placeholder_native.pyx":167
  *         return self.BlockC.hash.decode("UTF-8")
  * 
- *     cdef SerializeResult bytes_serialize_c(self):             # <<<<<<<<<<<<<<
+ *     cdef unsigned char* bytes_serialize_c(self, size_t *size):             # <<<<<<<<<<<<<<
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 */
@@ -4909,17 +4924,17 @@ static struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult
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   __pyx_L1_error:;
   __Pyx_AddTraceback("polluck_blockchain.placeholder_native.PyBlock.bytes_serialize_c", __pyx_clineno, __pyx_lineno, __pyx_filename);
-  __Pyx_pretend_to_initialize(&__pyx_r);
+  __pyx_r = 0;
   __pyx_L0:;
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":203
- *         return SerializeResult(buf, total_len)
+/* "polluck_blockchain/placeholder_native.pyx":207
+ *         return buf
  * 
  *     def bytes_serialize(self):             # <<<<<<<<<<<<<<
- *         cdef SerializeResult serialize_res
- *         try:
+ *         cdef:
+ *             unsigned char *serialize_res
 */
 
 /* Python wrapper */
@@ -4965,10 +4980,11 @@ PyObject *__pyx_args, PyObject *__pyx_kwds
 }
 
 static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_10bytes_serialize(struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *__pyx_v_self) {
-  struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult __pyx_v_serialize_res;
+  unsigned char *__pyx_v_serialize_res;
+  size_t __pyx_v_serialize_size;
   PyObject *__pyx_r = NULL;
   __Pyx_RefNannyDeclarations
-  struct __pyx_t_18polluck_blockchain_18placeholder_native_SerializeResult __pyx_t_1;
+  unsigned char *__pyx_t_1;
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   int __pyx_t_3;
   int __pyx_t_4;
@@ -4984,46 +5000,46 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_10b
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-  /* "polluck_blockchain/placeholder_native.pyx":205
- *     def bytes_serialize(self):
- *         cdef SerializeResult serialize_res
+  /* "polluck_blockchain/placeholder_native.pyx":211
+ *             unsigned char *serialize_res
+ *             size_t serialize_size
  *         try:             # <<<<<<<<<<<<<<
- *             serialize_res = self.bytes_serialize_c()
- *             return serialize_res.ptr[:serialize_res.size]
+ *             serialize_res = self.bytes_serialize_c(&serialize_size)
+ *             return serialize_res[:serialize_size]
 */
   /*try:*/ {
 
-    /* "polluck_blockchain/placeholder_native.pyx":206
- *         cdef SerializeResult serialize_res
+    /* "polluck_blockchain/placeholder_native.pyx":212
+ *             size_t serialize_size
  *         try:
- *             serialize_res = self.bytes_serialize_c()             # <<<<<<<<<<<<<<
- *             return serialize_res.ptr[:serialize_res.size]
+ *             serialize_res = self.bytes_serialize_c(&serialize_size)             # <<<<<<<<<<<<<<
+ *             return serialize_res[:serialize_size]
  *         finally:
 */
-    __pyx_t_1 = ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_PyBlock *)__pyx_v_self->__pyx_vtab)->bytes_serialize_c(__pyx_v_self); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 206, __pyx_L4_error)
+    __pyx_t_1 = ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_PyBlock *)__pyx_v_self->__pyx_vtab)->bytes_serialize_c(__pyx_v_self, (&__pyx_v_serialize_size)); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 212, __pyx_L4_error)
     __pyx_v_serialize_res = __pyx_t_1;
 
-    /* "polluck_blockchain/placeholder_native.pyx":207
+    /* "polluck_blockchain/placeholder_native.pyx":213
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- *             return serialize_res.ptr[:serialize_res.size]             # <<<<<<<<<<<<<<
+ *             serialize_res = self.bytes_serialize_c(&serialize_size)
+ *             return serialize_res[:serialize_size]             # <<<<<<<<<<<<<<
  *         finally:
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+ *             free(serialize_res)
 */
     __Pyx_XDECREF(__pyx_r);
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+    __pyx_t_2 = __Pyx_PyBytes_FromStringAndSize(((char const *)__pyx_v_serialize_res) + 0, __pyx_v_serialize_size - 0); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 213, __pyx_L4_error)
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     goto __pyx_L3_return;
   }
 
-  /* "polluck_blockchain/placeholder_native.pyx":209
- *             return serialize_res.ptr[:serialize_res.size]
+  /* "polluck_blockchain/placeholder_native.pyx":215
+ *             return serialize_res[:serialize_size]
  *         finally:
- *             free(serialize_res.ptr)             # <<<<<<<<<<<<<<
- * 
+ *             free(serialize_res)             # <<<<<<<<<<<<<<
  * 
+ *     cdef unsigned char* digest(self, unsigned char *data, size_t data_size, size_t *digest_size):
 */
   /*finally:*/ {
     __pyx_L4_error:;
@@ -5042,7 +5058,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_10b
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       {
-        free(__pyx_v_serialize_res.ptr);
+        free(__pyx_v_serialize_res);
       }
       __Pyx_XGIVEREF(__pyx_t_9);
       __Pyx_XGIVEREF(__pyx_t_10);
@@ -5059,19 +5075,19 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_7PyBlock_10b
     __pyx_L3_return: {
       __pyx_t_11 = __pyx_r;
       __pyx_r = 0;
-      free(__pyx_v_serialize_res.ptr);
+      free(__pyx_v_serialize_res);
       __pyx_r = __pyx_t_11;
       __pyx_t_11 = 0;
       goto __pyx_L0;
     }
   }
 
-  /* "polluck_blockchain/placeholder_native.pyx":203
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@@ -5597,7 +6145,7 @@ static void __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain_4__d
   /* function exit code */
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":253
+/* "polluck_blockchain/placeholder_native.pyx":307
  *             self._chain = NULL
  * 
  *     def __len__(self):             # <<<<<<<<<<<<<<
@@ -5623,7 +6171,7 @@ static Py_ssize_t __pyx_pw_18polluck_blockchain_18placeholder_native_10Blockchai
 static Py_ssize_t __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain_6__len__(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self) {
   Py_ssize_t __pyx_r;
 
-  /* "polluck_blockchain/placeholder_native.pyx":254
+  /* "polluck_blockchain/placeholder_native.pyx":308
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  *     def __len__(self):
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@@ -5633,7 +6181,7 @@ static Py_ssize_t __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchai
   __pyx_r = (__pyx_v_self->_index + 1);
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":253
+  /* "polluck_blockchain/placeholder_native.pyx":307
  *             self._chain = NULL
  * 
  *     def __len__(self):             # <<<<<<<<<<<<<<
@@ -5646,7 +6194,7 @@ static Py_ssize_t __pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchai
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":256
+/* "polluck_blockchain/placeholder_native.pyx":310
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  *     def print_key_value_pair(self):             # <<<<<<<<<<<<<<
@@ -5713,7 +6261,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   int __pyx_clineno = 0;
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-  /* "polluck_blockchain/placeholder_native.pyx":257
+  /* "polluck_blockchain/placeholder_native.pyx":311
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  *         cdef BcHashmap.iterator it = self._chain.begin()             # <<<<<<<<<<<<<<
@@ -5722,7 +6270,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
 */
   __pyx_v_it = __pyx_v_self->_chain->begin();
 
-  /* "polluck_blockchain/placeholder_native.pyx":259
+  /* "polluck_blockchain/placeholder_native.pyx":313
  *         cdef BcHashmap.iterator it = self._chain.begin()
  *         cdef Block *block
  *         while it != self._chain.end():             # <<<<<<<<<<<<<<
@@ -5733,7 +6281,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
     __pyx_t_1 = (__pyx_v_it != __pyx_v_self->_chain->end());
     if (!__pyx_t_1) break;
 
-    /* "polluck_blockchain/placeholder_native.pyx":260
+    /* "polluck_blockchain/placeholder_native.pyx":314
  *         cdef Block *block
  *         while it != self._chain.end():
  *             print(dereference(it).first)             # <<<<<<<<<<<<<<
@@ -5741,7 +6289,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
  *             py_block = PyBlock.from_ptr(block)
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@@ -5749,12 +6297,12 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
       __pyx_t_2 = __Pyx_PyObject_FastCall((PyObject*)__pyx_builtin_print, __pyx_callargs+__pyx_t_5, (2-__pyx_t_5) | (__pyx_t_5*__Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET));
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-      if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 260, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
 
-    /* "polluck_blockchain/placeholder_native.pyx":261
+    /* "polluck_blockchain/placeholder_native.pyx":315
  *         while it != self._chain.end():
  *             print(dereference(it).first)
  *             block = dereference(it).second             # <<<<<<<<<<<<<<
@@ -5764,19 +6312,19 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
     __pyx_t_6 = (*__pyx_v_it).second;
     __pyx_v_block = __pyx_t_6;
 
-    /* "polluck_blockchain/placeholder_native.pyx":262
+    /* "polluck_blockchain/placeholder_native.pyx":316
  *             print(dereference(it).first)
  *             block = dereference(it).second
  *             py_block = PyBlock.from_ptr(block)             # <<<<<<<<<<<<<<
  *             print(py_block)
  *             postincrement(it)
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-    __pyx_t_2 = ((PyObject *)__pyx_vtabptr_18polluck_blockchain_18placeholder_native_PyBlock->from_ptr(__pyx_v_block, NULL)); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 262, __pyx_L1_error)
+    __pyx_t_2 = ((PyObject *)__pyx_vtabptr_18polluck_blockchain_18placeholder_native_PyBlock->from_ptr(__pyx_v_block, NULL)); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 316, __pyx_L1_error)
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     __Pyx_XDECREF_SET(__pyx_v_py_block, ((struct __pyx_obj_18polluck_blockchain_18placeholder_native_PyBlock *)__pyx_t_2));
     __pyx_t_2 = 0;
 
-    /* "polluck_blockchain/placeholder_native.pyx":263
+    /* "polluck_blockchain/placeholder_native.pyx":317
  *             block = dereference(it).second
  *             py_block = PyBlock.from_ptr(block)
  *             print(py_block)             # <<<<<<<<<<<<<<
@@ -5789,12 +6337,12 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
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       __pyx_t_2 = __Pyx_PyObject_FastCall((PyObject*)__pyx_builtin_print, __pyx_callargs+__pyx_t_5, (2-__pyx_t_5) | (__pyx_t_5*__Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET));
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-      if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 263, __pyx_L1_error)
+      if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 317, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
 
-    /* "polluck_blockchain/placeholder_native.pyx":264
+    /* "polluck_blockchain/placeholder_native.pyx":318
  *             py_block = PyBlock.from_ptr(block)
  *             print(py_block)
  *             postincrement(it)             # <<<<<<<<<<<<<<
@@ -5804,7 +6352,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
     (void)((__pyx_v_it++));
   }
 
-  /* "polluck_blockchain/placeholder_native.pyx":256
+  /* "polluck_blockchain/placeholder_native.pyx":310
  *         return self._index + 1
  * 
  *     def print_key_value_pair(self):             # <<<<<<<<<<<<<<
@@ -5828,7 +6376,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":266
+/* "polluck_blockchain/placeholder_native.pyx":320
  *             postincrement(it)
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -5860,7 +6408,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("__get__", 0);
 
-  /* "polluck_blockchain/placeholder_native.pyx":268
+  /* "polluck_blockchain/placeholder_native.pyx":322
  *     @property
  *     def genesis_done(self):
  *         return self._genesis_done             # <<<<<<<<<<<<<<
@@ -5868,13 +6416,13 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
  *     @property
 */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_PyBool_FromLong(__pyx_v_self->_genesis_done); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 268, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyBool_FromLong(__pyx_v_self->_genesis_done); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 322, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":266
+  /* "polluck_blockchain/placeholder_native.pyx":320
  *             postincrement(it)
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -5893,7 +6441,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":270
+/* "polluck_blockchain/placeholder_native.pyx":324
  *         return self._genesis_done
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -5925,7 +6473,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("__get__", 0);
 
-  /* "polluck_blockchain/placeholder_native.pyx":272
+  /* "polluck_blockchain/placeholder_native.pyx":326
  *     @property
  *     def index(self):
  *         return self._index             # <<<<<<<<<<<<<<
@@ -5933,13 +6481,13 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
  *     # TODO error handling
 */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_PyLong_From_uint64_t(__pyx_v_self->_index); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 272, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyLong_From_uint64_t(__pyx_v_self->_index); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 326, __pyx_L1_error)
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   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":270
+  /* "polluck_blockchain/placeholder_native.pyx":324
  *         return self._genesis_done
  * 
  *     @property             # <<<<<<<<<<<<<<
@@ -5958,7 +6506,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":275
+/* "polluck_blockchain/placeholder_native.pyx":329
  * 
  *     # TODO error handling
  *     cdef Block* get_block_c(self, uint64_t idx):             # <<<<<<<<<<<<<<
@@ -5969,7 +6517,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
 static ::Block *__pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_get_block_c(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self, uint64_t __pyx_v_idx) {
   ::Block *__pyx_r;
 
-  /* "polluck_blockchain/placeholder_native.pyx":276
+  /* "polluck_blockchain/placeholder_native.pyx":330
  *     # TODO error handling
  *     cdef Block* get_block_c(self, uint64_t idx):
  *         return self._chain[0][idx]             # <<<<<<<<<<<<<<
@@ -5979,7 +6527,7 @@ static ::Block *__pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_g
   __pyx_r = ((__pyx_v_self->_chain[0])[__pyx_v_idx]);
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":275
+  /* "polluck_blockchain/placeholder_native.pyx":329
  * 
  *     # TODO error handling
  *     cdef Block* get_block_c(self, uint64_t idx):             # <<<<<<<<<<<<<<
@@ -5992,7 +6540,7 @@ static ::Block *__pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_g
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":278
+/* "polluck_blockchain/placeholder_native.pyx":332
  *         return self._chain[0][idx]
  * 
  *     def get_block(self, idx):             # <<<<<<<<<<<<<<
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   {
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     const Py_ssize_t __pyx_kwds_len = (__pyx_kwds) ? __Pyx_NumKwargs_FASTCALL(__pyx_kwds) : 0;
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     if (__pyx_kwds_len > 0) {
       switch (__pyx_nargs) {
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         values[0] = __Pyx_ArgRef_FASTCALL(__pyx_args, 0);
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       const Py_ssize_t kwd_pos_args = __pyx_nargs;
-      if (__Pyx_ParseKeywords(__pyx_kwds, __pyx_kwvalues, __pyx_pyargnames, 0, values, kwd_pos_args, __pyx_kwds_len, "get_block", 0) < (0)) __PYX_ERR(0, 278, __pyx_L3_error)
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-        if (unlikely(!values[i])) { __Pyx_RaiseArgtupleInvalid("get_block", 1, 1, 1, i); __PYX_ERR(0, 278, __pyx_L3_error) }
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-      if (!CYTHON_ASSUME_SAFE_MACROS && unlikely(!values[0])) __PYX_ERR(0, 278, __pyx_L3_error)
+      if (!CYTHON_ASSUME_SAFE_MACROS && unlikely(!values[0])) __PYX_ERR(0, 332, __pyx_L3_error)
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     __pyx_v_idx = values[0];
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   goto __pyx_L6_skip;
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-  __Pyx_RaiseArgtupleInvalid("get_block", 1, 1, 1, __pyx_nargs); __PYX_ERR(0, 278, __pyx_L3_error)
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   __Pyx_RefNannySetupContext("get_block", 0);
 
-  /* "polluck_blockchain/placeholder_native.pyx":279
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-    /* "polluck_blockchain/placeholder_native.pyx":280
+    /* "polluck_blockchain/placeholder_native.pyx":334
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@@ -6140,14 +6688,14 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
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-    /* "polluck_blockchain/placeholder_native.pyx":279
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 */
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-  /* "polluck_blockchain/placeholder_native.pyx":282
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+  __pyx_t_6 = __Pyx_PyLong_As_uint64_t(__pyx_v_idx); if (unlikely((__pyx_t_6 == ((uint64_t)-1)) && PyErr_Occurred())) __PYX_ERR(0, 336, __pyx_L1_error)
+  __pyx_t_7 = ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_Blockchain *)__pyx_v_self->__pyx_vtab)->get_block_c(__pyx_v_self, __pyx_t_6); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 336, __pyx_L1_error)
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-  /* "polluck_blockchain/placeholder_native.pyx":283
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  *         cdef Block *block = self.get_block_c(idx)
  *         return PyBlock.from_ptr(block, owner=False)             # <<<<<<<<<<<<<<
@@ -6177,13 +6725,13 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   __Pyx_XDECREF(__pyx_r);
   __pyx_t_8.__pyx_n = 1;
   __pyx_t_8.owner = 0;
-  __pyx_t_4 = ((PyObject *)__pyx_vtabptr_18polluck_blockchain_18placeholder_native_PyBlock->from_ptr(__pyx_v_block, &__pyx_t_8)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 283, __pyx_L1_error)
+  __pyx_t_4 = ((PyObject *)__pyx_vtabptr_18polluck_blockchain_18placeholder_native_PyBlock->from_ptr(__pyx_v_block, &__pyx_t_8)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 337, __pyx_L1_error)
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   __pyx_t_4 = 0;
   goto __pyx_L0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":278
+  /* "polluck_blockchain/placeholder_native.pyx":332
  *         return self._chain[0][idx]
  * 
  *     def get_block(self, idx):             # <<<<<<<<<<<<<<
@@ -6203,7 +6751,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":285
+/* "polluck_blockchain/placeholder_native.pyx":339
  *         return PyBlock.from_ptr(block, owner=False)
  * 
  *     cdef void add_block(self, Block *block):             # <<<<<<<<<<<<<<
@@ -6213,7 +6761,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
 
 static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_block(struct __pyx_obj_18polluck_blockchain_18placeholder_native_Blockchain *__pyx_v_self, ::Block *__pyx_v_block) {
 
-  /* "polluck_blockchain/placeholder_native.pyx":286
+  /* "polluck_blockchain/placeholder_native.pyx":340
  * 
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  *         self._chain[0][block.index] = block             # <<<<<<<<<<<<<<
@@ -6222,7 +6770,7 @@ static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_b
 */
   ((__pyx_v_self->_chain[0])[__pyx_v_block->index]) = __pyx_v_block;
 
-  /* "polluck_blockchain/placeholder_native.pyx":287
+  /* "polluck_blockchain/placeholder_native.pyx":341
  *     cdef void add_block(self, Block *block):
  *         self._chain[0][block.index] = block
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@@ -6231,7 +6779,7 @@ static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_b
 */
   if (__pyx_v_self->_genesis_done) {
 
-    /* "polluck_blockchain/placeholder_native.pyx":288
+    /* "polluck_blockchain/placeholder_native.pyx":342
  *         self._chain[0][block.index] = block
  *         if self._genesis_done:
  *             self._index += 1             # <<<<<<<<<<<<<<
@@ -6240,7 +6788,7 @@ static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_b
 */
     __pyx_v_self->_index = (__pyx_v_self->_index + 1);
 
-    /* "polluck_blockchain/placeholder_native.pyx":287
+    /* "polluck_blockchain/placeholder_native.pyx":341
  *     cdef void add_block(self, Block *block):
  *         self._chain[0][block.index] = block
  *         if self._genesis_done:             # <<<<<<<<<<<<<<
@@ -6249,7 +6797,7 @@ static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_b
 */
   }
 
-  /* "polluck_blockchain/placeholder_native.pyx":285
+  /* "polluck_blockchain/placeholder_native.pyx":339
  *         return PyBlock.from_ptr(block, owner=False)
  * 
  *     cdef void add_block(self, Block *block):             # <<<<<<<<<<<<<<
@@ -6260,7 +6808,7 @@ static void __pyx_f_18polluck_blockchain_18placeholder_native_10Blockchain_add_b
   /* function exit code */
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":290
+/* "polluck_blockchain/placeholder_native.pyx":344
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  * 
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@@ -6329,19 +6877,19 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   int __pyx_clineno = 0;
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-  /* "polluck_blockchain/placeholder_native.pyx":293
+  /* "polluck_blockchain/placeholder_native.pyx":347
  *         cdef Block *block = new Block(
  *             self._index,
  *             int(datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()),             # <<<<<<<<<<<<<<
  *             0,
  *             "Genesis Block".encode("UTF-8"),
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+  __Pyx_GetModuleGlobalName(__pyx_t_3, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 347, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_3);
-  __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_t_3, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 293, __pyx_L1_error)
+  __pyx_t_4 = __Pyx_PyObject_GetAttrStr(__pyx_t_3, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 347, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_4);
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
-  __pyx_t_3 = __Pyx_PyObject_Call(__pyx_t_4, __pyx_mstate_global->__pyx_tuple[0], NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 293, __pyx_L1_error)
+  __pyx_t_3 = __Pyx_PyObject_Call(__pyx_t_4, __pyx_mstate_global->__pyx_tuple[0], NULL); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 347, __pyx_L1_error)
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@@ -6352,43 +6900,43 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
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-    if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 293, __pyx_L1_error)
+    if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 347, __pyx_L1_error)
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-  __pyx_t_3 = __Pyx_PyNumber_Int(__pyx_t_1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 293, __pyx_L1_error)
+  __pyx_t_3 = __Pyx_PyNumber_Int(__pyx_t_1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 347, __pyx_L1_error)
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+  __pyx_t_6 = __Pyx_PyFloat_AsDouble(__pyx_t_3); if (unlikely((__pyx_t_6 == (double)-1) && PyErr_Occurred())) __PYX_ERR(0, 347, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0;
 
-  /* "polluck_blockchain/placeholder_native.pyx":295
+  /* "polluck_blockchain/placeholder_native.pyx":349
  *             int(datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()),
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  *             "0".encode("UTF-8"),
  *             "".encode("UTF-8"),
 */
-  __pyx_t_7 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_Genesis_Block); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 295, __pyx_L1_error)
+  __pyx_t_7 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_Genesis_Block); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 349, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":296
+  /* "polluck_blockchain/placeholder_native.pyx":350
  *             0,
  *             "Genesis Block".encode("UTF-8"),
  *             "0".encode("UTF-8"),             # <<<<<<<<<<<<<<
  *             "".encode("UTF-8"),
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 */
-  __pyx_t_8 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_0); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 296, __pyx_L1_error)
+  __pyx_t_8 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_0); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 350, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":297
+  /* "polluck_blockchain/placeholder_native.pyx":351
  *             "Genesis Block".encode("UTF-8"),
  *             "0".encode("UTF-8"),
  *             "".encode("UTF-8"),             # <<<<<<<<<<<<<<
  *         )
  *         block.hash = "dummy hash".encode("UTF-8")
 */
-  __pyx_t_9 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 297, __pyx_L1_error)
+  __pyx_t_9 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 351, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":291
+  /* "polluck_blockchain/placeholder_native.pyx":345
  * 
  *     def create_genesis_block(self):
  *         cdef Block *block = new Block(             # <<<<<<<<<<<<<<
@@ -6399,30 +6947,30 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
     __pyx_t_10 = new ::Block(__pyx_v_self->_index, __pyx_t_6, 0, __pyx_t_7, __pyx_t_8, __pyx_t_9);
   } catch(...) {
     __Pyx_CppExn2PyErr();
-    __PYX_ERR(0, 291, __pyx_L1_error)
+    __PYX_ERR(0, 345, __pyx_L1_error)
   }
   __pyx_v_block = __pyx_t_10;
 
-  /* "polluck_blockchain/placeholder_native.pyx":299
+  /* "polluck_blockchain/placeholder_native.pyx":353
  *             "".encode("UTF-8"),
  *         )
  *         block.hash = "dummy hash".encode("UTF-8")             # <<<<<<<<<<<<<<
  *         self.add_block(block)
  *         self._genesis_done = True
 */
-  __pyx_t_9 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_dummy_hash); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 299, __pyx_L1_error)
+  __pyx_t_9 = __pyx_convert_string_from_py_6libcpp_6string_std__in_string(__pyx_mstate_global->__pyx_kp_b_dummy_hash); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 353, __pyx_L1_error)
   __pyx_v_block->hash = __PYX_STD_MOVE_IF_SUPPORTED(__pyx_t_9);
 
-  /* "polluck_blockchain/placeholder_native.pyx":300
+  /* "polluck_blockchain/placeholder_native.pyx":354
  *         )
  *         block.hash = "dummy hash".encode("UTF-8")
  *         self.add_block(block)             # <<<<<<<<<<<<<<
  *         self._genesis_done = True
  * 
 */
-  ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_Blockchain *)__pyx_v_self->__pyx_vtab)->add_block(__pyx_v_self, __pyx_v_block); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 300, __pyx_L1_error)
+  ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_Blockchain *)__pyx_v_self->__pyx_vtab)->add_block(__pyx_v_self, __pyx_v_block); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 354, __pyx_L1_error)
 
-  /* "polluck_blockchain/placeholder_native.pyx":301
+  /* "polluck_blockchain/placeholder_native.pyx":355
  *         block.hash = "dummy hash".encode("UTF-8")
  *         self.add_block(block)
  *         self._genesis_done = True             # <<<<<<<<<<<<<<
@@ -6431,7 +6979,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
 */
   __pyx_v_self->_genesis_done = 1;
 
-  /* "polluck_blockchain/placeholder_native.pyx":290
+  /* "polluck_blockchain/placeholder_native.pyx":344
  *             self._index += 1
  * 
  *     def create_genesis_block(self):             # <<<<<<<<<<<<<<
@@ -6455,7 +7003,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   return __pyx_r;
 }
 
-/* "polluck_blockchain/placeholder_native.pyx":303
+/* "polluck_blockchain/placeholder_native.pyx":357
  *         self._genesis_done = True
  * 
  *     def new_block(self, data):             # <<<<<<<<<<<<<<
@@ -6502,32 +7050,32 @@ PyObject *__pyx_args, PyObject *__pyx_kwds
   {
     PyObject ** const __pyx_pyargnames[] = {&__pyx_mstate_global->__pyx_n_u_data,0};
     const Py_ssize_t __pyx_kwds_len = (__pyx_kwds) ? __Pyx_NumKwargs_FASTCALL(__pyx_kwds) : 0;
-    if (unlikely(__pyx_kwds_len) < 0) __PYX_ERR(0, 303, __pyx_L3_error)
+    if (unlikely(__pyx_kwds_len) < 0) __PYX_ERR(0, 357, __pyx_L3_error)
     if (__pyx_kwds_len > 0) {
       switch (__pyx_nargs) {
         case  1:
         values[0] = __Pyx_ArgRef_FASTCALL(__pyx_args, 0);
-        if (!CYTHON_ASSUME_SAFE_MACROS && unlikely(!values[0])) __PYX_ERR(0, 303, __pyx_L3_error)
+        if (!CYTHON_ASSUME_SAFE_MACROS && unlikely(!values[0])) __PYX_ERR(0, 357, __pyx_L3_error)
         CYTHON_FALLTHROUGH;
         case  0: break;
         default: goto __pyx_L5_argtuple_error;
       }
       const Py_ssize_t kwd_pos_args = __pyx_nargs;
-      if (__Pyx_ParseKeywords(__pyx_kwds, __pyx_kwvalues, __pyx_pyargnames, 0, values, kwd_pos_args, __pyx_kwds_len, "new_block", 0) < (0)) __PYX_ERR(0, 303, __pyx_L3_error)
+      if (__Pyx_ParseKeywords(__pyx_kwds, __pyx_kwvalues, __pyx_pyargnames, 0, values, kwd_pos_args, __pyx_kwds_len, "new_block", 0) < (0)) __PYX_ERR(0, 357, __pyx_L3_error)
       for (Py_ssize_t i = __pyx_nargs; i < 1; i++) {
-        if (unlikely(!values[i])) { __Pyx_RaiseArgtupleInvalid("new_block", 1, 1, 1, i); __PYX_ERR(0, 303, __pyx_L3_error) }
+        if (unlikely(!values[i])) { __Pyx_RaiseArgtupleInvalid("new_block", 1, 1, 1, i); __PYX_ERR(0, 357, __pyx_L3_error) }
       }
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       goto __pyx_L5_argtuple_error;
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       values[0] = __Pyx_ArgRef_FASTCALL(__pyx_args, 0);
-      if (!CYTHON_ASSUME_SAFE_MACROS && unlikely(!values[0])) __PYX_ERR(0, 303, __pyx_L3_error)
+      if (!CYTHON_ASSUME_SAFE_MACROS && unlikely(!values[0])) __PYX_ERR(0, 357, __pyx_L3_error)
     }
     __pyx_v_data = values[0];
   }
   goto __pyx_L6_skip;
   __pyx_L5_argtuple_error:;
-  __Pyx_RaiseArgtupleInvalid("new_block", 1, 1, 1, __pyx_nargs); __PYX_ERR(0, 303, __pyx_L3_error)
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   goto __pyx_L4_argument_unpacking_done;
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@@ -6570,7 +7118,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("new_block", 0);
 
-  /* "polluck_blockchain/placeholder_native.pyx":304
+  /* "polluck_blockchain/placeholder_native.pyx":358
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  *     def new_block(self, data):
  *         if not self._genesis_done:             # <<<<<<<<<<<<<<
@@ -6580,7 +7128,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   __pyx_t_1 = (!__pyx_v_self->_genesis_done);
   if (unlikely(__pyx_t_1)) {
 
-    /* "polluck_blockchain/placeholder_native.pyx":305
+    /* "polluck_blockchain/placeholder_native.pyx":359
  *     def new_block(self, data):
  *         if not self._genesis_done:
  *             raise RuntimeError("Create a genesis block first.")             # <<<<<<<<<<<<<<
@@ -6593,14 +7141,14 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
       PyObject *__pyx_callargs[2] = {__pyx_t_3, __pyx_mstate_global->__pyx_kp_u_Create_a_genesis_block_first};
       __pyx_t_2 = __Pyx_PyObject_FastCall((PyObject*)(((PyTypeObject*)PyExc_RuntimeError)), __pyx_callargs+__pyx_t_4, (2-__pyx_t_4) | (__pyx_t_4*__Pyx_PY_VECTORCALL_ARGUMENTS_OFFSET));
       __Pyx_XDECREF(__pyx_t_3); __pyx_t_3 = 0;
-      if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 305, __pyx_L1_error)
+      if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 359, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
-    __PYX_ERR(0, 305, __pyx_L1_error)
+    __PYX_ERR(0, 359, __pyx_L1_error)
 
-    /* "polluck_blockchain/placeholder_native.pyx":304
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  *     def new_block(self, data):
  *         if not self._genesis_done:             # <<<<<<<<<<<<<<
@@ -6609,17 +7157,17 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
 */
   }
 
-  /* "polluck_blockchain/placeholder_native.pyx":307
+  /* "polluck_blockchain/placeholder_native.pyx":361
  *             raise RuntimeError("Create a genesis block first.")
  * 
  *         cdef Block *prev_block = self.get_block_c(self._index)             # <<<<<<<<<<<<<<
  *         cdef string prev_hash = prev_block.prev_hash
  *         cdef uint64_t new_idx = self._index + 1
 */
-  __pyx_t_5 = ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_Blockchain *)__pyx_v_self->__pyx_vtab)->get_block_c(__pyx_v_self, __pyx_v_self->_index); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 307, __pyx_L1_error)
+  __pyx_t_5 = ((struct __pyx_vtabstruct_18polluck_blockchain_18placeholder_native_Blockchain *)__pyx_v_self->__pyx_vtab)->get_block_c(__pyx_v_self, __pyx_v_self->_index); if (unlikely(PyErr_Occurred())) __PYX_ERR(0, 361, __pyx_L1_error)
   __pyx_v_prev_block = __pyx_t_5;
 
-  /* "polluck_blockchain/placeholder_native.pyx":308
+  /* "polluck_blockchain/placeholder_native.pyx":362
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  *         cdef Block *prev_block = self.get_block_c(self._index)
  *         cdef string prev_hash = prev_block.prev_hash             # <<<<<<<<<<<<<<
@@ -6629,7 +7177,7 @@ static PyObject *__pyx_pf_18polluck_blockchain_18placeholder_native_10Blockchain
   __pyx_t_6 = __pyx_v_prev_block->prev_hash;
   __pyx_v_prev_hash = __PYX_STD_MOVE_IF_SUPPORTED(__pyx_t_6);
 
-  /* "polluck_blockchain/placeholder_native.pyx":309
+  /* "polluck_blockchain/placeholder_native.pyx":363
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 */
   __pyx_v_new_idx = (__pyx_v_self->_index + 1);
 
-  /* "polluck_blockchain/placeholder_native.pyx":313
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-  __Pyx_GetModuleGlobalName(__pyx_t_7, __pyx_mstate_global->__pyx_n_u_datetime); if (unlikely(!__pyx_t_7)) __PYX_ERR(0, 313, __pyx_L1_error)
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-    PyObject *data = __Pyx_DecompressString(cstring, 965, 2);
+    const struct { const unsigned int length: 7; } index[] = {{25},{29},{28},{8},{5},{1},{1},{7},{6},{2},{9},{50},{45},{14},{10},{28},{30},{31},{20},{20},{31},{7},{25},{27},{23},{20},{20},{12},{18},{5},{15},{18},{20},{4},{8},{11},{20},{6},{8},{13},{8},{9},{12},{4},{7},{3},{3},{5},{13},{2},{5},{8},{10},{8},{9},{7},{5},{12},{37},{3},{10},{9},{13},{5},{20},{8},{11},{14},{12},{10},{17},{13},{8},{4},{13},{14},{12},{10},{12},{19},{6},{8},{4},{9},{6},{0},{1},{13},{10},{52},{121},{37},{101},{71},{61},{9}};
+    #if (CYTHON_COMPRESS_STRINGS) == 2 /* compression: bz2 (1004 bytes) */
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-    PyObject *data = __Pyx_DecompressString(cstring, 831, 1);
+    #elif (CYTHON_COMPRESS_STRINGS) != 0 /* compression: zlib (895 bytes) */
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+    #else /* compression: none (1593 bytes) */
+const char* const bytes = "Could not allocate hasmapCreate a genesis block first.Index value is out of boundsPyBlock(UTF-8)?disableenablegcisenabledno default __reduce__ due to non-trivial __cinit__src/polluck_blockchain/placeholder_native.pyx<stringsource>BlockchainBlockchain.__reduce_cython__Blockchain.__setstate_cython__Blockchain.create_genesis_blockBlockchain.get_blockBlockchain.new_blockBlockchain.print_key_value_pairPyBlockPyBlock.__reduce_cython__PyBlock.__setstate_cython__PyBlock.bytes_serializePyBlock.perform_hash__Pyx_PyDict_NextRefTIMEZONE_UTCasyncio.coroutinesblockbytes_serializecline_in_tracebackcreate_genesis_blockdatadatetimedopt_basicsdopt_basics.datetimeencodefrom_ptrfromtimestamp__func__get_block__getstate__hashhashlibhexidxindex_is_coroutineititems__main____module____name__new_blocknew_idxnonceperform_hashpolluck_blockchain.placeholder_nativepopprev_blockprev_hashprevious_hashprintprint_key_value_pairpy_block__pyx_state__pyx_vtable____qualname____reduce____reduce_cython____reduce_ex____repr__selfserialize_resserialize_size__set_name__setdefault__setstate____setstate_cython__struct__test__timetimestampvalues0Genesis Blockdummy hash\200A\330\010\013\2104\210r\220\022\2203\220d\230\"\230D\240\001\330\014\022\220*\230A\230Q\340\010\034\230D\240\014\250A\250Q\330\010\026\220i\230q\240\r\250Q\200A\330\010\013\2104\210t\2201\330\014\022\220,\230a\230q\340\010!\240\024\240\\\260\021\260$\260a\330\010 \240\n\250!\330\010 \240\004\240H\250B\250a\340\010\034\230I\240Q\330\014\r\330\014\017\210q\220\010\230\t\240\021\240&\250\004\250C\250t\2603\260b\270\n\300!\330\014\r\330\014\020\220\007\220q\230\001\330\014\r\330\014\016\210g\220Q\220a\340\010\014\210J\220a\220q\200A\360\010\000\t\n\330\014\034\230D\320 2\260!\2601\260A\330\014\023\220=\240\002\240!\340\014\020\220\001\220\021\200A\330\010\034\230I\240Q\330\014\020\220\001\330\014\017\210q\220\010\230\t\240\021\240&\250\004\250C\250t\2603\260b\270\n\300!\330\014\r\330\014\033\2307\240!\2401\330\014\017\210w\220a\220q\330\014\016""\210g\220Q\220a\340\010\r\210X\220\\\240\027\250\001\250\021\330\010\014\210J\220a\220q\330\010\014\320\014\035\230Q\200A\330\010%\240T\250\027\260\006\260a\340\010\016\210c\220\023\220D\230\007\230t\2401\330\014\021\220\021\220,\230c\240\021\330\014\024\220L\240\003\2401\330\014\036\230i\240q\250\001\330\014\021\220\021\220!\330\014\031\230\021\230!\200A\360\n\000\t\n\330\014\025\220T\230\037\250\001\250\021\250!\330\014\020\220\007\220x\230u\240A\240V\2502\250]\270$\270b\300\007\300q\310\001\340\014\020\220\001\220\021\340\010\017\210t\2201\200\001\330\004\n\210+\220Q";
     PyObject *data = NULL;
     CYTHON_UNUSED_VAR(__Pyx_DecompressString);
     #endif
     PyObject **stringtab = __pyx_mstate->__pyx_string_tab;
     Py_ssize_t pos = 0;
-    for (int i = 0; i < 82; i++) {
+    for (int i = 0; i < 85; i++) {
       Py_ssize_t bytes_length = index[i].length;
       PyObject *string = PyUnicode_DecodeUTF8(bytes + pos, bytes_length, NULL);
       if (likely(string) && i >= 14) PyUnicode_InternInPlace(&string);
@@ -8043,7 +8609,7 @@ const char* const bytes = "Could not allocate hasmapCreate a genesis block first
       stringtab[i] = string;
       pos += bytes_length;
     }
-    for (int i = 82; i < 92; i++) {
+    for (int i = 85; i < 96; i++) {
       Py_ssize_t bytes_length = index[i].length;
       PyObject *string = PyBytes_FromStringAndSize(bytes + pos, bytes_length);
       stringtab[i] = string;
@@ -8054,15 +8620,15 @@ const char* const bytes = "Could not allocate hasmapCreate a genesis block first
       }
     }
     Py_XDECREF(data);
-    for (Py_ssize_t i = 0; i < 92; i++) {
+    for (Py_ssize_t i = 0; i < 96; i++) {
       if (unlikely(PyObject_Hash(stringtab[i]) == -1)) {
         __PYX_ERR(0, 1, __pyx_L1_error)
       }
     }
     #if CYTHON_IMMORTAL_CONSTANTS
     {
-      PyObject **table = stringtab + 82;
-      for (Py_ssize_t i=0; i<10; ++i) {
+      PyObject **table = stringtab + 85;
+      for (Py_ssize_t i=0; i<11; ++i) {
         #if CYTHON_COMPILING_IN_CPYTHON_FREETHREADING
         Py_SET_REFCNT(table[i], _Py_IMMORTAL_REFCNT_LOCAL);
         #else
@@ -8121,49 +8687,54 @@ static int __Pyx_CreateCodeObjects(__pyx_mstatetype *__pyx_mstate) {
   PyObject* tuple_dedup_map = PyDict_New();
   if (unlikely(!tuple_dedup_map)) return -1;
   {
-    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 2, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 203};
-    PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_serialize_res};
-    __pyx_mstate_global->__pyx_codeobj_tab[0] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_bytes_serialize, __pyx_mstate->__pyx_kp_b_iso88591_A_D_2_Bm1_a, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[0])) goto bad;
+    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 3, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 207};
+    PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_serialize_res, __pyx_mstate->__pyx_n_u_serialize_size};
+    __pyx_mstate_global->__pyx_codeobj_tab[0] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_bytes_serialize, __pyx_mstate->__pyx_kp_b_iso88591_A_D_2_1A, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[0])) goto bad;
+  }
+  {
+    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 1, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 251};
+    PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self};
+    __pyx_mstate_global->__pyx_codeobj_tab[1] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_perform_hash, __pyx_mstate->__pyx_kp_b_iso88591_A_T_xuAV2_b_q_t1, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[1])) goto bad;
   }
   {
     const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 1, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 1};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self};
-    __pyx_mstate_global->__pyx_codeobj_tab[1] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_reduce_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[1])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[2] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_reduce_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[2])) goto bad;
   }
   {
     const __Pyx_PyCode_New_function_description descr = {2, 0, 0, 2, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 3};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_pyx_state};
-    __pyx_mstate_global->__pyx_codeobj_tab[2] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_setstate_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[2])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[3] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_setstate_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[3])) goto bad;
   }
   {
-    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 4, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 256};
+    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 4, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 310};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_it, __pyx_mstate->__pyx_n_u_block, __pyx_mstate->__pyx_n_u_py_block};
-    __pyx_mstate_global->__pyx_codeobj_tab[3] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_print_key_value_pair, __pyx_mstate->__pyx_kp_b_iso88591_A_T_a_c_D_t1_c_L_1_iq, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[3])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[4] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_print_key_value_pair, __pyx_mstate->__pyx_kp_b_iso88591_A_T_a_c_D_t1_c_L_1_iq, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[4])) goto bad;
   }
   {
-    const __Pyx_PyCode_New_function_description descr = {2, 0, 0, 3, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 278};
+    const __Pyx_PyCode_New_function_description descr = {2, 0, 0, 3, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 332};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_idx, __pyx_mstate->__pyx_n_u_block};
-    __pyx_mstate_global->__pyx_codeobj_tab[4] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_get_block, __pyx_mstate->__pyx_kp_b_iso88591_A_4r_3d_D_AQ_D_AQ_iq_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[4])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[5] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_get_block, __pyx_mstate->__pyx_kp_b_iso88591_A_4r_3d_D_AQ_D_AQ_iq_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[5])) goto bad;
   }
   {
-    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 2, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 290};
+    const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 2, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 344};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_block};
-    __pyx_mstate_global->__pyx_codeobj_tab[5] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_create_genesis_block, __pyx_mstate->__pyx_kp_b_iso88591_A_IQ_q_Ct3b_7_1_waq_gQa_X_Jaq_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[5])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[6] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_create_genesis_block, __pyx_mstate->__pyx_kp_b_iso88591_A_IQ_q_Ct3b_7_1_waq_gQa_X_Jaq_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[6])) goto bad;
   }
   {
-    const __Pyx_PyCode_New_function_description descr = {2, 0, 0, 6, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 303};
+    const __Pyx_PyCode_New_function_description descr = {2, 0, 0, 6, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 357};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_data, __pyx_mstate->__pyx_n_u_prev_block, __pyx_mstate->__pyx_n_u_prev_hash, __pyx_mstate->__pyx_n_u_new_idx, __pyx_mstate->__pyx_n_u_block};
-    __pyx_mstate_global->__pyx_codeobj_tab[6] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_new_block, __pyx_mstate->__pyx_kp_b_iso88591_A_4t1_aq_a_HBa_IQ_q_Ct3b_q_gQa_J, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[6])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[7] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_src_polluck_blockchain_placehold, __pyx_mstate->__pyx_n_u_new_block, __pyx_mstate->__pyx_kp_b_iso88591_A_4t1_aq_a_HBa_IQ_q_Ct3b_q_gQa_J, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[7])) goto bad;
   }
   {
     const __Pyx_PyCode_New_function_description descr = {1, 0, 0, 1, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 1};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self};
-    __pyx_mstate_global->__pyx_codeobj_tab[7] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_reduce_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[7])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[8] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_reduce_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[8])) goto bad;
   }
   {
     const __Pyx_PyCode_New_function_description descr = {2, 0, 0, 2, (unsigned int)(CO_OPTIMIZED|CO_NEWLOCALS), 3};
     PyObject* const varnames[] = {__pyx_mstate->__pyx_n_u_self, __pyx_mstate->__pyx_n_u_pyx_state};
-    __pyx_mstate_global->__pyx_codeobj_tab[8] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_setstate_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[8])) goto bad;
+    __pyx_mstate_global->__pyx_codeobj_tab[9] = __Pyx_PyCode_New(descr, varnames, __pyx_mstate->__pyx_kp_u_stringsource, __pyx_mstate->__pyx_n_u_setstate_cython, __pyx_mstate->__pyx_kp_b_iso88591_Q, tuple_dedup_map); if (unlikely(!__pyx_mstate_global->__pyx_codeobj_tab[9])) goto bad;
   }
   Py_DECREF(tuple_dedup_map);
   return 0;
diff --git a/src/polluck_blockchain/placeholder_native.pyx b/src/polluck_blockchain/placeholder_native.pyx
index f0a2ecb..8a27b97 100644
--- a/src/polluck_blockchain/placeholder_native.pyx
+++ b/src/polluck_blockchain/placeholder_native.pyx
@@ -20,6 +20,7 @@ from libc.stdint cimport uint64_t
 from libc.stdlib cimport malloc, free
 from libc.string cimport memcpy
 from cython.operator import postincrement, dereference
+cimport polluck_blockchain.openssl_evp as ossl
 
 
 ctypedef unsigned long ULong
@@ -48,9 +49,13 @@ cdef int serialize_uint64(unsigned char* out, unsigned long long v) except -1 no
     out[6] = (v >> 8)  & 0xFF
     out[7] = v & 0xFF
 
-cdef struct SerializeResult:
-    unsigned char *ptr
-    size_t size
+# cdef struct SerializeResult:
+#     unsigned char *ptr
+#     size_t size
+
+# cdef struct DigestResult:
+#     unsigned char *ptr
+#     size_t size
 
 cdef class PyBlock:
     cdef:
@@ -159,19 +164,19 @@ cdef class PyBlock:
     def hash(self):
         return self.BlockC.hash.decode("UTF-8")
 
-    cdef SerializeResult bytes_serialize_c(self):
+    cdef unsigned char* bytes_serialize_c(self, size_t *size):
         cdef:
             size_t total_len
             unsigned char* buf
             size_t pos = 0
         
         # index (8), timestamp (8), nonce (8), data, prev_hash
-        total_len = (
+        size[0] = (
             <size_t>(8 * 3) +
             self.BlockC.data.size() + 
             self.BlockC.prev_hash.size()
         )
-        buf = <unsigned char*>malloc(total_len * sizeof(unsigned char))
+        buf = <unsigned char*>malloc(size[0] * sizeof(unsigned char))
 
         if buf == NULL:
             raise MemoryError()
@@ -197,15 +202,65 @@ cdef class PyBlock:
         )
         pos += self.BlockC.prev_hash.size()
 
-        return SerializeResult(buf, total_len)
+        return buf
 
     def bytes_serialize(self):
-        cdef SerializeResult serialize_res
+        cdef:
+            unsigned char *serialize_res
+            size_t serialize_size
         try:
-            serialize_res = self.bytes_serialize_c()
-            return serialize_res.ptr[:serialize_res.size]
+            serialize_res = self.bytes_serialize_c(&serialize_size)
+            return serialize_res[:serialize_size]
         finally:
-            free(serialize_res.ptr)
+            free(serialize_res)
+
+    cdef unsigned char* digest(self, unsigned char *data, size_t data_size, size_t *digest_size):
+        cdef ossl.EVP_MD_CTX *ctx = ossl.EVP_MD_CTX_new()
+        if ctx == NULL:
+            raise MemoryError()
+        cdef const ossl.EVP_MD *algo = ossl.EVP_sha256()
+
+        cdef:
+            unsigned char* digest
+            size_t dig_buff_len
+            unsigned int digest_len
+
+        dig_buff_len = <size_t>ossl.EVP_MD_size(algo)
+        digest = <unsigned char*>malloc(dig_buff_len * sizeof(unsigned char))
+        ossl.EVP_DigestInit_ex(ctx, algo, NULL)
+        ossl.EVP_DigestUpdate(ctx, data, data_size)
+        ossl.EVP_DigestFinal_ex(ctx, digest, &digest_len)
+
+        digest_size[0] = dig_buff_len
+
+        ossl.EVP_MD_CTX_free(ctx)
+
+        return digest
+
+    cdef unsigned char* perform_hash_c(self, size_t *digest_size):
+        cdef:
+            unsigned char *serialize_res
+            size_t serialize_size
+            unsigned char *digest
+
+        serialize_res = self.bytes_serialize_c(&serialize_size)
+        digest = self.digest(serialize_res, serialize_size, digest_size)
+
+        return digest
+
+    cpdef perform_hash(self):
+        cdef:
+            unsigned char *digest
+            size_t digest_size
+
+        try:
+            digest = self.perform_hash_c(&digest_size)
+            self.BlockC.hash = bytes(digest[:digest_size]).hex().encode("UTF-8")
+        finally:
+            free(digest)
+
+        return self.hash
+
 
 
 
@@ -234,7 +289,7 @@ cdef class Blockchain:
         self._chain = new unordered_map[uint64_t, Block*]()
         if self._chain is NULL:
             raise MemoryError("Could not allocate hasmap")
-    
+
     def __init__(self, *args, **kwargs):
         pass