Error al pasar o empaquetar archivo .py a .exe (python a .exe)

Trato de empaquetar .py en .exe con pyinstaller de la siguiente manera pyinstaller --onefile script.py pero obtengo un error relacionado con un archivo .dll, he intentado cargar el dll que esta en la misma carpeta que script.py de la siguiente manera pyinstaller.exe -F --add-data "./libsecp256k1.dll;." script.py pero no lo toma, sigue arrojando el mismo error, alguna sugerencia o ayuda para poder resolver el error seria de gran ayuda para mi; Gracias de antemano.

El codigo que intento empaquetar de .py a .exe es el siguiente.

from coincurve import PublicKey

print("Probando python")

Uso la libreria de python llamada coincurve pip install coincurve

Este es el archivo .spec que me genera pyinstaller.

# -*- mode: python ; coding: utf-8 -*-

block_cipher = None


a = Analysis(('script.py'),
             pathex=('C:\Users\CCP\Desktop\1'),
             binaries=(),
             datas=(('./libsecp256k1.dll', '.')),
             hiddenimports=(),
             hookspath=(),
             runtime_hooks=(),
             excludes=(),
             win_no_prefer_redirects=False,
             win_private_assemblies=False,
             cipher=block_cipher,
             noarchive=False)
pyz = PYZ(a.pure, a.zipped_data,
             cipher=block_cipher)
exe = EXE(pyz,
          a.scripts,
          a.binaries,
          a.zipfiles,
          a.datas,
          (),
          name='script',
          debug=False,
          bootloader_ignore_signals=False,
          strip=False,
          upx=True,
          upx_exclude=(),
          runtime_tmpdir=None,
          console=True )

Este es el error que me genera al ejecutar el .exe que se creo con pyintaller.

C:UsersCCPDesktop1dist>121
Traceback (most recent call last):
  File "121.py", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "c:usersccpappdatalocalprogramspythonpython37libsite-packagesPy
Installerloaderpyimod03_importers.py", line 489, in exec_module
    exec(bytecode, module.__dict__)
  File "site-packagescoincurve__init__.py", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "c:usersccpappdatalocalprogramspythonpython37libsite-packagesPy
Installerloaderpyimod03_importers.py", line 489, in exec_module
    exec(bytecode, module.__dict__)
  File "site-packagescoincurvecontext.py", line 4, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "c:usersccpappdatalocalprogramspythonpython37libsite-packagesPy
Installerloaderpyimod03_importers.py", line 489, in exec_module
    exec(bytecode, module.__dict__)
  File "site-packagescoincurveflags.py", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "c:usersccpappdatalocalprogramspythonpython37libsite-packagesPy
Installerloaderpyimod03_importers.py", line 489, in exec_module
    exec(bytecode, module.__dict__)
  File "site-packagescoincurve_libsecp256k1.py", line 239, in <module>
  File "site-packagescffiapi.py", line 150, in dlopen
  File "site-packagescffiapi.py", line 832, in _make_ffi_library
  File "site-packagescffiapi.py", line 827, in _load_backend_lib
OSError: cannot load library 'C:UsersCCPAppDataLocalTemp_MEI46962coincurv
elibsecp256k1.dll': error 0x7e.  Additionally, ctypes.util.find_library() did n
ot manage to locate a library called 'C:\Users\CCP\AppData\Local\Temp\_MEI
46962\coincurve\libsecp256k1.dll'
(4380) Failed to execute script 121

C:UsersCCPDesktop1dist>