Private Key (hex) From Root Key (xprv)

convert root private key to private key hex (sha256)

on this example first generated mnemonic with 12 word (size=12) and after that convert mnemonic's to Root key (xprv) , next convert root key to private key hex with 64 character (SHA256)

import Blockthon as block

# generated random mnemonic with 12 word [size=12]
mnemonicWords = block.getMnemonic(12)
# convert mnemonic words to xprv (root key)
xprv_string = block.Mnemonic_To_RootKey(mnemonicWords)
# convert root key xprv to private key hex 64 sha256
privatekey = block.PrivateKey_From_RootKey(xprv_string)