Create master public key after HMAC-SHA512 I have that result after hash_pbkdf2

5B56C417303FAA3FCBA7E57400E120A0CA83EC5A4FC9FFBA757FBE63FBD77A89A1A3BE4C67196F57C39A88B76373733891BFABA16ED27A813CEED498804C0570




left 256 bits are:

5B56C417303FAA3FCBA7E57400E120A0CA83EC5A4FC9FFBA757FBE63FBD77A89


in base 10 are

m = 41313771436092106966070828753784402438291933698697412643075684398900444625545


right 256 bits are

A1A3BE4C67196F57C39A88B76373733891BFABA16ED27A813CEED498804C0570


in base 10 are

G = 73111678085084231450767103284505018606851115862905010375565411946552667932016


To calculate Master Public Key I have to do

m*G

bc &lt;&lt;&lt; “73111678085084231450767103284505018606851115862905010375565411946552667932016 * 41313771436092106966070828753784402438291933698697412643075684398900444625545”


result 

3020519157716314193817478999423070077945694756523017007189820738431399197829981163447928137705627795431573290757393848092663806903883822516032876636948720


that result is not correct
m*G
  
  bc &lt;&lt;&lt;
  “73111678085084231450767103284505018606851115862905010375565411946552667932016
  * 41313771436092106966070828753784402438291933698697412643075684398900444625545”


Careful, G is a secp256k1 elliptic curve generator point. You cannot multiply it as you would a scalar. You need a secp256k1 library to perform scalar x EC-Point operations.