Fetch my private key
Let's suppose I have lost everything except this extended master key. How can I setup a new fresh computer and retrieve all my bitcoins just with this key?


According to How to get xpub or mpk(bip32) for my bitcoin core wallet?


  you can export the xpriv with dumpwallet 


According to https://bitcointalk.org/index.php?topic=3866008.0


  Bitcoin Core does not have a way to directly import [master] private keys.
  You could derive a bunch of private keys in WIF from the xpriv and import them all at once, but you can't import the xprv directly.