Fetch my private key I goal is to understand. I do not want to earn money with mining.
(I have a server without GPU)

Here is what i've done:

I have downloaded, maked and installed bitcoin sourcecode from github.

It seems to work because i can interact with bitcoind with bitcoin-cli command.

I know this is not a good practice but i want to "see" my private key.

I have read several documentation and tutorials and they said i need to generate an address first, then call dumpprivkey method.

Like this:

$ bitcoin-cli getnewaddress
xxxxxxx

$ bitcoin-cli dumpprivkey xxxxxxx


I do not understand but if i repeat twice this operation, i get 2 differents private keys.

So this is not the private key i am looking for... What is those privates keys ?

Thanks
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.