It is clear that Bitcoin does not work the way you think it works.  I don't know what altcoins you've created, or what that altcoin code allows you to do with keys, however:

• Bitcoin Blocks do not have Private keys OR Public Keys
• Each Bitcoin Block DOES have a generation (aka coinbase) transaction, that transaction may, or may not have one or more private keys.
• Having any private keys to an address in a generation transaction allows you to spend any bitcoins still associated with that address EXCEPT in the case of the genesis block.
• In Bitcoin, there are NO keys that allow anyone to "control the chain". That's just straight-up nonsense.
• It is possible to have a nonce, without any keys. Every Bitcoin block has a single nonce that is used to create a unique HASH but is NOT used for any key (public or private).
• The only value used in generating an ECDSA signature that might be called a nonce is the k value.  However, this is typically just called the k value and not usually referred to as a nonce.

You are spewing a lot of nonsense, and asking questions that don't make any sense at all.  It is clear that you need to understand the basics of Bitcoin better before you work on asking detailed questions about the technical details of Bitcoin's implementation.