couple questions about PoS for programmers

[Mahmoud70]

as i know the Proof of stake is about staking an amount of specific coin in the network so it can make decisions what's gonna be in the next block
can I develop a code that I could use this amount of coins while it's under Mortgage?
could I develop a  blockchain code that you can stake whatever coin you have?

[NeuroticFish]

as i know the Proof of stake is about staking an amount of specific coin in the network so it can make decisions what's gonna be in the next block
can I develop a code that I could use this amount of coins while it's under Mortgage?
could I develop a  blockchain code that you can stake whatever coin you have?

I'm not 100% sure that this is what you need, but maybe you can check for LPOS (Leased PoS), WAVES has that. Maybe you can mix PoS with LPoS and other whatever-PoS got invented meanwhile.
But I've never looked into the code of any PoS, so I don't know...

[bitmover]

as i know the Proof of stake is about staking an amount of specific coin in the network so it can make decisions what's gonna be in the next block

Not exactly.

You do not take decisions about the next block.

You say that those transaction you put inside that block are valid and you put you coins at stake. Like a bet. If there are invalid transaction there, you lose those coins. This is why it is called proof of stake.

You cannot make decisions like you suggested. You are staking, not deciding anything.  You can decide what tx goes inside your block and which doesnt, but your "decision" power dies there.

YOu can read more here:
https://eth.wiki/en/concepts/proof-of-stake-faqs