Your question is somehow complicated and understandable cause I have never read where Bitcoin has a state and it will be appreciated if you can be more specific with your question for better understanding. But if you're referring to where Bitcoin is stored, it is store on Keys and the keys come in 2 pairs.
I was reading ETH whitepaper & this caught my attention:
"The "state" in Bitcoin is the collection of all coins (technically, "unspent transaction outputs" or UTXO) that have been mined and not yet spent, with each UTXO having a denomination and an owner (defined by a 20-byte address which is essentially a cryptographic public keyfn. 1)."
Then, further in the whitepaper [about the ethereum] he talks about Patricia tree & adds:
"Additionally, because all of the state information is part of the last block, there is no need to store the entire blockchain history - a strategy which, if it could be applied to Bitcoin, can be calculated to provide 5-20x savings in space."
then i thought what is the mechanism of checking the states if they're not in the block? I've never thought of it before & I believe i need to read a bit more about chainstates.