I don’t exactly know what it is but it has to do NFTs
What is treasure chess?

I linked my account to it but I don’t know what it is. Can someone tell me what it is
https://support.chess.com/article/3719-what-is-treasurechess-how-do-i-use-it

What is an NFT?
Non-interchangeable unit of data or for short non-fungible token

What is an NFT?
I asked my son that very same question. He gave a very typical answer, for him anyway. He said it's like the static rotator on your car. Don't try to understand it, just accept it.

I asked if we can use it to pay premium membership, nobody answered. BTW I don’t think you can pay premium membership with Bitcoin or can you ? 1 Bitcoin costs $40000!
It's not obligatory to buy an entire bitcoin. You can totally own a fraction or portions of it.
Like if the current cost of 1 Bitcoin is $40000, you can purchase 0.1 Bitcoin for $4000! So you can pay for a membership with Bitcoin or other cryptocurrencies if you'd like.
https://support.chess.com/article/2017-how-can-i-pay-with-cryptocurrency
I linked my account to it but I don’t know what it is. Can someone tell me what it is