And transferring your coins to different keys.
The subpoena isn't "for all keys, and no using them on the blockchain". It's just for the data. There is no such thing as ownership of bitcoin.
That’s like arguing that there is no such thing as ownership of land. (Which some have argued, but it is a bit tenuous.)
I would guess that I still own it. In the same way, you still own the bitcoin until someone else does.
