tl;dr - "vijay"
All I want is to have single unique id, to use it for my BTC transactions, like this above link, that would return my then current bitcoin address (or whatever I set).
And yes, this would make all my transactions "nonymous", but that's ok with me.
https://blockchain.info/tags
This is another way to implement what I was asking for. now I can't casually own and use single bitcoin address forever, but this solves my problem in a different way.
If allowed to retag, I can associate my tags with new addresses. I think, that's not possible now, and it is only blockchain.info specific.
Interestingly blockchain.info allows to tag multiple addresses with the same tag name.
This is not the same as offline / frozen addresses, but I can use new address everytime.
but, firstbits was so cute..