LoyceV there might be something in this brainwallet thingy. The address is wrong but maybe i copied without last/firs 2 digits. I've also made note "p:" instead "private key" or "secret" as it is on bitaddress. There are 3906 combinations that would meet this criteria  *2 (compressed or not). It there a script that I could feed with dictionary to check this?

It's not HEX
It's alfanumeric big and small letters.  No special characters (like = / ?) 
It also doesn't have i I and 0, and O (seems it's also a distinc characteristic somewhere but that can be coincidence).
Coult it really be some altcoin? Is there some wallet that has them all and would recognize it if it's actually this?

Copying altcoin key instead of bitcoin seems like a stupid mistake but who knows  I was quite young 7 years ago.

Thanks for instant reply guys
I downloaded bitaddress.org for offline use and  in wallet details shows it's not a valid private key. I guess I might have used BIP38 encrypt with aditional password. How to verify that?

Hi,
In late 2013 I generated wallet most probably with www.bitaddress.org. I saved id and secret (private key?) . The address is 34 characters long and blockchain.com show it's base58 (p2pkh) format and shows some  small balance.
Now I have  secret (afaik - private key?) that is 64 characters long starts with nV... .   Bitaddress.org won't recognize this as a proper private key, nor can I import it to wallet (tried electrum). With ID I can import it but it's view only.

I'm pretty sure i copy pasted the key.

So I guess my question is am I doing something wrong? Maybe I didn't copy/paste some characters.  Is 64 char private key valid lenght? Is it possible it's not a key but some kind of hash etc. and I have to decode it first to use?

thx