Thanks for your reply merelcoin.
The wallet that held the bitcoins seemed to just disappear, so not only can I not access the wallet, but I don't even have the address.
Or are you referring to the original address on Armory? The physical location of Armory and the old wallet would be on an old laptop, which I still have, but cannot access. I might be able to dig out the address though, as I did keep most codes and keys.
It might help if I explained what I have here, which I thought was the private key - there are 4 lines of text, and each line has 9 x four letter sequences. Each 4 letter sequence separated by a space.
Does that make any sense?
So basically,
you have no info about the lost blockchain.info wallet. You don't know your identifier, your password, the address,.... But you do know you just exported your key from armory and imported it in blockchain.info. So it's rather useless trying to recover your blockchain.info credentials, this only leaves the route i proposed: try to re-export the private key and import it in a different (desktop) wallet like core or electrum.
You say you have a private key consisting of 4 (lines) * 9 (blocks) * 4 (letters per block) = 144 letters. Or maybe those are 4 private keys consisting of 36 letters.
There are several formats to export your private key in. I'm not an expert, so i looked at
https://en.bitcoin.it/wiki/Private_key and
https://www.bitaddress.org/bitaddress.org-v3.2.0-SHA256-ad4fd171c647772aa76d0ce828731b01ca586596275d43a94008766b758e8736.htmlI don't see a format that contains 144 characters tough, neither do i see one that contains 36 letters. Like i said: i'm not an expert on this, so maybe somebody else knows a private key format that is consistent with your description?
Maybe it's an armory backup instead of a private key export? I know that if you create a paper backup from armory, standard, you get 4 fragments (maybe those are your lines?) each fragment is a piece of ascii text divided in groups of 4 letters (sounds familiar???). It might be worthwile to reinstall bitcoin core + armory on your new pc and try if you can recover your wallet with those 4 lines??? What do you have to lose (exept time, diskspace and bandwith)
Is there any chance you can get the physical files from the disk of your old laptop? 12
BTC is more than $8.000 at current rate. It might be best to contact goatpig and see if he can give you some tips and tricks on how to handle this?
To tell you the truth, i haven't used armory in a really long time (don't have it installed on my pc either), so i'm defenatly not an expert in this. If i were you, i'd try to find out if those 4 lines are a fragmented backup, maybe try to salvage the original harddisk, try to boot into the old laptop and generate a fresh private key export (like the link in my previous post), and if those two options don't work: try contacting goatpig and see if he's willing to help you out.
Good luck!
EDIT: rootkeys!!!!!! I just remembered: an armory rootkey is represented as 2 or 4 lines containing 9 blocks of 4 ascii characters!!!http://www.bitcoinarmory.com/tutorials/armory-basics/restore-wallet/I guess the chance is pretty good you have 1 or 2 rootkeys, so you can create a new armory wallet on a new pc, wait for it to sync, click restore -> single sheet backup -> 4 lines backup -> paste your rootkey...