It is the view in another forum that seed phrases were not available in the early days, this is not true. -snip- What’s the main view about this on this platform?
I'm not aware of any year-2009 client that exported a form of seed phrase before BIP39 is drafted (
the standard seed phrase we use now),
The earliest I know is late 2011 Electrum's old seed phrase consisting of 1626 possible words but isn't limited to 5 letters.
Blockchain may had used a different backup phrase but that was a backup of the account's WalletID and Password, not something to restore the private keys.
Are you on GitHub? I would definitely hire you to assist me. Or I’m willing to meet up with someone with the skills to do this task in or around the London area, of course after we’d agreed on some T&Cs.
You'll have better chance if you collaborate with reputable old-timers who actually used the very old versions.
But no matter how reputable they are, do not send your private key, master private key or seed phrase to them.
I know my statements above are bold, but this is all I will divulge for now so I’m curious about the reaction from stating what I know to be a fact.
Based from the provided info, it seems like this isn't limited to old Blockchain(
dot)info.
And to be honest, I see this topic is burdened with vague information you recalled from different wallets and tools from different timeframes.
If you're looking for the other clients that you may have used, you can post a separate topic in "
Bitcoin Technical Support" board (
https://bitcointalk.org/index.php?board=4.0) to see other members' ideas.
Include the description and examples (
same format, different characters) of your backups.