Question regards Seed phrase

[breyvin]

hello



i have a question.


i have an old blockchain.info/com wallet from around end of 2013 beginning of 2014.

Back then i received a 12 seed phrase - so i checked 2 random words if they are listed in the BIP39 word list, and they do!


So my question is, if my seed phrase is now universal - meaning it can be imported on electrum for example, or did blockchain info back then used another kind of seed phrases, and they used the same word list from BIP39 just with another customizeation ( sum-check ) ?


And  if so , since when did they start to use universal seeds?

[safar1980]

https://www.reddit.com/r/Electrum/comments/udc2a7/can_you_recover_a_blockchaininfo_wallet_with_a/?rdt=44162
So if you create a blockchain.com (not info) wallet today, then it is BIP39 complaint. But if you created the blockchain.info wallet back in 2012 it would not be BIP39 complaint.
They switched to BIP39 / BIP44 compliance somewhere between 2012 and 2022.

Blockchain.info officially switched to the standard 12-word BIP39 seed phrases in late 2015/early 2016 with the launch of the third version of the wallet (V3 HD Wallet).
https://bitcointalk.org/index.php?topic=1357661.0

[hosemary]

Blockchain.com started to generate 12 word BIP39 seed phrases in 2016.

So my question is, if my seed phrase is now universal - meaning it can be imported on electrum for example, or did blockchain info back then used another kind of seed phrases, and they used the same word list from BIP39 just with another customizeation ( sum-check ) ?

If you have an old blockchain.com seed phrase, you can't import it into other wallets.
If you have a new blockchain.com seed phrase, you can inport it into many other wallets including electrum.

Blockchain.com used a different wordlist before their 2016 upgrade and generated seed phrases using their own algorithm.

[Cricktor]

OP, I'm not sure if you tried to use the forum search, but I knew from memory where roughly to look at (took me a little searching to find LoyceV's recovery thread which I knew exists):

...
Seed phrases, Word lists or Mnemonic phrases
Bitcoin wallets can be stored as seed phrases, usually 12 to 24 words long. The used words can be in several languages (thanks HeRetiK).

• ...
• Blockchain.info: To recover an old legacy Blockchain.info wallet, read this topic and go here.
• Blockchain.info: In some cases, Blockchain.info (now .com) shows a compressed private key while the address was uncompressed. Read this topic.
• ...

...

It is possible that you could find more topics that deal with the recovery of old mnemonic words wallets from blockchain.info. Newbie accounts have some limits with usage of forum search. I suggest to use https://bitlist.co/search to search this forum.

From above cited snipet it sounds like you would need your "wallet recovery mnemonics" (17-word recovery phrase). Do you have something like that?

[NotATether]

Blockchain.com used a different wordlist before their 2016 upgrade and generated seed phrases using their own algorithm.

If the word list has been posted in public somewhere, it should not be too difficult for someone to make a "blockchain to bip39 translator" that just maps each blockchain.com word to the bip39 word for that same position.

I would be surprised if nobody has made such a tool or some other form of blockchain.com recovery software.