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Author Topic: Recovering 33 character private key from legacy blockchain.info wallet  (Read 120 times)
operator55
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November 23, 2019, 06:46:00 AM
Last edit: November 23, 2019, 07:14:26 AM by operator55
Merited by hugeblack (1)
 #1

Hi guys

I'm totally stuck trying to recover very old wallet from blockchain.info (likely V1). I've searched entire web using keywords coming from json file but no luck.
Perhaps some expert developer who is aware of security algos can advise me on this case.

- I got password to the wallet but no email access, therefore this file is all what i have.
- If "priv" field is encoded, i can try to decode it with the password - but i need to be aware of tech specification for this "priv" field.
- Wallet is from 2013.
- My note on the backup says "wallet for bitcoin-qt client", not sure if this is true. It doesnt look fit for bitcoin-qt at all.

Problem is that i cannot restore or extract the private key from this file.. it's very weird, i heard it's base58 + some custom implementation.
This is the wallet file and i have no total clue how to decode this. The private key is very weird, it's just 33 characters. Is it even valid?
The "addr" points to correct BTC address, therefore is fully valid.


Code:
{
"guid" : "020XXXX-XXX-8fXX-bc6c-XXXXX17XX",
"sharedKey" : "XXXXXX-69XX2-157f-XXX4-XXXXXX083",
"options" :
{
"pbkdf2_iterations":10,
"fee_policy":0,
"html5_notifications":false,
"logout_time":600000,
"tx_display":0,
"always_keep_local_backup":false,
"transactions_per_page":30,
"additional_seeds":[]
},
"keys" :
[
{"addr":"1MHJxxxxxxxxxxxxxxYMwR","priv":"uNKxxxxxxxxxxxxxxxxxxxxxxxxxxxBfM"} (33 characters private key)

]
}

{"addr":"1MHJxxxxxxxxxxxxxxYMwR", (34 characters valid address) "priv":"uNKxxxxxxxxxxxxxxxxxxxxxxxxxxxBfM"} (33 characters private key)

Is anyone aware what is "priv" key format for this wallet?
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nc50lc
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November 23, 2019, 07:46:54 AM
 #2

- My note on the backup says "wallet for bitcoin-qt client", not sure if this is true. It doesnt look fit for bitcoin-qt at all.
Yes, that looks like a wallet.aes.json file from blockchain.info.

This thread have the info of old and new private key types: [overview] Recover Bitcoin from any old storage format]
But there's nothing about a 33-character prv key.

Have you tried to drag-n-drop it to their import wallet page (https://login.blockchain.com/wallet/import-wallet)?
Said, it supports blockchain.info wallet files.

operator55
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November 23, 2019, 12:22:25 PM
 #3

Yes, i have tried doing using blockchain import tool.

Doesn't recognise the file.

Although the last transaction i remember on the wallet is from 2013, it could have been created even earlier. (2011-2013)
Therefore some legacy privkey format could have been used.



- My note on the backup says "wallet for bitcoin-qt client", not sure if this is true. It doesnt look fit for bitcoin-qt at all.
Yes, that looks like a wallet.aes.json file from blockchain.info.

This thread have the info of old and new private key types: [overview] Recover Bitcoin from any old storage format]
But there's nothing about a 33-character prv key.

Have you tried to drag-n-drop it to their import wallet page (https://login.blockchain.com/wallet/import-wallet)?
Said, it supports blockchain.info wallet files.
DannyHamilton
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November 24, 2019, 02:48:39 AM
 #4

It's been a long time since I've looked at a wallet.aes.json file, but 33 characters doesn't seem long enough to me.  Hopefully, I'm wrong.  Have you tried this yet?

https://github.com/blockchain/my-wallet-backup-decryption-tool

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November 28, 2019, 04:40:31 PM
Merited by hugeblack (1), nc50lc (1)
 #5

Yes, i have tried doing using blockchain import tool.

Doesn't recognise the file.

Although the last transaction i remember on the wallet is from 2013, it could have been created even earlier. (2011-2013)

What file name did you use when dropping the file? I know blockchain can behave weird if you dont name the textfile exactly wallet.aes.json

/KX

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