Bitcoin Forum

I need a private key restorer.

AFAIK there are no tools that do this. You will have to make one yourself.

Bitcoin Address
1EHNa6Q4Jz2uvNExL497mE43ikXhwF6kZm
Bitcoin Address Compressed
1BgGZ9tcN4rm9KBzDn7KprQz87SZ26SAMH


Public Key (130 characters [0-9A-F]): 0479BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798483ADA7726A3C 4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8
Public Key (compressed, 66 characters [0-9A-F]): 0279BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798

Private Key WIF
51 characters base58, starts with a '5'
5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf
Private Key WIF Compressed
52 characters base58, starts with a 'K' or 'L'
KwDiBf89QgGbjEhKnhXJuH7LrciVrZi3qYjgd9M7rFU73sVHnoWn


Private Key Hexadecimal Format (64 characters [0-9A-F]): 0000000000000000000000000000000000000000000000000000000000000001
Private Key Base64 (44 characters): AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAE=

OP and you:
I'm curious: how did you do this?
5 digits isn't that much, so an altered version of vanitygen could brute force it in seconds. But do you just happen to have that lying around?

you can do it at https://www.bitaddress.org/
but it will take you a long time to exploit all the feasible solution.
about 570000 possibility withe these five missing letters  :'(
good luck

So how did you do it in 20 minutes? It would be a nice trick to have if I ever need it.

I have not done it in 20 minutes but 2 seconds ;D.                                                                                                                                   
because all the private key are numbers from 1 to 115792089237316195423570985008687907853269984665640564039457584007913129639935 (this privat key: ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff or 5Km2kuu7vtFDPpxywn4u3NLu8iSdrqhxWT8tUKjeEXs2f9yxoWz as WIF), and the numbers of this key is just 1                                                                               

I could probably throw together a C program that would do this for you.  Do you have the ability to compile and run a C program?

If not, I might also be able to put together something in node.js

Compile this code: http://pastebin.com/S8WARrRn

This code is for address with 5 unknow "-" chars!!

First set your address to 58. line, and compile the code (you need openssl dev installed, apt-get install libssl-dev):


run it ( ./recovery ), and stop with ctrl+c, you got 5 "index: XX" lines.

Modify the "define C_X_INDEX" lines in the code (line 49-53). Compile again.

Run again and wait, get a coffee, or 10.  :D

I've got it running, to test :)

When it says Test: 1A, it's searching for the all possibilities on the 3 dots that start with A1, until it stops at Tz.
5HpHag-65TZ-G1PH3CSu63k8Dbp-D8s5ip-nEB3kEsreAnc-uDf
5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf
That makes it a bit slower than vanity gen, doing 62^3=238328 keys in 2 seconds. Vanitygen does 3 times more, but uses both 2 cores.

Edit:
Test: Tx...1.986084s
Test: Ty...1.994141s
Test: Tz...
FOUND: 5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf

Thanks! I will keep this program, I may need it someday.

"Test 1A" means: testing this privkeys: 5HpHag165TZAG1PH3CSu63k8Dbp*D8s5ip*nEB3kEsreAnc*uDf
there are 58*58 (=3364) so groups, with your cpu (~2 sec/testgroup) you get the result about 2 hours.

i dont know vanitygen, how do you run it to test this keys?

No problem.

I'll put something together this weekend and test it for a few days next week to see how good I can get the performance.

In the meantime if you find another copy of your private key, or manage to remember what the values were, just let me know so I don't waste time on it.

Thanks. I edited my post the same time you posted this.
You say 58 where I assumed 62. I didn't realize until now the private key excludes the same characters that are excluded from the address.

Vanitygen searches random private keys until it finds an address with a certain prefix. Example: 1Loyce.
Annoyingly, it segfaults since I've (re)installed libssl-dev.

elbandi already posted a working program.

Top guy DannyHamilton is, one of the best here. OP you are lucky to have found a poster who is willing to do this for you.

Anomgst all the bull shit & scamming that goes on here it's good to see there are some good people here.

Great code, works fine alas only with uncompressed private keys.

Would it be possible to write similar program to work with compressed ones ?

Sure, here is the universal version: http://pastebin.com/gPzBp6u3

it recognize the compression type from the first char.

if the first char is a missing char, you have to set the compression type by manual (compressed = 0; or compressed = 1;)

tips are welcome: 1JsU1mfK3qxC37JoFiVhvi3KoA7ceUaMrZ  ::)

guys i have Etherium private key was saved in notepad accidently my kids press some alphabet and first 20 digits missing and i have saved it without notic can anyone please help me to recover if its possible

20 characters missing!!?! :o :o :o

Your chances of being able to recover that in a 'timely' manner are pretty much zero... that's nearly 1/3 of the 64 hex characters making up a private key... and something ludicrous like 16^20 permutations... 1208925819614629174706176 to be precise. :o :o :o :-\

Unfortunately not.
You would have been able to restore a few chars, but definitely not 20.

By the way, if you don't have an offline backup (not stored on your computer), you don't have a backup at all.
Any incident affecting your computer (electrical short, ransomware, .. ) could have lead to a loss of the private key.

Storing a backup on the same device as the wallet is not a backup at all.

Was your private key saved in a file before your kid fucked it up? If that's the case, you may be able to restore an earlier version of said file; and with some luck, it will contain the whole privkey.

I wrote a Java tool that can do that, but 20 characters are impossible in her lifetime.

https://github.com/MrMaxweII/repairPrivKey

https://user-images.githubusercontent.com/34688939/75074392-dc6ee100-54fb-11ea-8273-e5a6f540dee7.png

If your key was reused then it's possible to recover it. Then the time complexity is only 2⁴⁰, which is doable in 15 minutes on a V100 GPU.

Reused key means you sent coins from it, and know the public key.
Or if you signed anything and have the signature.

hi!  :)
How to run this tool ?
What a version of java need install?

It should run with any Java version. https://java.com/de/download/

It is then started with a double click on the .jar file.   https://github.com/MrMaxweII/repairPrivKey/releases/download/V1.3.1/repairPrivKey.jar

You could try these guys https://keychainx.io