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21  Bitcoin / Bitcoin Discussion / Re: Rare address hall of fame on: January 27, 2017, 04:07:47 AM
18 leading digits, a new record. I actually found this several months ago but didn't notice, lol.

2017-01-16 controlled by ryanc
22  Economy / Services / Re: no upper/no lower address giveaway on: January 23, 2017, 11:02:27 PM
Few ideas for some more typical bitcoin address :
Is it possible to have a bitcoin address with no alphabets ? If not what is the possible minimum count for alphabets like this addy 1111111111111111111114oLvT2

- address with no alphabets 1nnnnnnnnnnnnnnnnnnnnnn
- address with minimum alphabets at the end : 1nnnnnnnnnnnnnnnnnnnnAa
- address with minimum alphabets at the beginning : 1aAnnnnnnnnnnnnnnnnnnnn
('n' can be any number).

In principal, it's possible to generate a bitcoin address that is all numeric, but the compute cost would be trillions of dollars.

An address with 17 leading digits has been done (I have 15375934619214243fGk3c5abbwcyVsBVM, for example), and I suspect making one that's at least 23 digits total (with some letters interspersed) is possible.
23  Bitcoin / Bitcoin Discussion / Re: About Collision on: January 23, 2017, 06:18:09 PM
This should probably be watched by anyone who wants to use a brainwallet: DEF CON 23 - Ryan Castellucci - Cracking CryptoCurrency Brainwallets. He even posted an update (not entirely sure if the account is genuine):

Ryan Castellucci 6 days ago
The current release of brainflayer is much faster than what I released at DEFCON. Currently, it's only $40 to check 1 trillion passphrases on AWS, which works out to 25 billion per dollar.

Yes, that youtube comment is from me.

a trillion pass phrases. thats only:
9 alphabet characters deep
8 alphanumeric characters deep
7 alphanumericsymbol characters deep

When cracking passwords, exhaustive search with a character set is the last thing one tries. Breaking weak passwords and passphrases dozens or characters long or more is common with the proper tools.
24  Economy / Services / Re: no upper/no lower address giveaway on: January 23, 2017, 02:44:02 PM
Here is my public key:


and would like to ask for a uppercase and a lowercase both.

If you use both, do not import them into different wallets.

PrivPart (WIF): KzN3jy9UcWZ6Tox6y7Shmfx6cHJUnsdRvzN5cWHog3ggTa3vozhu

PrivPart (WIF): L1vbzLPUCu3Y4RyWugs8gMpYFpR4z55wBPJXaHLEUYNPs25Q1yK8
Address (WIF):  18czvpo7iwy8eeb4w4wgtkf7pndg8k54k3
25  Economy / Services / Re: no upper/no lower address giveaway on: January 23, 2017, 05:05:51 AM
hello can you make me one address for all upper
here the public key

PrivPart (WIF): KwHNMDZQzt4Pa9Ho4gjphNY615t6BUkZ9amkJafZcCBKS7jCSqhb
26  Economy / Services / Re: no upper/no lower address giveaway on: January 23, 2017, 04:40:41 AM
how secure is this op I now it in too part but if hackers get hold of one side they might find away round this is yo program that u use 100% hack proof as doing this might put you wallet at risk it a good idea o make it easy to remember but letting a third party in on the security of you wallet is a bit risky I think

I don't recommend using more than one address that's been generated with split-key using the same public key, but in general this is quite safe. People have been using it to securely generate vanity addresses for years.

There's a link describing this in my post - repeating it here for convenience:

A few other references:
27  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 11:16:08 PM
I guess I will satisfy myself with an uppercase address then. No need if you are trying to make it ready just that I had requested. Anyway curious about the software you developed. Also mind telling me what is the difficulty of such addresses ( I mean one you are doing it right now) and power you are having.

The difficulty for all lowercase, no numbers except for the leading 1 is about 1.16x1013, and for all uppercase, no numbers except for the leading 1 is about 2.81x1012. I do the computation on AWS. The software is based on libsecp256k1. The free addresses will all have numbers mixed in.

I am not sure what the difficulty is for the addresses with numbers mixed in, but it generally takes me under a minute to create those.
28  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 10:34:26 PM

Can you do me an address without no. and has all lowercase letters included just like you have for donation?

That kind of address takes a lot of processing power to generate, so you'd have to pay for that. I'm not quite ready to do that yet, but when I am it will be several hundred dollars worth of BTC. If you're interested, I can PM you when I'm ready.
29  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 08:22:33 PM
So you are taking from $200 up to $500 just for an address including no numbers except the 1 at the beginning? then we must do a large transaction for it to worth the money lol. I want an address with prefix ImHash and will get it from loyce for free.

Some people like such things. If you don't, that's fine by me.
30  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 08:20:38 PM
048A5A61AF738926A080B59D17EB17B7F89B539FA5BDD2AA90E536970D8560C85C393B15ACAB7C2 97003FAE6D18CED548E226D37BC236AAA4FC66276ECAA05C65D

hm... both types are cool but I would prefer uppercase

is it possible to buy all lowercase, too? If yes how much?

Here you go. Please be aware if you use both of these addresses, the private key for one can be computed from the other. I don't recommend importing them into different wallets.

PrivPart (WIF): KzSLbfZCV1Phcd58c1uPn6zHvcEyfptVWgDeaADxWA4G1KVCafB1
Address (WIF):  1L2WSWYRALLLHH2VE7363W26CPLGA9514N

PrivPart (WIF): L2eqKpHUnDVzDiYEdNMiJSDEe2Cy8H1H9nNmys7vu1kMXM9NA6Mh
Address (WIF):  1yj8aucj7sbpdm2spfbj7v984sh4revfr
31  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 07:05:52 PM
Thank you, sorry If i sound like a noob but I am getting another address, I pasted the private key in the first field and in the second field the part PrivPart generated from you.
Vanity Bitcoin Address: 1LJ4mCnxas7SZUfSLVQYprpeE6FAfxLxJP, there is something wrong but I can't find where.

The Vanity Wallet tool generates "uncompressed" addresses, but I'm finding "compressed" addresses because it's a little faster and they result in smaller transactions with lower fees. You have to convert to compressed format using steps 8 and 9.
32  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 06:59:47 PM
Hey, I'm willing to test this.
My public key:
I'd like no uppercase if possible. Great service, thanks Smiley


PrivPart (WIF): L3FjLMHdrhXpyay2tVWVsd9VrRGdA6VsWBKFTjDDupWH44cm3bA5
Address (WIF):  14o4jqes322wpeogy6vedg8h6g8e3akxxe
33  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 06:53:42 PM
Thank you for this great offer to our community, I would take an all uppercase address, my public key generated is:


Here you go - note that free addresses include numbers.

PrivPart (WIF): L2efeyFyo9GSLx4nMAaGvFZfHzSjteji2mKW37F1xMtQMsD6TttU
34  Economy / Services / Re: no upper/no lower address giveaway on: January 22, 2017, 06:52:14 PM
I'll take an all uppercase address. Here is my step1 public key:

Edit: Any chance I could get an all uppercase & and all lowercase?

Per the free offer, these do have numbers sprinkled in:

PrivPart (WIF): KzhVUATVxF2F8tbEu9Czv11goAxu7JTRTdeN3W4zg4acsC8hzujT

PrivPart (WIF): L3gJUkoM97hvbMX9Co7mouRQfjjMMwp6ebTsa2veUoEici94LP3s
Address (WIF):  1942t5fx93in6emv9ibdd4cz9xcnt4ewrk

Please note that the full private key for either address can be used to compute the private key for the other.

Any idea roughly what it would cost for an all lowercase/uppercase letter address? I might be interested.

Probably the BTC equivalent of $100-$200 for all uppercase except for the leading 1 and $300-$500 for all lowercase except for the leading 1. Those prices are estimates based on testing I did (which is where my donation address came from), I would need to actually do the math on my costs before taking orders.
35  Economy / Services / no upper/no lower address giveaway on: January 22, 2017, 06:18:57 PM
Want an address that has no upper case letters (e.g. 184wwh1dtg8xv858d1n1ktj2cpvvbjugft) or no lower case letters (e.g. 1GNGTB96XPDHQ47Y6SNP8KN3YNPLFUP6B8)? I can do that - for free. I have some custom software that lets me do this a lot faster than vanitygen.

Is this safe?
Yes. I do split-key address generation, which prevents me from ever seeing your private key.

These are based on ones provided by LoyceV and shorena.

1) Go to move your mouse/type in the field until it shows 100%, then wait a few seconds. Optionally (but recommended), you can download the code, verify the signature, and run it offline.
2) Click "Vanity Wallet", then click the "generate" button to make a keypair.
3) Save your private key somewhere safe.
4) Reply to this thread with your public key, and whether you want "all letters uppercase" or "all letters lowercase". Addresses will still include numbers.
5) I'll reply with your "part private key".
6) Go back to the "Vanity Wallet" screen on
7) Under Step 2, paste your private key in the first field and the part private key in the second, then click "Calculate Vanity Wallet".
8) Copy your "Vanity Private Key".
9) Click "Wallet Details", then paste your "Vanity Private Key" into the box and click "View Details". Your address will be under "Bitcoin Address Compressed" and your final private key under "Private Key WIF Compressed". Import it into your wallet.

Can I choose a prefix?
No. I may offer this for a fee in the future.

Why is this free?
I'd like to offer some high end address generation services, such as all upper case and all lower case letters (except the leading 1) in the future (please PM me if interested). Before I do that, I want to make sure there are no issues with the process.

I may stop or change the terms of this giveaway at any time, and I reserve the right to refuse service to anyone for any reason. This service is offered without warranty of any kind.

36  Bitcoin / Legal / Re: Bitcoin Attorney Will Answer All Questions: on: January 18, 2017, 12:45:28 AM

I do Bitcoin research that involves attempting to crack keys that were generated with non-standard tools (e.g. I am curious as to your opinion on the following:

* What law(s), if any, would be broken if I were to used cracked private keys to take the Bitcoin for myself? To be clear, I don't believe this would be ethical, and wouldn't do it even if it didn't break any laws, but I'm nonetheless interested in the legal aspects.

* Would it be legal to create a transaction with the coins in an attempt to alert the owner, provided I paid the fees for such a transaction myself and the transaction kept the coins in the same address? If not, what law do you believe this would violate?

* Would it be legal to move the coins into an address I control, then make a good faith effort to find the rightful owner? If so, what would be appropriate to require in terms of verification? What happens if the rightful owner cannot be found for a long time?

* Is there any way to get standing to have a court to rule on any of this without exposing myself to criminal prosecution?

My current MO is not to touch any coins I find private keys for and avoid publishing the keys, and I'm not going to change that unless I get a really solid opinion from a lawyer in my state that says I can.
37  Bitcoin / Development & Technical Discussion / Re: Brain wallet, step-by-step guide (FIXED!) on: December 20, 2016, 05:35:13 AM
You can't fix stupid, not even with key-stretching.

True, but you can mitigate it, at least to some extent. I probably should try getting WarpWallet to accept my patches again.
38  Bitcoin / Development & Technical Discussion / Re: Brain wallet, step-by-step guide (FIXED!) on: December 20, 2016, 04:00:56 AM
Someone put 250BTC on that address, that was hacked by a white hat hacker, who tried to warn the owner (and did not simply take the coins, yes, people like this exist) by adding more and taking it back, but the owner did not notice, so the hacker traced the owner to a mining pool, and found the owner's phone number, and called to explain...this lengthy story was presented during a DEFCON conference.

That was me.

Quote from: ArcCsch
I think brain wallets should be strengthened by salting, and by using key-stretching, as in BIP38, this would make hacking all but the weakest passphrases totally impractical.
With this post, I request from software developers to include a new brain wallet generator, with separate boxes for passphrase and salt, and with some heavy key-stretching to slow down those hackers.
Something like this:

WarpWallet does something like that. Using it with a salt and six diceware words (use actual dice!) should be sufficient unless you're Satoshi. I still strongly recommend against coming up with your own password or passphrase, and BIP39 + BIP32 is better for a number of other reasons.
39  Bitcoin / Development & Technical Discussion / Re: Brain wallet, step-by-step guide (FIXED!) on: December 20, 2016, 02:13:58 AM
Now, please prove me wrong.

You're using math that assumes people generate their passphrases or passwords randomly. It is possible for people to do this. A small number of them do. The problem is that, as every database leak that's included hashed passwords has shown, the vast majority of people choose weak passwords. This is a problem, since brainwallets automatically leak what amounts to a hash immediately on use.

So yes, I believe that most people are not capable of choosing a password or passphrase that is sufficiently strong to use as a brainwallet, and there is a mountain of evidence to support me. This is not a matter of ego. I would not feel comfortable in my ability to come up with a password or passphrase that could not be cracked without a secure random number generator. Is it really so hard to believe that I, and others like me, genuinely want to help prevent people from losing money?

I am not saying "it's impossible to create a brainwallet that won't be cracked". My argument is that so many people are not able to evaluate whether their passwords or passphrases are strong enough that assisting them in creating a brainwallet is an act of gross negligence.
40  Bitcoin / Development & Technical Discussion / Re: Strong brain wallet, step-by-step guide. on: December 19, 2016, 05:36:41 PM
I was asked by someone to comment here, since I wrote brainflayer and have coauthored two papers about brainwallet cracking.

I am really surprised by the collective refusal of brain wallets. It all started roughly two years ago when suddenly a secret society of crypto guys started a war on brain wallets ... including popular ones like that I have used thoroughly back then.

Haven't I seen you posting in the past about cracking bitcoin keys? Hard to tell, since you've tried to purge your old posts, but your motivation here is highly suspect.

What motivation do you think us "crypto guys" have for trying to prevent people from using brainwallets, other than to save people from themselves?

This "research" paper does not say how many bitcoins they have collected as the result of cracking brain wallets.

You didn't read the paper, then. Threads on bitcoin talk where people are bragging about cracking brain wallets are listed. Hundreds of BTC have been taken.

I have personally had correspondence with people who have lost over 100BTC due to forgetting their brainwallet passphrase. I spoke on the phone with someone who lost about 47k ether from a brainwallet.

If someone wants to store bitcoin using a memorized secret, they should use BIP39, optionally combined with BIP32, and use spaced repetition to memorize the seed.

If you absolutely insist on coming up with a passphrase yourself and storing bitcoin with it, go use WarpWallet with your email address, name, or phone number as a salt. It's several orders of magnitude more secure against cracking, and multiple independent implementations of the algorithm exist.

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