Bitcoin Forum

What?
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 (https://en.bitcoin.it/wiki/Split-key_vanity_address), which prevents me from ever seeing your private key.

Instructions
These are based on ones provided by LoyceV (https://bitcointalk.org/index.php?action=profile;u=459836) and shorena (https://bitcointalk.org/index.php?action=profile;u=181801).

1) Go to https://www.bitaddress.org/ (https://www.bitaddress.org/) move your mouse/type in the field until it shows 100%, then wait a few seconds. Optionally (but recommended), you can download (https://github.com/pointbiz/bitaddress.org/archive/master.zip) 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 https://www.bitaddress.org/ (https://www.bitaddress.org/).
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.

Disclaimer
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.

Donations
1woukheyeacxfpxtpkxjqxureevdkbywj (https://blockchain.info/address/1woukheyeacxfpxtpkxjqxureevdkbywj)

I'll take an all uppercase address. Here is my step1 public key:

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


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

Thank you for this great offer to our community, I would take an all uppercase address, my public key generated is:

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


PrivPart (WIF): KzhVUATVxF2F8tbEu9Czv11goAxu7JTRTdeN3W4zg4acsC8hzujT
Address (WIF):  1KT1C2KR3B5JP5GPL3MUEYN8RX8HWQ59L5

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.


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.

Hey, I'm willing to test this.
My public key: I'd like no uppercase if possible. Great service, thanks :)

Here you go - note that free addresses include numbers.


PrivPart (WIF): L2efeyFyo9GSLx4nMAaGvFZfHzSjteji2mKW37F1xMtQMsD6TttU
Address (WIF):  18N4ZDALQKXM3ZJM5MN9SDLAN68H62B5YV

Enjoy:

PrivPart (WIF): L3FjLMHdrhXpyay2tVWVsd9VrRGdA6VsWBKFTjDDupWH44cm3bA5
Address (WIF):  14o4jqes322wpeogy6vedg8h6g8e3akxxe

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.

Thank you very much, this generates a private key which I did paste in 'wallet details' page.
Now I have 2 addresses, right? One compressed and one uncompressed (both of them look valid in blockchain search)
I tried signing a message with both of them and works, thanks.

I went through all the steps and got my address imported. Still looks like a typical address until you look closely, wish there were less numbers ::)
Thank you and good luck with your business.

048A5A61AF738926A080B59D17EB17B7F89B539FA5BDD2AA90E536970D8560C85C393B15ACAB7C2 97003FAE6D18CED548E226D37BC236AAA4FC66276ECAA05C65D

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

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

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.

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

Some people like such things. If you don't, that's fine by me.

thanks

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.

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.

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: https://en.bitcoin.it/wiki/Split-key_vanity_address#Address_generation_outsourcing

A few other references:

https://bitcoin.stackexchange.com/questions/3853/can-one-safely-buy-vanity-addresses-from-a-third-party-without-risking-ones-coi

https://bitcointalk.org/index.php?topic=81865.msg901491#msg901491

hello can you make me one address for all upper
here the public key

04A362CF469C642A4A87EE2061D2B3285A1D9AEA20DF69A7D10B2737E183E52A3431CD9605518AF803E9427747FEFB71B813C436DED9FFDFD7A653804FFE016457

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
Address (WIF):  1DW35YNCSBVXRDJU6LWZWER87K8R7RTZ94

PrivPart (WIF): L1vbzLPUCu3Y4RyWugs8gMpYFpR4z55wBPJXaHLEUYNPs25Q1yK8
Address (WIF):  18czvpo7iwy8eeb4w4wgtkf7pndg8k54k3

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.

How long did it take for you to generate the address with only lowercase letters and no numbers, and what kind of specs did the AWS instance have?

You're referring to 1woukheyeacxfpxtpkxjqxureevdkbywj? I spent about a day and a half on that address with several dozen instances of various sizes.