Topic: Bitcoin Wallet generation by hand - page 3. (Read 6760 times)

The dice method is great!!! Now I can be sure that my key is a really good key with almost 0 chance of collision

Wouldn't a ripemd160 and sha256 function for the calculator be sufficient? I would assume you can do the rest by hand.

.5 btc bounty for a program that will hash working bitcoin addresses and works on a TI-83+

it should also generate private keys using user inputed entropy such as the dice mentioned earlier

One of the TI-84s or should may be able to do it.  (With custom programming, probably.)

would a pocket calculator make it any more feasible ?

Absolutely impossible unless you are god
https://bitcointalksearch.org/topic/m.3081885

...I was not serious, but thanks man!

Loads of rep to you.

It does look nearly impossible, though if you generate it by hand (because its the best random number generation possible) and then get the public key on an offline machine then you should be fine.

paid the bounty, now how can i get a public key with not using a computer, nearly impossible I gather?

Where?

Topic: Bitcoin Wallet generation by hand  (Read 207 times)


PROTIP: The private key is super easy to calculate compared to the public key complexity: https://en.bitcoin.it/wiki/Technical_background_of_Bitcoin_addresses

http://i.imgur.com/f1zd9uE.png

No, but he offered the bounty for just the private key.

Is this the public key you obtained from the private key you posted? How did you do it on paper?

http://cs.ucsb.edu/~koc/ccs130h/notes/ecdsa-cert.pdf
http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf

I was only talking about hashes though, you could follow this post:


If you are REALLY motivated you can do it in a few days I think

@jackjack,

Yep.  So I guess that answers all this.  Its not possible to create a public key without some form of computer.

@str4wm4n,

Technically I still fulfilled the requirements for your bounty. My address: 1Hd9sBNf8Z892jRGgrTzL9EuVUEhjfJvVc

 

You want to play with semantics?

Ok, let's play.

Let's take a human, the super-hero kind, who can:
 a/ Calculate a 32-bit operation in 10 seconds
 b/ Work from midnight to midnight everyday
 c/ Calculate a 32-bit operation without any errors

A hash takes about 5000 32-bit operations. So make it 10000 for ripemd160(sha256()).
That makes (10*10000) = 100k seconds = 38.4 hours = 1.6 day non-stop.
Possible.

Now here comes the fun.

---

This time we take a real human, the super smart kind.

A/ He calculates a 32-bit operation in 30 seconds (please try a 32-bit addition and tell me how much time it took)
This raises the total time to calculate one hash to 115.2 hours

B/ The guy must sleep, so he can "only" work from 8am to midnight.
This makes the total time to calculate one hash equal to 4.8 days.
Still possible.

C/ The lower brain failure rate in the best conditions is 5%. As he's super smart his is only 1%.
The probability of him finding the correct hash on one try is P = 1/2^(100000*1%) = 1/2^1000 ~ 1/10^300

D/ He starts the hashing calculation at birth and will stop at 100 years old.
This is (100*365) = 36500 days of calculation.
One try is 4.8 days, so he has 7604 tries available.
The odd of our super smart guy FINDING AT LEAST ONCE the correct hash in his entire lifetime is then:
  R = 1-Q where Q = (1-P)^7604 = ( 1 - 1/2^1000 )^7604

Basic maths gives that Q > 1 - 7604/2^1000 = 1 - 10^(-297.149) > 1 - 10^(-297)
So R < 10^(-297) < 1/2^986
Yes, R < 1/2^986

---

TLDR

It's easier to crack 6 different bitcoin addresses with only 6 guesses than to a human to calculate a correct bitcoin address hash in his lifetime
Yes, I call that impossible

nice! do you mind trying to work through some more things such as public key?

Bounty noted.  I am actually working on it right now.

EDIT: Okay, I am ready to claim.  Since you said private key, and not a WIF key or public key, its actually pretty easy.

Here is the method, which requires two dice or any other randomizing method.  Roll the two six sided dice 64 times.  Right down the numbers like this:

If the number is 0-9 right now the number.  If the number is 10-12 right now a-c.  Do this with each roll of the dice and you will get a valid hex private key, such as A9 87 3C 79 B6 D8 70  A0 1B 61 57 78 63 33 89 B4 45 32 13 30 3A A6 1C 20 CC 67 2C 23 36 B3 32 62

This is a valid bitcoin private key.  Note that this does not use all the hex characters, and as such can not generate all possible private keys, but its easy to do with just two dice.

You could also buy a 16 sided dice or something and use 0-F which would be more proper.  If you do it this way, the max address you can use is FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFE BAAE DCE6 AF48 A03B BFD2 5E8C D036 4141

I am offering a 1btc bounty for someone who can demonstrate a repeatable method for calculating a private key using only paper pencil and brain

Well only the public key needs to be hashed to create an address. You can safely type the public key into a computer to obtain an address.

All you need to do by hand is obtain a private key and derive the public key, NOT calculate the hash.