lol

That's exactly what I thought

I'm trying to implement the base58 functions.  I'm almost there but I have difficulties with the checksum.

Yes it is.  Thanks.

Feel free to use the code source of my own exchange page   !

Isn't DER format the same as raw byte ?   Anyway I opened an other thread and Hal found out that the key has a "ASN.1 cruft" or something.  So I add to add a tail -c 64.

I have to read about this ASN thing.

Thank you !  You want the 50 BTC ?

PS oh sorry I hadn't seen you bitcoin address in your signature.


Paiement done
23a76591017b364bc3e9ee4a8cf0a317d1a1dfa571190b5caf91c1b9a647747e

Hi.  Might be a bit longer I'm afraid.  Probably friday.

If you're french please post on the french thread and tell us about yourself.  We are especially interested in learning how people find out about bitcoin.

I'm in Paris too and I bought my first bitcoins with bitcoin4cash.com.  It worked like a charm.

I've recently implemented a similar service.  Checkout my signature.

*** EDIT:  bounty has closed.  Hal won it. ***

I've tried to make one but I've failed, so I start an other bounty.

dirtyfilthy has made a C program which exports a wallet's private key to a openssl readable PEM format.


So given a bitcoin address such as :

btc=1Hy9dexzNzjvQYkYy6zKRVZMU8k2j5vuPt


I can run :

bc_key $btc ~/.bitcoin/wallet.dat |
openssl ec -pubout

Which gives me a public key :

-----BEGIN PUBLIC KEY-----
MIH1MIGuBgcqhkjOPQIBMIGiAgEBMCwGByqGSM49AQECIQD/////////////////
///////////////////+///8LzAGBAEABAEHBEEEeb5mfvncu6xVoGKVzocLBwKb
/NstzijZWfKBWxb4F5hIOtp3JqPEZV2k+/wOEQio/Re0SKaFVBmcR9CP+xDUuAIh
AP////////////////////66rtzmr0igO7/SXozQNkFBAgEBA0IABJJ6TBhmiWm4
Y1ACBVJVn0oyG9Ay5IzEZq8cPyrs1PERl963YQh5UrGOT0NodynfHswkz8bUpaJW
FsowR/l9wXc=
-----END PUBLIC KEY-----


Now I need a program that reads this public key, and ouputs the corresponding bitcoin address.

Such a program exists in the bitcoin code.  I think it's the function "PubKeyToAddress" in base58.h.

I want to implement this function in bash, using only openssl et standard filters.

As I understand it, I have to do the following steps :

- computes the sha256 of the key ;
- computes the rmd160 of this hash ;
- add a byte at the begin for the version number (?) ;
- add four bytes at the end for the check sum ;
- encode the result in base58 ;




I've tried using blockexplorer.com/q/hashtoaddress for the last three steps.  This gave me this code :


wget -O - -q http://blockexplorer.com/q/hashtoaddress/$(
grep -v 'PUBLIC KEY' <<<"
-----BEGIN PUBLIC KEY-----
MIH1MIGuBgcqhkjOPQIBMIGiAgEBMCwGByqGSM49AQECIQD/////////////////
///////////////////+///8LzAGBAEABAEHBEEEeb5mfvncu6xVoGKVzocLBwKb
/NstzijZWfKBWxb4F5hIOtp3JqPEZV2k+/wOEQio/Re0SKaFVBmcR9CP+xDUuAIh
AP////////////////////66rtzmr0igO7/SXozQNkFBAgEBA0IABJJ6TBhmiWm4
Y1ACBVJVn0oyG9Ay5IzEZq8cPyrs1PERl963YQh5UrGOT0NodynfHswkz8bUpaJW
FsowR/l9wXc=
-----END PUBLIC KEY-----" |
base64 -d |
openssl dgst -sha256 |
cut -d\  -f2 |
xxd -r -p |
openssl dgst -rmd160 |
cut -d\  -f2
)


But it just doesn't give me the correct bitcoin address.

50 BTC for whoever fixes that.

Hum... I used your tool to extract the private key from one of my bitcoin address :


1Hy9dexzNzjvQYkYy6zKRVZMU8k2j5vuPt

I obtained this public key (using conversion with "openssl ec -pubout -in privkey.pem") :

-----BEGIN PUBLIC KEY-----
MIH1MIGuBgcqhkjOPQIBMIGiAgEBMCwGByqGSM49AQECIQD/////////////////
///////////////////+///8LzAGBAEABAEHBEEEeb5mfvncu6xVoGKVzocLBwKb
/NstzijZWfKBWxb4F5hIOtp3JqPEZV2k+/wOEQio/Re0SKaFVBmcR9CP+xDUuAIh
AP////////////////////66rtzmr0igO7/SXozQNkFBAgEBA0IABJJ6TBhmiWm4
Y1ACBVJVn0oyG9Ay5IzEZq8cPyrs1PERl963YQh5UrGOT0NodynfHswkz8bUpaJW
FsowR/l9wXc=
-----END PUBLIC KEY-----

(no, I won't paste the private key here )

Anyway, I need a tool to check that this public key (assuming it is not mine, it's just an exemple) is indeed the one of the bitcoin address 1Hy9dexzNzjvQYkYy6zKRVZMU8k2j5vuPt

For some reasons I can only do that in bash.

So I try this :




However I try, I never manage to confirm the initial bitcoin address.


What do I get wrong ?

I am definitely interested.  However, I don't need it right now but at some point I will.

I hope you will maintain this offer when I need it.

Do those cards work outside of US ?  If you don't know, please tell us who is the issuer so that we can check on their website.

Ok just give me some time to analyse the code, because such a code reads my wallet so obviously I have to be carefull


PS.  Well, this looks perfectly fine, and I've tested it with success.

I kind of regret I put such a high price for a program that small, but I have only one word. 

Paiement is done :
13f9f65532c012ebcc5073fd670c9edc8c73ab449e5821150c0f4822c35ae33d

Yeah I like the "Red shield" idea.  Pretty clever.

Capital is made of means of production :  companies, tools, knowledge, machines,...

Bitcoin doesn't make capital, just as it doesn't make orange juice.  It only permits you to buy it.

I have only watched the few first minutes but I wanna be the first to say :

THIS KICKS ASS !!


PS.  I think this video is one of the best, along with the Hayek/Keynes rap.

Yeah right, I forgot about loom too.  Beat me.

Let's just say I want my own implementation

And I want it in bash.

A short video would be better, in order to better evaluate how many people could have seen the sign, and during how long it was visible.

(a photo could have been shot in 1 sec and then the sign would have been removed).

I'm on IRC right now if you want to talk.

Yeah I'll definitely look into it.

It requires OpenSSL version 1.0.0, which is quite a high version number.  I'm on debian Sid and I only have version : 0.9.8o-4.

The 1.0.0c is on debian experimental, though.  I'll have to install it.