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1  Bitcoin / Development & Technical Discussion / Bitcoin math question on: December 19, 2019, 03:49:37 PM
Bitcoin transaction formula question.
If k is the nonce, it goes through the same pattern to become the R value as the private key does to become the public key, right? k * Gx = R
So if I take a k value and input it into for example bitaddress.org (or any other software for that matter) like it was the private key, the first part of the public key is supposed to match the R value of my transaction? (minus the 04 at the beginning)
But I don't get this value. Am I missing something?
2  Bitcoin / Development & Technical Discussion / Bitcoin and SageMath question on: December 12, 2019, 10:56:43 PM
I was reading up on Bitcoin formulas, but I cannot get this one to work in SageMath.
This was supposed to be for related nonces and I was trying it with my own transactions.
c = k2-k1 where c is the difference between the two nonces.

p = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141
K = GF(p)
K((r2*z1)+(r1*s2*c)-(r1*z2))/((s1*r2)-(s2*r1))

Doesn't come up with the right result! It's supposed to give me k1.

This one works fine: K((z1*s2 - z2*s1)/(r*(s1-s2))) for repeated R's.

Did I mess up the formula or SageMath? Or everything together?  Angry Ugh! It bugs me. Thank you for any constructive thoughts.


3  Bitcoin / Development & Technical Discussion / Tool to search the whole Blockchain? on: December 10, 2019, 03:54:48 PM
I often read about someone scanning the blockchain scripts and signatures, but I am unable to find a specific tool.
How would I go about, for example, if I wanted to search the whole blockchain for a specific r or s signature? For Windows preferably.
Bitcoin blockchain explorers won't go into the details of transactions and usually offer only tx, address or block search.


4  Bitcoin / Development & Technical Discussion / Bitcoin weak transaction nonce question on: December 06, 2019, 12:34:09 PM
I finally have some free time to dive deeper into bitcoin studies, so I have a question (or two maybe).
I read an article about lattice attacks when a bad k (nonce) is used. I found some addresses in which the signatures (s part) start with the same bytes, is that a sign that an address has been using a weak nonce?
If the same r is used (exact same nonce) in different transactions, then the formula for calculations would be K((z1*s2 - z2*s1)/(r*(s1-s2))).
What would it be, if the same s is re-used in the formula, but the r's are different?
5  Bitcoin / Bitcoin Technical Support / Constructing bitcoind for non-standard txs on: December 18, 2018, 09:20:38 PM
Hi, I have a question.
I followed Max Kaye's guide to compiling bitcoin for non-standard transactions.
Used the same version of bitcoin as his guide does,  made the necessary changes, compiled from source...and still bitcoin-cli gives me
"error code: -26
error message:
bad-txns-nonstandard-inputs (code 64)"

The only two files his guide states to change is the standard.cpp and /rpcrawtransaction.cp.
Is his guide inaccurate or am I missing something?

Thanks in advance for the help.
6  Economy / Economics / Exchange market data manipulation bringing the whole crypto market down? on: September 08, 2018, 09:20:30 PM
Hi guys,
I was investigating the recent market plunge and this is my two cents as to why the crypto market is experiencing this situation.
Some people were tying this to the fake news about Goldman Sachs crypto desk plans change, but I think this is due to an exchange faking data.
The news that BitForex is faking data came around auguest 26th. Now this is what can really be happening on the market.
An exchange lists fake data about the price dropping rapidly, then it buys the real crypto at the discount price (knowing that the price is "fake") on other exchanges.
After this, the same exchange spams fake data the other way around and sells the currency at the real or overvalued price = profit!
Today Coinmarketcap states that BitForex ethereum volume is  $1,090,589,986, which is 40% of the whole market.
I do not see a real economic situation in which this can be true.
The question is when will such hoax schemes of market manipulation stop?
Really, coinmarketcap was such a trusted source of market data and now this is just a very sad situation. What do you think? What are your speculations about the recent price changes?

   

7  Alternate cryptocurrencies / Altcoin Discussion / Bitcoin math vs. altcoin math on: May 21, 2018, 08:14:58 AM
Bitcoin is a highly informative coin with all the math explained in detail. The formulas are all available online, there are even resources that calculate the s, r and z from any transaction, so anyone can verify that the math works. Unfortunately, altcoins do not always provide such information. I was looking at zerocoin protocol and I was not able to find the link between the data in the transactions and the formula for the protocol, which is supposed to be c = gs hr (mod p) where c, g, h, p are supposed to be a part of the transaction. The github resources were also uninformative about how the signature contains these values, neither is google. How would one go about finding this connection? There are lots of coins using the protocol, but nobody explains how transaction decoding works.
8  Alternate cryptocurrencies / Altcoin Discussion / Zerocoin protocol math question on: May 20, 2018, 10:25:49 AM
Ok, as I understand it, zerocoin protocol is also based on math just as much as bitcoin. The formula is supposed to be c = gs hr (mod p) where c, g, h, p are known. When a zerocoin mint transaction occurs, it produces a signature 4 x 64 bytes. However, I am not able to find which part of the signature correlates to which number. The github coding annotation is also not helpful, as the noting of the signature says = params, coin, coin commintment, mhash. Could anyone please clarify me on this issues? I would like to understand how the math works behind the zerocoin protocol on my own transactions.
9  Economy / Trading Discussion / Arbitrage websites? on: March 17, 2018, 06:04:30 PM
I have googled, searched and searched and I have yet to find a good arbitrage app or website, where I could exchange crypto not only on one exchange, but also between them as well in an easy manner. Would someone point me in the right direction? For example, I would like to change my BTC from Bitfinex to Poloniex to trade it to ETH there, and then move ETH to Bitfinex and all that within five minutes in one App. Anyone help?
10  Alternate cryptocurrencies / Altcoin Discussion / Geth remote connection question on: February 20, 2018, 06:29:56 PM
Hi, is there anyone who is good with Geth remote connection?
Ok, so I set up my geth console like this
--rpc --rpcport "8545" --rpcaddr "127.0.0.1" --rpccorsdomain "*"
After that I should be able to connect from a remote machine using my IP, right?
Like this
geth --rpc attach http://my.ip.add.ress.:8545

I get an error:
Fatal: Failed to start the JavaScript console: api modules: Post http://my.ip.add.ress.:8545: context deadline exceeded

What am I doing wrong?
11  Other / Off-topic / Cryptokitties and gems on: February 15, 2018, 02:59:08 PM
Anyone playing this? I own a few cryptokitties and now there is a new feature - gems. I have a question about the gems, they don't seem to be tied to cattributes, it is just a visual for each cat-trait +or-? For example here: (some random kitties off the market)
https://www.cryptokitties.co/kitty/253803
and here
https://www.cryptokitties.co/kitty/516560

both have cloudwhite cattribute, however one has a gem with it, and the other one doesn't.
What do they actually do? I have not been able to find a good guide for this  Sad
I guess the devs like adding new features without actually explaining them thoroughly. There is also no search option in the market to search kitties by gems, am I correct? So like I want a cat with all gems, there is no way to find it without actually accidentally stumbling upon it in the big array on the markets?
This kitty game gets weirder and weirder everyday.

12  Bitcoin / Development & Technical Discussion / Question about a very old wallet on: February 11, 2018, 02:53:21 PM
Hi, my friend asked me this question today. Way back he set up one of the first bitcoin clients, which generated coins. He generated a bitcoin genesis transaction, however it never synchronized with the network, maybe due to his firewall. The transaction of generating the coins never made it to the network, so this transaction is useless now, right? There is no way to write it into the network, and no way to reclaim those coins, am I correct?
13  Bitcoin / Development & Technical Discussion / Pushing a non-standard tx on: November 18, 2017, 05:02:48 PM
Hi, I am wondering if there is a a place out there to push a tx with non-standard inputs. The transaction is fine, no double-spending, the script sigs are all good, however I cannot seem to find a place to push it to the network. Please help  Huh There used to be Eligius to do this, however it does not work now and I dont have a referral code to f2pool. The others dont seem to work with non-standard txs.
14  Bitcoin / Development & Technical Discussion / What? New type of bitcoin adresses??? on: September 28, 2017, 02:45:42 PM
I was browsing through blockchain today and I noticed new - weird looking adresses like this bc1qdl753ur9ucwa3cgfrud2nqvu7k69dykk3cwwx6g64a5szn3xw92sp8mc7a.
What type are these??? How would you create transactions with those? They are some sort of witness adresses? Each address has a private key, the ones start with 3 have 2/3 private keys, what type of a private key would have this one? Are they more secure? I'm sorry I could not find any information online, maybe someone could direct me to a new manual on this  Smiley
15  Bitcoin / Development & Technical Discussion / Very first "bitcoin-0.1.5.rar" on: September 23, 2017, 05:39:53 PM
Hi,
I have been looking all over the internet to find that very first bitcoin release "bitcoin-0.1.5.rar" with bitcoin.exe.
Can't find it anywhere! If anyone has the original file, would you please please please please very very please send it to me!
Thank you  Smiley
16  Bitcoin / Development & Technical Discussion / Bitcoin vulnerability script? on: September 07, 2017, 09:09:54 AM
Hi,
I have been thinking about investing a sum of money into bitcoin, so I have been reading about its vulnerabilities. As I understand, blockchain sometimes gives repeated R-values which makes some bitcoin wallets vulnerable to hacks. I wanted to find a tool to scan for such vulnerability, but seem to find none. I found R-scan, unfortunately it does not run under Windows, and I tried to run it in pythonanywhere, but to no success. Is there a tool to do this in Windows? Is there a tool to do this for the whole blockchain, so there is some output script like this http://www.want2pay.com/bad_randoms_bitcoin.html ? Please help, I want to make sure I can search for the vulnerability myself, instead of waiting for someone else to post it when its too late. Thanks in advance for your help!
17  Bitcoin / Development & Technical Discussion / No tool to convert json to hex? on: August 18, 2017, 06:53:17 PM
I wanted to ask, why is there no tool to convert json format of transaction into hex? Why not? Is it that difficult to implement?
For example, I want to edit my transaction by hand, instead of going through it from some program step by step.
There is a decode hex to json on blockchain, why is there no tool to reverse this process? I'm a bit new to bitcoin, so please don't be mad if I'm asking a stupid question, I was just curious.
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