All Questions

Filter by
Sorted by
Tagged with
4 votes
1 answer
1k views

Ripple Distributed Consensus Algorithm

What kind of a Consensus Algorithms does ripple use? Is that a leader or leaderless distributed consensus algorithm? Then what?
tdumidu's user avatar
  • 379
1 vote
1 answer
131 views

Transaction verification up to coinbase?

Do full nodes verify the entire transaction chain up to coinbase when verifiying a single transaction to be included on the block which they are working on ?
perencia's user avatar
  • 178
3 votes
1 answer
824 views

What causes a "stuck block"

I've seen and heard about issues where a coin's network would get 'stuck' at a specific block. I understand why it would get stuck due to high difficulty and low hash, but some coins seem to be ...
Tuaris's user avatar
  • 93
4 votes
1 answer
267 views

What made the old versions of the bitcoin wallet insecure?

According to the downloads for the Bitcoin client, versions older than ~0.3.0 were "insecure". Since they are not available for download (and the lack of security is the given reason) no one can ...
Mine's user avatar
  • 1,406
10 votes
2 answers
733 views

Why don't developers switch from bitcoin-qt to a cleaner implementation?

The "reference client" bitcoin-qt receives a lot of complaints from developers on the messy way it was coded. It seems to require a big overhead to learn, and a lot of time is being spent on ...
Winslow Strong's user avatar
0 votes
0 answers
529 views

How do you do point multiplication in bitcoin associated with the ecdsa algorithm?

I have posted a similar question recently, but not this specific. I have found that a lot may ride on the idea of "point multiplication" yet all explanations I have found lack explanation or are in ...
Mine's user avatar
  • 1,406
3 votes
2 answers
633 views

What are the limits of ASIC Mining?

My assumption is that ASIC miners optimize for the "hashes per joule" metric, as did GPU miners over CPU miners. It would seem that after some time, the decision to mine Bitcoins would be based on if ...
locksley's user avatar
1 vote
0 answers
126 views

Altcoin apps stealing hashes?

It was super cool to discover so many alt coins have cloned the Bitcoin Wallet Android app, however I noticed that the phone started running unusally hot after installing all the coin apps, even when ...
Mark's user avatar
  • 1,679
2 votes
1 answer
137 views

Double spending race attack first transaction

In tackling double spending, does the protocol enforces that only the first transaction (and by first i mean the first transaction to be send to the network) is considered as valid ?
perencia's user avatar
  • 178
2 votes
2 answers
3k views

destination_tag best practices when integrating Ripple [closed]

I'm integrating Ripple with a commerce system, to accept payments to a Ripple wallet. My understanding is that the destination_tag, an integer, is the only data I can use to track a transaction. I ...
Dave Cohen's user avatar
0 votes
1 answer
130 views

How can I limit the mining to specifics miners authentified by private key or something like that?

I know how to code in C++, but I don't know really how all mining system works. I have my altcoin, and I would like to block reward blocks to miners which are not authentified (something by private ...
Raito's user avatar
  • 111
5 votes
3 answers
402 views

Bitcoin value vs. Supercomputing

What protects the stability of Bitcoin's value if supercomputers or some other technological breakthrough allows them to be mined at rates we have not anticipated?
Erich's user avatar
  • 51
7 votes
1 answer
489 views

What was the vulnerability in v0.3.4 that allowed an attacker to steal coins?

Reference: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-5141 What was the specific exploit in the Tx script evaluation process?
pinhead's user avatar
  • 5,124
14 votes
3 answers
8k views

What is a step by step way to insert data in OP_RETURN?

I was following https://bitcointalk.org/index.php?topic=453086.0 for creating a message in OP_RETURN. I am able to decode my raw transaction, but on signrawtransaction it gives error: {"code":-22,"...
wizgot's user avatar
  • 333
3 votes
1 answer
265 views

What is the right way to create a MultiSig?

After following https://github.com/wobine/blackboard101/blob/master/wbn_multisigs_pt2_spend-funds.py for creating a MultiSig, I end up with a Multisig address. On Validate Address it shows as valid ...
wizgot's user avatar
  • 333
0 votes
2 answers
158 views

Class action suit against Mt. Gox?

This NY Times article says a Chicago law firm is representing Mt. Gox customers in a lawsuit against that company. I had a small about of bitcoin in a Mt. Gox account. The law firm has not contacted ...
Michael Hardy's user avatar
0 votes
3 answers
70 views

How could a large owner of Bitcoin give back to the Bitcoin community in an equal way?

If there was one large owner of Bitcoin, for example somebody who owned 3% of all mined Bitcoins, would there be a way for that person to give back their Bitcoins in an equal way? I'm thinking more ...
Trautlein's user avatar
3 votes
3 answers
168 views

If most G20 nations ban bitcoins, would that effectively kill bitcoin?

If the G20 nations (or most of them) ban bitcoins doesn't this effectively kill bitcoin? My thinking is that a normal person would no longer have any means of converting bitcoins to the local currency....
jti107's user avatar
  • 31
1 vote
1 answer
131 views

Curious about a network-based double-spending attack

In their paper Two Bitcoins at the Price of One? Double-Spending Attacks on Fast Payments in Bitcoin, Karame and Androulaki outline a particular race-attack that involves the slight control over a ...
Max's user avatar
  • 11
6 votes
1 answer
661 views

"Fidor to integrate Ripple protocol", what does that mean?

On Monday Ripple Labs announced that Fidor Bank AG will be integrating the Ripple protocol later this year. Has somebody found concrete statements what this will entail? Will Fidor Bank AG only ...
Murch's user avatar
  • 75.1k
4 votes
1 answer
431 views

Mini-Blockchain proposal: How is the proof-chain secured against injections?

I have just finished reading the paper Purely P2P Crypto-Currency With Finite Mini-Blockchain by J.D. Bruce. While I got the impression, that the rolling blockchain as an idea might work, I was left ...
Murch's user avatar
  • 75.1k
2 votes
2 answers
290 views

op_return regex search

Is there a webservice around that allows one to search the OP_RETURN data on the blockchain? More precisely: I'm looking for a service that would return the transaction ids of transactions that ...
user15677's user avatar
1 vote
1 answer
307 views

Why does bitcoin use public keys as pseudonyms?

Why does bitcoin use public keys as pseudonyms? Is there any reason for that? What are the advantages of using public key as the pseudonyms? Highly appreciate if someone can give me an answer.
tdumidu's user avatar
  • 379
9 votes
2 answers
975 views

Can the blockchain be outpaced by a chain of low-difficulty blocks?

Let's say someone creates a blockchain fork starting from the genesis block, when the difficulty was absurdly low compared to today; then he starts mining new blocks from there up to the current block ...
Massimo's user avatar
  • 1,058
1 vote
1 answer
149 views

How to store/export coins from bitcoind to papper wallet 'cold storage'

I have bitcoind 0.9.1 installed on my VPS debian server. I would like to store my coins via "cold storage", on paper wallets. I read some articles over internet, but i don't know which one is usable/...
Nagy Ervin's user avatar
1 vote
1 answer
602 views

Do receiving addresses expire on Multibit?

Okay so I have tried Resetting Blockchain and Transactions plenty of times. The only thing is I used an old receiving address that I used about 2 months ago. Do these addresses expire? Can they only ...
Joshua Schell's user avatar
-1 votes
1 answer
2k views

How can I transfer my Bitcoins from Coin Cafe to my local MultiBit wallet?

I recently purchased a fair sum of bitcoins through Coin Cafe. My transaction went through without a hitch and my coins are sitting in an online wallet given to me through their site. I chose MultiBit ...
Mike's user avatar
  • 1
8 votes
6 answers
7k views

API for converting currency such as Euro/USD to BTC

Basically what I'm looking for is a reliable API that allows for the conversion of an imputed currency amount such as USD/Euro amount and a conversion would be made that would convert the amount to ...
Green's user avatar
  • 91
1 vote
0 answers
332 views

My Multibit wallet stops updating and says another program has changed files. How can I solve this?

I am running Multibit on Windows 7. When I open it, the synchronization will initially start, but then stop after a while due to "another program attempting to change files". I didn't move any files ...
gus's user avatar
  • 11
2 votes
2 answers
9k views

Mining with multiple older computers

Is it worth using about 20 old dell workstations to mine at once? They have ancient hardware from about 2003-2005. Would it be better to use than one computer from modern time?
YoItsJoe's user avatar
2 votes
1 answer
615 views

Why does Ripple needs to have a long ledger?

Why does ripple need to maintain a long ledger? Why is it not enough to maintain only the most previous transaction details? What is the purpose of having a long history ledger?
tdumidu's user avatar
  • 379
5 votes
1 answer
468 views

Pros and Cons between Ripple payment verification and centralized authority's payment verification

I want to know the advantages and disadvantages between Ripple payment verification system and centralized authority's payment verification system.
tdumidu's user avatar
  • 379
2 votes
2 answers
134 views

Where are statistics data about stolen bitcoins and successful attacks?

I am looking for data about stolen bitcoins. Is somewhere statistics about how many bitcoins were stolen etc.? I only know that bitcoins were stolen in Mt.Gox and Flexicoin...
user3473712's user avatar
0 votes
2 answers
1k views

Generating Ripple address

I am trying to recreate the Ripple address from Account Family wiki page and I am having some problems. I have the private generator of ...
ThePiachu's user avatar
  • 43.1k
1 vote
1 answer
876 views

I want to display information about my bitcoin node on a webpage (php or html)

I want to show information about my bitcoin node on a website.. how can I do this with windows + php + html + javascript + rpc? I want something like that but with more information and perhaps more ...
T-rage_11's user avatar
0 votes
0 answers
196 views

What Prevents the number of Bitcoins from being increased? After 21 Million? [duplicate]

Can the bitcoin MAX_MONEY attribute simply be changed from 21 Million to a higher number? If not what prevents this from being done? What would happen to existing addresses and accounts if MAX_MONEY ...
bithog's user avatar
  • 19
0 votes
1 answer
686 views

Creating An Altcoin: How to Lower or Increase Confirmation Times?

When Creating an Altcoin for fun, what variable/attribute do I change in main.cpp file to increase/lower the time it takes for confirmations to take place? Also can the confirmation times be changed ...
bithog's user avatar
  • 19
5 votes
0 answers
311 views

BTCJam API 500 errors

I am currently trying to set up an application using the BTCJam api. I think the api could be very useful, but I have been unable to get it to work fully, and since support isn't responding, I thought ...
Paul's user avatar
  • 171
2 votes
1 answer
2k views

How does a proof of work limit of `~uint256(0) >> 20` translate into a difficulty of `1 / 2^12`?

In the Litecoin source it is written: static CBigNum bnProofOfWorkLimit(~uint256(0) >> 20); // Litecoin: starting difficulty is 1 / 2^12 How does that compute? ~uint256(0) >> 20 is ...
Claudiu's user avatar
  • 447
4 votes
1 answer
370 views

Can I detect a 51% attack as a developer

I am a developer building an application that accepts payments in cryptocurrencies. Is it possible, in the occurence of a 51% attack, to build a script that detect this, so we can suspend withdrawals ...
user15628's user avatar
1 vote
1 answer
619 views

what is the difference between eatch coins wallet address,what is the coin public id/salt?

i looked at the link: http://brainwallet.org/ witch generate offline wallets for all major coins, i noticed that the same Passphrase generate different [Private Key&Address] pairs for eatch coin ...
itai's user avatar
  • 11
1 vote
1 answer
117 views

What is the chance of transactions being processed in different order that they are broadcast

Given I want to transfer bitcoin from A to B, and then from B to C. I broadcast two transactions to the network (with the same transaction fee), in order: A to B and then B to C. Is there any chance ...
Phương Nguyễn's user avatar
0 votes
1 answer
90 views

Can I limit the back-up data in wallet.dat?

I want to know is it possible to back-up manually from wallet.dat. I am running Dogecoin daemon locally. Scenario: say user (user1) have some dogecoin balance in addr1 another user (user2) have ...
M.R's user avatar
  • 501
-2 votes
1 answer
212 views

How to transfer different cryptocoins from one daemon to another

How to transfer different cryptocoins from one daemon to another. I want to send currency from dogecoin to bitcoin, I think trading engine do such process. Can I implement such process across local ...
Jsd's user avatar
  • 336
1 vote
1 answer
601 views

What happens to a p2pool payment with an invalid bitcoin address as the username?

I run a p2pool node (http://blisterpool.com) and someone just connected with an invalid bitcoin address. They have significant hashpower, and have already started generating p2pool shares...but their ...
user208735's user avatar
1 vote
2 answers
159 views

How to transfer signed tx from coldstorage to online system for submission into blockchain?

I am building an exchange for crypto currency. I need to be able to transfer tx from cold storage(offline) to hot wallet(online system) for submission. Usb stick is suitable for an individual user ...
Syler's user avatar
  • 111
1 vote
1 answer
264 views

Checking the received fund on an address of an HD Wallet

I'm running a bitcoind on my web server now. I would like to generate deterministic address (HD Wallet) and then check how much coin being received on such address. I'm looking at the Server API and ...
Phương Nguyễn's user avatar
6 votes
1 answer
2k views

listsinceblock parameter: target-confirmations

listsinceblock help returns: listsinceblock ( "blockhash" target-confirmations ) Get all transactions in blocks since block [blockhash], or all transactions if omitted Arguments: 1. "blockhash" (...
Doug Peters's user avatar
  • 1,366
-1 votes
1 answer
194 views

Managing Diff variable on eloipool software

I'm trying to set up a pool of Bitcoin Mining. I use a software program eloipool. https://gitorious.org/bitcoin/eloipool I can not find the configuration file options to force a change of Diff. So ...
arruah's user avatar
  • 41
0 votes
1 answer
109 views

Unable to recovery old btc address

Yesterday someone transfer by accident some btc to my old address not used since 6 months. I knew i deleted all this, but last spent hour I was able to find my walltet. So I installed bitcoin core, ...
user15615's user avatar

15 30 50 per page
1
487 488
489
490 491
620