All Questions
30,996
questions
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?
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 ?
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ?
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 ...
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 ...
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?
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?
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,"...
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 ...
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 ...
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 ...
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....
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 ...
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 ...
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 ...
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 ...
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.
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 ...
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/...
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 ...
-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 ...
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 ...
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 ...
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?
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?
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.
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...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
-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 ...
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 ...
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 ...
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 ...
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" (...
-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 ...
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, ...