All Questions
31,063
questions
0
votes
1
answer
482
views
Calculating the mining profitability of Novacoin
I've been researching altcoins and keep coming across some staggering figures. I think it's just too early to do math, but if I were to farm novacoins for example calculator here and I have pretty ...
- 103
1
vote
1
answer
143
views
Does Ripple support Gateway interest?
I know that Ripple supports currency demurrage, as in the decrease of amount of currency one has over time. However, I am wondering if the opposite is also possible? Can one automatically program ...
- 43.1k
4
votes
2
answers
2k
views
Library for trading on major exchanges
Is there a library which exposes order-book and trading functionality of major exchanges like BTC-e, Bitfinex, Cryptsy etc. ? I know these site have their own API but I wanted to re-use the code, if ...
- 153
0
votes
2
answers
92
views
Nosey/disgruntled employees at my VPS company
How can I take steps to prevent/detect bad employees stealing my money?
I'm running bitcoind on a VPS with Ubuntu 14.04. Only ports open are 22, 80 and 443. I have fail2ban and auditd enabled.
...
- 131
2
votes
1
answer
435
views
Maximum `getdata` message size
From the Bitcoin wiki's Protocol Specification page:
getdata
getdata is used in response to inv, to retrieve the content of a specific object, and is usually sent after receiving an inv packet, after ...
- 29.4k
1
vote
2
answers
456
views
Can I independently verify the integrity of the network with only block headers?
Section 7 of the official Bitcoin paper "Reclaiming Disk Space" explains that only block headers are needed to verify transactions. Essentially by making sure that the transaction has been buried ...
- 5,212
1
vote
0
answers
139
views
Is it possible to identify exact GPU type using miner's log file?
In the miners (sgminer) log file I have the following lines:
[21:14:19] ADL index 0, id -546853344 - BIOS partno.: 113-C3865001-T04, version: 015.041.000.000.000000, date: 11/25/13 02:47
[21:14:19] ...
- 175
4
votes
1
answer
1k
views
Are transactions containing zero-value output accepted by miners?
Would miners generally accept a transaction that has one of its output values set to zero? Can the acceptance in this case depend also on the scriptPubKey associated with the zeroed output?
- 1,424
0
votes
1
answer
82
views
If Bitcoin is not stolen from an address for some months does it suggest that malware did not capture the key?
Some months ago, using bitaddress.org (offline but using my normal operating system), I made a key pair, copied the key and address to paper and stored a small quantity of Bitcoin at the address. ...
- 421
3
votes
3
answers
618
views
Is there an updated accurate list of retailers who accept Bitcoin from Canadians?
I'm new to Bitcoin and I wanted to know which retailers/hotels would accept Bitcoin as a form of payment from Canadians. If a site accepts Bitcoin as a form of payment does that mean they accept it ...
- 169
1
vote
1
answer
314
views
Multibit Won't Open
I have NOT done any kind of system restore (don't have the hard drive space for that)
The multibit application won't open. I tried installing the latest version, didn't seem to do anything.
I've ...
- 11
2
votes
1
answer
209
views
Bitcoin payout based on real-life event
Just starting to learn bitcoin scripting. Can someone explain how to pay out based on some real-life event?
I currently test from the command line with bitcoind -regtest
2
votes
1
answer
635
views
Is there any regulations on buying and selling Bitcoin on eBay?
I see a lot of people selling Bitcoin on eBay. Since the government began regulating exchanges, are there any rules you have to follow now to sell Bitcoins on a site like eBay? Additionally, are there ...
- 153
6
votes
2
answers
3k
views
Must a Block contain a coinbase transaction?
Must a block contain a coinbase transaction? If so, how is this enforced?
- 2,443
5
votes
4
answers
6k
views
When will next halving events occur?
I've read in some places that the next halving event will be on 2016. How can this be estimated?
- 1,784
2
votes
1
answer
186
views
What is a public NXT api i can access?
Is there a public site where you can access the nxt api? like how blockchain.info does it. all i want to do is make queries to retrieve all the messages in the nxt network to see the activity.
- 11.1k
2
votes
1
answer
290
views
is bfgminer running correctly?
As a complete newbie I purchased USB ASIC mining device, installed bfgminer on raspberry pi and tried to run it. As the reward is not changing, I am wondering whether bfgminer is running correctly.
...
- 121
0
votes
2
answers
83
views
Where Bitcoin is kept and what fees are included when liquidating Bitcoin
I have small question, where does bitcoin "banks" keep money you pay them for bitcoins? do they keep it in some kinda bank ?
and when we sell bitcoins to dollars what fee do we pay?
user3174140
0
votes
3
answers
983
views
How vulnerable are offline users of bitaddress.org, who don’t use Ubuntu?
By not installing Ubuntu and not removing the hard drive, I suppose I am vulnerable when I open bitaddress.org offline and enter the 64 random hexadecimal characters I have generated without a ...
- 421
11
votes
1
answer
2k
views
Is the threat of computer malware to steal Bitcoin exaggerated?
Some months ago I put a small amount of Bitcoin into an account and wrote the address and private key into a text file. I have left on my computers and on those of a couple of friends. The money hasn’...
- 421
2
votes
3
answers
969
views
How does the receiver of a transaction check the whole chain of ownership?
While reading Satoshi Nakamoto's paper on how bitcoin works, I got stuck on #2. In a chain of transactions, how can someone who has received the coin check the whole chain with just a signed hash of ...
- 21
2
votes
1
answer
1k
views
What shape of merkle tree does the Bitcoin client build?
The Bitcoin client builds a merkle tree to represent the transactions, then includes the root of that tree in the block header.
But usually, the number of transactions is not a power of two. When ...
- 29.4k
4
votes
2
answers
321
views
Accelerated block generation
According to http://btc.blockr.io/ :
Height Block created Transactions Block fee Size (kb) Days destroyed
318525 2 minutes ago 28 0.00370000 8.36 kB 2.00
318524 3 ...
- 1,366
1
vote
1
answer
703
views
Can you transfer NXT assets directly to another nxt account?
I purchased a few mgwBTC (multigateway bitcoins) and I want to be able to transfer them to my other account. Is this possible? Can someone take a snapshot of how this is done? thanks.
- 11.1k
1
vote
3
answers
290
views
How many OP_RETURN transactions in the Blockchain would be too many?
I realize this question may not have an answer and therefore might not be suitable for SE, but I'm very curious about OP_RETURN transactions.
OP_RETURN transactions appear to be the accepted ...
- 165
1
vote
0
answers
144
views
Standardize wallet format [closed]
What's the status of wallet format standardization? Is there any proposal or work-in-progress around? If not, how come nobody urges to define standard wallet formats yet?
This is especially needed ...
- 386
3
votes
2
answers
142
views
Is Bitcoin a developer only currency and community?
The Bitcoin repo on Github has 7 members. Ultimately, they decide what bug fixes and pull requests get merged. I don't understand how this is decentralized? Yes, it is open source, so anything they do ...
- 171
3
votes
1
answer
743
views
How to detect a rejected transaction?
If the nodes I connect to don't support the BIP 61 reject message, how do I know that my transaction was eventually rejected by the network (e.g. due to my bugs)? Is there any timeout or whatever ...
- 386
0
votes
2
answers
261
views
getbalance not working
I am getting this error when I type getbalance:
error: {"code":-1,"message":"std::bad_alloc"}
Basically, I type getbalance and wait for about 2 minutes and this error appears finally.
What does it ...
- 1,142
8
votes
4
answers
9k
views
How can I search for transaction text on the blockchain?
Is there a google like search engine which can search for any text that is included with a bitcoin transaction? As I understand it each transaction includes 80 characters of text as well.
Update
It ...
- 83
0
votes
2
answers
424
views
Payee identity verification
When reading the Bitcoin paper by Satoshi, I noticed that he didn't mention any protocol by which the payer can verify the payee's identity, i.e. he is indeed paying the intended recipient. I would be ...
- 212
5
votes
1
answer
906
views
BIP32 wallet sync with Bloom filters
I'm working on my SPV library and I still have a hard time figuring how to approach the BIP32 + Bloom filters combination. Here's how I currently sync an existing HD wallet (after fast catch-up):
...
- 386
1
vote
1
answer
258
views
Why does the script contain the hash of the public key
The ScriptPubKey contains the hash of the public key, and this is compared to the public key in the ScriptSig. It is not possible to derive the public key from the hash (address). But when the output ...
- 131
3
votes
1
answer
706
views
Defeating email spam with Bitcoin
There was a paper somewhere proposing a scheme for filtering email spam with the use of Bitcoin micropayments. I can't remember where I saw it and can't find it now. Anybody knows about it?
- 1,424
0
votes
1
answer
151
views
How can I view all the NXT nodes that I can access publiclly?
Where can i find a list of NXT IP nodes that I can connect to publicly? I want to be able to use them as a backup connection to the nxt blockchain if my own nxt server crashes.
- 11.1k
3
votes
1
answer
2k
views
New to Bitcoin - tips on securing my server
I regard myself as being a competent programmer and have good general IT knowledge; however I know very little about BTC. I just want to make sure that my setup is "generally secure" and that I'm ...
- 131
3
votes
3
answers
210
views
Bitcoin vending machine
If I wanted to build a vending machine where one could buy a cola paying with bitcoin, is the following scenario the typical way to do it?
Customer approaches the machine, and selects the product (...
- 135
3
votes
2
answers
3k
views
Running Multiple Full Nodes on one Host
simple question. I would like to run several full nodes for Bitcoin, Litecoin, Darkcoin and so on, but don't they run on the same port (8333)? Will this just work or do I need to give them several ...
4
votes
1
answer
2k
views
What does "Safe mode: Warning: The network does not appear to fully agree! Some miners appear to be experiencing issues." mean?
My bitcoind client that runs on testnet has started returning a lot of errors today. It has been doing so for a few of hours (as of 2014-08-29 9:50 UTC).
When I call it via RPC, I get the following ...
- 275
0
votes
1
answer
2k
views
Passphrase lost for my wallet.dat
I need help to unlock my passphrase. I don't remember setting up one, but now there is a pasphrase. Eitherway I am unable to send out coins from my LitecoinQt to the exchange.
- 1
0
votes
1
answer
1k
views
WIF Format and Storing Private Keys
I'm writing an Android app which will be storing private keys for Bitcoin and a few Altcoins in an SQLite database. To store my private keys, I was initially using the WIF. When I take them out of the ...
- 14.2k
1
vote
1
answer
2k
views
Get a JavaScript notification when Bitcoin transaction arrives to a certain address
I'd like to implement a very simple address monitoring feature on a site I'm working on. I'd like to just be able to say "Listen to this address on the testnet for money to come in", and update the ...
- 111
1
vote
1
answer
250
views
Is it correct that more than 160 bits of input data for producing a private key are superfluous?
If this is true, when I make a 64 character hexadecimal private key I need only provide randomness for the first 40 characters (40 x 4 bits per character = 160). The remaining 24 characters can be ...
- 421
3
votes
1
answer
494
views
Maximum number of transactions in wallet.dat for Bitcoin Core
I know that a large number of key pairs in wallet.dat is not a concern. But is having too many transactions in wallet.dat an issue?
Can Bitcoin Core start crashing after it reaches a certain number ...
1
vote
2
answers
2k
views
Are time, timereceived and blocktime in UTC?
I read around about the differences between time, blocktime and timereceived, but one question remains. Although I assume all times are UTC, I haven't seen that mentioning specifically anywhere.
Does ...
- 315
1
vote
0
answers
577
views
When you sweep a private key at Blockchain can you sweep the key in HEX format?
It would be useful to know this because I have made a 64 character hex private key by hand and generated the address without storing the key in WIF format. I don’t want to go online, input the hex key ...
- 421
1
vote
1
answer
520
views
what are BTR points in Bter exchange
what are BTR points in Bter exchange? Can we convert BTR into an alt-coin? If so, is there any fees they charge. How many times can I exercise this option for a particular month?
- 113
2
votes
2
answers
791
views
Is there a way to buy bitcoin immediately?
I want to use PHP to write a script to buy bitcoins and my bitcoin balance will be updated immediately (i'm NOT in US).
For example, I use my credit cart to purchase bitcoins. less than 1 min later, ...
- 85
1
vote
1
answer
55
views
Any advantages in terms of our location & East-West timing differences for self mining on a 100 th/s btc rig
I do live in india.. I believe that bitcoin mining rig owners are very lessaound us ..I read some where that we will be able to mine more bitcoins while the west or far-east sleeps..
2
votes
2
answers
1k
views
Why should I pay in bitcoin as opposed to traditional payment methods?
Recently I have seen a few online stores starting to accept bitcoin as a payment method, but I can't think of a reason why I would ever want to pay in bitcoins.
Since I get paid in GBP then I would ...
- 21