All Questions
1
vote
1answer
21 views
What is the database for?
I see the block chain is stored according to the block chain format specification. But I also see there is a database, which is currently a leveldb database. Why is the block chain stored in two ...
1
vote
3answers
38 views
Do miners have to hold all the blocks in memory?
Running a miner node, one would have to verify transactions. This includes checking all the inputs of all the transactions.
Does this mean that a miner must hold all the block-chain in memory ...
3
votes
1answer
27 views
Who came up with pooled mining?
What was the first implementation of pooled mining? Who came up with it?
What protocol did they use and where can it be found?
1
vote
1answer
31 views
What is the hash-rate of the Bitcoin network that results in the maximum difficulty?
According to https://en.bitcoin.it/wiki/Target the target is a 256-bit number.
As the total hash-rate of the Bitcoin network rises, this number decreases to increase the difficulty. How much hash-rate ...
0
votes
0answers
17 views
Mt Gox send_simple API withdrawal with OTP (Yubikey)
I have a yubikey linked to my Mt Gox account.
I'm trying to setup an Bitcoin API withdrawal using: https://data.mtgox.com/api/1/generic/bitcoin/send_simple
However I get error message:
OTP is ...
1
vote
1answer
38 views
Why can't I participate on bitcointalk.org?
I just created an account and spend a frustrating hour reading help menus and trying to figure out how to post or reply to posts.
None of the buttons -- New Topic, Reply, Quote -- seem to be showing ...
0
votes
1answer
15 views
cgminer not working on deepbit.net
I installed Cgminer and created the batch file to run it
cgminer.exe -o http://pit.deepbit.net:8332 -u myemail@gmail.com_workerName -p s3cr3t
but when I run it I get
[2013-05-21 00:39:34] Started ...
2
votes
2answers
26 views
What does this indicator mean in the right bottom cornor of the official Bitcoin wallet?
Circled in red:
When I hover over it I get the message "8 active connections to the Bitcoin network". Should Is this number too low and how do I change it?
2
votes
1answer
39 views
What is mining intensity?
Both Bitcoin and Litecoin have an intensity setting when mining. What does this mean?
1
vote
1answer
120 views
How much would cost to mine a block with Google Compute Engine?
Google has opened its Compute Engine and it has a price list. How much would cost to mine a bitcoin block with Google Compute Engine?
3
votes
1answer
28 views
How to use bitcoinjs with TestNet?
One of my colleagues is trying to use bitcoinjs with TestNet, but apparently it doesn't like TestNet headers, so it doesn't work. Is there any way to make to use bitcoinjs with TestNet? Is there some ...
2
votes
2answers
39 views
test cases for hash algorithm anywhere?
RFC4231 gives test cases for SHA256 with several different sets of gozintas and gozoutas. I'm looking for something similar for the SHA256 hash as implemented in the Bitcoin mining algorithm.
Based ...
0
votes
1answer
27 views
safe offline electrum wallet
There is a good tutorial for setting up a safe offline wallet with a regular bitcoin wallet here.
If I want to set up a safe deterministic offline wallet (i.e. Electrum). What would be the right ...
1
vote
1answer
21 views
MtGox http api “trades since” requests keep being timed out
i wrote a simple function to retrieve trades from mtgox with following HTTP API call:
https://data.mtgox.com/api/1/BTCUSD/trades?since
documented here: ...
1
vote
1answer
35 views
How does a client get the merkle branch of a transaction?
When the Bitcoin client receives a transaction, it checks if the transaction is confirmed. This is done by verifying that the transaction hashes correctly, in the merkle tree, to the merkle root in a ...
1
vote
1answer
34 views
What's the formula that determines the validity of a block?
In other words, that exists a sha256(sha256(block header + nonce)) number under difficulty barrier number.
1
vote
1answer
24 views
What else can bitcoin inventory vectors be used for?
As described in the protocol specification bitcoin nodes respond to the inv command, which queries a node's knowledge of one or more objects, with an inventory vector. According to the bitcoin wiki, ...
1
vote
0answers
12 views
System error Database 1/0 error
I just updated my btc wallet to 0.8.1, I think, to a macbook. Now I can't open it, I keep getting an error message that says "System error Database 1/0 error"?
I'm fairly technically illiterate so any ...
2
votes
2answers
38 views
understanding SPV (simple payment verification)
I try to understand a SPV implementation.
I read: https://en.bitcoin.it/wiki/Protocol_specification and https://en.bitcoin.it/wiki/Thin_Client_Security as well as satoshis chapter 8 ...
0
votes
0answers
33 views
blockchain.info iPhone wallet app sends without transaction fee
I recently sent some bitcoin to a friend using the blockchain.info iPhone app and it sent it with 0 transaction fees. As a result it caused an awkward situation as my friend was watching block after ...
0
votes
0answers
19 views
Matching pushpool difficulty with stratum's
I have a new question for you.
I have setup the stratum mining proxy, and all is working fine. (Actually found our first block recently!)
However, I have pushpool running as well, and some of my ...
2
votes
1answer
26 views
Blockchain.info API error handling
I've been working on a project involving use of the various Blockchain.info APIs (specifically the Blockchain Data API), and am wondering if anyone has tips regarding error handling: the API ...
2
votes
0answers
23 views
Bitcoin-QT Merge Question [duplicate]
Can one import wallet.dat into Bitcoin-QT without overwriting the current wallet? Kind of like a merge function? Or is Blockchain.org the only we to merge wallets together under one account?
3
votes
3answers
68 views
How much do nodes get from blocks, including fees?
I am trying to evaluate how much one could earn as pool owner/solo miner if bitcoin really appreciates in price. To get a number i try to get a figure how much one mined block generates in for example ...
0
votes
0answers
14 views
MAC testnet mining with bitcoin-qt
I configured bitcoin-qt with the following bitcoin.conf file:
rpcuser=bitcoinrpc
rpcpassword=xxx
testnet=1 //needed to work under the testnet.
server=1 //needed to solo mine.
gen=1
Is this correct? ...
0
votes
1answer
25 views
Bitcoin wallet not syncing
My bit coin wallet sync is stuck, if anything the blocks remaining is increasing.
It is not my computer or network because I have another wallet on a different hard drive and that wallet synced in a ...
1
vote
3answers
25 views
Synchronizing Wallet
What is the normal synchronzing time for your wallet when you fist start; because Im using 4G on a wireless and it seems to be taking forever to countdown the number of blocks left to proper sync
1
vote
1answer
55 views
Do I need to wait for Bitcoin-Qt to sync with the network before using GUIMiner?
I'm waiting for Bitcoin-Qt to synchronize with the network, but it takes a long time. I'd like to know if I can start using GUIMiner while it's Bitcoin-Qt is still synchronizing.
1
vote
1answer
26 views
Intermediate pool server
Is it possible to make "intermediate" pool server, which will be gateway to real pool?
I have about 200 pc's, each pc connects to my intermediate pool using own login pass. Intermediate pool should ...
-2
votes
0answers
25 views
Has anyone used Buybitcoinaustralia.com? [closed]
I am relativity new to bit coins. I have used spendbitcoins.com before but today I found a site buybitcoinaustralia.com. They have the cheapest fee I have seen around and claim that I can do the whole ...
4
votes
2answers
211 views
Hacked my blockchain.info wallet, stole 760 coins
Two days ago my wallet at blockchain.info was hacked, everything was taken (760 coins).
https://blockchain.info/tx/0619d221a761a3b8ec205773440fa6607d65957ef985dac5fb5273a08bda2c89
Besides the ...
0
votes
0answers
46 views
Mining Litecoin on FreeBSD
I am currently using Gentoo and bfgminer to mine litecoin using GPU's
My ultimate goal would be to mine litecoin using AMD/ATI 7900 Graphics cards on FreeBSD, I don't need to use a released version ...
1
vote
1answer
41 views
Will DHS eventually stop wire transfers to/from Mt Gox? [closed]
This past week the US Dept of Homeland Security stopped all Dwolla transfers to/from Mt Gox. Do wire transfers to/from Mt Gox still work? Will the US DHS eventually shut down wire transfers to/from ...
2
votes
1answer
37 views
What does Bitcoin-Qt “Change Passphrase…” do to existing private keys and corresponding addresses?
"Change Passphrase..." obviously lets me encrypt the wallet with a new string of text. I think (correct me if I'm wrong) that this creates new private key(s) inside wallet.dat.
How are existing ...
0
votes
1answer
23 views
Is there an OS X desktop client for BlockChain.info?
I know it may be possible to achieve on Bitcoin-Qt app but don't want to download the whole blockchain into my laptop. I just want a desktop GUI for my BlockChain.info wallets. Is this possible? If ...
1
vote
1answer
36 views
What would be a good choice of server host to run an exchange on?
I was looking at Amazon Web Services recently but they are based in the US - maybe not a good idea following what happened with mtgox.
I then looked at Linode as they have a pretty solid reputation, ...
2
votes
1answer
39 views
FPGA/ASIC with general SHA-1 and SHA-2 capabilities
With the introduction of ASICs and FPGAs, I am looking to upgrade my rig. However, I use the rig for academic research involving brute-force SHA-1 and SHA-2 cracking (I am working on make passwords ...
0
votes
0answers
22 views
Does generated payouts = the # of Bitcoins
I have been using (Bitcoin Plus) for quite a while. Do the generated payouts numbers shown in my account equal the amount of Bitcoins I should have?
1
vote
1answer
74 views
Is vanitygen a problem for bitcoin?
Considering the amount of users of vanitygen, and the fact that each user is generating millions/billions of bitcoin addresses, won't we run out of bitcoin addresses soon? What would happen if we did ...
0
votes
1answer
19 views
cpuminer - what command line tools are required?
I'm trying to run cpuminer on my Mac, though cpuminer requires a lot of command line tools - such as curl, libidn, etc. What are all of the tools required, and what is the minimum version of each I ...
2
votes
2answers
35 views
Integrity of ensuring the correct recipient of a BTC public address?
If a hacker gains access to a website and proceeds to vandalize the website, including changing the public-key of a BTC wallet, this would direct all payments to the hacker. Is this a security risk ...
1
vote
1answer
29 views
Stuck on blockchain 8791 - Synchronizing [duplicate]
I don't know what's wrong with it, but I would really appreciate it if someone can help me. I've already been receiving money from this address so I really don't want to delete it. I have 3 BTC coming ...
3
votes
2answers
114 views
I traded XRP for BTC. How do I withdraw my bitcoins from ripple.com?
I traded XRP for BTC. How do I withdraw my bitcoins from ripple.com? I guess I need to withdraw to bitstamp.net somehow?
2
votes
2answers
88 views
What is meant by Bitcoin dust?
I've seen the term "dust" used to describe small transactions that might be considered as spam by the Bitcoin network. Is there is a generally accepted definition of this term?
2
votes
1answer
51 views
Does using deterministic wallets reduce our anonymity?
Is it possible to figure out that certain addresses belong to the same wallet? Say I have 2 or 3 addresses that I know were created by a deterministic wallet like Armory. Is there a way to find all ...
1
vote
1answer
44 views
Can I use the official wallet to recover bitcoins sent to an alternative wallet?
I like alternative wallets like Armory and Electrum because they offer more features, some of which are fundamental for security and convenience. But I'm a bit worried about them not being ...
2
votes
1answer
102 views
Import wallet.dat into a new Bitcoin-Qt client
I had Bitcoin-Qt on my computer with several bitcoins in my wallet, using Vista. Then my computer crashed. Finally I was able to get my computer fixed and download a new version of Bitcoin-Qt. Now I ...
3
votes
2answers
65 views
Will ripple automagically use the ordebook when finding a path?
I have a question regarding this scenario.
A (test-gateway)
28000 XRP in balance
B (user1)
trust line with A for 1000 USD
400 XRP in balance
C (user2)
trust line with bitstamp for 100 BTC
...
1
vote
0answers
64 views
Bitcoins didn't arrive to new wallet
I use Bitcoin-Qt. Decided to make another wallet and transfer some bitcoins there. Wanted to give that wallet to my friend as a gift. What I did was:
renamed wallet.dat file to 1_wallet.dat
started ...
-3
votes
1answer
60 views
is it unusual for no daily activity? [closed]
On day 1 i spent syncing up the client and spending time on free bit coin sites to try and get started into bit coins.
On day 2 i spent more time on free sites and got 5 transactions 2 that remained 0 ...
