The blockchain is a list of all transactions that have occurred using the bitcoin currency. Please don't use this tag for the service named 'blockchain.info'
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Bitcoin-Qt wallet is taking forever to synch. Can I just use the same address elsewhere to collect coins?
It will take several days before the wallet is in synch. But I already purchased a Bitcoin and waiting for it to transfer into my account using the address that was generated by Bitcoin-Qt. Can I just ...
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2answers
48 views
Reliable, efficient way to parse the blockchain into a SQL database
I need to generate a SQL database (preferably SQLite3) of every transaction that has occurred in the blockchain. Is there an efficient way to do this using open-source software? I'm attempting to do ...
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1answer
18 views
How do I get testnet block height?
Like I would do wget -O - http://blockchain.info/q/getblockcount 2>/dev/null for the main net.
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1answer
65 views
How to track bitcoin transaction?
I have sent 0.00778963 BTC to 1BF8SHKnT8ZysYNrj5toeu6DsuGE5XDcCR
It is more than a day and I dont see it in the wallet. The receiving address is a coinbase account wallet.
Please let me know how I ...
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1answer
21 views
Blockchain.info: Which address should I give for “New Shared Address”?
I am new to Blockchain.info's wallet's features.
I clicked the "Receive Money" tab, then clicked "Shared" and then the green button labeled "New Shared Address". It gave me the following:
Address ...
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1answer
40 views
How to process refunds and ensure that after a crash you dont resend to someone
I want to have a server running that will be processing payments and refunds. However, I also want to ensure that should my server die, that after a restart I will continue sending out any applicable ...
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0answers
27 views
Is there a fresher blockchain download available?
The link provides a blockchain but it is dated
2012-03-10
http://sourceforge.net/projects/bitcoin/files/Bitcoin/blockchain/
Please someone make the blockchain available as a download.
And yes I do ...
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1answer
24 views
Armory client shows transaction unconfirmed
I am new to btc and am using the Armory client. Yesterday I transferred some btc to wallet from my MtGox account. The wallet showed the btc received within minutes, but, after 12 hours it still shows ...
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1answer
30 views
How to run bitcoind (command line client) without connecting to other nodes?
I'm running Abe to create a blockchain SQL database, so I don't want the Bitcoin client to touch my copy of the blockchain at the moment. But I would like to query the blockchain with the bitcoind ...
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1answer
28 views
By byte size and number of inputs/outputs, what are the largest transactions in the block chain so far?
Disregarding value, but instead going by size in the protocol, what are the largest transactions so far in the history of Bitcoin, in terms of:
byte size
number of inputs ("vin")
number of outputs ...
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1answer
41 views
How do I receive bitcoins for a game server? [duplicate]
I want to sell digital goods for BTC.
AFAIK, I have to associate the purchaser + BTC amount + address received + digital good.
I could set up multiple addresses for each client. If I kept a ...
3
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1answer
48 views
How to retrieve transactions whose input/output matches an address?
I am working on a Blockchain.info-like block explorer and I have some questions regarding best practice for data retreival. I know that outputs do not necessarily match an address, since script can in ...
2
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1answer
25 views
How do I find out what getwork would have returned for an already mined block?
Lets say I want to find out what getwork would have returned for an already mined block http://blockexplorer.com/block/00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d. How would I go ...
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0answers
25 views
Unconfirmed transactions for a week [duplicate]
I sent two transactions to the same place. I think they both show in blockchain, but they aren't at the intended address. After 48 hours, I got concerned and changed from Electrum to Bitcoin-Qt, ...
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2answers
73 views
Technical Review of Bitcoin
I am currently looking on how does Bitcoin work, and I would like to sum things up with your help. The point is, if I ever want to write my own mining agent, what do I have to understand in order to ...
2
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0answers
72 views
What files do I need to copy to a new computer to prevent having to sync with the network?
I think this used to be the blk0001.dat file, but it seems that the block chain is now (since version ?) moved to the blocks/ folder, containing a lot of blk* files, as well as an index file and ...
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2answers
60 views
Do transactions get slower over time?
The number of blocks formed is 1 every 10 minutes. As the number of transactions increase, wouldn't the time taken for a transaction to confirm become slower?
I am asking this because this the number ...
2
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1answer
108 views
What contributes more to bitcoin network? Using Bitcoin-Qt or running a miner?
What would make a better support for bitcoin?
Does it really makes any difference to store blockchain locally instead on a remote server?
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1answer
50 views
Blockchain is showing 2 incoming addresses for a transaction?
A transaction into one of my wallets is showing that it came from two addresses? How can I find out which one it came from?
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1answer
100 views
Why do transactions need to be spend fully? [duplicate]
If I want to send you 75 and I have 100, a transaction of 100 will be made, in which I get 25 back as change. Why is this?
See also Change
When the output of a transaction is used as the input of ...
4
votes
2answers
99 views
Is there a way to find the coinbase for a given block using only bitcoind commands?
ASICMiner includes hex(Mined By ASICMiner) in the coinbase.
I'd like to generate weekly statistics that include ASICMiner' solo-mining efforts, but I don't want to have to rely on blockchain.info or ...
2
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3answers
455 views
If the blockchain records all transactions, how does losing your wallet imply that you lose your Bitcoin?
My understanding is that the blockchain records every transaction that has ever occurred, and that, when we say there are x amount of coins at address y, what we really mean is that the blockchain ...
2
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2answers
96 views
How does ASICMINER use the blockchain to record share ownership?
My understanding is that ownership of ASICMINER shares (direct ownership, that is; not passthroughs) is recorded somehow in the blockchain, itself.
How does that work, exactly? How can I confirm ...
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1answer
53 views
The change to the size of blockchain data files
The blkXXXXX.dat files in the new Bitcoin-Qt client (v0.8.1) are about 130MB each in size, which the old ones are about 1.9GB in size. Does anyone know the motivation behind this change?
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1answer
46 views
When a difficulty change reaches the upper or lower bound (4x current), what is the implied impact on time per block?
Can someone work out the math that occurs with Bitcoin and Litecoin when the target changes to the hard coded minimum and maximum value, with respect to time?
In other words, if a lot of hashpower is ...
4
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1answer
254 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 ...
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1answer
63 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 ...
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1answer
37 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 ...
1
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1answer
103 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
2answers
120 views
Calculating address balance
Is there some method how you can calculate the balance of an address without resorting to web-based API's? When I import a private key the rescanning of bitcoind takes hours. I know to get a balance ...
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0answers
37 views
How to get current BTC rate for BRL(real) using php cURL or javascript
Is there anyway to get current rate of BRL = BTC.
I saw the blockchiain ticker. But the value for BRL currency is not updated
As listed here in preev.
I want to get the
current 1BTC= how much BRL
...
2
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2answers
168 views
How to check Bitcoind block chain download progress level
i have installed bitcoind on ubuntu server, and when i run screen -x for btc it says error -10 blockchain is downloading, How do i know the progress level, currently 125600 blocks are downloaded, how ...
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2answers
246 views
How many Bitcoin addresses are there?
I was wondering where I could see how many unique addresses currently exist in the blockchain, and especially how many of those have a positive balance. Is that data available somewhere?
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0answers
43 views
Bitcointools for v0.8+?
I was looking to poke around about with some of the functions of https://github.com/gavinandresen/bitcointools but it claims to only work for earlier versions of bitcoin. Am i just out of luck? or is ...
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1answer
196 views
bitcoin from ebay
I bought a bitcoin on eBay, but my bitcoin wallet is taking FOREVER to sync. How can I see if I own a bitcoin? Do I have to wait probably weeks for the wallet to sync?
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1answer
27 views
list of blocks as text file [duplicate]
Is there a reliable source where I can download the blockchain as a text file? Or perhaps is it included in my bitcoin-qt folder after it synchronizes with the network?
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1answer
96 views
What makes the initial download of the blockchain so slow?
If you download a bootstrap copy of the blockchain through torrents, it will be faster than getting that same data through the Bitcoin network.
Ofcourse the BitTorrent protocol is more optimized for ...
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1answer
86 views
When was the first non-coinbase transaction?
What's the block number? Also if it was a test transaction, then what was the first event of real commerce if know?
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0answers
42 views
Bitcoin-Qt [0.8+] can read the blockchain. How can I? (and make it human readable) [duplicate]
Most questions answer this about the old 0.7 version of keeping the blockchain. 0.8 changed to leveldb instead of berkeleydb from what I've read, and obviously Bitcoin-Qt is able to read it. For a ...
3
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1answer
101 views
How to transfer only the blockchain to a friend's computer?
After installing the bitcoin client (Qt) a friend got interested as well. He doesn't have as fast an internet connection, though, so I thought of burning some DVDs with the blockchains for him to ...
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1answer
32 views
Is it normal for ABE to get “out of sync” whilst re-creating it's blockchain?
Is it normal for ABE to get "out of sync" whilst re-creating it's blockchain?
I am concerned that the number on the left does not match the number on the right. I have no idea what those two numbers ...
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0answers
17 views
statistics on actual “replacement” of blocks
I'm not sure if I'm using the right terminology but I know that theoretically it's possible for a block to be part of the longest (i.e. "main") blockchain but then be "replaced" by an alternative ...
2
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1answer
233 views
Alt currencys blockchain viewer
I know we have blockchain.info for bitcoin
I am trying to track a missing FTC transaction going to btc-e (seems a very common thing money going missing with these jokers)
Are there any similar ...
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1answer
303 views
Can I change the bitcoin block-data directory from /home/user/.bitcoin/blocks to something else? [duplicate]
I have two users on my linux system.
daemonuser, which runs bitcoind
and
abeuser, which runs Abe
Whenever I start Abe, I am told:
Skipping datadir /home/daemonuser/.bitcoin/blocks: [Errno 13]
...
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0answers
48 views
Are we anonymous against governments? [duplicate]
If all transactions are public knowledge and coins are identifiable and thus traceable. With the power of subpoena can't a government uncover who bought the coin(s) from an exchange. It might be ...
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1answer
83 views
Blockchain receive payments API Network propagation
I'm using the Blockchain API to generate an address to receive payments. I received a payment to a generated address, then Blockchain sends the received amount to the address I defined but that ...
4
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1answer
240 views
bitcoins can use different algorithm, how and implications
I read that if sha-256 was compromised at some point in the future, or for any other reason, bitcoin could switch to a different algorithm
can someone detail how exactly that would work, and what the ...
2
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3answers
271 views
What is the Merkle root?
The Bitcoin wiki Vocabulary article explains why the Merkle root exists:
Every transaction has a hash associated with it. In a block, all of
the transaction hashes in the block are themselves ...
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2answers
184 views
Could ASICs be used to mine a “BitcoinX4” blockchain?
Bitcoin, on average, has a block every 10 minute. There are advantages (pdf) to having a higher "clock rate", e.g. Litecoin's block every 2.5 minutes. I call "BitcoinX4" the theoretical blockchain ...
3
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1answer
198 views
Creating my own bootstrap.dat?
Since I have been tearing down and setting up bitcoin clients a lot for some experiments lately, I was wondering whether there is a simple way to speed up the synchronization with the network. One ...
