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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Old transactions in the blockchain

After a lot of reasearch on the net, I still can figure out if the following idea is relevant or not : I know (or at least I think I know) that each transaction consume all the bitcoins present at ...
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Is there any way to move the Blockchain? [duplicate]

I'm using a solid state for my boot drive, I'd like to make sure the blockchain goes to my data drive, any way to acomplish this? Edit: I am using easyminer and bitcoin-qt, it is about moving the ...
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50 views

Blockchain length by number of blocks or transactions?

It is my understanding that the longest blockchain is the one that should be used. Is "longest" measured by the number of blocks or the number of transactions?
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50 views

Chronologically sorting transactions within a block

Is there any way to chronologically sort transactions within a block?
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Sort order of transactions on blockchain.info

This list of transactions is supposed to be sorted by time, newest first: https://blockchain.info/address/1BWk7rcf4fRS6XHEDqVQPeeoZitGB65GYE?sort=1 However the transactions are not displayed in ...
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What is the bitcoind command to see how much btc a specific address has?

I was wondering if I can make a query via the console on how much btc a specific address has without having to go into blockchain.info. What is this command?
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Can Bitcoin-QT be configured to trim the blockchain?

I run bitcoin-qt + armory on a laptop. I don't have the space to store the whole 20GB (or however big it is now) blockchain. I understand the need to run through the entire thing for security, but ...
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71 views

Request blockchain for transactions

I have installed bitcoin-qt, so I maintain the blockchain locally. I have a list with transaction hashes strings (i.e f5d8ee39a430901c91a5917b9f2dc19d6d1a0e9cea205b009ca73dd04470b9a6) and I want to ...
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35 views

Do transactions reference the containing block of the previous transaction?

According to the wiki, it appears as if the previous transaction's index is referenced but not the block in which it's in. Why? How are transactions stored in the database that doesn't make ...
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280 views

How explicitly can the blockchain be pruned?

How can the blockchain be pruned? If the blockchain is tamper-proof thus cannot be changed, how can the data be removed? Please be as explicit as possible.
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As of today Jan-2014. How much drive space does the following coins blockchain data take?

As of today 2014-January-05. How much drive space does each of these coins take after downloading the complete blockchain? Bitcoin Litecoin PPCoin Florincoin Philosopher Stone Norbits Anonymous ...
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204 views

How do you configure windows to store the bitcoin blockchain data into another directory?

I'm currently on windows and was wondering how do you make the qt client download the blockchain data to another directory? Since my main drive is a SSD hard drive, I don't have much space to spare. ...
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86 views

Can an old block be inserted into the blockchain?

I've been shown how network time is enforced, but I'm still having trouble understanding how a false old block cannot be inserted into the blockchain with the entire chain remined or how a powerful ...
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103 views

Largest block (measured in Bitcoins)

What is the block in the blockchain with the most Bitcoins transacted?
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130 views

Block explorer with testnet raw hex data

Blockchain.info allows you to look at the raw hex of a transaction. But it doesn't have testnet functionality. Blockexplorer allows you to look at testnet, but I can't find a way to show the hex dump. ...
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130 views

Does Proof of Existence lose bitcoins?

http://www.proofofexistence.com/about -- "Use our service to anonymously and securely store an online distributed proof of existence for any document." The document is certified via embedding its ...
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193 views

How to decode very huge (!) raw transactions?

I'm parsing the blockchain to extract certain information I need for a script. One thing I do is parsing transactions. What I do is: getrawtransaction <tx> decoderawtransaction <rawtx> ...
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145 views

Block confirmation speed

Based upon any standard you think relevant, how quickly are current blocks being verified for rule-following such as correct balance tallies, true transactions, correct rewards & fees? Is this an ...
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155 views

How can the blockchain survive without an army or other kind of law enforcement?

I'm sold on most of the Bitcoin aspects. I believe that the blockchain has incredible potential value and how the fact that it's decentralized removes a lot of the corruption and cronyism that are ...
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Are transactions still tamper-proof if blocks are hashed without nonces?

If an alt were to forgo difficulty and timed release of new supply by removing the nonce from blocks therefore the whole difficulty/target system, is hashing without nonces still providing the same ...
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376 views

Where are my bitcoins?

I recently bought 18 euros of bitcoins (16 dec 2013). I finally got my wallet synchronized, but I still do not see my balance, nor my transactions. On the blockchain I see that I received my ...
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325 views

Move the blockchain to a different location

I am using the bitcoin qt app on ubuntu but the blockchain is very large and is wasting space on my ssd is there a way that I can move it to hdd. There doesn't seem to be a setting for this is it ...
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147 views

How does blockchain.info get it's info? Is it via the RPC interface for bitcoind or by reading the raw blockchain directly?

How does blockchain.info get their info? My intuition tells me that they have a modified client that reads and processes the blockchain (either directly from the network as it comes in or from the raw ...
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124 views

How to get a history of incoming and outgoing transactions for a certain address?

Along with the history of incoming and outgoing transactions, how would I find the first block that that address appeared in (to find when the wallet was created)? I want to do this by parsing with ...
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133 views

What would it take to track dollars like bitcoins?

Watching an ATM from a large US Bank accept a cash deposit makes me wonder - what would it take to track dollars like bitcoins? Said another way, what would a blockchain for fiat cash look like? ...
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When will the blockchain be pruned?

AT what stage will the blockchain be pruned? With more update of bitcoins the blockchain will start growing exponentially making downloading thereof impractical.
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Transactions are verified by miners. What happens when the last BTC has been mined?

Let's say we're X years in the future and we the last bitcoin has been minted. Since you can no longer incentivize mining new nodes of the blockchain, how will transactions continue to be verified?
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119 views

How does your account get credited when you send bitcoins(ex. Coinbase)

This question might have already been answered. If so, can someone send me the link to it. Let's say I create a blockchain wallet. It gives me a bitcoin address to deposit coins. Once I send bitcoins ...
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237 views

How can I view the Blockchain locally on my machine?

I'd like to view the blockchain on my Windows 7 machine. Right now I'm looking under roaming/Bitcoin/blocks, and trying to open blk00000.dat . I can't read any of it though, it seems the text is ...
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How do I lookup Blockchain sizes for crypto-currencies like Litecoin and Dogecoin?

I am new to mining cryptocurrencies. I am planning to set up a wallet for both Litecoin and Dogecoin. I am just curious on asking what are the current total blockchain sizes of both coins? This is to ...
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229 views

Can someone explain to me how do you read the blockchain.info transaction data?

Ok so i've been using bitcoin for some time now, but i never figured out how to read the blockchain.info transaction data. Here's a sample of what I mean: http://prntscr.com/2dj7tr --- ...
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137 views

Has anyone ever gain control of the blockchain?

I've heard discussion that if you have 51% "hash power" you can effectively accept or reject any changes to the blockchain (and therefore create undeserved gain for yourself) -- my question is - has ...
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180 views

Is Bitcoin database cross platform compatible?

I want to use my Windows 7 Bitcoin database (the block chain I downloaded + my wallets) on Linux (Debian). I run Debian as VirtualBox guest on Windows 7 host and share the Bitcoin data folder ...
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3answers
91 views

address that has never been online, will transactions in blockchain still balance?

I understand that addresses do not have to connect to the bitcoin network/blockchain in order to be valid addresses, but I am mainly wondering about what can be seen in the blockchain if that address ...
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158 views

Do I need the bitcoin blockchain for having a simple wallet using the bitcoind (daemon)?

I want to start playing around a bit with the technical side of Bitcoins (thinking of setting up an exchange). So I built a bitcoind (daemon) binary from source and now the docs say that when I run ...
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565 views

Do you need to download the entire blockchain in order to mine bitcoins?

Do you need to download the entire blockchain in order to mine bitcoins? I'm downloading bitcoin-qt, and I'm afraid it will take up too much memory on my computer. Also, I just read that when another ...
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393 views

Are there any non-monetary uses for the blockchain, or the Bitcoin protocol generally?

After reading "Have there been attempts at a Bitcoin-powered general purpose database?", I'm wondering if any other uses have been made (or proposed) of the blockchain and Bitcoin protocol that aren't ...
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What if a country 100% denominated in a cryptocurrency loses internet connectivity to the rest of the world?

Please assume a small island nation becomes 100% denominated in a cryptocurrency. Now please assume that for some reason the rest of the world manages to cut if off from the rest of the internet for ...
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how does generation of bitcoin wallets work?

so i just realized that when we generate a wallet address on our computer. does the blockchain know that it exists if there was never anything sent to it? If the blockchain doesnt know it exists, ...
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261 views

Getting insufficient funds when trying to send from a watch only wallet on blockchain.info android app

i currently have stored some btc on a paper wallet and have it as watch only on my blockchain.info account. now when i tried to send it out from the paper wallet, i'm getting an insufficient funds ...
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Is there a real threat of so called “>50% attack”?

According to Bitcoin Wiki attacked who has majority of computing power of the bitcoin network can successfully do some nasty things such as potentially book double-spending or prevent transactions ...
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Query unspent ouptuts for arbitrary address

Is there a way to query all unspent outputs for an arbitrary address (which I don't have the private key for), without resorting to a third party service (like Blockchain.info). bitcoind apparently ...
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188 views

Bitcoins Stuck?

This morning I attempted to send BTC to my Bter account from my Mt Gox account. I sent them and they seemed to reappear. I sent them again and there was a little left over, I sent that. Now the ...
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246 views

Mining Bitcoin- Simple Example for transparency

I'm spending a lot of time researching bitcoin before I make any decisions about it, and most of the research is getting to know its fundamental network. Most of the easily verified information is ...
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108 views

How did this block end up on blockchain.info?

How did this happen? https://blockchain.info/block/000000004b7959f66c9dab42b8933f0a43c9705bd9bd486de3a69407fb072cd3 That's a fork of the original blockchain (started from genesis block) which was 9 ...
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263 views

Definition of blockchain height

What is the definition of blockchain height and how is it found/calculated. I get the idea it is related to the SO answer by Gary Rowe, but the word "height" is not mentioned. Yet I see references to ...
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Details on Genesis Block

The question asked here displays the genesis block in pretty good detail. I am still trying to get a breakdown of some of the elements seen here (and some others not seen here): The Merkle Root Time ...
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366 views

Lost bitcoins - Multibit

I have tried to pay an invoice via BitPay, the transaction was stuck at 'seen by one peer' and the BitPay invoice expired. After closing and reopening multibit a few times, I decided to reset ...
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Scalability of namecoin

It seems that an idea to store all information inside a blockchain would lead to its bloating. There are about 250MM of domains in the web, namecoin allows to store 1Kb of data per record, it leads ...
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do transaction merkle trees have any use outside individual blocks?

as i understand it, merkle trees are useful for operations within individual blocks, but do they have any use outside of each block? for example, are the merkle-roots from each block ever used in ...