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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Where can I find a chart of the daily supply?

there is the blockchain.info one for total supply but that very low resolution. I really was a graph of the actual new bitcoin mined on the market on a daily basis because it seems like a strangely ...
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Can you switch the method of blockchain download?

I torrented bootstrap.dat and used am using it to populate the blockchain. It is close to being complete, but my server has ran out of room. There is room for one copy but not enough for two. Is it ...
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Best way to anonymize bitcoin transactions?

https://en.bitcoin.it/wiki/Mixing_service How do sites like this work? "Mixing services". I know it can be broken and traced back with coinsuduko but how exactly does it wash your coins. I doubt they ...
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How to get correct block details url with block height on blockchain.info

I need to generate urls to block details page of blockchain.info when I have block height as input but cant find the relationship between block height and the number they are using in the url. Eg: ...
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Can I use Blockchain API to get number of transactions at BTC address?

When I go to blockchain to look at a BTC address I can see a count of the number of transactions that have been sent to that address. So can I use the blockchain API to get this information? I have ...
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What are the equations to convert between bits and difficulty?

If we take transaction hash 0000000000000006770c3806960539ca83a24facbd99ea212f37f2a0e6a5629a for example. The difficulty as a 32 bit float is 50810339.04827648. The difficulty in bits as an unsigned ...
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json RPC Blockchain not Working

I am unable to connect to the Blockchain API, here is the code: $rpc_host = 'rpc.blockchain.info';$rpc_port = '80'; $rpc_user = 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'; $rpc_pass = 'PASSWORD'; ...
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Bitcoind randomly stops downloading the blockchain

I have bitcoind running from a 2 GB CentOS 6 box in order to check balances of addresses. The problem is that it just randomly stops downloading the blockchain sometimes, and I have to use ./bitcoind ...
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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 ...
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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 ...
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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 ...
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Overview of Blockchain 2.0 smart contracts for the layman?

I have a pretty good understanding of how the Blockchain secures data using hashed inputs of the previous block and being secured by the P2P distributed network. What I'm interested in is a layman ...
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Can I force the Bitcoin core client to keep the blockchain on another drive instead of AppData/Roaming? [duplicate]

I have been profiling my disk space and found that the blockchain has become pretty big 25GB or so. I would like to force the core client to save the chain on another drive that is much larger. Is ...
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40 views

Lost private keys. Help to recover

I have blockchain wallet but have lost the private keys of it, is tr any way to restore my private keys. Plz help
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1answer
42 views

Blockchain command line tools

I was under the assumption that the bitcoind server allowed you to query the blockchain and run commands like bitcoind getbalance on any address. I'm finding out that you may query addresses in your ...
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1answer
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Unconfirmed Transaction >22 hrs

I realise that this might be a duplicate however I have not actually seen a sufficient answer to the question aside from 'wait'. I submitted a transaction yesterday from a blockchain wallet to a ...
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42 views

Tie Breaking in bitcoin transaction

If two nodes broadcast different versions of the next block simultaneously , some nodes may receive one or the other first. In that case, they work on the first one they received but save the other ...
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Have betsofbitco.in deposits been spent?

I recently noticed http://betsofbitco.in/ went dark. Is there a straight-forward way to guess if any of the outstanding deposits have been spent in the mean time? I guess the coin could get rotated ...
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176 views

Where to place Bitcoin bootstrap.dat

I'm sure this has been asked many times before, but I've recently gotten into the whole cryptocurrency thing starting with Dogecoin, and I now want to use Bitcoin as well. I am on Windows 7. I found ...
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How do you create a planet-specific cryptocurrency that will ignore longer block chains from other planets?

I'm sure that cryptocurrencies will play a huge part of the economy across the solar system, when we have colonized many different planets, moons, and asteroids. But there are problems with using a ...
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24 views

multiple parties to sign a transaction before being broadcast (or after, but either way be associated with)

Lets say someone was writing a transaction solely to denote the existence of something, or a timestamp, or writing something in OP_RETURN Could that transaction be signed by other addresses, kind of ...
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How frequent are side-chain reorganizations of various lengths?

I'm wondering if anyone has collected statistics on how often reorganizations of side-chains with length 1 happen in comparison with lengths of 2, 3, or more. Related: What is the longest chain ...
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1answer
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On quering the blockchain, can someone read what transaction took place? [closed]

Like considering the Alice Bob ex where Alice is the customer and Bob is the merchant. If Alice and Bob signed a contract where alice will pay bob on the delivery of a service. The transaction took ...
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1answer
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Blockchain growth projections and risks

What is the projected block chain growth over time and could an attack on Bitcoin be lauched that creating an enourmous number of micro-transations to fracture the currency (e.g. spamming the system ...
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Block nonce predictable

Is the block nonce predictable in any way? It seems to be a proof of work on his own just like the block hash, but may a miner force a mined block to have a specific nonce? (if his hashrate allows him ...
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36 views

Include checksum in a transaction

Is it possible to include a file's checksum in a transaction? Not necessarily in Bitcoin's current blockchain due to the now limited OP_RETURN feature, but just in the blockchain/transaction concept ...
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1answer
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How does NXT prevent blockchain bloat since it does so many different things with its blockchain?

How does NXT prevent blockchain bloat since it has a built in message system and other features? Wouldn't the NXT blockchain grow to be really big in the future and pose a problem for people storing ...
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Why does Bitcoin store all transaction inputs and outputs, instead of just an “account/balance” ledger?

From what I can tell, the Ethereum blockchain just stores accounts and balances - why did the original Bitcoin developers choose the method of storing all transactions for validation instead of just ...
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Blockchain Pairing API

Have anyone of you figured out how can we use devices pairing in 3rd party applications? I've found that pairing QRCode looks like this: "1|<blockchain_login>|<some_hash>", where ...
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Strongest vs Longest chain and orphaned blocks

Satoshi writes at the bottom of page 3 of his white paper that "If two nodes broadcast different versions of the next block simultaneously, some nodes may receive one or the other first. In that case, ...
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Is it possible that someone forks the chain?

I'm not sure I understood everything but all the clients always keep the longest chain, ok. So, what happen if an evil person inject bad transactions in a block and successfully mine it (given the ...
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59 views

Confirmation limit

When seeing transactions I see that the number of confirmations keeps increasing without any limit. I wanted to know if there is any time limit on including a already confirmed transaction in a block ...
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3answers
91 views

How To Lower The Disk Space Needed For Full Blockchain?

I'm looking to run bitcoind on a virtual machine. However the main nets Blockchain size is over 21GB, and growing. Is there a way to compress this down or lower the amount of disk-space needed for ...
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New To Bitcoin…Please Help! Bitcoin not received from sender to Armory Wallet!

I am in desperate need of assistance! I am new to Bitcoin so please apologies for the lack of knowledge in these matters guys....We all have to start somewhere ;) I sent my Bitcoins from the ...
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38 views

Blockchain and Bitcoin client difference of amount

I just made a transfer of 0.06 BTC, you can look it up on Blockchain.info The problem now is that my receiving client (Multibit) doesn't show those 0.06 BTC, it only shows 0.0001 BTC have been spend ...
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1answer
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Can you assume that all inputs to a Bitcoin transaction are controlled by the same person?

When you are looking at a Bicoin transaction in the block chain and it has inputs from multiple addresses is it safe to assume that those addresses are all controlled by the same ...
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1answer
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What percentage of Bitcoins stored in a multi sign address?

I am looking for a statistic of the usage of multi-sig addresses over time. More concrete: what is the percentage of Bitcoins stored in a multi-sig address over time.
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What is current size of various databases in Bitcoin Core as of July 2014?

This question is related to question: What is the database for? What is size in MB of: blockchain itsef - blocks/blk*.dat blocks/index/* chainstate/* blocks/rev*.dat Is the size of chainstate and ...
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Are NXT messages stored on the blockchain and are they encrypted or publicly viewable?

Are nxt messages stored on the blockchain? What is the character limit on these messages? And are the messages encrypted or publically viewable? If they are public, is there a site to just view all ...
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38 views

getrawtransaction doesn't work for every transaction with -txindex=1?

i put txindex=1 in bitcoin config and reindex blockchain after that when i call getrawtransaction for some transactions didn't exist in my wallet and work well like: [Working] getrawtransaction ...
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What are the keys used in the blockchain levelDB (ie what are the key:value pairs)?

I am wondering if I can use node.js and levelup to access a copy of the blockchain database directly. But from what I can see, I need to know the name of the key(s) before I can get any data, as this ...
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136 views

How big is the NXT blockchain in disk usage compared to the Bitcoin Blockchain as of June 2014? And rate of increase?

Currently I'm looking for the disk usage size of the NXT and Bitcoin blockchain size as of June 2014 and the current rate of of increase every day/week/year?
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48 views

What determines how many transactions end up in a given block?

What determines how many transactions end up in a given block? Blocks can have various numbers of transactions, so what decides how many are in a certain block?
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How do I prevent Bitcoin-qt from having to keep reindexing the blockchain?

Is it likely that anti-malware or anti-virus software is causing this issue? (I have told such programs to exclude the Bitcoin folders from scans)
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What is the best way to implement withdrawal in online service?

Suppose we have a service, which holds user balance in Bitcoin. How to implement withdrawal from bitcoin perspective? Which RPC call to use? How to archive transaction to have a proof of sending ...
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blockchain - strange problem

I have Windows 7 and i’m using the bitcoin-qt client v0.8.6-beta. Last night i tried to open up the client – but there was a message that said i had some issues with the blockchain. Which is weird, i ...
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Custom altcoin won't sync with node and neither will accept a miner connection

I forked the BlackCoin source, changed the ports, generated the genesis block, merkle, blah blah blah. I set up a node on a DigitalOcean server and compiled my coin daemon there as well as on my local ...
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1answer
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Created genesis block and set up node. How to mine?

Everything seems to be going well creating my altcoin for fun. I forked the BlackCoin source on Ubuntu, successfully mined a genesis block, recompiled. I bought a droplet over on digitalocean running ...
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Why is my new altcoin trying to connect to peers and sees almost 200k blocks remaining?

I downloaded and forked the Blackcoin source code. I changed all of the references to BlackCoin, changed the pszTimestamp string along with the current Unix timestamp. Then, I successfully mined the ...
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Miners produced/ing duplicated hash values

This transaction is contained in two MainChain-Blocks: https://blockchain.info/tx/e3bf3d07d4b0375638d5f1db5255fe07ba2c4cb067cd81b84ee974b6585fb468 On Blockexplorer there is a note of this anomaly: ...