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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How to find a specific bitcoin address from all the addresses?

Recently, I found a site that show all the addresses in a huge list, divided in 904625697166532776746648320380374280100293470930272690489102837043110636675 pages. The site's link is ...
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2answers
20 views

How much binary data (bytes) could I put in a transaction and how?

I know that some people had put text, pdf and images in the blockchain. I wonder which are the limits in order to have a minimum "bytes/btc" value in regarding the blockchain as a permanent database. ...
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1answer
28 views

Blockchain Parser not working on blockchain generated in regtest mode using bitcoind. Any help?

Has anyone used this blockchain parser for Bitcoin https://code.google.com/p/blockchain/ ? http://codesuppository.blogspot.in/2014/01/a-command-line-interface-for-blockchain.html I tried to parse ...
0
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1answer
23 views

Bitcoin-qt and lost local blockchain files

For some reason I've lost all data in my .bitcoin directory except the wallet.dat file. Now bitcoin-qt shows 0 balance, and it's 5 years behind sync. Is this possible to restore coins in this case?
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1answer
14 views

Local Testnet3, where do the new coins get sent to?

I'm trying to setup a local testnet with multiple nodes. Currently I have three nodes, and their mining powers are almost the same. When I use listaccounts RPC call, all the wallets have 0 coins. ...
0
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1answer
23 views

Why do Bitcoin API services offer Block details?

I understand having APIs around addresses and transactions, but I'm less clear why I need to know what's happening with a Block(s). This is to confirm one's transactions? Might someone provide some ...
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1answer
24 views

Bitcoin testnet: “Bitcoin is downloading blocks…” and other problem

I'm trying to setup a local testnet with multiple nodes. Currently I have three nodes, and their mining powers are almost the same. Things have been quite ok so far, except some problems that I need ...
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2answers
58 views

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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1answer
79 views

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 ...
0
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1answer
59 views

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 ...
2
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2answers
61 views

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: ...
4
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1answer
31 views

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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1answer
52 views

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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0answers
16 views

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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0answers
19 views

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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2answers
64 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 ...
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2answers
51 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 ...
4
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4answers
173 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 ...
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0answers
34 views

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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6 views

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 ...
0
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1answer
41 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
49 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
37 views

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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1answer
58 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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38 views
+50

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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2answers
231 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 ...
7
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2answers
99 views

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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1answer
26 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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0answers
26 views

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 ...
2
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1answer
28 views

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 ...
2
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1answer
45 views

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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2answers
59 views

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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1answer
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 ...
4
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1answer
50 views

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 ...
3
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2answers
582 views

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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0answers
14 views

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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1answer
107 views

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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1answer
56 views

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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1answer
60 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
94 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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0answers
36 views

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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1answer
39 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 ...
2
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1answer
55 views

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 ...
4
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1answer
84 views

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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1answer
74 views

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 ...
2
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2answers
76 views

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 ...
0
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1answer
45 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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2answers
128 views

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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1answer
140 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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1answer
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?