The blockchain is a list of all transactions that have occurred using the Bitcoin currency. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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Could Bitcoins (or any other blockchain based cryptocurrency) feasibly ever be used for purchases that need to go through fast?

Today, one of the problems with cryptocurrencies like Bitcoin is that it takes quite some time for a transfer to go through and enough confirmations to take place. This really isn't a problem when it ...
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18 views

Service that displays how many inputs/outputs there are in the blockchain?

Ideally, I am looking for a service like http://statoshi.info/, but one that displays the real-time number of inputs and outputs in the blockchain. Note that I am not looking for information on the ...
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27 views

Can bitcoin and altcoin co-exist in sidechain? If Yes, strategy

I have private block chain - tweaked bitcoin blockchain with a private coin by creating a Genesis block. Lets call it "PrivateCoin" I also have a sidechain elements/alpha instance, I effectively ...
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Bitcoin Forwarding Services? [on hold]

Anyone can tell me some bitcoin forwarding services? apart of blockcypher blockchain and block.io? Thanks!
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Problems with Blockchain API

Im having problems because when a user pay to a forwarding address, the forward address receives bitcoins instantly, but takes nearly 1 hour to send those bitcoins to the destination address, the real ...
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Multiple transactions from a single wallet in one block [duplicate]

I am trying to understand how it would be (and if it is) possible for a single wallet address to have more than one transaction in a single block? Does a previous transaction of a wallet address need ...
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48 views

Is there a (potential) “Blockchain size problem”, and what solutions are available?

As more and more Bitcoin transactions are produced, the growth of the Blockchain may well, one day, become a problem for systems which want (need?) to store the whole blockchain. Storage usage ...
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New to Bitcoin and Blockchain - Want to meet? [closed]

I'm absolutely new to blockchain technology and bitcoin (I know this statement creates emotional bias like "another rookie have found stack exchange" or "eternal september biases", and I appreciate ...
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2answers
103 views

Sending funds on same block of received funds. Confirm sending not received?

My question in quite conceptual: For creating a raw transaction, I just need the txid from the older transaction and the address to send it. Put the funds, the change, what's left is the fee. Sign it ...
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21 views

How to apply blockchaining to data?

I would like to apply blockchaining on unstructured data (any kind of data). I have seen BlockSign use similar concept to sign a document by storing a hash of the document in OP_RETURN block of ...
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Is a private blockchain better in any sense than a database?

Since the banks appear to be currently looking into the idea of "blockchains" but don't want to be dealing with "Bitcoin", it seems that there is a lot of hype for private blockchains out there like ...
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How to get receiving transaction information from bitcoind (bitcoin server)

I installed bitcoind on a vps and generated an address I sent some bitcoins to from Blockchain.info wallet. One day later, I still don't see any info about it in bitcoind while there are now 75 ...
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Blockchain - How can I cancel my blockchain transaction, unconfirmed after +1 day

I am using blockchain.info. I have made a bitcoin transaction of 4.79 BTC to the address 1DWaEfPbcKQvjMi9D9eNMrVRQzWiSLVvaS. (exchanger) You can see the transaction at ...
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29 views

Selfish Mining: stale or orphan?

In terms of a selfish attack many sources speak of orphaned blocks, i.e. blocks that are not on the main chain and thus not paying any coinbase transaction to its miner. Still I'm not sure and ...
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How to monitor the blockchain for new blocks

I want to scan new transactions as they are added to the block chain. Does anyone have a suggestion on how to do this. Are there any APIs that allow for this? Or is there a way to directly tap into ...
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BitCoin Api, Result Keys,BitCoin Protocol documentation

I am developing android application using https ://blockchain.info/api. i am having problem to understand the Keywords used in result for https: //blockchain.info/address/$bitcoin_address?format=json. ...
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What if block N were based not on N-1 but on both N-2 and N-3?

If the bitcoin protocol were changed so that the merkle root from block N-1 were replaced in block N by the two roots of blocks N-2 and N-3, then it would become possible to mine 2 blocks at a time in ...
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132 views

Why does bitcoin core need to download the blockchain

I understand that the blockchain is what keeps track of who has what coins and makes sure that everything is correct and secure, but why do I have to download it? Isn't that where the miners come in? ...
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BlockChain API playground OR SandBox?

I am android developer. I have used https://blockchain.info/api/blockchain_wallet_api API for my application But the problem is now how can I test my application (transactions) with out having ...
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38 views

Getting bitcoin globe data

I just saw this bitcoin globe https://blockchain.info/nodes-globe?series=topBlockRelay It has two modes,"Online Now" and "Miners". I wanted to ask if anyone knows what the bars and colors stand for ...
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How does the bitcoin network recover in case of a hash collision in the block hash?

A Bitcoin client has to download the whole blockchain from the P2P network in order to become a full node. A full node is able to determine, if a transaction in the network is valid or not. To ...
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2answers
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Ubuntu. (blockchain of version 0.9.3 compatible with 0.10.1?)

I have version 0.9.3 of bitcoind on my Ubuntu server and I want to upgrade to 0.10.1, I have nothing in my wallet. Does the blockchain 0.9.3 compatible with 0.10.1? Do I have anything to keep from ...
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Blockchain API whitelist all IP addresses

I am currently trying to implement the blockchain API in my application. I have done this successfully however, I am having trouble whitelisting IPs. Each time a user accesses the app with a different ...
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45 views

Block Chain Library

I was wondering if there are any open source blockchain libs that I could use to build a project with? Thanks
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89 views

Stress test? Whats it for?

How long does the stress test usually last on the blockchain? Also what is it for? I'm fairly new to bitcoin and was having trouble processing transactions in a fair amount of time earlier.
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How to access peer's tip of chain?

In case I'm a selfish miner and have successfully forked the blockchain, I'd like to know the state of progress of my honest nodes at any given time - how can I achieve this? Do peers on separate ...
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How to access locally stored inventory data?

I'm looking for objects in the source code of Bitcoin Core that record all block inventories distinguished by their miners - Is there a container that keeps track of blocks on chainActive and stores ...
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C# parse bitcoin blockchain to get balance of an address

Is there a way to scan the Bitcoin blockchain in C# without using an external API? I am looking for the amount of spendable money of a Bitcoin address. I am using NBitcoin. // create new key pair ...
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37 views

What is the mechanism of determining the transactions of a new block

I am newbie in the Bitcoin field. I have read about the transactions, blocks, blockchain and other materials. As I know, when a new valid block is found and announced by a user, other users start ...
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32 views

Bitcoin resistance against forged slow chain

I'm implementing a new protocol with a custom blockchain, and I'm trying to figure out what is the correct way to deal with the "slow chain" problem. In the Bitcoin protocol, nodes constantly gossip ...
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18 views

Source for blockchain dump in machine readable format

Where to get blockchain dump in machine readable format. Text files of JSON will be perfect . I found PSQL database at http://dumps.webbtc.com/bitcoin/ . Any other source?
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Where can I direct download the NXT blockchain data instead of from the client?

When installing the nxt nrs client from scratch I need to redownload the nxt_db database blockchain. Is there a place where I can just download it from directly on a fast connection? It seems that it ...
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2answers
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What security threats does blockchain technology solve or present?

I am interested in security, identity and authenticity in electronic networks. What sort of security concerns could blockchain technology help with and what sort does it pose? Are there entry and ...
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blockchain.info transaction timestamps set into the future

There seem to be some irregularities with Blockchain.info's transaction timestamp (aka Received Time) for a set of blocks. The transaction times are recorded with unix timestamps well into the future ...
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What are the best criticisms of blockchain technology?

What are the best criticisms of blockchain technology? Specifically, what are the top flaws of the blockchain as it's currently implemented by Bitcoin?
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Amount of block locator hashes in “getblocks” message

How many block locator hashes are sent in a getblocks message? And how distant are these locator hashes from one another?
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What are some causes for long chains?

Blockchain.info shows a graph of transactions excluding "long chains" of more than 10: https://blockchain.info/charts/n-transactions-excluding-chains-longer-than-10 This seems to indicate that ~68% ...
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1answer
88 views

How to accept payments with Blockchain in PHP

I am trying to set up sort of a BitPay system where 1) User selects how much money they want to send (price in BTC) 2) PHP Gives user amount of money they need to pay and the address they need to ...
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bc.info transactions with no timestamp

The last transaction in blocks 219882, 219888, and 219892 don't have a timestamp. And by last transaction I mean the last transaction shown in the json file. 219882 219888 219892 I find this to ...
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Are there any blockchain inspection tools/libraries?

I am going to write software that gets information from the blockchain directly. Are there any tools or libraries to speed up that process? I am looking for things like decoding and encoding ...
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47 views

Raw Block data in Hexadecimals

Is there any Web API available for us to query Blockchain data in hex format? The format should follow the standard (https://en.bitcoin.it/wiki/Block#Block_structure) structure rather than JSON.
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Is this pattern a tracking method or just a Bitcoin wallet making change to itself?

While following a particular transaction from a donation received in 2011 I noticed a pattern in the block chain. The entity donating would send .001 to an address and the remainder of the wallet ...
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What can a dishonest node do (or try to do)?

Except this kind of attacks: https://en.bitcoin.it/wiki/Double-spending For example can he simply create a new block that includes some invented transactions that steal money from real address? ...
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Bought a bitcoin, sender said it was sent, not showing in blockchain or wallet. Where is it?

So I bought a full btc off of localbitcoin with amazon giftcard code. I sent the code and clicked that payment was completed. It's been about 2 hours. About 1 hour since he said that he sent the ...
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Why the same confirmed transaction in the Testnet has different block hash and other fields?

Chain.com http://explorer.chain.com/transactions/a4bfb8e21ae3d6232183dfb8ef5fcee8c9b8f223c2d25738e24765a75abd009b Chain.so ...
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1answer
46 views

Why does Bitcoin-QT not seem to be catching up on my Mac?

I've had Bitcoin-QT running for about six total hours, and the rate at which it's catching up is glacial at best. It takes about an hour to advance a week, which would make the process take about 4 ...
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64 views

Erroneous blockchain transactions…more coins than I specified! [duplicate]

This isn't directly related to Bitcoin; rather this is related to Infinitecoin, however the technologies are virtually the same. The other day I sent 2,000 IFC from my wallet (Infinitecoin-QT for ...
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193 views

How can I run bitcoind in pruning mode?

I read this comment: You could consider running a pruning node, which is practically the same as a full node (including security), except it throws away some of the old history. Version 0.11 ...
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Blockchain over 36GB and causing disk space issues

I want to install the bitcoind daemon on a computer with relatively little free space (about 35GB available). I thought that the blockchain was some 20 GB in size and figured that would be no problem, ...
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Call function for block n on blockchain

I've been going through main.cpp in order to roughly find out which function calls the best block and I found out depending on situation there are several similar-sounding function names and code ...