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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2answers
133 views

Wouldn't bitcoin benefit from distributing partial blockchains over each node?

Why doesn't each node store only a portion of the blockchain? For example, if you had 100 nodes, each node would store 10% of the blockchain. This would amount to significant overlap of each aspect ...
2
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0answers
68 views

Bitcoin .11 Initial Blockchain Download Problem with OS X 10.10

I am loading the blockchain for a new wallet. Initially I had problems due to ISP issues. This issue is fixed and I now have 8 outbound connections working well with ping times ranging from 50-800 ms. ...
1
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1answer
261 views

What does it mean ERROR code=-28, message=Activating best chain?

I am using insight-api for get block chain information. When i am trying to start insight i am getting error "ERROR code=-28, message=Activating best chain..." . I saw this error first time,please ...
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0answers
15 views

Node Operators Reward [duplicate]

Why don't we implement a Node Operator reward program (in the core) or if such implementation ever existed what would be the overall (Downside,Cause for concern, etc) Why don't we use the Miner Fee ...
1
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0answers
148 views

Basic transaction validation rules, Node accept to pool policy

I am trying to collect all infromation about adding and verification transaction to Blockchain. Exist 2 types : add transaction to RawMemPool and add Transations included in block. Could any ...
10
votes
1answer
474 views

Is there some client like Bitcoin core, but which highly compresses the blockchain?

I have been using Bitcoin Core for some months. I need a fully fledged client as I want to help the Bitcoin network. But the blockchain is so huge. I'd love to see some other client, which highly ...
2
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0answers
45 views

What happens when Bitcoin's blockchain grows to 1 Terabyte in size? [duplicate]

If bitcoin is to succeed surely the blockchain design has to be redone. Are there any other cyrptocurrencies with a different blockchain design than bitcoin?
4
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1answer
135 views

Blockchain Application

I am currently doing a project that requires blockchain to be applied to other systems. I was wondering where I can easily download the blockchain database and which is the best way of understanding ...
2
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1answer
122 views

How to synchronize with the bitcoin blockchain via bitcoinJ

I'am writing my very first application using bitcoinJ api and I got a bit stuck. Maybe somebody can tell me what I am missing. My practice app wants to write a sample contract in the bitcoin ...
1
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1answer
115 views

Merging blockchains after algo change

I have a question for the community and im hoping a few informed individuals could get me some insight. When a cryptocoin changes algorithm (eg. scrypt to X11), how does one achieve the merging of ...
2
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1answer
61 views

Get blockchain info for exchange transaction

I'm sorry in advanced if this questions are dumb but here goes ... Does all buy/sell bitcoin related transactions made in exchanges get logged in the blockchain? if so can they be found and/or ...
1
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2answers
171 views

Can a smart mind explain block difficulty calculation in lay terms?

I tried to read it here: https://en.bitcoin.it/wiki/Difficulty But it is closer to a rigorous math proof than to an explanation. I am interested to understand that so I can understand what makes a ...
2
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2answers
175 views

How can a block be considered more difficult to solve/hash than another one?

In this answer: http://bitcoin.stackexchange.com/a/760/28219 It is said: Because of all this work, when a Bitcoin client signs on to the network it can trust the block chain that was most ...
3
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2answers
166 views

When does a miner decide to stop collecting transactions and start calculating hashes to try to win?

I am confused about whether a miner chooses to wait for more transactions (more fees) or starts as soon as it receives the first transaction from the network. Once a miner has started calculating the ...
3
votes
1answer
131 views

What is the protection against a malicious node with a bad block chain?

How does a bitcoin node protects against connecting to a node with a forged block chain? How does it say: "Ok, I just got this block chain and it is a valid/legit one" ?
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0answers
29 views

Validate chain from `valid-headers` to `valid-fork`

The getchaintips JSON-RPC returns multiple branches of the blockchain. Chain tips can be in various statuses. The active and valid-fork are already validated chains. There is a valid-header ...
3
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5answers
2k views

How to store data on the blockchain?

I am wondering if it is possible to give someone a bitcoin transaction ID and with that he can read some hidden data, like the blockchain.info notes on transactions, but for real, stored in the ...
2
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0answers
55 views

Get as many blocks as possible (stale, invalid, orphans)

I would like to download (and access) as much blocks as possible - including stale (extinct) blocks, orphans blocks and invalid blocks. I have 0.11 official client. My node is already synchronized but ...
1
vote
2answers
235 views

Fastest filesystem for blockchain?

I am running Linux with a harddisk. Currently the blockchain is on an NTFS partition, which probably isn't the fastest. Which filesystem should I choose? As I understand it, a Bitcoin node will only ...
2
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1answer
155 views

Is it possible for computing power to increase quick enough to break mining retargeting?

So from what I understand, mining bitcoins basically becomes more difficult as more bitcoins are mined. This is done so computing power doesn't get so strong that bitcoin mining becomes trivial to ...
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3answers
92 views

Wanted to back up blockchain to save space, now I cannot open bitcoin QT?

I wanted to back up the blockchain on my hard drive as it took around 50 GB on my laptop. I did so and deleted all the blk000.dat and the rev000.dat from (~/Library/Application Support/Bitcoin/) which ...
3
votes
1answer
84 views

Best method for getting bulk address information (total sent, received, and final balance)

I need to go through a large list (about 100 000) of bitcoin addresses, and, if they have a final balance, find that as well as the total sent and recieved. I am working in python, and I have looked ...
0
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1answer
310 views

Why hasn't my bitcoin transaction gone through?

So about 3hrs from now I made a transaction to a different wallet of mine and the money didnt come through in 20mins I checked the blockchain and the number of confirmations kept rising and its up to ...
3
votes
1answer
335 views

How to handle POST data sent from Blockcypher WebHook API

I've been trying to get this to work for the past 3 days and I've all but given up on it. Basically, I've used requestb.in to monitor if any POST requests are going through; requestb.in always ...
0
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1answer
253 views

Please help! How do I transfer my wallet from bitcoin core to MultibitHD?

I (should by now) have bitcoins in my wallet,I sent them to my wallet whilst i was using bitcoin core but after taking days to sync (and it still hasn't synced) i have given up and installed ...
1
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0answers
58 views

Is there a service that can track how a coin flows from one wallet to another visually?

I sent some coins to an address and would like to track how these coins are flowing into other wallets. Is there a service that shows this visually? My main point is that I want to know if these coins ...
0
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1answer
35 views

Can a client leave its mark on the blockchain?

Would it be possible for a client (eg the core client) to leave its mark in the form of META data on the blockchain or even in the mempool so that we know that this client was used to create or send ...
1
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1answer
140 views

POS Receipt payment identification

Lets have a scenario where POS software wants to support bitcoin payments with zero risk. Ideal is to store Merchant's Bitcoin address in POS settings. The intention here is to uniquelly bind receipt ...
2
votes
1answer
102 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 ...
0
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1answer
122 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 ...
0
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0answers
6 views

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 ...
3
votes
2answers
1k 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 ...
1
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2answers
137 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 ...
0
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2answers
151 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 ...
22
votes
6answers
4k views

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 ...
0
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0answers
50 views

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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1answer
78 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 ...
0
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3answers
291 views

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 ...
2
votes
1answer
45 views

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 ...
4
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3answers
411 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? ...
1
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1answer
263 views

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 ...
0
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2answers
93 views

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 ...
-2
votes
1answer
362 views

Block Chain Library

I was wondering if there are any open source blockchain libs that I could use to build a project with? UPDATED I agree. With my knowledge of bitcoin now and blockchain - I should have phrased this ...
4
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1answer
121 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.
0
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1answer
53 views

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 ...
1
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0answers
57 views

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 ...
2
votes
0answers
218 views

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 ...
0
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1answer
140 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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1answer
64 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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0answers
94 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?