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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3
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1answer
32 views

Could block chain technology be used to implement a verifiable voting system

from an efficiency point of view, voting at elections online seems to make alot of sense except there is currently no way to have a completely trustable electronic voting system because of the lack of ...
12
votes
4answers
6k views

Reliable, efficient way to parse the blockchain into a SQL database

I need to generate a SQL database (preferably SQLite3) of every transaction that has occurred in the blockchain. Is there an efficient way to do this using open-source software? I'm attempting to do ...
2
votes
2answers
530 views

How do I get testnet block height?

Like I would do wget -O - http://blockchain.info/q/getblockcount 2>/dev/null for the main net.
5
votes
0answers
20 views

Can*t call chainActive.Tip()->nHeight in core.cpp

i want to call chainActive.Tip()->nHeight in core.cpp. It is but not possible. I am happy for every idea. https://github.com/LIMXTEC/BitSend/blob/DEV-joshafest/src/core.cpp Here is a example bool ...
5
votes
2answers
55 views

What does the blockchain represent?

What does the blockchain represent? Is it the current balance of each account or is it the complete ledger?
2
votes
1answer
55 views

How to apply RBF (Replace-by-Fee)

I got a stuck transaction and would like to clear this. I found many information about RBF (Replace-by-Fee) how it works etc. So i think this might be the best option to get my transaction going. ...
-2
votes
0answers
14 views

how to spend double the normal liquidity [on hold]

My blockchain be spending double that liquidity does not currently as always, it is up lines An outpoint is already spent in [ DBBitcoinTx { txIndex = 156842103 , ip = 2130706433 , time = 1466676067 , ...
0
votes
0answers
9 views

Need help on Unconfirmed transaction [duplicate]

I have moved btc between wallets in blockchain, and i gave less fees unknowingly without knowing the block size. https://blockchain.info/tx/...
2
votes
2answers
94 views

Why DARPA wants blockchain based secure messaging system

DARPA (US Defense Advanced Research Projects Agency) has released a Request for Proposal for a Secure Messaging Platform using a blockchain framework. The following is the Objective paragraph from ...
10
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5answers
4k views

How to check Bitcoind block chain download progress level

I have installed bitcoind on ubuntu server, and when I run screen -x for btc it says error -10 blockchain is downloading. How do I know the progress level? currently 125600 blocks are downloaded, but ...
2
votes
1answer
111 views

Bitcoin core stopped sync'ing (without downloading all the data). How can I make it resume the synchronization?

I really need your expertise guys. I am extremely new to this concept but just decided to try. Unfortunately I did not do my homework before playing with my money. I bought some coins and I sent them ...
2
votes
1answer
260 views

When no Bitcoins are left to be mined, how will the Blockchain continue to be validated? [duplicate]

Sorry, this may be noobily phrased. My understanding was that each individual "miner" crosschecks and validates the overall blockchain, ensuring decentralized verification of the bitcoin transactions. ...
17
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1answer
4k views

What is the database for?

I see the block chain is stored according to the block chain format specification. But I also see there is a database, which is currently a leveldb database. Why is the block chain stored in two ...
2
votes
1answer
53 views

Payment has not arrived at destination!

I do not know yet whether is this transaction is confirmed or not because not yet reached the destination !! https://blockchain.info/tx/962a428acb10ed071b1cf954cbaf763016751b986429df5268424880ee95a7d6....
0
votes
1answer
272 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 ...
0
votes
0answers
22 views

Why Does Litecoin Transaction Show Zero Confirmations for last 3 hours

I tried sending 193.09 LTC from my mobile wallet. There wasn't an option for how much of a fee to add to the transaction, so I just sent as is. It took a long time to send from my phone and then once ...
2
votes
1answer
154 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 ...
4
votes
1answer
106 views

Would this scheme allow faster verification of transactions? (Multiple parallel block chains)

One issue with one block chain is that it needs to be globally synchronized. One way to elevate this would be to use multiblock chains. Namely, we can imagine that there are N block chains, working ...
4
votes
2answers
123 views

Size of the blockchain after pruning

What is the size of the blockchain stored on a user harddrive after pruning has occurred?
4
votes
1answer
833 views

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, ...
2
votes
1answer
287 views

Unconfirmed/pending transaction in MultiBit no longer exists, but my coin is still gone!

Last night, I transferred some coin to my MultiBit local wallet, which worked fine. Then I tried sending some to another wallet, and the transaction showed up as "unconfirmed/pending" after taking my ...
0
votes
0answers
37 views

Where do I find a comprehensive list of all bitcoin hash creators?

For a research project I am looking for a comprehensive list of bitcoin hash creators. How can I access this information? Any help is greatly appreciated.
1
vote
3answers
48 views

Accessing Testnet [duplicate]

Can i access the testnet without downloading the blockchain? im developing a software to do a testnet (later it will be in mainnet) transaction with a custom message embedded into OP_RETURN. if the ...
1
vote
1answer
55 views

OP_RETURN custom message in testnet transaction

I would like to do a bitcoin transaction in testnet by embedding a custom message in the OP_RETURN. do i have to download the bitcoin core client with and the block chain to do that? or can i use a ...
5
votes
2answers
77 views

Would moving a transaction from an old block to a new one allow more pruning?

At Pruning the branches in Merkle Tree Nick ODell writes "A leaf (transaction) can be pruned when all of its outputs have been spent." So I was thinking that if a transaction is one of the last few in ...
0
votes
1answer
44 views

can I use elements of the blockchain to protect the integrity of a leaderboard without central servers?

For a World of Warcraft community feature conception contest I've come up with something that involves a leaderboard. However, World of Warcraft addons are purely individual, so a centralize platform ...
9
votes
2answers
1k views

How often does a block have only one transaction?

I was looking at blocks on blockchain.info, and came across this one with only one transaction in it: (the mining reward one) https://blockchain.info/block-index/512049/...
3
votes
2answers
95 views

Is it possible for an individual to start their own blockchain working with Bitcoin Core?

Is it possible for an individual to create their own blockchain from Bitcoin Core? I think the value of BTC is currently controlled by miners in China and I want to create a blockchain with either a ...
3
votes
2answers
36 views

Can bitcoin node startup be secure without validating the entire blockchain?

One of the largest hurdles in my mind to increasing the number of full nodes operating is the startup cost related to downloading the blockchain. A similar but less important (in my mind) issue is ...
0
votes
2answers
48 views

Issue transaction without being online

Is there some way in which User A who could load a transaction onto the block chain and if some other User B who is willing to pay User A, without User A being online could release the loaded ...
0
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0answers
30 views

Inconsistent Results with Blockchain Data API

I'm using the Blockchain API library (Python, v1) from blockchain.info available on GitHub. The blockexplorer.py module provides functions for obtaining blocks from the blockchain, specifically ...
1
vote
0answers
36 views

Is there any library to process scriptSig script in transaction, and other scripts?

I'm trying to parse hex representation of scriptSig, in normal transactions there are variable int, r&s, pubkey. But some are really weird, like those ones: ...
2
votes
2answers
76 views

getting bitcoin address of blk*.dat files

I know that getting the address from the blk*.dat files is discussed a lot of times. But I don't get it why? When I have the raw scriptSig I can encode it and get the bitcoin address or not? E.g. the ...
0
votes
1answer
32 views

Size of Blockchain for huge smart contracts database

Let's say I want to use smart contracts for huge collection of data. Since it will be distributed so downloading on every participant computers isn't this a huge problem ?
12
votes
3answers
8k views

Knowing a single transaction can you track down a Bitcoin user?

I have used this transaction to donate to Wikileaks. I have applied no special techniques to obsure my identity. How much information can find out about me on the blockchain. What tools would you use? ...
0
votes
0answers
72 views

What's difference between Multichain, Chain, Hyperledger, Ethereum etc

I stumbled upon multiple Blockchain protocols framework. For example Multichain http://www.multichain.com/ What's difference between this one and the others ?
0
votes
1answer
63 views

I try to run username crawler of twister core

I am trying to run usernameCrawler.py file of twister-core. I have taken the following steps: I have built twister I used this command to run twister: ./twisterd -rpcuser=user -rpcpassword=pwd -...
1
vote
1answer
35 views

Miners influence [closed]

How many people represents the bitcoin's minors? Thousands ? Hundreds ? Or just a few organization controlled by a minority of people that possess the means to run minig plants? https://www.youtube....
3
votes
2answers
35 views

Is there a multi Sig Explorer or Stats provider?

Is there a resource where I can get the past and current number of multi sig transactions, all types?
1
vote
1answer
78 views

What can I do with Bitcoin Core to see my current balance?

I've waited 4 days now for Bitcoin Core v0.12.0 to synchronise the network and its getting really frustrating, especially when I still have 2 years and 38 weeks worth of the blockchain to download. ...
0
votes
3answers
57 views

Is there a chance that bitcoin will be use as the Universal Currency around the Universe? [closed]

I'm fascinated on how bitcoin and blockchain works. So now I'm thinking if this is possible? A universal currency named Bitcoin? Being used by Asians, Blacks, Americans, Atheist, or Aliens?
4
votes
2answers
73 views

Is there a possibility that the whole blockchain system will be DOWN?

I want to know if there is a possibility that all of our hard-earned bitcoins will turn to dust if the Blockchain system will get shut down or stop. Is this possible? I really have a big question mark ...
1
vote
2answers
47 views

Is there any bitcoin fork which goal is storing arbitrary information?

I know that there is Namecoin, which saves key:value pair. Is thete other similar solutions? Maybe for arbitrary textblocks? Update: how they do it? Delaware Blockchain Initiative to Streamline ...
1
vote
2answers
112 views

Bitcoin-QT: which external memory (connected via USB2.0 + TrueCrypt) would work?

Background I have Bitcoin-QT 0.9.3 (zip version). bitcoin-qt.exe sits on the internal HDD of my laptop. All of the other stuff (blockchain, wallet,...) on a 128GB USB drive, fully encrypted with ...
1
vote
1answer
58 views

What are some forks of Bitcoin that ultimately failed?

Being as many of the popular cryptos today were forked from Bitcoin at some point, I'm curious which past forks seemed promising, but ultimately failed at some point.. Sort of a history lesson if you ...
-1
votes
2answers
46 views

what about that the adress change all the time? [duplicate]

if the address has changed in my wallet could I still receive funds on the old one?? because the address has changed a lot of times by its own without I have change it
5
votes
3answers
144 views

Blockchain Tools for Voting Among Small Groups?

I am considering starting a new co-op based business. Since the business will be member-owned, it would be nice to launch the business with a voting tool. I want to be able to propose items to the co-...
0
votes
1answer
42 views

Need help to understand where bitcoin transaction has gone

I am new with bitcoin and I need some help from experienced members. I have a server with bitcoin core where we accept some payments and use bitcoin core as mercant. The problem is that we have got ...
0
votes
1answer
131 views

Bitcoin gone with “this transaction is not yet conformed”

I sent my bitcoins from my multibit wallet, first I did a a test spend which came across and then I sent all my coins. The transaction got a triangle icon and the text "this transaction is not yet ...
2
votes
1answer
119 views

How can I manually add a receiving address in MultiBit Classic Wallet - disconnected during confirmation

Open to any suggestions... (Original Question is below and am trying advice from the first answer) I am in the process of looking at all the deleted files on the USB disk where MultiBit resides using ...