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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What is the best way to share the blockchain and get it verified by the wallet?

I am the owner of BlockchainDownload and am looking for a way to get some trust in the website. I have shared the link in a couple of topics an get the response "Please do not suggest that people ...
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48 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 ...
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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 ...
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2answers
57 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?
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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 , ...
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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/...
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1answer
266 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. ...
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2answers
97 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 ...
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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....
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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 ...
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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.
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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 ...
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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 ...
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2answers
37 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 ...
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1answer
45 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 ...
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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 ...
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31 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 ...
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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: ...
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73 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 ?
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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 ?
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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....
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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?
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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?
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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 ...
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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 ...
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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
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2answers
136 views

At which point do blocks get validated in the mining process?

I'm trying to understand how mining works and I'm stuck on the part about validating blocks and adding them to the blockchain. When a miner finds a solution to a block, he shares it with the network,...
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1answer
116 views

Does ethereum run on the bitcoin blockchain?

If not, what is the relationship, if any, between Ethereum and Bitcoin and/or the Bitcoin blockchain?
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1answer
45 views

How does a node compare two blockchains?

Let's say an attacker connects to the Bitcoin network. Let's say this attacker possesses an old ASIC HW and she used it to generate a blockchain of half a million blocks, with faked timestamps and ...
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1answer
66 views

Why do websites such as satoshimines and bustabit generate new addresses every time?

Why a single address for each user not enough? Can't they just verify the incoming transactions? If I want to mimic this practice, how can I generate unlimited addresses, from which transactions can ...
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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 ...
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3answers
58 views

A Wallet for many blockchains (not just the bitcoin blockchain)

In terms of the future of the trust network where there will be an increasing number of fit-for-purpose blockchains such as ones for proof of asset, proof of identity, proof of ownership etc., will ...
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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 ...
4
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1answer
34 views

Can you search a transaction by quantity?

I have been looking and I cant figure out a way to find a recent transaction by quantity. Let's say I know someone sent "x" amount of BTC but I don't know who was the sender nor the receiver, this ...
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2answers
60 views

hash versus hash pointer

I am doing coursera online course on Bitcoin and Cryptocurrency Technologies. It defines the concept of hash pointer in the first lecture as pointer to where some information is store and ...
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2answers
98 views

Double Spending before confirmation [duplicate]

What's to prevent someone from using bitcoin at a store like subway and double spending to buy the sandwich before a confirmation is made? Since subway obviously isn't going to wait for a ...
2
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1answer
56 views

How to check if my node is fully sync'ed

Using bitcoin-cli, how do I check how sync'ed my full node is?
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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
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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 ...
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3answers
69 views

How to store transactional information on the blockchain

I have an operational process that involves several sub processes. I am currently maintaining an audit trail of the entire process. For (successfully) completed processes, I want to record the ...
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1answer
76 views

Why the total number of bitcoin is limited? [duplicate]

Why the total number of bitcoin is limited? Is there a protocol in the block or somewhere so that the participants can't violate the rule? The first one who find the block can receive the bitcoin for ...
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1answer
52 views

Double Spend Attack [duplicate]

What's to prevent someone from sending bitcoins back to themselves using the same transaction id before any confirmations? So if I go into a deli and pay with Bitcoin and send those bitcoins back to ...
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0answers
56 views

Which language should be used for developing new Coin Source code?

I'm new to bit coin system. And I need to List my new Coin in C-CEX exchange and the Exchange asked to provide the Source code. And if need to develop the source code, which language is suitable for ...
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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 ...
4
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1answer
107 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 ...
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2answers
80 views

How does each miner know when to create a block?

I have been trying to understand the protocol and reading related documents, there is a point where i get stuck. As far as i understand (correct me if not), when a transaction occurs, it is ...
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1answer
76 views

Restrict the Bitcoin usage only during a particular period

I would like to know if its possible to use a Bitcoin at present in the following scenario. When I send a Bitcoin to an another user,I set certain parameters on the Bitcoin, like it can only be used ...
9
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1answer
142 views

Legal status of Blockchain proof-of-existence TX (USA court)

Is there any real USA court cases with Bitcoin's Blockchain used as an proof-of-existence/timestamp service (without BTC transfer)? Can Bitcoin's Blockchain be used as a 'signing' utility same as ...
1
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4answers
140 views

I want to start mining new blockchain (exactly as Satoshi did in 2009) for testing purpose

I will mine myself ONLY so difficulty will be always in 1 range so CPU is enough for this task So my question is: how to setup bitcoin core 0.12 to start mining with CPU new blockchain ? If I type ...
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3answers
93 views

Who decides that the new block is ready to hash?

I know that new blocks are relayed one block per 10 minutes but that time is not exact but average so: Who decides that the new block is ready to hash?