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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Bitcoin Chainstate Leveldb sst

I'm trying to read the chainstate, and wrote a small Leveldb client to do so. When I run leveldb, it tells me Corruption: 960 missing files; e.g.: /opt/bitcoin/chainstate/890787.sst. Googling shows ...
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A proposal for a genuinely distributed blockchain and pruning

The following idea is so simple that I cannot believe that it is really new. It must have been presented and discussed at length (and rejected) previously, but I submit it nevertheless, for lack of ...
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Can there be a blockchain without mining?

This is a question about Blockchain in general, not about Bitcoin as a currency on top of Blockchain technology. Let's say I want to issue a vote on top of, lets say, multichain. I would issue an ...
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End of Mining intention [duplicate]

If every block generated all 10 Minutes to validate a transaction, and the last bitcoin will generated in 2140. And there is no limitation of blocks.. Whats after 2140, because all miner have no ...
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Requirements of Bitcoin Exchangers [closed]

I have good information on the cost of acquiring a local license and the requirements to obtaining the license. What i don't have access to is the requirements of the bitcoin exchangers. An example, ...
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44 views

How can I find a Bitcoin address from the transaction time and amount?

If I know the time of the transaction down to the minute and the amount of Bitcoin, how can I find the transaction id (or transaction ids, assuming there is more than one)? Is there an online ...
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How to explain a blockchain-based voting system?

The blockchain is used by this plateform to create a voting system. I try to understand by comparing it to the bitcoin blockchain. Could you please point out the similarities and the differencies? ...
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25 views

How can I extract the values of all UTXO for a specific section of the blockchain?

I'm working on some statistics concerning the distribution of the UTXO set. I'm especially interested in the values of the UTXO, and would perhaps like to limit extraction to certain sections of the ...
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36 views

Can the system of votes (of Stack Exchange) be considered as a blockchain?

When discussing with a friend about blockchain, he told me that he read an article about using blockchain in management: people can vote on somebody else's work, so that he can gain reputations points,...
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What is the composition of transaction types in current blocks?

What types of transactions do we see in blocks today and how much of the blockspace do they occupy? I.e. does someone have data how much of the blocks are Pay to PubKey Hash, Pay to PubKey, Pay to ...
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36 views

Data on illicit activities for machine learning

Is there any published data on fraudulent transactions? E.g. has the FBI published a list of blacklisted addresses from the Silk Road controversy? This is in regards to using such data for machine ...
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How a block is defined (size, number of transactions)?

While exploring the Blockchain.info charts, I learned that: The average size of blocks is increasing (max=1MB). The number of transactions in one block is also increasing. After reading some ...
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Can an intermediary block be lost?

Since the blockchain is stored in a distributed database, is it possible that one block can be lost? Then it would be impossible to link future blocks to previous blocks. How many copies of the ...
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Takes longer to download newer blocks?

I have been downloading the blockchain to a new client and it has been at it now for almost a week. One thing I notice is that as it is getting close to the end, it is slowing down a lot. For example,...
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157 views

Since the blockchain is public, how can we see it?

The blockchain is a shared public ledger for Bitcoin. What does that mean exactly? Is it possible to see, publicly, all transactions? For every bitcoin a person owns, is he able to see all the ...
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61 views

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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82 views

Could blockchain technology be used to implement a verifiable voting system? [duplicate]

From an efficiency point of view, voting at elections online seems to make a lot of sense except that there is currently no way to have a completely trustable electronic voting system because of the ...
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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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68 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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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
300 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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128 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
55 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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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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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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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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68 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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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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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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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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37 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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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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128 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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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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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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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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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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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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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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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 ...
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159 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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126 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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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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74 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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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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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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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 ...
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1answer
42 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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91 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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103 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 ...