Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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regain your lost fund

You have lost money in trading binary options, don’t feel bad Contact( recoverysolution22 at tutanota dot com) they just helped me recover my funds $98,000 from binary investment company online the ...
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how does GHOST protocol really work?

I am trying to wrap my head around GHOST protocol... I know it's too much to read, but not my fault. It's GHOST that's complicated (i guess) As I read, it's said that: instead of a longest chain ...
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how does bitcoin's 6 confirmation really help?

I've read the following: transaction is “confirmed” once it is buried 6 blocks into the blockchain. This is taken to be a sufficient proof of work such that reversing 6 blocks to double spend coins ...
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Blockchain wallet showing 0 however app showing balance

So my blockchain desktop wallet is showing 0 balance whoever if o go in to the app i can see my bitcoin wallet balance. When again i click on the wallet it goes back to 0 in the app for some reason. ...
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1answer
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how does node validate scriptSig

Let's say I sent some BTC to Bob, so I created a transaction (forget about scriptPubKey) since let's say I was able to prove it by executing scriptPubKey. so After I sent BTC to BOB, new transaction's ...
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how does bitcoin know which one is utxo? [duplicate]

Let's say John gave 5 BTC to me. So, John took his unspent outputs and put it into inputs to create a transaction. Let's say John already had a transaction which was holding exactly that amount of ...
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List of different unknown mining pools

A miner can identify himself when he receive his coinbase transaction, we can view them on website offering block explorer like https://www.blockchain.com/charts/pools Some of these miners are listed ...
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Can you verify partial blockchain information from a third party, without yourself having an entire blockchain?

I'm considering consuming, or if unavailable, I'm considering providing, a bitcoin blockchain querying service along the lines of json rpc. Would it be possible for me as a consumer of such as service,...
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anyone can help me recovering my bitcoin bip38 password? [duplicate]

i have bitcoin wallet with more than 1 btc but i cant import it without losing this amount cos i forgot the bip38 password public key: 1CZosSHnf87ZqZ3fRiAuikpzdCZhAKsi3y private key: ...
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how and when does block and transaction validations take place?

I have a couple of questions and will try to explain them here. So, let's say we have 4 nodes in the whole network. one of the nodes (node A) took transactions from pool. before they put it into a ...
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1answer
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how to make own coin with soft fork? [closed]

What I am looking to do is soft fork on litecoin and create my own coin! I know that I need to make a node but I can't find any process that shows me how to create my own coin.
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I can't install Python keyutils

I can't install txnutils and keyutils it shows some error like keyutils.h any help how to install this two file on python 3 and also I can't do this Import ecdsa Import hashlib Import txnutils Import ...
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Bitcoin users limit

How bitcoin handle users limit if only 4000 transactions in every 10 minutes ? Let's say I transfer 2 bitcoin to Anuj account then how much time maximum it will take to reflect in Anuj's account and ...
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Tiny 1-block forks in blk.dat files

I just completed parsing the Testnet3 Bitcoin blockchain stored in the blk.dat files into a database. Since I was using multi-processing to parse several files at the same time, I didn't add the ...
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1answer
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Zero Day BlockChain Timezone Exploit

Couple weeks ago, a new Blockchain exploit was found by a hacker named: Zer0dayxploit unfortunately, i am not a tech person, but it seems you can earn abt 500$ a day with this exploit! He wrote a ...
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1answer
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How does block propagation delay not cause accidental forks?

Block propagation delay, it looks like, is about 122 seconds in some cases. If another block is formed before the first block is completed, wouldn't this accidentally create a fork? How would this ...
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How do I withdraw from an address

I made a Crypto purchase from Shapeshift yesterday, which was fulfilled by one of their partners called BANXA. I just received an email saying "Your order has been fulfilled and you will receive ...
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How is data in a blockchain stored? Structure of block and blockchain

I'm trying to build a blockchain-based application and I have a problem with understanding some crucial issues. What exactly is a block? I mean, I've seen application where blocks were just String ...
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How many transactions are there in one block

What I understand: When a transaction is made , miners compete to validate it and create a hash . If one miner creates the hash and more than 51% of miners agree on the validity .Then the a block is ...
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1answer
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How do merkle trees ensure credibility to blockchain, when full node wrongly denies a presence of a txn in a block?

How can Merkle Trees ensure that a full node doesn't lie to a thin node that a txn t is not present in a block B if infact B contains t? How can a thin node tell if the full node is lying if the full ...
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Bitcoin balance vanished when transferring from bitcoin trading wallet to bitcoin wallet balance on blockchain app

I tired to move my full bitcoin balance from my bitcoin trading wallet to my bitcoin wallet balance on the blockchain app, but when I transferred it to my bitcoin wallet balance it never gave me ...
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1answer
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Does cryptocurrency ETF use block-chain technology?

As you know, one of these days trends is cryptocurrency ETFs that the CES doesn't approve it yet. But there are some questions about them and their functioning. Is it necessary to build them over ...
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2answers
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How to count the provably unspendable UTXO in the blockchain?

As far as I understand, one can count the UTXOs by iterating through the blockchain starting at block height 0 and counting the number of outputs and subtracting the number of inputs for each block ...
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1answer
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I sent bitcoin and put low tx fee (4sat/b). Unconfirmed for 3 days. Can it be forever? [duplicate]

I just want to withdraw bitcoin and put a low fee. It's been 3 days and nothing happened with it - Unconfirmed. So, can it be forever? Or how much time it may take to be confirmed? Or what should I do ...
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How do mining pools fetch and retrieve blockchain data? How could one start their own?

I was just wondering how the various cryptocurrency mining pools are fetching the live transaction data, such as merkle trees, block hashes, etc. I am new to mining, but a great programmer, so I had ...
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Automate Bitcoin Sell Transaction within a website

I recently built a web application for a client where users can buy and sell BTC, I have integrated the wallet but am having still trying to figure out the best way to automate the buy orders and sell....
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Is there actually such a thing as “blockchains” being used right now for actual things? [closed]

In the last few years, I've heard "blockchain" and "blockchain 2.0" and many other such buzzwords repeated so many times that I'm beginning to wonder if I've missed out on ...
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1answer
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How come the bitcoin blockchain is only 285gb only?

I found some statistics that the bitcoin blockchain is 285gb. https://www.statista.com/statistics/647523/worldwide-bitcoin-blockchain-size/ Bitcoin has been around for how long? 10 years? with 1mb ...
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3answers
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Is blockchain.com the only place where you can see the blockchain?

I've been investigating Bitcoin and when I would try to find out where the blockchain is stored, I was told that it is stored on everyone's computer. Then I would ask where was the blockchain stored ...
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1answer
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Can you have a cryptocurrency with a single source of truth?

Can you have a cryptocurrency that's based on TRUST? (how dare I use this dirty word haha) Everyone who participates in the system agrees to trust this 1 party only, because they find them trustworthy....
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2answers
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What is the best free iOS wallet out there? [closed]

I only ask this question because there's so many kinds of wallets out there and I understand the difference between wallets(hardware wallets, iOS and Desktop wallets). But what is the best wallet in ...
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1answer
37 views

What would be an example for an insertion into the blockchain?

I'm reading the paper The Bitcoin Backbone Protocol: Analysis and Applications. On page 21, definition 8 reads: An insertion occurs when, given a chain C with two consecutive blocks B and B, a block ...
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Is there a real case where a very long blockchain got overtaken? [duplicate]

The longer the longest blockchain is, the harder it is to get overtaken by new blockchain with different sequence of transactions. But is there a case where it happened? What happened afterwards if ...
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Abandon transaction in Bitcoin Core with -zapwallettxes (transaction isn't online in mempool yet)

EDIT: I have found another solution for my problem. I've started Bitcoin Core with my wallet.dat backup, which I have saved before doing the transaction. If I am right and Bitcoin Core hadn't send the ...
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How's Blockchain like “magical Smart Contract”?

Please keep everything like I'm 5. I don't know computer science or programming. Please help me understand this ELI5 comment? I simplified names. Bob opens a candy shop called BCS (Bob's Candy Shop). ...
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What is the current growth rate of the bitcoin blockchain size month by month in 2020?

I'm looking to get a VPS to host a btc full node and would like to know how much space I should get and what is the current Bitcoin blockchain growth rate on a monthly basis?
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Where is the actual data stored in blockchain?

I know that the blockchain stores the transnational data and it is immutable but where is the actual data stored? If there is a use case to replace a centralized data center solution with a blockchain ...
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Hash160 and Hash key [duplicate]

I can not find a way to get hashkeys. How do I get HASH160, HASH KEYS I have tried several options but no result or way forward.. I know both are wallet related. A friend is building a private ...
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What are the potential causes for the “block not found on disk” error?

We run several bitcoin core nodes and load balance requests across them all. We occasionally hit the error "Block not found on disk" shortly after a new block gets confirmed, when looking up ...
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My unconfirmed BTC transaction on blockchain just disappeared [duplicate]

I had an unconfirmed BTC transaction on blockchain.com for about 2 days plus and now I log in and there's no transaction again. I checked blockchain.info using the hash; all wiped nothing is showing, ...
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Who generates the Bitcoin mathematical puzzles? [duplicate]

I would like to know how it is generated and who generates the mathematical puzzles within bitcoin, and how is its generation mechanics and how it also verifies transactions.
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1answer
81 views

Pending Unconfirmed Transaction for 5 days

I have been waiting on this transaction to confirm since July 16th when I made it. I have no idea as to why this transaction is not being fulfilled. Here is the blockchain of the transaction. https://...
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Why do we need 2F prepare certificates instead of just F+1 in PBFT?

I started reading PBFT and I could not understand: why do we need 2F prepare certificates? The client needs only F + 1 replies, not 2F, so why can't the same rule be applicable in the prepare phase of ...
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2answers
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I received an email that says someone sent me bitcoin

I was sent bitcoin through email, but I am being told to pay a fee first so that I can receive the funds. What should I do and I don't have the fees?
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missing transaction not received

I transfered 0.013 mBTC into Bitoincore.org wallet.on the 07/07/2020. As yet I have not received Hash:- 13290114c5e1fe381c707e5f67b246cd0260f5bd24c9a1fc1aed0eab08dd2521 Address:- ...
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1answer
35 views

Where does “Included in Block” value comes from?

I was exploring transactions inside of a blockchain using this site, and inside of a transaction I noticed there is attribute called Included in Block and its description is: block this transaction ...
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2answers
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Blockchain transaction change output

I'm very new to this. It’s hard to know for sure, but what’s most likely the case with the below transaction: Someone sent 25.99 bitcoin to another person/organization Someone sent 1 bitcoin to ...
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1answer
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Blockchain transaction unspent [duplicate]

This is a bitcoin transaction as shown in a blockchain explorer. What does ‘2 confirmations’ mean here? Sorry for the picture quality. Which one is the best answer? 2 confirmations by miners are ...
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1answer
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how to find the block height from merkle root?

I have the merkle root, using this value, how to get the block hash or its height? There is this merkle root available in getblock RPC output: ./bitcoin-cli getblock ...

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