Questions tagged [blockchain]

The journal of all confirmed Bitcoin transactions. The blockchain consists of a linked sequence of blocks and each block contains a list of transactions.—Please use [blockchain.info] for the eponymous UK-based company.

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What are ALL the consensus rules?

I asked this question before, and it was quickly locked and pointed to a thread about mempool policy... yet my question remains unanswered. Let it be known, I don't want to know what policy is [or is ...
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Is it possible to create a wallet service, which doesn't have all the blockchain downloaded?

Is it possible to create a wallet service, which doesn't have all the blockchain downloaded? Like not running a full node itself?
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List of Bitcoin exchanges available in 2009

hope you can help. I am helping a friend to find their Bitcoin wallet. The wallet is believed to have been created in 2009 and the coins were transferred to a Bitcoin exchange. My question is what ...
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Wrong hashes for blocks when parsing from blk

Hello I'm using a python script to actually retrieve information from a blk file and to read data. import datetime # Read block ! file = open("REDACTED\blocks\\blk00000.dat", 'rb') ...
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How to calculate how a certain transaction impacts a token price? [migrated]

How to Calculate Token Price Impact of Large Trades in Decentralized Finance (DeFi) Environments I am developing a tool to analyze the impact of large trades on token prices within a Decentralized ...
2 votes
4 answers
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What is the meaning of difficulty in Bitcoin mining?

I'm a beginner in Bitcoin and Blockchain technology, so I have a question after reading about the difficulty in Bitcoin mining: What does the difficulty actually mean? I read that A high difficulty ...
6 votes
1 answer
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Where does the 2-hour limit on the timestamp come from?

Bitcoin wiki says that: A timestamp is accepted as valid if it is greater than the median timestamp of previous 11 blocks, and less than the network-adjusted time + 2 hours My question is why 2 ...
71 votes
2 answers
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Can someone explain how the Bitcoin Blockchain works?

I'm trying to figure out how the blockchain works and how to read it via blockchain.info website. Is there a laymen way of explaining how the block chain works and how to read the blockchain to trace ...
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1 answer
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bitcoin block time analysis with conjuction to propagation

For both scenarios that I will describe below, assume the 2 things. that network propagation for blocks always 6 seconds. that we start looking at my analysis from time = t0 and at that t0, every ...
2 votes
2 answers
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How do you verify a block manually?

From my understanding, you simply need to use a SHA256 function to hash the block's header (Block hash and merkle root) then add the nonce at the end like this article explains. However, I can't ...
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I Get "Non-canonical DER signature" Error

it was asked few times in BSE and they were pointing the problem to the sighash which was not appended to the transaction but i did it and still have problem. i had a problem with amount of fee and ...
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Is It normal for a transaction fee to be 235% higher than the amount being sent?

I had 2 transactions for the same amount of 0.0021 btc sent out to two different btc addresses and the transaction fees were 0.0048 btc for each of the transactions. Is this normal? Is there any way ...
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Tracing Blockchain.com Wallet-ID from Receiver Address. Address Re-use

I am wanted to question related to blockchain.com ? If i have some one BTC to BTC receiver address can i trace name or wallet id or something? For example if i generate multiple btc to btc receiver ...
2 votes
1 answer
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How does solving a block work in relation to the first letter/number after the 0's?

I did a terrible job of explaining it in the title so I'll explain here. Say the target hash to solve for a block is 00004aef... etc. does that mean that you can't solve the block if you get 00005fad (...
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2 answers
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How do I find out who sent me Bitcoin?

I'm working on creating a service where it will accept Bitcoins from a certain address and be able to manage the Bitcoin for that user. I'm using Coinbase APIs and I can't find a simple way to find ...
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1 answer
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What happened to this Bitcoin transaction? Block fee lost?

I'm writing a bitcoin blockchain indexer. I've indexed every block hash and now I'm working on indexing each transaction in each block. I've been finding some weird stuff here and there and I don't ...
2 votes
1 answer
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Different balances in API block explorers for BTC

BTC.com block explorer shows bigger balance than for example Insight or Blockchair. For example: https://btc.com/1FLDCfr9iG7n6bAdGsqBXmhaLgC4aSze72 https://insight.bitpay.com/address/...
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What happens if all transactions are being used?

I know that there are an upper limit to the number of hashes that can be mined. But I do not know why is this a case? I guess it is due to the enormous amount of computation necessary to find hashes. ...
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bad data structure cause "Signature must be zero for failed CHECK(MULTI)SIG operation"

i could not fix the problem using available answer for this error on BSE. this is my previous transaction. i test alot of different data structure which was said to be the correct one but i got ...
2 votes
1 answer
388 views

Blockchain receive payments API Network propagation

I'm using the Blockchain API to generate an address to receive payments. I received a payment to a generated address, then Blockchain sends the received amount to the address I defined but that ...
2 votes
2 answers
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What are bitcoin Pool APIs?

I contacted a website and asked them where they get their data for crypto like Bitcoin, as I am trying to find the place for the most up to date and reliable data on Bitcoin and other crypto. They had ...
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1 answer
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BlockChain.Com Wallet - Why transaction FEE Is very HIGH

I have two wallets in BlockChain.Com web site. When i want to transfer bitcoin from one of them situation is like this : Money for transfer : $1000 Transaction Fee = Priority = $26 In another wallet ...
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1 answer
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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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Is it possible/feasible for nodes to redact information (for example inappropriate images) in their blockchain and remain part of the network?

With the freedom to run nodes being critical to bitcoin's success, I'm concerned that if someone successfully writes highly inappropriate or abhorrent information/images as a valid transaction then ...
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Are extra fees required? [duplicate]

Do you have to send extra money for blockchain / gas fees before they will process a transaction?
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1 answer
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Can I recover missed phrase on p2sh wallet?

I have a wallet from past with p2sh format, also I know my private key but I just lost 4 character of that, I tried few apps to recover that but no one works(they work on another wallets prefectly), I ...
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1 answer
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Blockchain endpoint working

I wanna clear this thing that how blocks are retrieved and created in from the nodes using an end point. The end point is basically centralized and have nothing to do with network if i'm not wrong. Is ...
2 votes
2 answers
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Is bitcoin just one long block chain or are there multiple chains?

Is each block found just a link in the same long chain, or are there multiple chains?
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How are NFTs stored in the bitcoin blockchain? [duplicate]

I'm new to bitcoin and am looking into how NFTs are stored into the blockchain. I saw somewhere that Taproot Script-Path Spend Scripts is where NFT data is stored but I'm not sure how. Can someone ...
1 vote
1 answer
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What to look for in Bitcoin-core logfile when something bad happens

About a week ago I was trying to reorganise my file structure with Bitcoin Core, I accidentally moved the file before listing it as a backup so when I opened Core, it didn't work. I tried returning ...
3 votes
2 answers
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Understanding how ordinals work with the Bitcoin blockchain. What is exactly stored on the blockchain?

Supposedly someone uploaded a Doom clone to the bitcoin blockchain: https://ordinals.com/content/521f8eccffa4c41a3a7728dd012ea5a4a02feed81f41159231251ecf1e5c79dai0 But I'm a bit confused on exactly ...
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1 answer
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Create wallet address on user registration for trading platform

I am creating a crypto-trading platform . I wanted to know how to create wallet address dynamically for all new registered user and also create new address for every transaction. I am using bitcoind ...
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1 answer
617 views

i need help getting my bitcoin back from an address [closed]

i sent my bitcoin to another address i generated from another site not knowing they have a policy that if the bitcoin is not up to 0.005 it wont be able to reflect. now my question is that would my ...
2 votes
1 answer
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How much on-chain activity is to and from exchanges?

Are there any data services which provide metrics that show how much of the transactions on the Bitcoin blockchain are to and from exchanges?
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Which part of bitcoin is sitting or moving

With Bitcoin ETFs on the horizon I expect that I am not the only person hoping to gain deeper understanding of the way bitcoin moves. I wonder if there is any insight in which part of the bitcoins ...
25 votes
1 answer
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How does Bitcoin read from/write to LevelDB

I know that Bitcoin Core uses LevelDB since 0.8 version. However, I couldn't find detailed explanation about how Bitcoin stores and retrieves from LevelDB. E.g. If B transaction uses an output from ...
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How to create own crypto currency like bitcoin? [closed]

I would like to create a crypto currency like bit coin. So is there any step by step guide or procedure that will help me to create ones? It would be appreciated if you provide me that.
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1 answer
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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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1 answer
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Hello, I want to know if they use blockchain and if I have to pay any transaction fees

yesterday I made a bitcoin transaction and they did not receive the full money and I was checking what it could have been and I think it was the blockchain and I have several doubts about that, can ...
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How to differentiate between BTC transactions and BRC20 transactions on a blockchain?

How to differentiate between BTC transactions and BRC20 transactions on a blockchain using the RCP interface? This is a transaction record that contains BRC20 tokens which I found on a blockchain ...
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2 answers
1k views

What do we mean by honest nodes?

In his recent paper, Vitalik often mentions the term "honest nodes". What do we mean by that exactly?
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Why doesn't each node store only a portion of the blockchain?

Why doesn't each node only store a portion of the blokchain instead of the entire blockchain? Is it possible and why is it possible or impossible?
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It only takes 20,000 computers to alter the Bitcoin blockchain?

Google says As of now, there are roughly 12,130 public nodes running on the Bitcoin network. So in a nearby small city, there are 70,000 people. If 1 household is assumed to have 3 people on average,...
1 vote
1 answer
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How transactions or wallet balance are retrieved from bitcoin blockchain?

Using different blockchain explorers one can retrieve the wallet balance or transactions of address. My question is how does this query works do they search the whole blockchain for the related ...
7 votes
2 answers
1k views

What is the Block 1,983,702 Problem?

The issue, transition to requiring block height in block coinbases, was discussed back in 2012, however I just stumbled upon it, and would like to understand more about its significance.
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Is it real BTC or fake [duplicate]

All, I received some BTC to my coinbase wallet after someone asked me to setup custom network using the below setting. I received the BTC but I couldn't transfer to any other wallet and the says ...
1 vote
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At what point in time is this "sendcmpct" message sent

In Bitcoin Core, when setting a node to either high-bandwidth mode or low-bandwidth mode, a "sendcmpct" message is sent. At what point in time is this "sendcmpct" message sent? Is ...
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In Bitcoin Core, how do nodes transmit blocks, either in parallel or in series? [duplicate]

In Bitcoin Core, do nodes transmit blocks sequentially to adjacent nodes, or is it a parallel transmission where blocks are sent to multiple nodes simultaneously? Additionally, could you provide ...
3 votes
2 answers
264 views

How much data does it take to prove a given transaction exists on the blockchain?

As I understand the SVP protocol, a client can be reasonably certain that a transaction has been accepted on the blockchain if they know it is a member of a certain block, via the Merkle path, and a ...
4 votes
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In Bitcoin Core, are blocks sent in parallel or in series?

Are blocks sent in parallel or in series? I would also like to know about the implementation part of Bitcoin Core.

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