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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How to find Z value of multisig transaction?

for example this transaction: http://2coin.org/txinfo.aspx?txid=6c3dc603da32bba3f56f2b33053aaf0f0f17322386c0c6846786bffe49f6ef22&cur=BTC Script not of right size to be a scriptSig, expecting 2 ...
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3answers
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What is the fastest way to research Bitcoin block chain?

I would like to do some research of the Bitcoin blockchain. Because i would like to do massive amounts of processing and lookups, I need a fast way to search the blockchain. Http requests to insight....
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Problem with using blockchain for E-Shopping

I have a confusion with blockchain concepts. Blockchain is immutable. So we can have problems in using blockchain for shopping websites. Because if we use it for retail, people have a habit to return ...
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2answers
121 views

How to find Reused R values

I use software from https://github.com/ca333/rng-scanner , I try to find r that is reused. from the software I found results Bitcoin Address : 1GQdrgqAbkeEPUef1UpiTc4X1mUHMcyuGW In Input NR : 141 ~ ...
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How to find the threshold of hash inequality at a given time?

For a miner to mine in bitcoin, he should find a nonce s.t the hash of block <= threshold. At a given time lets assume the total hash rate of the network be A hashes/sec and the mining rate be f ...
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What is the probability of mining a block by a miner controlling a fraction of hashing power?

Suppose a miner controls α fraction of the hashing power and the chain on which he is trying to mine has the mining rate given by f. How to find the probability of mining a block by the miner?
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Why do we often see 2 blocks mined within a few seconds of each other?

This seems to happen far more frequently than one would expect from a Poisson distribution with a ~10 minute mean. Am I just bad at statistics or is something else going on?
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Online BTC wallet implemention with bitcoin-core

I have written a php code to register users and create wallet for them on bitcoin-core full node.My question is how can i manage users wallets.if i use loadwallet to load USER A wallet and get address ...
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2answers
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Wallet forensic

Someone who scammed me used this wallet to receive the BTC 12fmomENb5SSxR54Bitua71CZrc4oVQtmB he hasn't moved them from there since July 31st I'm trying to figure it if that wallet belong to any ...
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1answer
30 views

Rewriting the blockchain?

The main bitcoin blockchain (the chain that miners choose to work on) is the chain with the most proof of work ("heaviest" chain). Currently, the cumulative proof of work on the bitcoin main ...
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bitcoin block time after halving?

I would like to know why the bitcoin block time is taking longer than 10 minutes, I know that bitcoin halving had decrease reward and increase difficulty but according what I read the blockchain ...
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1answer
37 views

Unable to make custom Bitcoin command

I'm writing a thesis on Bitcoin system and as a part of my assignment i have to explore Bitcoin-core source code. I 've downloaded the code, compiled it and manage to run it. However, I wanted to ...
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42 views

Why am I receiving an email from Blockchain about receiving a payment?

I do not own bitcoin and do not belong to Blockchain but received an email from Blockchain about receiving payment... Incoming Payment You just received 3.86655869 BTC from an external Bitcoin ...
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2answers
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Can an unsynchronized node create a valid transaction?

I'm trying to understand how bitcoin transactions work. From what I understand, in the Bitcoin network nodes hold different versions of the Blockchain and after some time the different chains start ...
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1answer
40 views

Replace-by-fee issue

Ok so i recieved a 50$ transaction and it was on my account ( the bottom transaction) and 2 days later i have 0 $ on account and all funds from that transaction apparently got replaced by fee, am i ...
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2answers
58 views

How does the mathematical problem get harder for bitcoin mining over time?

How does it become harder for miners to extract bitcoin as time passes (excluding increasing computer capabilities and the competition between miners accordingly)? Is related to the amount of bitcoins ...
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btc address specific tracking [closed]

how can I track more thoroughly the bitcoin addresses, i.e. I know blockchain and browsers, but I would like to know some system/program that helps me to know all the details of the bitcoin ...
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Corrupt block database

I activated the core with bitcoin-qt as I always do. What can be the cause of the database loss? Synchronization is restarted from the genesis block. I use the testnet with Pruned mode activated.
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1answer
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I made a payment of bitcoin into escrow for services that were not deivered and bitcoin not returned

I made a payment of bitcoin into escrow for services that were not delivered. I requested the funds be returned and they have been removed from escrow, but never returned to me. Can i do anything to ...
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Problems Setting a Transaction Fee on a Per Transaction Basis Bitcoind

I've spent hours and hours trying to find a solution to this problem, with no success. Using Bitcoin Core on a Linux machine, so using bitcoin-cli to process commands back to the daemon. Here's what ...
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2answers
750 views

What is the size of different Bitcoin transaction types?

I found this interesting take on Bitcoin transaction type trends from 2015. As that article is from 2 years ago, I am wondering: a. Are there any newer transaction types? b. What is the average ...
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1answer
92 views

json-rpc of bitcoin not working for testnet(curl command)

I am trying this command to get transaction from bitcoin testnet: curl --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "gettransaction", "params": ["txId"] }' -H 'content-type: text/...
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2answers
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possible victim of non-spendable scam

A bitcoin trader opened a blockchain wallet for me and then sent me my profit but it is non-spendable. I know they can no longer get into my account because I changed the password and I have two-step ...
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2answers
103 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 ...
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1answer
71 views

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 ...
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1answer
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Hash rate, transaction and block relationship

I'm aware that when the hash of the block header (block hash) is below the difficulty target, a block is deemed as validated. But because I've never run a bitcoin node before (will soon), I had a ...
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1answer
30 views

How does a miner identify himself

There has been a new mining pool appearing after the halving called Lubian.com cf https://www.cryptoglobe.com/latest/2020/05/new-bitcoin-mining-pool-comes-out-of-nowhere-already-5th-largest/ How does ...
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0answers
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Stuck unconfirmed balance in multibitHD (stuck since 2015)

I recently started reusing bitcoin. Let's just say, I gave it a lay off when the value of bitcoin bombed in 2015. I sent my bitcoins from my MultiBit wallet to MultiBitHD on 13th november 2015. They ...
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1answer
35 views

Is there any method to extract transactions for an bitcoin address which is not in my wallet using bitcoin core?

I have setup Bitcoin core and trying build an API to fetch all transactions under an address ( not in my wallet ). Bitcoin core RPC documention says that an address which is not in my wallet needs to ...
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1answer
26 views

How can there exist businesses that “specialize in blockchain analysis looking for patterns of usage that reveal how money is being used”?

I read this today in a SE comment for an unrelated question: there are businesses that specialize in blockchain analysis looking for patterns of usage that reveal how money is being used. To me, ...
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3answers
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What are the keys used in the blockchain levelDB (ie what are the key:value pairs)?

I am wondering if I can use node.js and levelup to access a copy of the blockchain database directly. But from what I can see, I need to know the name of the key(s) before I can get any data, as this ...
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3answers
168 views

Even though Blockchain is tagged as “ Decentralized”, wouldn't the organization actually implementing the Blockchain like Ethereum control it?

For example, If I were a business that would want to use the Ethereum Blockchain technology to shift my business to Blockchain, wouldn't Ethereum be in control of the actual underlying Blockchain ...
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How Bitcoin avoids double spending?

If someone is sending bitcoin with low transaction fees and then sends the same bitcoin with higher transaction fees before the previous one is confirmed, so it is obvious that miners will pick the ...
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2answers
171 views

API for multiple blockchains

Is there an API to get data for multiple blockchains? Most blockchain explorers already offer an API but I'd like to be able to get information for different blockchains through the same API.
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2answers
20 views

Problem with data redundancy in block chain

Since the copy of same data is storedon each node in network. Does it use storage space to store same data on each node? If yes then how the data is decentralised. It is just a large network of ...
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1answer
38 views

Can can I identify my deposits to a wallet on a BTC (or LTC) blockchain (using the blockcypher api)

I'm trying to reconcile my deposits to a wallet (happens to be LTC) on an exchange account with the data on the blockchain. I was using the logic: if tx_input_n is -1 then transaction is a ...
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2answers
225 views

Why raw Bitcoin transaction are in hex format?

Why are Bitcoin raw transactions in hexadecimal format? I am looking for scientific articles / books on this topic and I can't find anything, so my question is: why are they in hexadecimal and can ...
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1answer
348 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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0answers
22 views

How bitcoin treats double spending

I wanted to ask regarding transaction malleability that if transaction malleability is going to be done then it will affect another transaction because hash of the previous block would be changed ...
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2answers
378 views

Sending BTC using Seed Hex or mnemonic

I’m interested in sending BTC from wallet to another and probably automate it through some libraries. I have a question: if I have a seed hex or 12 words I can generate all my wallets (addresses, ...
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1answer
19 views

Api to automatically check the status of a BTC transaction

My team is working for a community of members who make donations in BTC to support a cause from time to time. The donations the details are stored in a database and displayed on their personal ...
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0answers
21 views

How to calculate z and z1 from ecdsa signature [duplicate]

Can anyone explain me any clearly answer or code in python with examples how we can calculate z and z' value fromECDSA Signature order? I search in google and youtube and i not saw any correctly ...
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0answers
34 views

How can i calculate z and z1 from ecdsa signature

Can anyone explain me any clearly answer or code in python with examples how we can calculate z and z' value fromECDSA Signature order? I search in google and youtube and i not saw any correctly ...
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4answers
501 views

Where is the data stored in Bitcoin?

Is all the data related with the transaction of bitcoin stored in blockchain or the data stored somewhere in the cloud and they are referenced from blockchain. I have this confusion because if we are ...
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0answers
19 views

What is being done to avoid 51% consensus attack given 80%+ of miners are Chinese and that government could centralize all mining operations? [duplicate]

What is being done to avoid 51% consensus attack given 80%+ of miners are Chinese and that government could centralize all mining operations? / Can the consensus % be incremented to a higher more ...
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1answer
40 views

How does the network verify previous transactions when transferring BTC between two users?

When transferring BTC between two users, the new transaction will consist of references to previous transactions. For example, if I user A wishes to transfer 1 BTC to user B, he will need 'n' ...
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2answers
40 views

Trying to locate my bitcoins

I was working with a broker, now my "bitcoins" are in "blockchain", and I have no trace. How do I find them? How do I find said blockchain and bitcoins ?
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37 views

How to determine if BTC has been received from a particular address

I have been wondering if there is an api available that can enable me know if a certain amount of Bitcoin has been received from a particular wallet address. For the moment I have only be ...
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1answer
62 views

Funds disapprearance [duplicate]

I stored 0.0154 BTC in my blockchain for mining purposes and next morning I found my balance to be 000, what does that mean? Are my coins lost or stored somewhere else?
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0answers
39 views

BTC Miner, trust? or scam? [duplicate]

trust to miner who after the investment ask You other btc to have free access to unspendable-btc in the wallet? any suggestion?

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