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'!

Filter by
Sorted by
Tagged with
1
vote
1answer
41 views

How is the Max Target of a Genesis Block Decided?

I've been diving into the world of Blockchain and crypto lately, trying to build my understanding of mining specifically. I understand that in POW systems, the difficulty of the first block is 1, and ...
0
votes
1answer
38 views

Bitcoin was sent to my wallet 7 days ago but it has not reflect in the wallet [duplicate]

I checked the bitcoin explorer to check if the bitcoin is in and Yes it is but it stays unspent but it has not reflect in the wallet of the main address for 7days now ...
1
vote
1answer
55 views

Why don't bitcoin nodes invalidate new blockchains that don't contain all the data of the old blockchain?

If nodes only accepted new valid blockchains that contained all the data of the old blockchain, then miners will still be able to add blocks to the current blockchain because their blockchain will ...
0
votes
1answer
42 views

I can not find a clear mathematical proof method with details and example for “near to zero chance of generating the same pair key wallet”

A mathematical proof method with details for "near to zero chance of generating the same pair key wallet" I can not find a clear mathematical proof for the top sentence with example
0
votes
0answers
11 views

Does the protocol ensure that pair keys wallet are unique? [duplicate]

What mechanism for proof unique pair keys (public key and private key) when creating a wallet with several sources(such as "wallet.btc.com", "wallet.bitcoin.com", "www....
1
vote
0answers
25 views

bitcoin-etl: problems with installing

I am trying to install bitcoin-etl: https://github.com/blockchain-etl/bitcoin-etl to analyze bitcoin blockchain. I have Mac OS and python3, I run this in terminal: pip install bitcoin-etl Also tried ...
1
vote
1answer
49 views

Adroid Blockchain wallet ver 4.0.12 recovery

Just repaired my old Android phone, with Blockchain wallet version 4.0.12. It is asking for either the four digit PIN or the password, which I have both forgotten. Is there any way to recover this now ...
3
votes
1answer
75 views

Why aren't public-private keys sufficient to build a block chain? Why do we need proof of work/stake?

Taking the simple case of Bitcoin here: If all nodes can validate published transactions by checking the signature (created using the private key of the sender) of the transaction against the public ...
1
vote
4answers
98 views

If the computer that stores the bitcoin is destroyed, how does someone access their bitcoin?

I have seen people say that you just need the private key and "some software" to recover your bitcoin. What does this actually mean in the real world? Can someone give an example? Also, if ...
1
vote
2answers
205 views

Blockchain transaction verification

I watched the 3Blue1Brown video about the blockchain and a question arose. How is it ever guaranteed that if I send out a broadcast it will ever be put in a block that gets verified. For example it (...
0
votes
1answer
13 views

Possible To --enable-wallet After Syncronization With Blockahin?

I am running bitcoind from the command line (--without-gui) and my system apparently does not have the correct Berkley DB version (4.8+). Therefore, I chose to run the program without the wallet ...
1
vote
1answer
51 views

Preventing secretly mined chains

In order to prevent attackers from secretly mining chains (which they could later publish to perform double-spending attacks), would it be possible to require some information to be included in the ...
0
votes
0answers
46 views

Sent money from Bitcoin Core to mobile Electrum and for 3 days can`t recieve it

3 days ago I made transaction from my Bitcoin Core to my mobile Electrum but I didn't receive any money yet. I can't see this transaction in Electrum and on Blockain,Tradeblock either, however, ...
1
vote
0answers
15 views

RegTest Genesis Error

how to generate regression test genesis block ? i saw in bitcion nonce is 2. but i generate from GenesisH0 it not showed nonce 2. for other altcoin i saw nonce is 0 why ? how to generate it ? python ...
1
vote
3answers
330 views

How does the blockchain resolve arbitration issues?

I understand that a bitcoin wallet is nothing but a transaction record performed on the block chain. How are transaction details updated in the decentralised block chain? In a centralised system a ...
5
votes
1answer
131 views

What's the advantages of using the block chain as opposed to L2 solutions

I'm looking for a good example and explanation from a software architecture perspective BUT for general audience about the benefits of solving and having blockchain features on Layer 1 not ...
0
votes
1answer
33 views

How to split fee between more than one miners?

I found that some BTC blocks have more than one miners, for instance: https://www.blockchain.com/btc/block/000000000000000049a0914d83df36982c77ac1f65ade6a52bdced2ce312aba9 there are two miners: ['...
4
votes
1answer
440 views

Blocks from before the genesis block

How do we know that there are no blocks that predate the genesis block? A block that could potentially contain any number of coins. If somebody already created such a block from before the genesis but ...
0
votes
0answers
23 views

bitcoin-cli sendmany but not shown explorer

I sent bitcoin to 93 people with sendmany function. It made a tx id = "abc7f3f878fe0fff59bd295ea1a7f86c4a13f1ea8bbd3eb52629f040d06069b4" but I couldn't show in bitcoin explorer. I ran ...
0
votes
1answer
102 views

Can a unconfirmed transaction be lost or modified?

I am beginner and I am still learning fundamentals of block and bitcoin network. Suppose, I do a transaction on bitcoin network, it is marked as unconfirmed transaction and is stored in mempool of ...
0
votes
0answers
11 views

Computation expenses of syncing / getting a full node up and running, hardware considerations

Since a full node needs to process the entire block chain from the beginning and it keeps getting bigger this requires more computing resources over time. Does it seem more likely in the near future ...
0
votes
1answer
57 views

Trying to understand the mempool and how transactions are picked

I am very new to blockchain and try to understand it completely. What I think I understood is, that every transaction is going to the mempool first and these transactions are getting picked by miners. ...
0
votes
0answers
37 views

Final Balance -Balance showing different then Coinspot BTC wallet

Bit of a beginner question I have been using crypto wallets for a few months and have basically learned through trial and error. The question is my BTC wallet on Coinspot has a $0 and 0.0 BTC balance. ...
1
vote
2answers
49 views

What prevent someone to not use the receiver address of one transaction as the sender in another one?

Title may be confusing you, and to be honest I am also confused how things work and I am new to this crypto world so sorry in advance if I am not using the correct words. I try to explain : Let say ...
0
votes
0answers
28 views

Unconfirmed tx with blockchain [duplicate]

It’s been a month now and my tx still is unconfirmed. I know it’s because of my low tx fee. I tried using Viabtc and paid them a fee of $117.00 and nothing happened. I’m still stuck waiting not ...
0
votes
0answers
8 views

Unconfirmed Transaction is stuck from last three days [duplicate]

https://blockstream.info/tx/8504d29348a9bb33e0b4c73538f5dd04464bfe11d45445e55e1524102a656d23 This transaction is stuck from last three days. Need help pls
0
votes
1answer
79 views

Bitcoin cash not syncing the current block [closed]

I have installed BCH "Bitcoin Unlimited Cash Edition bucash1.7.0.0". Problem is the current block is not synced in our wallet server, the server is stuck at block "635258". How to ...
1
vote
1answer
46 views

Does the concept of a blockchain introduce a violation of privacy?

Per my understanding, in a blockchain system, all transactions are recorded on an immutable ledger. Given this, if you know your friend's public address, wouldn't it be possible to figure out the ...
0
votes
0answers
32 views

I cannot locate which bit coin wallet my funds have gone to

I sent bit coin from 2 external accounts to the same bit coin wallet which were completed on the 4th March 2021. My problem is that I do not know which wallets they have gone to. I cannot find these ...
0
votes
1answer
24 views

Classifying Miners based on their Location

Is there any way to classify the bitcoin miners based on their geographical locations? Is there any possibility of doing so for the participants in cooperative mining as well? Thank you
0
votes
0answers
25 views

I can withdraw my BTC on cryptoayo and they insisting on me to pay an amount …?? How can one unlock block chain and be independent and withdraw? [duplicate]

Hello guys ...Im asking how can I withdraw from cryptoayo and there is a block chain that doesn't wanna release my current balance and it's 23,825 been trading on auto trading for six months
0
votes
0answers
35 views

Where did my Bitcoin go? Please help!

Can someone please help me understand what happened here? Did I get hacked? Or is this sitting in an exchange or wallet somewhere that I can’t figure out. Can someone help me figure out what exchange ...
0
votes
1answer
130 views

To be blunt bought bitcoin in 2009 at 25 cents have not touched it

I am hoping you can help I read through a few of you answers to other inquiries and as per my research you are very well versersed. I acquired Bitcoin back when it first came out of trading at 0.0008 ...
0
votes
1answer
49 views

What happens if everyone disconnected from the blockchain

What would happen if for some reason, every computer connected to the blockchain was disconnected, and no peer-to-peer connection was established with the blockchain protocol between 2 users. Would ...
0
votes
0answers
53 views

My Bitcoin was transferred to someone’s address from my blockchain wallet!

Ok I have done research on my situation and this is what I have found. On 1/17/2021 I tried to login to my blockchain wallet and the captcha was glitching. It asked like 10 times! So I sent blockchain ...
0
votes
1answer
27 views

Unable to view coinbase transactions on blockchain.com

I'm trying to view some of the transactions I've made on coinbase on blockchain.com. I copied my btc wallet address from coinbase and searched it on blockchain.com -- nothing showed up. Why is this ...
0
votes
1answer
845 views

transferring funds from bittrex to binance

I want transfer a btc from bittrex to binance but they are telling me that they are supporting only non segwit adress. I don’t know if my btc adress In binance it’s non segwit too. Thank u
0
votes
0answers
20 views

what is math behind elliptic curve? (duplicate) [duplicate]

I have seen many videos regarding the math behind the bitcoin elliptical curve but none of them showing the public key generation they are just defining few steps. i need complete math behind the ...
0
votes
0answers
77 views

Unconfirmed transaction and expired address help

I have one unconfirmed transaction and now the expired address. I cannot abandon the transition because the writing is gray, +24h hours have passed (the arrival was expected in 8 hours...) and no ...
0
votes
0answers
51 views

Bitcoin Address Expired

so I sent bitcoin to an address before it expired but before it could expire it didn't arrive to that address yet, would it still reach that address anyways or is it that when the address expires that ...
0
votes
1answer
36 views

Is there a service that shows up used addresses containing a substring?

Is there a service that searches the blockchain with a string or possibly a regex to find out a set of possible addresses, say if I only know a half of a public address?
0
votes
1answer
41 views

Why doesn't Bitcoin use a DHT to store its blockchain?

Why doesn't Bitcoin store its blockchain in a DHT, but instead makes each (full) node store the entire blockchain? related questions: "Why doesn't Bitcoin use a DHT for choosing peers?" and &...
0
votes
0answers
27 views

Scammed by Bitcoin Recovery Expert [duplicate]

We were initially scammed for 1000.00 through blockchain. So then we did some research online about fraud recovery experts. We came across a site called stallionedge.tech and their clients had rave ...
0
votes
1answer
33 views

Does Bisq somehow use the Bitcoin blockchain for recording trades?

I just noticed that, after accepting a trade to buy BTC for fiat, Bisq says: Deposit transaction has been published. You need to wait for at least one blockchain confirmation before starting the ...
0
votes
0answers
81 views

What are the sources of entropy in blockchain

I have little understanding of what entropy is and its specific role in blockchain. What I understand is that they're sources of randomness. From that, I'm able to infer these sources in blockchain ...
1
vote
1answer
66 views

Is it safest to double check my new bitcoin address never showed up in the Ledger (the blockchain) before?

I just noticed in my Coinbase Pro, I can click deposit, BTC, and get a brand new address every time. It probably is due to "address is very cheap". It can be just a new pair of private key ...
-3
votes
3answers
78 views

Is it possible to get a monthly “fiat/altcoin allowance” from simply “locking” your Bitcoins in a pure smart contract?

Let's suppose that Mr. John Doe has somehow managed to accumulate 10 BTC. He holds on to them for dear life as it's his one and only savings/lifeline. He has essentially zero fiat money. Only a bank ...
0
votes
1answer
41 views

What are the benifits of using Compressed Bitcoin Addresses rather than Uncompressed addresses if same length?

They are both in base58, both 34 characters long, so where exactly is the space saved? When converted to binary is there one less bit on the compressed key as opposed to the uncompressed one? (This is ...
0
votes
0answers
56 views

blockchain parser

Hi everyone, I have the following script for parsing blockchain blocks but it parse one block at a time and output is not printing in a file. whereby I want to use the directory where the blocks are ...
-1
votes
1answer
167 views

is there some one expert with the btc recovery tool?

trying to use btc recovery tool , installed every thing , python 2.7 and all the required pibs . followed tutorials . actually i need to find second password so am using the command i.e c:\python27\...

1
2
3 4 5
53