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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 is the fault tolerance measured?

“If the number of nodes that agree exceeds 2/3, the blocks or transactions of clients will be accepted” Practical Byzantine fault tolerance (pBFT) : (n - 1) / 3 I read those 2 things in a PDF that a ...
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Whats the difference in way you installing full nodes

I'm newbie in blockchain world, so I'm curious what is the difference between installing full node by using libs such as bitcore-lib (using node.js) and installing it through the daemon (mentioned ...
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Can the Bitcoin network boycott a misbehaving miner?

If a miner misbehaves, can other miners “boycott” him/her by refusing to build on top of his/her blocks in the future? Will such a “boycott” keep the miners from behaving badly?
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How can block time and block size be fixed when transaction volume is constantly increasing?

As I understand it the network rejects blocks over 1MB, and block hash difficulty is set after each block is created as to keep the block time close to 10min. But if people are constantly joining ...
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what happens if a miner include a transaction already exists in another block?

Suppose that I have a Transaction A. (txA) I send my txA to bitcoin network and full node validate it and put in Mempool and starts to broadcasting it. A Miner A connect to a fullnode to create a ...
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Recovery of lost bitcoin

i have my wallet id and bitcoin address in a safe but deleted from all electronic gadgets. So how do i recover my bitcoin by using these said method please advise.
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1answer
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Is this a genuine bitcoin minning app? [closed]

Please can someone explain if this is a genuine app for bitcoin mining?
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2answers
42 views

Is there anything preventing Lightning Network from passing embedded data in OP_RETURN?

As long as you pay a BTC fee for all the routing node incentives and the last layer in the onion routing includes a transaction with OP_RETURN, wouldn't that allow using OP_RETURN for various ...
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1answer
64 views

Homework problem on Blockchain and Merkle trees

This is a question from a stanford course(http://cs251crypto.stanford.edu/18au-cs251/hw/hw1.pdf). I think that Alice needs to send all the k blocks (containing the transactions) to Bob so that Bob ...
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1answer
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How can i look into the Blockchain

I have read that the blockchain is a public ledger with all transactions of a decentralized community, furthermore i read that everyone can check that ledger for transactions that happened within the ...
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Private Blockchains: Blocks’ validation

I’m a software developer and I’m trying to understand blockchain at a code level I have the following issue: There’s a private blockchain, this private blockchain does not have any relation to ...
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1answer
23 views

Private Blockchains: Validation

I'm a software developer, and I have some questions about private blockchains, I'd like to have technical answers since I'm trying to understand blockchain at a code level. I'm going to write a ...
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1answer
33 views

How does a node decide whether a block is valid?

I'm a software developer, and I've been trying to figure out how a node decides whether a block is valid, I do understand the hashes in bitcoin, the merkle root, and all those aspects but my question ...
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Private key of a specific bitcoin address [duplicate]

I need to find out the private key of a specific bitcoin address '1FVoAyGnHueH1uNR4dAQgRZcsBkAd3Mo3K'. This is the bitcoin address of a scammer who made me lose my last savings in the name of ...
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1answer
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Is there any “permissionless” blockchain “without a native coin”?

We may certainly say that a "permissioned" blockchain cannot have a native coin (or cryptocurreny) since in permissioned blockchain we need a permission to be eligible to participate for transactions ...
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1answer
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Reset or backup from a blockchain possible? [closed]

i have a coin for my own interests. With this i will learn how works all. So i have install the daemon on a vps All works fine. Mining works. And the first 300 blocks i have created. Now i will ...
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2answers
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wondering How to use Bitcoin Parser?

I'm a freshman of bitcoin system and I'm trying to find out how to use bitcoin parser. I downloaded several from internet but they were not work out. Currently I am using Bitcoin Knots wallet and ...
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0answers
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Proof-of-Stake: How to ensure immutability of the blockchain?

In Proof-of-Work, a miner tries to solve PoW puzzle based on the hash of previous block, such that in case of changing block B_i, all blocks after that (blocks B_i+1, B_i+2, ...) are no longer valid ...
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33 views

Some general questions about blockchain consistency

I basically understand the principles of a blockchain, nodes and miners. I also basically understand how transactions are hashed/calculated to be added to the chain but i doesnt understand the ...
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Why do people call changed digits in the blockchain a coin or money? How can changed digits constitute an actual item? [duplicate]

The same as all other cryptocurrencies, Bitcoin is just a fancy name for changed digits in a publicly distributed database called the blockchain. It is obvious that NOTHING can appear or disappear by ...
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1answer
24 views

Is there any way to find out latest bitcoin transaction of a particular address in bit-cli, without knowing the txid?

I would like to find out the immediate last transaction of addressA. But so far, I can only do this, bit-li gettransaction <txid> then bit-cli decoderawtransaction <hex> But I want to do ...
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2answers
69 views

Bitcoin-core how to get all transactions hashes?

Please, can anyone help me how to get all transactions hashes? How to browse all the transactions hashes used in blockchain? P.S. How simply get a list of all transactions IDs (as a simple text list) ...
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1answer
33 views

Can I send BTC from other node or wallet with my address?

I'm trying to send bitcoins from node2 with my address using private key noted that my address is created in node1.I followed this link: "https://en.bitcoin.it/wiki/How_to_import_private_keys" I dump ...
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Are there any other balance management systems other than UTXOs and Account Based used by blockchains today?

To know how much balance a user has on the bitcoin blockchain you just need to look at their UTXOs. To do the same in Ethereum you just look at their accounts. Are there any other systems used by ...
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1answer
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Lightning Network: Is it creating 3 transactions instead of 2?

I'm watching this Lightning Network presentation by the original authors. At 9 minutes in, he notes that all the network sees will be a transaction to the multisig address and then a transaction to ...
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2answers
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Where off-chain transactions are registered afterwards?

Reading the questions and answers on this StackExchange, i've learned that into Exchanges there's no transactions over public blockchains being performed, the funds are exchanged among accounts into ...
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1answer
37 views

Getting individual block by height from Bitcoin P2P network

Is it possible to request an individual block from the bitcoin network, using the block height as parameter? Or would one have to start a node and wait until all blocks up to the desired height have ...
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Proof for “Is an immutable, decentralized blockchain possible without economical incentives?”

Bitcoin is immutable because of economical incentives. Those who are able to 51% the network can't do it, because it'll result in the value of the currency to drop tremendously, which causes waste of ...
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1answer
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Bitcoin-qt is trying toload to C drive instead of my D drive [duplicate]

So I'm running a 250 GB SSHD for my windows boot drive and basic system functions. I am running a 1 TB standard HD for my larger files (like the bitcoin ledger). How do I prevent Bitcoin-qt from ...
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2answers
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What exactly makes altering of data in non-bitcoin blocks hard?

If leading zeros is only bitcoin requirement, then what makes altering of data in blocks hard? Like now its easy to modify a block and generate new hash for every subsequent blocks since generating ...
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1answer
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How and where to pay in bitcoins into online wallet if I have address and ID

I just found my "old" wallet.dat. Is it possible to "send" it to an online-wallet in order to avoid downloading the whole blockchain again? Or can I do it directly because I have the Address and ID of ...
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0answers
37 views

Can I transfer it from the wallet file of blockchain.com?

Can I transfer it from the wallet file of blockchain.com? Since trouble continues at blockchain.com, I want to transfer it to bitcoincore.
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2answers
48 views

How do different blockchains communicate?

I've learned that the different cryptocurrencies have their own P2P blockchain networks. How do exchanges convert coins from one network into a coin on another network?
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How does work the next block election in blockchain? [duplicate]

In the mining process each miner will create a block with the transactions found in the pool and will start the calculation of nonce, the miner with greater hash power will finish the job first and ...
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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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1answer
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Non-spend Blockchain.com [closed]

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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1answer
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Extract sender ID and recipient ID of a bitcoin transaction [duplicate]

I'm new to this world and I'm trying to learn the blockchain world and especially now I've concentrated du bitcoin-core, I would like to parser and get the various information like the various sites ...
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In the event of pending computer crash that might corrupt my Bitcoin Core blockchain download. What files can I copy to prevent corruption?

I run Bitcoin core on my windows 10 machine. And occasionally the damn thing shuts off all my applications and corrupts my Bitcoin Core blockchain download. Yes, I know, don't use windows. That's the ...
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2answers
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What happens to the transactions included in the forks?

Let: a) the vector triplet <x,y,z> refer <height, index, parent_index> b) blocks, block100, block110 (of height 1) are mined together and they both refer previous block block00[null] (of ...
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What is the counterpart of mining when using blockchain for traceability?

Our project is to create a blockchain so that a customer can traceback any registered good (such as food or drugs). The idea is to replace money with product IDs. (ERC721 from Ethereum does not do the ...
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A node can publish any block at any time. How? How to publish?

Can anyone tell me what to do to publish if I mined a block
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How do I move the blockchain file location on windowns?

I tried to edit the storage information on bitcoin.info but neither the windowns 7 nor the Bitcoin qt could do it (it says that the app can't open the configuration file). So I tried to edit in the ...
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2answers
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Blockchain and ISO/OSI

I've heard blockchain is built on top of the ISO/OSI stack. Does it means blockchain belongs to the layer 7 (Application layer) of the Osi architecture?
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1answer
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Blcokchain corrupt ledger

What happen to the node if we find that node on blockchain has corrupt ledger? Is the ledger sync with other ledger or get discard.
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How to see download sync speed when syncing the Bitcoin 0.17.1 Blockchain on Ubuntu 18?

I'm syncing the bitcoin 0.17.1 blockchain from the beginning on Ubuntu 18 using Bitcoin Core Qt gui client. Is there a way to see the download speed of the Bitcoin Blockchain and how much time I have ...
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After downloading the entire Bitcoiin blockchain from a torrent, what are my next steps to link it to Bitcoin Core 0.17.1?

I downloaded the entire bitcoiin blockchain into my external mounted drive as seen below and named the directory bcore. I then did a symlink to that folder like this in my home folder (~) location : ...
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1answer
54 views

How does bitcoin broadcast information?

On Bitcoin's Blockchain, how is information transmitted instantly to all other nodes and do nodes 'talk to each other' through an API? Do Blockchain nodes communicate with each other through HTTP ...
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1answer
52 views

Search for BTC transactions by amount range

It is possible to search transactions by amount range using blockchain or other website without having hash, just by range or exact amount?
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1answer
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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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1answer
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Can't use bitcoin-cli commands, error message says “could not connect” from localhost

I am simply trying to run bitcoin-cli getinfo on the same machine that my bitcoin node is running on (with bitcoind -daemon) my bitcoin.conf file is as follows: server='1' rpcuser='username' ...