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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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api limit workaround

Are there any ways to avoid limitation for api calls (5/sec)? I need the info about transactions and balance (of certain account), UTXOs and the ability to broadcast my transaction. Currently I am ...
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0answers
29 views

How to make a bitcoin block explorer? [on hold]

I need to create an block explorer for bitcoin. what is the most reliable way to create it.
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4answers
3k views

Ripple testnet explorer

This is Ripple main Explorer. But where can i find the transactions ledger from wallets on Ripple testnet.
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2answers
13 views

Calculating height of block

How do I calculate a possible height at which a block should be mined some time between 2 given times (say 8:00 am - 10:00 am)?
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0answers
17 views

Question on Blockchain-Based Data protection framework research paper

I am reading the paper Distributed Blockchain-Based Data Protection Framework for Modern Power Systems against Cyber Attacks. I am unclear if the data transmitted by the smart meters to the blockchain ...
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1answer
41 views

Blockchain is losing me money with every transfer

I'm losing up to 45% on a BTC transaction. When it reaches the merchant they say that I'm losing it in the transfer and that the chain is the cause. How true is this and how can I check with the chain ...
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1answer
21 views

51% attack + ignore blocks not mined by yourself [duplicate]

If you own 51% of the mining power and decide to ignore all blocks not mined by yourself. You would eventually end up having the longest chain, and would eat up the 49% of block-reward you werent ...
17
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2answers
3k views

Is “Reclaiming Disk Space” already implemented? How effective will it be?

Some people are concerned about the scalability of Bitcoin. The blockchain already has reached nearly 1 GB to download and store, which is not exactly in the spirit of a modern thin client, especially ...
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28
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1answer
10k views

What is the database for?

I see the block chain is stored according to the block chain format specification. But I also see there is a database, which is currently a leveldb database. Why is the block chain stored in two ...
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1answer
118 views

Confirming transactions in the Merkle root and SegWit

I'm trying to find out how exactly transactions are confirmed in a block. I understand that to confirm a transaction, you hash it with its associated transaction and then the associated hashes until ...
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1answer
21 views

What is meant with 'the highest PoW'?

What is meant when the nodes select the chain with the highest cumulated PoW? How is the highest highest PoW calculated? I thought the concept itself is called PoW.
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1answer
36 views

How do I make my coin seeds?

I want to add DNS seeds – like bitcoin – to my alt-coin. Is bitcoins generate-seeds.py and makeseeds.py the scripts to register DNS-seed ips?
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0answers
17 views

How to most efficiently keep in sync blockchain on offline computer (including through bitcoin-qt upgrades)?

I have bitcoin-qt running on online computer. I want to: copy blockchain to offline computer (preferably using WORM media for security reasons) from time to time update offline copy with newest ...
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0answers
20 views

Parse BTC transaction Input and output addresses from blockchain [duplicate]

I am experimenting with parsing the blockchain using rusty-blockparser. I am wondering if it is possible to parse large amounts of transactions/blocks, resulting in the input addresses and output ...
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3answers
48 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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2answers
52 views

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 ...
2
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1answer
53 views

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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2answers
33 views
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1answer
40 views

Unconfirmed transaction. Please help [duplicate]

Please help. Probably I set fee too small and now I wait 10 hours so far and transaction is not confirmed yet. Is there anybody who can help speed it up ?
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1answer
52 views

Are Bitcoin core devs contributing to ISO/TC 307 Blockchain and distributed ledger technologies

I was just being made aware of the standardization process about blockchain and distributed Leger technologies. https://www.iso.org/committee/6266604.html In this picture from the talk that I am ...
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1answer
29 views

Transfering btc from blockchain to electrum wallet, still unconfirmed

i transferred btc from blockchain to electrum wallet. it has like 132 confirmations but on blockchain it's still Pending: 0/3 Confirmations Status. I paid fee and everything. Is this something normal ...
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2answers
1k views

How to minimize risk when accepting zero confirmation payments?

I'm trying to setup a way of accepting Bitcoin payments in real life situations, where waiting for confirmations is typically not an option. I understand this is never 100% risk free (especially with ...
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0answers
17 views

Where can I crawl some smart contract data on Bitcoin?

I have to collect some real-world smart contracts from different platforms. I can find the real-time transactions and blocks of Ethereum from https://etherscan.io/. But where can I find the data of ...
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2answers
110 views

How would one prove he is Satoshi Nakamoto if he lost his private keys

Assume you're Satoshi Nakamoto, completely, and that you've forgotten your private key/s. How do you prove that this is true, using the BTC blockchain? Is there a transaction you can make, or a ...
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1answer
19 views

litecoin-cli: how to get block's txs?

Hi I am querying via rpc litecoin-cli. There are some differences from bitcoin-cli that I immediately found and can't figure out how to know : txs, outs, ins fees/txs: min, mid, max of the block? ...
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0answers
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Insta-mining problems, how to prevent being outgunned? And difficulty + adjustments

I created a new coin to learn something about Bitcoin. I cloned the source code, called it something different, put a new logo on it, nothing major. Then I made some nodes available, and put the ...
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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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1answer
38 views

What is off-by one error in updating target? How is it fixed?

Can some one explain completely what off by one error is? how is it fixed?
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0answers
31 views

Blockchain.info confirmation misunderstanding

I have some misunderstanding regarding how confirmation work on blockchain.info. If we go to payment history we can see info about confirmation in two places. First in history of all transactions. ...
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2answers
1k views

Are private keys published to the blockchain after spending coins from a wallet?

Always I spend coins the final balance of the address that is used for transaction will go to zero. The remaining coins comes back as a change to a new address. Will this indicate that the private key ...
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1answer
29 views

Can we I identify crypto-exchange (BTC) hot wallets?

I am interested in understanding, how the large crypto-exchanges handle deposits and withdrawals of BTC. I am aware of some examples of ETH-related hot wallets which are rather easy to identify but it ...
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0answers
31 views

Locating Bitcoin mining activity

There is any systematic way to locate Bitcoin mining activity (either block creation or node activity). I stumble upon with Bitnodes code which implements a recursive search using some nodes as "seed",...
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1answer
208 views

Are DAG-based crypto currencies as secure as proof-of-work based blockchains?

A key feature of blockchain based cryptocurrencies is that they provide inherently secure systems that don't rely on third parties. The newer DAG-based cryptos like Byteball are being touted as ...
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1answer
30 views

What happens if a country blocked external Bitcoin traffic?

Say a country decides to completely sever itself from the outside world, like so. Assume no leaks. As I understand, once the local miners process all the international transactions in everyone's' ...
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0answers
14 views

Majority attack against a new blockchain with few miners?

My friend wants to create a new blockchain to verify a type of transaction (details unimportant). His computer would probably be the only one doing mining / verifying the transactions, at least for ...
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2answers
51 views

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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2answers
43 views

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
79 views

BITCOIN SCRIPT: Write the bitcoin ScriptPubKey script for a transaction that can be redeemed by anybody who supplies a square root of 1764?

Bitcoin script: For the following questions, you're free to use non-standard transactions and op codes that are currently disabled. You can use as a shorthand to represent data values pushed onto the ...
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0answers
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not even one confirmation- still pending after 15 hours [duplicate]

please i am very bothered that my bitcoin blockchain funds which i have sent still showing pending and 0/3 confirmations after like 12 hours. I have sent 9.5 USD and a fee of 0.03 USD was taken. ...
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0answers
31 views

“Processing blocks on disk” taking forever

I started download the bitcoin blockchain on a 250GB hardrive with prune=0, txindex=1 on bitcoin.conf file. I downloaded like 95% at a rate of around 10% per 8 hours. I didn't have enough free space ...
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1answer
21 views

Can 2 blocks have the same previous hash?

Can two blocks have the same Previous hash after being created. 2 blocks totally different from each other but with the same previous hash
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2answers
38 views

How the different criptocurrency blockchains communicates?

I've learned that the different criptocurrencies have their own P2P software which uses their own blockchain network to work. So how does exactly occurs the process of exchanging one coin to another ...
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1answer
29 views

How data is searched in blockchain?

Alice has 500$ and bob has 1000$. Now alice wants to transfer 100$ to bob. Miners who got the chance to validate the transaction has to check whether alice have sufficient balance or not. where are ...
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2answers
29 views

Do the all coins/tokens have the corresponding network exploring sites/tools?

I see that Bitcoin has Blockchain.info, Ethereum has Etherscan.io. What about other coins and tokens. Is it obligatory for the given coin/token to have such blockchain exploring site/tool, is it a ...
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1answer
11 views

Blockchain: How do nodes know what Data is correct from Consensus process?

How do nodes know what data is correct from consensus? What about if two nodes execute two different consensus with 2 different Valid blocks with the same height at the same time, can that happen? ...
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1answer
50 views

Shorter Chains in blockdata

Assuming two blocks are published at exactly the same time, a race for the next block to be added to one of them begins, which eventually one chain will eventually win. My question: will the shorter ...
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0answers
18 views

Blockchain, correction of blocks

How do a malicious nodes correct their blockchain if they have it wrong? If they don’t want to fix it, what happens then?
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0answers
8 views

Ripple consensus: can 2 consensus take place at the same time?

So consensus process decides that, of many ledgers with the same sequence number, just one can be chosen. Consensus also closes the current ledger. But, can two consensus process take place at the ...
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1answer
24 views

Ripple: what’s the difference between “block” and “ledger”

I have heard many times that Ripple changed the concept of Blocks for Ledgers. What would be the difference between a bitcoin block and a ripple ledger?