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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16 views

nLocketime error PUSH TRANSACTION ERROR: 64: NON-FINAL

Created nlocktime with electrum and used the time date feature which is using unix time instead of block height number for the locktime. SO when pushing the raw tx before its time I get code 26 ...
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To what extent is the actual downloading of blockchain data what slows down a “fresh sync”?

I've just sat an old computer with fresh Linux Mint and Bitcoin Core installed to sync from scratch. Since its HDD is 250 GB, I had to enable "pruned mode" since the blockchain is currently ...
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1answer
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Are there any Bitcoin block explorers still around that log First Seen by node data?

Title.. Hoping to find out when a historical tx went into the mempool. I'm aware this is transient data and not in the blockchain. However i'm pretty sure I remember in the old days explorers used ...
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3answers
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how to generate bitcoin adddres using seed?

Hi i am new to bitcoin all i want to know is how to generate address using mnemonic seed? let testnet =Bitcoin.networks.testnet; let keypair =Bitcoin.ECPair.makeRandom({network:testnet}); let address=...
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I can’t btc money with my blockchain

So I tried sending out btc on my blockchain app but it keep saying code:-25 error,:bad-txns-input-missingorspent I don’t understand what this is and I would need help on how to solve this thanks in ...
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1answer
10k views

Is it chain of headers rather than a chain of blocks?

We know widely used explanation of the blockchain: "Every block contains a hash of the previous block". The sentence above implies that since every block contains a hash of the previous block, ...
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1answer
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Developers, programmers new to bitcoin engineering ecosystem

Any sites, forums dedicated to developers new to bitcoin. Any recommended git repo, site that shows how to interact with a node, do .i.e. p2sh,p2pkh on testnet.
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2answers
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Is this the ledger?

Lots of articles about bitcoin say that anyone can see all the transactions that have ever taken place, and they call that "the ledger." But none of those articles give a link for where to ...
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3answers
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Cache the Bitcoin Datadir to Improve Performance? Increase Bitcoin DB Cache Size?

Bitcoin is very disk-intensive and that slows it down. It seems to flush data to disk often thus preventing proper caching. With the datadir on a RAMdisk it is much faster. Is it possible to increase ...
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1answer
311 views

How mine cloned altcoin new algorithm? [closed]

Hi there i will created new clone for practice. Changed algo at cloned one For example nist5 to skein. I created genensis block. Created daemon and qt and nodes are connected. Everything is well to ...
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Best way to add META info to UTXOs? [closed]

I want to create a database of META tags associated with BTC UTXOs and ETH accounts. Eventually I would like to do the same for all major blockchains and their (multiple in some cases) assets. Ideally ...
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2answers
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What am I supporting? Anarchy? [closed]

I started buying crypto in 2018. I’m holding on for the ride...boom or bust. However, that doesn’t mean I’ll ever understand it, and I certainly don’t need to jump on any anarchic or utopian ...
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27 views

Lost Imported Address

What can I do to recover my funds? I had a few transactions sitting in my imported address and not in my actual wallet ( at that time I didn’t know I had to move the funds from the imported address to ...
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1answer
111 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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Pkscript Invalid ASM & Index 0 Details Unspent and unconfirmed should I stop/reverse I don't know how can anyone help me if there is an issue?

{ "block_height": -1, "block_index": -1, "hash": "3984a1904e15bc9a0bd7f8b51f8d940802ee6de9509a0a733b4562290ddaa961", "hex": "...
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2answers
128 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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31 views

how can I recover my money in blockchain wallet [closed]

I have blockchain account and I add transfer money and reflect to amount my wallet but after some time not show amount Please tell me now how can I recover my money
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How can I build the best crypto exchange business model? [closed]

If someone wants to build a crypto exchange business model with robust features and high-grade security checks, then what will you guys recommend?
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1answer
81 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
80 views

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
21 views

Do all of the records in the same block share the same hash?

From what I have read, when a transaction is settled, the record is added to a block among with other records. The block is given a new hash as well as a hash from previous block. So does that means ...
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1answer
73 views

I have forgotten my Blockchain account password and 12 word recovery. I have the wallet id and password to the wallet. Can i get my funds back?

I have forgotten my Blockchain bitcoin account password and 12 word recovery(possibly didn't even create one). However I do have my wallet id and the password to the wallet. Is there a way to get the ...
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1answer
42 views

Best way to store fund on the lightning network

Suppose that someone want to store 0.1 bitcoin on the lightning network for a period of 1 year to use services such as buying and selling things but doesnt know which one and with who yet. What would ...
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1answer
33 views

Understanding Transactions, Mining, and the 10 minutes block solved

I'm not entirely sure if the questions I have regard to Bitcoin all relate to each other? How do miners decide how many transactions they should have in a block in order to mine 1 bitcoin? When miners ...
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couple years ago I set up a coinabase wallet or blockchain wallet to make a couple of purchases. How do Iretrive any bitcoin left in that wallet?

A couple of years ago I set up a bitcoin wallet on blockchain. How do I retrieve any bitcoin left in if I don't remember all my passcode info. I'm VERY tech ignorant! HELP!! I'm on disability and ...
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0answers
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What type of interface would be best for creating my own Blockchain in Java? [closed]

So I'm trying to do a mini-project and create my own Blockchain. I'm not looking to make anything complex, just a relatively basic Blockchain. I feel like I understand the basics of how a PoW ...
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2answers
31 views

How can I determine where a BTC transfer from one of my accounts to another went wrong?

I have two BTC accounts on a Ledger S Nano hardware wallet, which I can check via the Ledger Live software. I've transferred BTC many times already, to my own accounts and to other people, and never ...
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2answers
173 views

How many transactions will be created in a Lightning Network channel

In a typical Lightning Network channel, how many Bitcoin transactions will be created per state of the channel that may end up on-chain ?
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2answers
60 views

How isn't blockchain fundamentally broken?

This question is a good 3 to 5 years late on the crypto trend but nevertheless I'm still having trouble to understand. The chain works by verifying every previous block, right? How does this not ...
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1answer
31 views

How do internet wallets connected to full blockchain nodes

How do internet wallets such as Coinbase connect to the a blockchain node? Doesn’t the node itself create a default wallet object on startup? How is this replaced by internet wallets which hold ...
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1answer
944 views

Where do I obtain private keys?

Just received my profits from a "watch only" address, where do I obtain private keys?
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Bitcoin balance vanished when transferring from bitcoin trading wallet to bitcoin wallet balance on blockchain app

I tired to move my full bitcoin balance from my bitcoin trading wallet to my bitcoin wallet balance on the blockchain app, but when I transferred it to my bitcoin wallet balance it never gave me ...
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2answers
454 views

Configure esplora to point to the bitcoind servers ip address

I have 2 servers running: Ubuntu 18.04 running bitcoind daemon (v0.18.1 full blockchain synchronized) Ubuntu 18.04 running esplora (the local single page website works, but it has no data from the ...
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2answers
186 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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1answer
43 views

how large a block can grow?

I was looking for a blockchain exchange but I didn't see so I am posting this in Bitcoin group. Apologize if it's too naïve. I've started to learn about bitcoin and blockchains. I don't understand how ...
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1answer
51 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
469 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
48 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
71 views

Jaxx and Exodus wallet out of sync for BTC

I was using both Jaxx wallet and Exodus in parallel using the same passphrase. However my Jaxx wallet was configured to generate a new address on every transaction and Exodus wallet had a fixed ...
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1answer
201 views

How many BTC addresses have balance in them?

Of all the possible BTC addresses, how many have balance in them? And what percentage of the total possible addresses is that?
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1answer
260 views

How do I double SHA-256 the header of block #59,500?

I'm not sure how to combine all of this information. https://blockchain.info/block/00000000096af43105123c499521e1d131d172e7e1bf2ed0843290a921f1f6a7 Version 1 Time Bits 470771548 (is this the right ...
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2answers
84 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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1answer
51 views

How does the blockchain know if its block hashes have been tampered?

I'm dealing with some problems to finally understand how implicit consensus works and I've come across with one question. Suppose the following: A malicious miner proposes the following block to be ...
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1answer
67 views

What is the difference between Consensus and Distributed Consensus?

This is more of a clarification than as a question. Since I didn't have the rep to post a comment in this question, I'm putting this itself as a question. Sources I've referred till now: A ...
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3answers
217 views

Strategies to Reduce High Transaction Fees in a Cryptocurrency Marketplace?

I’m building a cryptocurrency marketplace where users mainly buy and sell small ticket items (worth $10 - $50) using cryptocurrency. However, the "miner fees" are making it prohibitively ...
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2answers
43 views

Does this accurately show how a crypto-currency miner software works? [closed]

just got a question here: Does this flowchart accurately show the step-by-step workings of a typical crypto-miner software? I'm a newbie in the cryptocurrency business. Though I welcome comments and ...
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1answer
170 views

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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1answer
43 views

If only one Bitcoin miner gets the block reward, is it worth mining only for the transaction fees as a (not-so-competitive) solo miner?

I have heard (but not that knowledgeable) about mining-pools. If a weak system joins the pool, it has a chance to get a portion of the block reward, but I assume that not all of the miners are joined ...
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1answer
792 views

Bitcoin transaction graph

I am trying to make bitcoin transaction graph, but I am not sure how to go about it. I have extracted the necessary data from blockchain like the sender, receiver, amount of bitcoins sent, transaction ...
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2answers
275 views

How to you recover a stolen bitcoin lost to an investment scam?

I once lost my bitcoin to an investment platform and it took a while before I managed to get my bitcoin back. My question is I want to know how many people have lost their bitcoin and how do you ...

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