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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If nonce can change the hash then it should be changing the next block's previous hash?

I am studing blockhain and i know that a block hash is linked to the next block in previous hash and it cant be changed for valid reason. Reason is : because if someone have changed hash then then he/...
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Get/Calculate Address

I'm currently using a program that analyses the block files. It splits all the stuff into multiple .csv files. Is there any method I can do to get the addresses & amount sent/received from tx_in ...
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What exactly is a “blockchain developer”?

Hello everyone. This isn't specifically a bitcoin thread but due to recent events I think it is important that people get an understanding of the real Elon Musk as I have no doubt he will try and ...
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Submitting new block to blockchain

Supposed that I have managed to mine a new block that meets all requirements successfully by building my own script that can collect transactions and add them to new block and hashing the new block ...
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Is there a way to change Bitcoin Open Source code to be more Environmentally friendly?

If Bitcoin is open source as proponents mention, why can't make Bitcoin as environmentally friendly as Ripple, Dogecoin, Cardono etc? Elon Musk tanked the market by mentioning Dogecoin is More ...
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3answers
528 views

Is it possible to track physical objects on a blockchain?

I am currently working on a project for school in which we have to come up with a product. I won't go into the mechanics of my product but essentially what my group has come up with is using tracking ...
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122 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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Where can I turn the unique hash result of SHA256 to bitcoin?

i watched on youtube from 3Brown1Blue channel about "how bitcoin works", it said what makes bitcoin valued is come from the unique hash result of SHA256. for example if someone put string to ...
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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
39 views

Normalising between UTXO and Account based currencies

I am working on a project where we need to get the "from" and "to" address for every transaction across a number of cryptocurrencies. In account-based currencies, this is pretty ...
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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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If there are a significant number of pruned nodes on the network will it impact network security?

The size of the Bitcoin blockchain is reaching 350 MB and adding more than 60GB per year. I feel verification node centralization a risk if the cost of storage does not drop. My question 1: Is using ...
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How does bitcoin implement checkpoint mechanism to finalize the blockchain history?

I read in Peercoin whitepaper that to prevent large blockchain reorganization, bitcoin also implements checkpoint mechanism which finalizes the blockchain history. Can you explain how exactly bitcoin ...
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pBFT vs PoA what are the key differences [closed]

so i was watching a video on PoA and it kinda threw me off, those two (pBFT and PoA) are prett similar, arnt they? @pBFT you get about 20 or less pre-chosen validators, their identity is mostly likly ...
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How is a Block build under BFT (pBFT / FBA) [closed]

the last couples of days I was held up with PoW and PoS (dPoS) and the process how to "produce" a new block seemed fairly easy. PoW is just hashing stuff together hoping to find a hash below ...
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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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why do i lost my bitcoin on blockchain wallet without forgetting private key?

This is the first time to use Blockchain and send my bitcoin into it. But i was sent into private key wallet address and store it. Next day, when i was login my wallet and say wrong password . So i ...
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15 views

How to link a transaction to the chain? [closed]

Is that means searching the transaction's block? And how to do that?
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During a IBD : Initial Block Download by a full node, from where is the blockchain downloaded?

I understand that a full node requires to do an IBD before being able to verify transactions. So, it downloads the ledger upto now, which is known as Initial Block Download. But what I don't ...
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1answer
38 views

How transaction happen in blockchain?

Suppose there is a cryptocurrency with a chain of 5 blocks. When users trading with this cryptocurrency, then:- how the buy and sell will be going to happen i.e. Which block will make the transaction ...
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Deep Understanding of Proof of Stake [closed]

I'm trying to get a grip of truely understanding consensus algorithms and at the moment im trying to "figure out" PoS - the fundamental concept and process are clear but some few, maybe ...
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Bitcoin Fraud/Recovery Protocol Proposals

Does Bitcoin plan to implement any Fraud/Loss Prevention in their protocol? I just read a story of how Brokerage Exchange Shapeshift, and Internal Employee stealing private keys from their customers. ...
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Can I find the address of my Bitcoin in the debug.log file?

I cannot download the entire block chain (I’ve tried four times now and failed) so I can’t replace my encrypted old wallet.dat file into the blockchain and do the rescan to check my coin balance. My ...
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556 views

Why is the full blockchain required, effectively forever?

I do understand that every block is validated in terms of the blocks before it by way of the previous block's hash, all the way back to the genesis block. However, could the protocol be modified such ...
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1answer
22 views

Are trades done on exchanges added to blocks?

I found a few answers to this question here, here, and here, but my doubts weren't cleared. Are trades done on exchanges added to blocks? Or are they only added once you withdraw the funds to your own ...
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Can I see the workings (console) of my bitcoin full node?

I have just completed the IBD of my bitcoin full node on Bitcoin Core on Linux. When I open Bitcoin Core, i just get the basic wallet interface. It there anyway of seeing what the node is doing behind ...
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218 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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60 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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1answer
51 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 ...
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Did Bitcoin founders know Bitcoin is not scalable at Base Layer?

Given Bitcoin takes 45 min per Transaction, and consumes lot of energy (around 1 million Visa transactions), https://digiconomist.net/bitcoin-energy-consumption/ This is more of a history question, ...
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Transaction blocked by Blockchain [duplicate]

Payment was processed to me. Fees were requested to pay to sender. Transaction was unconfirmed and due to delay I was requested to pay the following fees to unblock transaction. Is this correct?
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96 views

If Lightning Network takes transactions off Blockchain, would that defeat the whole purpose of having a Blockchain ledger?

Currently Bitcoin transactions can take around 45 minutes. If everyone in the world uses Bitcoin, computers would have to consume 1000 of terabytes per Hour. The solution is the Lightning network, ...
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545 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
40 views

how to recover funds from blockchain

I forgot my password of Blockchain Wallet and i tried to recover from (12 word backup phrase key but it has generated a new wallet) on the same 12 word backup key and it has different (wallet ID) but ...
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1answer
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What to look for in Bitcoin-core logfile when something bad happens

About a week ago I was trying to reorganise my file structure with Bitcoin Core, I accidentally moved the file before listing it as a backup so when I opened Core, it didn't work. I tried returning ...
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Will BTC script be Turing complete in future?

I want to know if BTC script will have loops in it in the future?
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1answer
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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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59 views

Will Bitcoin copy Best Features of Litecoin, Ripple, if its Open Source?

Proponents of Bitcoin always mention that Bitcoin is Open Source, so if any better cryptocurrency comes along, Bitcoin can just copy those features in their open source. Both Litecoin and Ripple have ...
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1answer
1k views

How do blocks signal whether it supports segwit for the 95% threshold?

Ideally, I'd also like to see graphs that indicate how close we are to segwit adoption and the number of minimum blocks we are away from actual segwit adoption.
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1answer
282 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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1answer
22 views

How to implement multiple wallet folders located out of the bitcoin blockchain folder?

After substantial research I could not find any solution for this seemingly simple implementation of the Bitcoin-Core app. Here is what I am trying to achieve: Running a full node on one computer ...
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1answer
27 views

Balance in bitcoin-qt suddenly significantly diminished after a small transaction?

I had my wallet stored on a storage provider for a while, and recently got a new computer and installed bitcoin-qt and imported my wallet. It said I had about 2 BTC and showed INGOING transactions ...
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1answer
54 views

51% attack, miners, nodes or both

If 51% of the hashrate was controlled by bad actors mining invalid blocks, this would become the longest chain. Where do nodes come into the 51% attack? The canonical chain is the longest chain. Is ...
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109 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
34 views

How much info share bitcoin nodes between other nodes?

1.If we assume bitcoin nodes share the other nodes addresses in the end every node know other nodes adresses right? 2.If we share data through network every node share the same information other ...
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1answer
1k views

Is this an incoming or outgoing transaction

I recently looked at this bitcoin transaction: transaction: 3b0e8fae9640e1d043cfef14815c6885e58d71e7ee31cfa53f9c9d5acb138a4d For those who do not want to look at the transaction, I will give a ...
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1answer
41 views

How do nodes contribute to security when the power comes from mining and what is the chain of transaction validation?

Blockchain security comes from the decentralisation of hashing power by miners. They append transactions to a block, perform PoW and add them to the blockchain when that validate blocks. How do nodes ...
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50 views

Can a full node understand the transactions it downloads in a blockachain network such as BitCoin?

I'm asking this on behalf of a friend, who asked me to find out something about BitCoin full nodes. I understand a full node downloads and validates the entire transaction history. The question is: ...
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1answer
33 views

How are txns sorted correctly in Merkle trees between nodes and validated via Proof of Work

I am interested in exactly what happens to transactions in the pending block (block that is being mined at the time). From what I understand, transactions are the stored as a Merkle tree hash inside ...

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