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bitcoin back-end blockchain storage

bitcoin uses blockchain so blockchain is peer to peer, every peer stores the data so I wonder where does the data of all the bitcoins is stored? who is peer in case of bitcoin? so that peer gets ...
0
votes
1answer
14 views

How is Bitcoin/Blockchain programmed to do multi transaction at the same time?

I read this article blockchaing stored and now I am bit confused. In this article it is described, that the transaction needs 15 seconds to propagate to the whole blockchain network. I know that the ...
0
votes
1answer
17 views

What is the algorithm that adjusts the difficulty of the proof of works in a proof of work based cryptocurrency?

For instance, Bitcoin has a proof of work based consensus algorithm, it's how Bitcoin chooses a node to create the next block in Bitcoin's blockchain. In this way the network is in consensus about the ...
0
votes
1answer
10 views

what are the dangers of transfering bitcoins between addresses?

So I heard stories about people losing bitcoins because their wallet didn't support a cerain feature.. or bitcoins getting sent to wrong address etc.. how does that happen? As a software developer I'...
1
vote
1answer
13 views

Wallet Recovery with Bip39 Seed

From having a list of bip39 seeds, is there any way of recovering a wallet? In particular, I have a list of ~100 seeds--one of which is mine--and need an automate way of figuring out which is valid ...
0
votes
3answers
22 views

Convert bech32 Bitcoin address to legacy

I know that similar tools exist for BCH (e.g. https://cashaddr.bitcoincash.org/). Is there a way to convert a native segwit bech32 Bitcoin address to a legacy format?
0
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0answers
10 views

How to set up a private Bitcoin network with low mining difficulty

I wish to set up a two-miner private bitcoin network. The miners need to compete for the hash power and the block generation interval is also set to be 10 mins. I found some tutorials about regtest ...
1
vote
1answer
21 views

Bitcoin core v0.19.0.1 automatically prunes?

Just finished syncing the whole blockchain after days and I realize the bitcoin settings were "pruning", which means I cannot use it as a wallet. is it the normal behavior of bitcoin core v0.19.0.1 ...
0
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0answers
21 views

I need someone who can help me acces my bitcoin address

Please I lost asses to my bitcoin private key and any white hat hacker to help me get it back
0
votes
0answers
8 views

Mycelium wallet won’t synchronize

In iOS app, Shows a balance before receiving BTC. The funds were successfully received at the generated address. Restored wallet with seed on electrum but shows zero balance. Don’t know what to do
2
votes
2answers
80 views

What meanings do the “NodeId”, “Version” and “Services” convey on Peers tab of Bitcoin-qt Debug window?

As shown in the picture, Is "NodeId" the ordered number (among all the existing bitcoin-core nodes) of the node that I am connected to? How does "Version" differ from the "User Agent" version (on ...
1
vote
2answers
27 views

BTC transfer duration

When BTC is mined, it is sent to the BTC wallet. The duration of the transaction can be up to 24h for online wallets. Is the duration faster, when transferring BTC to a “cold wallet”?
0
votes
1answer
31 views

Can we detect contentious soft forks created by the miners?

Can we analyze the blocks or the data sent per block in order to see if it includes new data that we do not recognize and assume that's a soft fork and invalidate such a block? Can a softforked mining ...
0
votes
1answer
13 views

Bitcoind is not synching, why?

My log was stuck on this for 30 minutes: 2019-12-09T22:33:17Z txindex is enabled at height 0 2019-12-09T22:33:17Z txindex thread exit 2019-12-09T22:33:17Z Bound to [::]:8333 2019-12-09T22:33:17Z ...
3
votes
1answer
32 views

Lightning Node High Availability/High Throughput

Are there any resources/best practises on running a highly available/high throughput lightning node? If my lightning service where to take off, should I be running multiple lightning nodes or a single ...
0
votes
0answers
16 views

21Million total BTC supply mined [duplicate]

What will happens to those miners of bitcoin? Do they still profit on mining?
4
votes
1answer
38 views

Discovering Bitcoin network topology

For a research I am doing I would love to have a graph with the network of reachable Bitcoin nodes. Active reachable nodes can be extracted by using getaddr messages (e.g. bitnodes project). However ...
0
votes
0answers
18 views

I can't access my freebitco.in account

I made a deposit in my bitcoin address in freebitco.in but when I tried to login I get this message " Incorrect login details" even though I'm sure I wrote the write email and password. Well I tried ...
0
votes
1answer
29 views

What if the blockchain saved space by trimming input txs on each transaction?

At each block there is a determined set of unspent transaction outputs. Each new transaction specifies the unspent outputs it's going to spend in the format tx_id:output_index. tx_id is 32 bytes. If ...
1
vote
2answers
32 views

What are some good solutions for analyzing Bitcoin script patterns?

I'm interested in analyzing the Bitcoin blockchain for occurrences of particular scripts and spending patterns. What are some good solutions for this? An ideal solution would let me filter ...
0
votes
1answer
14 views

Get scripthash for known scriptPubKey in PHP

I have to query addresses in ElectrumX server. How do I generate scripthash for a known scriptPubKey in PHP? Example address: array ( 'isvalid' => true, 'address' => '...
-1
votes
0answers
19 views

How to short dash? [closed]

Dash is the worst crypto in the world because it’s the most conservative. So, how do we short it (on leverage) and make a buck? How: 1 short it 2 wait to unshort 3 wait for high 4 recycle funds and ...
-3
votes
0answers
19 views

Exchanges to invest in [closed]

Investing in cryptocurrencies can be a highly profitable business opportunity, but you have to be able to follow the latest market trends and understand how to buy or sell on time. I am a new investor ...
3
votes
1answer
290 views

In LN, how could a payer prove to 3rd party that he indeedly made a payment to the payee?

For regular on-chain payments, a txid can prove at least a transferring of value indeedly happened, at a specific time, despite that it may be totally irrelevant. For example, a malicious user can ...
1
vote
1answer
72 views

bitcoind rpc interface, generate method deprecated in version 0.19.0 (latest)

How to generate a block in the new version of bitcoind. bitcoin-cli -regtest generate 1 The above command no longer works with the latest bitcoind package I want to confirm a transaction I have ...
1
vote
1answer
260 views

Solo Mining With CpuMiner (Guide / Adventure)

CpuMiner for Solo Mining Mode Guide. After you download the ENTIRE block chain, and u get ur bitcoincore running in Node Mode, just installing the program and allowing it in the firewall, u need to ...
1
vote
1answer
18 views

mining Blockchain Blocks

What if a miner starts to generate a new block hash based on trans data,latest block hash , timestamp and nonce , then in the middle of the work a new block has been added by another miner. in this ...
1
vote
1answer
28 views

How does the blockchain prevent spending money during a “short fork”?

I'm currently reading "Mastering Bitcoin" (i haven't finished it tho, but i don't see my answer and it bother me so I prefer asking it here) and there's something i don't understand. So from what I ...
0
votes
0answers
11 views

bitcoind CocoaPod or similar for Mac Bitcoin projects

So it's easy enough to compile bitcoind for Mac but I was wondering whether anyone had gone to the trouble of creating a framework which could be used to call on all the functions of bitcoind without ...
0
votes
1answer
17 views

Lnd - how to open a double-funded channel

I know about lncli openchannel, however this means I will open a (bidirectional) channel with my peer, but initially just my side will have some balance. Let's say I agree with a collegue running ...
0
votes
0answers
10 views

Is there practical Attack on A5/1 cryptosystem? [closed]

There are several and several attacks on A5/1 Cryptosystem, but most of them are impractical. In 2008, Elad Barkan , Eli Biham and Nathan Keller release a practical attack on GSM. Is there any ...
3
votes
1answer
51 views

Is there a way to allow use of unconfirmed RBF outputs in transaction building?

Bitcoin Core seems to not consider unconfirmed outputs that are marked replaceable in input selection. Is there a way to override this protection and allow use anyway? The transaction is created using ...
0
votes
1answer
19 views

Unable to sweep account using WIF, Green wallet says “No UTXO found”

I am trying to learn the process BTC transactions. In the process, I generated Private key : 82e8034869c77744655899d450f9fe2f01fad030bf8af4ea75b310d1a140f554 Corresponding address generated : ...
0
votes
2answers
27 views

How Bitcoin mining contributes to confirmations?

Based on my knowledge I know (maybe wrong) when a miner is doing hash, he is inputting any arbitrary values, in order to get a value that can be hashed into something with certain preceding zeros. ...
0
votes
0answers
13 views

bip39 checksum python

Is there any Python package which will allow me to verify if the checksum of a bip39 mnemonic is valid? For instance, I have a 24-word bip39 mnemonic, and I might have made a mistake for one of the ...
0
votes
0answers
17 views

Factors affecting Bitcoin pricing [closed]

I have two non technical queries pls. Maybe the scientists here can answer them. What factors influence the price of crypto currency? Is there any benchmark index for the crypto currency? I am ...
3
votes
1answer
26 views

Signing a raw transaction with multiple inputs

So I am creating a simple P2PKH transaction and after I researched about this found few useful posts and answers here; I was able to successfully spend a a single P2PKH UTXO but it is really getting ...
0
votes
0answers
14 views

BCH to BTC by accident [duplicate]

I sent BCH to a place that only accepts BTC by accident. If they don’t take it why didn’t it come back to my account. It’s not in my account. Uh they say they don’t have it and I have a transaction ...
2
votes
2answers
52 views

Lightning - why are commitment transactions supposed to use different keys

In the paper BIP32 and deterministic key derivation are mentioned. But why given that two peers directly exchange messages (i.e., there is no need to obscure anything)? Alice always exchanges state ...
6
votes
3answers
91 views

Why Coinjoin need other participants to increase their privacy?

Coinjoin is a method that make a transaction with other transaction of other parties to hide the link between txin and txout. In case of this, why we need others transaction? We have many bitcoin ...
0
votes
1answer
42 views

Calculating the cost to send bitcoin?

This is a follow-up post to this question. I am using Electrum to send Bitcoin. From what I can gather, it doesn't seem like there is a way to know your "inputs" upfront. The inputs are the various ...
-1
votes
0answers
20 views

24/7 BTC price monitor on Android devices [closed]

Is there any existing app that has widget flashes on the main screen or when the phone is in idle like TIME update
1
vote
1answer
33 views

Can attackers change transactions during a 51% attack?

If in a 51% attack transactions can be reversed, isn't it possible that the chain with more hash rate also changes transactions (for example if x sent 5 btc to y, they would change it to x sent 500 ...
0
votes
1answer
29 views

Mini-seed of single utxo

Let's imagine we have a cold storage wallet that has multiple utxos inside of it and we have a master seed for this wallet. If we want to spend from coldstorage but want to go first through a new ...
0
votes
1answer
28 views

How can I print these information using this library?

I want to know how through using this library I can print information about the current block that the world mine right now and I mean by that: Version, Previous Block, Merkle Root, Time, Bits, and ...
2
votes
1answer
46 views

Is the ordering of blocks in the rev*.dat files same as the blk*.dat files?

I understand that blk*.dat files save the blocks in the order it gets them from it's peers. Is the rev*.dat files in the same order as the blk*.dat files? For example, would the 400th magicbyte in ...
-2
votes
0answers
30 views

How much would being a millionaire (in BTC) cost? [closed]

You know how people talk about how they want to have a million dollars? Well, I have a far more...golden question. How much would it cost to get a million bitcoins? This number (unless you have all ...
0
votes
1answer
13 views

How to obtain your nodeID (QR code) in eclair-mobile?

I want someone to open a direct (no hops between us) channel to me in lightning (she will be the funder, I'll be the fundee). How can I get the QR code of my node in my eclair wallet to show to the ...
2
votes
1answer
34 views

PBFT algorithm - how do we know how many nodes are faulty?

I am reading this article about PBFT and I have trouble understanding how it can be used in practice. If we don't how many nodes are faulty (which I believe is a valid assumption), then how can we ...
0
votes
0answers
21 views

How to implement 2/2 multi-signature transactions with bitcoinj

I am using bitcoinj to implement a 2/2 multi-signature transaction. Now I want to use bitcoinj to generate a 2/2 multi-signature address and its corresponding Redeem Script through the public keys of ...

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