All Questions

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 ...

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 ...

I am trying to learn the process BTC transactions. In the process, I generated Private key : 82e8034869c77744655899d450f9fe2f01fad030bf8af4ea75b310d1a140f554 Corresponding address generated : ...

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. ...

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 ...

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 ...

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 ...

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 ...

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

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 ...

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 ...

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

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

Hello I hope u reply my message... Bitcoin deposit and withdraw rate same or not...and can I deposit with local bank and withdraw in Bitcoin after profit..how much time to withdraw process

Wallet.dat in the mobile hard disk is not backed up after sending Bitcoin, what can i do if the data recovery cannot found it? I have the original wallet.dat and private key， but there are no coins in ...

Hello Friends can anyone tell me how to update digital currency rates if anyone one has knowledge kindly help me

I am unable to find the address that holds my balance in Bitcoin Core. All receiving addresses has a balance of 0. But there is a balance in the wallet. How do I find the address that holds that ...

How do I retrieve a bitcoin sent to an email address from coinbase and the email address is not registered with coinbase...

If I type this locally: electrum server Then I see the correct details: { "summary": { "end_balance": "0.009", "end_date": null, "from_height": null, "incoming": "0.009", "outgoing":...

I have an automated system that sends BTC payments via Electrum for a client. Now, it happens again and again that payments keep failing with "min relay fee not met" (RPC call failed: {"code":-32603,"...

I am able to execute calls on the server from the server. When I say calls, I mean like this. I.e. I can get the latest addresses doing something like this: $ch = curl_init(); curl_setopt($ch, ...

I’m trying to get all transaction ids in the memory pool as json array. I just finish downloading bitcoin core and do now know where to begin. Any help would be appreciated!!

My broker asked Me to pay verification fee which is $670 and provide my ID I wanna ask is it legit to do that ? I invested 350 and earned $12000k

I'm looking at Bolt 3 in the Lightning rfc. My question is about how a HTLC is redeemed. Example HTLC script for reference: # To remote node with revocation key OP_DUP OP_HASH160 <RIPEMD160(SHA256(...

How can a web site accept payments via credit cards (or at least PayPal) and deposit Bitcoin (or other cyptocurrency) into a wallet? Essentially, I'm looking for the other direction of this question ...

I have some coins, and I would like to try to make the bitcoin price move up. However, I'm not sure how one would do this, so I'm just asking for how it could be done for fun.

I would like to be able to predict the price of bitcoin using a simple python program (or C program that can be compiled easily) because I want to see into the future. I know that this by definition ...

In Eltoo the set-up phase is similar to Lightning. You fund a n-of-n multisig (usually 2-of-2). Of course you don't want to publish this until you have a bail-out possibility - called "settlement ...

I'm studying Bitcoin Core currently. I found incomprehensible code, that shows making a transaction is rejected if there are same output addresses in a transaction. See Fig1, Fig2 Origin source code ...

A sender in the Lightning network can choose a path with up to 20 intermediaries (BOLT4). Tor is another network that uses onion routing for anonymity. However, in Tor all paths have 3 intermediaries,...

I haven't received my funds as from the address wallet provided was not correct what can I do to get my funds

in bip 34, which change to bitcoin version 1 -> 2, uses two step for network's consensus. step 1. check if 750 of the last 1000 blocks are version 2 or greater. step 2. check if 950 of the ...

I am really fresh here and I got such notification AppCoin - Closed by 415 (+6%) New entry BUY: 395 Sat. (+-10) 1. Sell 420 Sat. (+6%) 2. Sell 427 Sat. (+8%) 3. Pamp 435 Sat. (+10%) 🏴 1. Stop - ...

At first of all i created one account on coinbase to profite the new promotion of coinbase. But my question is: I would like to know how much time i can use the 10 dollars free in coinbase whrn i ...

Hi am building one hobby project and i want to perform some operations in my own bitcoin core 0.17 by using bitcoinj lib. so is there any way by which we can use bitcoin-core 0.17,bitcoinj for hd ...

I've selected an arbitrary transaction id and retrieved its associated transaction details using the blockcypher explorer as follows: from blockcypher import get_transaction_details ...

How was bitcoin private/public key created in 2009, I observed in the blockchain some bitcoin transaction took place early 2009 Feb - April. In the original bitcoin core in github the first bitcoin ...

I sent bitcoins to the address I was given (double checked). The recipient is claiming they did not receive it. I sent them a different payment yesterday at 8:30p and they didn't get it until 4:00am ...

Generally I see that bip32 derivation paths are something like m/1/2/3/4, etc How deep is allowed? Is there a limit on how deep the tree can go?

I used the following script to generate my private key and the corresponding segwit address. Then to test it, i sent funds to the address and imported the private key on blockchain wallet; RESULT: ...

I'd like to call RPC programmatically, instead of using bitcoin-cli. when I call the function RPCConvertValues(), it always raise error RPCConvertValues() is defined here : https://github.com/...

Aside from cryptocurrencies, what advantages may blockchain(either public or private) have and real life use cases that can be more useful implemented in blockchain over traditional databases based ...

I want to generate a vanity BitMessage address to receive and send message from. I this is possible for Bitcoin itself, but what about BitMessage?