All Questions

I am working on a donation based community website (using PHP) where participants register for an account to participate. Each account carries the participant's bitcoin address. A participant makes a ...

I have created a regtest node bcoin, I would like to know how to create the second regtest node to send transactions between nodes and you could also tell me how to generate addresses for the second ...

hello I am building a web application using nodejs, bcoin and my application provides the user with a bitcoin address in which to deposit funds, I would like to know how I can listen on my nodejs ...

In the BIP39 specification, you add 1 bit of checksum for every 32 bits of entropy you generate. Therefore, with a common entropy size of 128 bits, you are only adding 4 bits of checksum. This means ...

where in the Bitcoin Protocol is SHA256(SHA256(x)) performed and why?

I have manually a raw transaction using bit library in order to send a transaction using Litecoin testnet. After adjusting fee's and other network variables I got the following error that is stated in ...

Shown in the gray area here, describing how to apply, I think, Segwit to a transaction (particularly a Bitcoin Cash tx). The last section is titled "serialized signed transaction" however ...

I've followed the bip32 and bip39 specifications for generating the 512-bit seed, however I didn't understand how to generate the xpriv from this. I've used the left 256 bits for the private key and ...

I have a synchronous (1G/1G) network connection and I was willing to put up a full node that allows inbound synchs, but not without figuring out how someone opened a rogue wallet on my system. This ...

Bitcoin ransoms seem to be on the rise. Do exchanges or some organization attempt to put comprehensive lists or tracking of bitcoin addresses used for nefarious purposes that are available to the ...

I recently started mining with some left-over GPU time. My server is running Ubuntu. nvidia-docker run --memory="7g" -d kriation/ethminer -P stratum1+ssl://...

Fetching getnetworkinfo should result in IPv4 and IPv6 flags set to false and Tor to true. This will ensure that I am operating my node privately. But this is not the case for me. This is what I ...

I've forgotten my wallets password. Luckly I haven't got any bitcoins yet, still reading about bitcoins. My question is, now do I reset or create a new password for my wallet?

I don't fully understand the meaning of the witness version byte. I am not sure if I confuse the address format prefix bc1 with the witness version. My understanding: The extra byte reserved for the ...

When I connect to my bitcoind instance over RPC, I need a password for that, but no certificate. So how are man-in-the-middle attacks prevented on that connection?

I am designing an API which will utilize libsecp256k1. I am trying to hide most of the low-level stuff, and context is one of the things I want to handle for a consumer of my API. It would be ...

I am wondering for a single API platform where i will be able to trade for below 5 crypto currency : 1) Bitcoin 2) Litecoin 3) Ethereum 4) Dash 5) Monero So, are you guys supporting all these in 1 ...

I have heard that there are static AMP invoices that can be reused multiple times (at least in LND). But previously I understood that you should never reuse the same paymenthash, because you could ...

I'm trying to restore my old wallet which I had created on Multibit around 2016 and held a fraction of a bitcoin, as far as I can remember. I have not touched the wallet for years until today when I ...

I am new to development. I am working on a project and I am trying to use bcoin. I want to create an application which has a UI, where the user will be asked to enter Destination address and amount. ...

I'm using bitcoinlib for python to create a transaction and send it but I'm getting the following error: Funds not sent, exception error: Error connecting to blockchair on url https://api.blockchair....

I'm using bcoin and it's class FullNode to run a full Bitcoin Node. Here's the configuration: const node = new bcoin.FullNode({ prefix: '/mnt/d/bcoin', network: 'testnet', ...

I installed bitcoinjs-lib with command: meteor npm install bitcoinjs-lib. The installation command "flow-typed install -f 0.27 bitcoinjs-lib@2.2.0" didn't work. No idea what flow-typed is and the ...

So in a drunken moment of genius I had forgotten about, I bought some bitcoin way back. And I buried the address and key in some file... I was being tricky lol. That likely also led me to abandon a ...

Is the same private key using k and k*2 respectively in two different signatures vulnerable? If yes How to calculate the key in this case Here is an example, Both signatures are valid and the nonce of ...

This question seems to be asked every now and then when legal status of Bitcoin is discussed - Is Bitcoin a currency? What are the characteristics that would make it a currency, and what makes it ...

Is there a way to request the date of last transaction via API? I run a request to see balance of my addresses and need to request the date of the last transaction, how would I do that?

I'm working on a mining script and i just want to really be certain for sure as I wouldn't want to waste Time & resources. Q1 - Is the coinbase transaction automatically generated by the ...

I am looking for a CUDA program which will take a single argument, a brainwallet password, and output a BTC address. After reading through several threads on how to convert passwords to public keys, ...

I am doing a research project about Crypto regulation. From what I read, Know Your Customer and Anti-Money Laundering compliance from exchanges are legally required in the US. However, a quick search ...

I made a terrible mistake, I was doing some crypto transfers and I wanted to exchange ZMAX for XRP by mistake I copied the XRP contract instead of the correct destination address, I sent all my funds ...

I have heard many claims that transaction volumes can be "faked" for cryptocurrencies, but I am skeptical about how this is possible. I want someone to walk me through the math describing what you ...

Where can I find a full list of RPCs that are not listed in the output of the help command? (such as invalidateblock etc.)

just a general question, would it be ethical to start mining bitcoin using a shortcut, in the SHA256 hash (if that may even be possible), and mining at a much much faster speed using very less ...

Is it possible to obtain the date (time stamp) of each bitcoin block so far, using languages like PHP or R?. I am developing an analysis of the time series of bitcoin use for a scientific project, ...

I've been at this for days now without finding the links to click on. I have a Trezor wallet that I bought years ago. It has some bitcoins on it. I have the recovery seed, but I lost the pin. From ...

I am trying to generate BIP32 HD addresses from my Trezors xPub key. I keep getting errors with most of the libs our there. What am I missing? pywallet: from pywallet import wallet xpub = '...

I am a noob to this whole BTC thing, so please bear with me. I reformatted my computer and lost everything on it. I decided I want to restore my multibit wallet but I only have the following info: ...

I want to create a payment service where I want to be able to charge each client according to its invoice. I picked Electrum as my underlying wallet and pybitcontools as my Python interface. I would ...

What is the difference between capacity and max_htlc in the routing of payments in the network?

I apologize, I tried to make the title as concise as I could. If a Blockchain, say the Bitcoin chain, has some NFT that exists uniquely (by definition of an NFT) on that blockchain, what prevents the ...

I've got other Antminers working, this one just throws these errors in debug mode - is this fixable? [2014-01-30 19:03:10] Bmsc send golden nonce [2014-01-30 19:03:10] ANT0: GetResults (amt=0 err=-...

I have an old (2014) paper wallet I've deposited coins into over the years. I have another paper wallet that was generated around the same time, but wasn't used until last year. I just finished ...

I followed the instructions from this Reddit post on how to find my xpub address and tapped the wrench icon button and then "Detailed logs" in Ledger Live. The problem is that this xpub value works ...

I am trying to send a transaction in the cli using electrum with the command ~$ electrum --testnet payto mvYrQck9VfujSanmwvQxiLab3fLuywGdvh 0.01 -f 0.002 Password: (I entered the correct password ...

While looking in mempool i saw with increase in sat/vbyte the number of transactions decrease. are they somehow related?

I'm not looking for a number, but rather for a way to make an estimate taking things like market capitalization and the fact that mining uses ASICs into account. (I assume ASICs are relevant since ...

I'm using the bitcore-lib-cash to attempt to create an instance of Transaction (_fromNonP2SH). Transaction.prototype._fromNonP2SH = function(utxo) { var clazz; utxo = new UnspentOutput(utxo); if ...

I have a short message I wish to forward to this person. I don't have any "social media" accounts (nor can I get them). I'm not expecting a reply. I just want to comment on something ...

Using this post to define the format of a transaction: Create Output with a bunch of input Why is the previous utxo index (also called the previous output index) 4 bytes? The maximum output index ...