All Questions

Filter by
Sorted by
Tagged with
0
votes
1answer
335 views

Dynamic Transaction Hash Confirmation

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 ...
0
votes
0answers
3 views

how to create second node regtest bcoin

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 ...
0
votes
0answers
5 views

How to listen to deposits and confirmations of bitcoin transactions

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 ...
2
votes
1answer
266 views

Is the checksum used in BIP39 mnemonic sentences too short?

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 ...
16
votes
6answers
11k views

Where is Double hashing performed in Bitcoin?

where in the Bitcoin Protocol is SHA256(SHA256(x)) performed and why?
0
votes
1answer
541 views

Litecoin - mandatory-script-verify-flag-failed (Signature must be zero for failed CHECK(MULTI)SIG operation)

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 ...
2
votes
1answer
507 views

What is a "serialized signed transaction"?

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 ...
0
votes
1answer
17 views

How to get extended key from 512-bit seed?

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 ...
0
votes
0answers
31 views

A rogue wallet was created on my Full Node. How did this happen? Can external users create a wallet on a Full Node?

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 ...
5
votes
4answers
4k views

Is there a way to blacklist or track ransomware bitcoin addresses?

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 ...
0
votes
0answers
10 views

Did I use the wrong wallet address? [migrated]

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://...
1
vote
0answers
35 views

Need help setting up Bitcoin Core full node over Tor (solely) and Tor hidden service. Tried a bunch

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 ...
1
vote
1answer
2k views

Forgotten wallet password (bitcoin-qt)

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?
0
votes
1answer
18 views

Witness Version bech32 and P2TR

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 ...
0
votes
1answer
18 views

RPC interface MITM protection

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?
0
votes
1answer
16 views

What are the risks of using a non-randomized context with signing contexts?

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 ...
2
votes
4answers
812 views

Single API Platform for multiple cryptocurrency? [closed]

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 ...
0
votes
1answer
14 views

How can AMP invoices be static in Lightning?

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 ...
0
votes
1answer
16 views

How long does it take for Multibit to synchronize an old wallet?

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 ...
0
votes
1answer
98 views

How to create an application which constructs a transaction using `bcoin` (javascript)?

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. ...
1
vote
1answer
19 views

Invalid transaction. Error: TX decode failed. Make sure the tx has at least one input

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....
1
vote
1answer
138 views

Bcoin initial blockchain sync progress isn't saved

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', ...
1
vote
2answers
109 views

Bitcoinja-lib. bitcoin.payments is null

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 ...
0
votes
1answer
1k views

GREP help: Bitcoin address/key buried as text somewhere on hdd

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 ...
-2
votes
2answers
199 views

How to derive the Private key when the two the nonces are k and k*2

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 ...
17
votes
4answers
1k views

Is Bitcoin a currency?

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 ...
2
votes
2answers
741 views

How can I get the date of the last transaction from the blockchain.info API?

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?
1
vote
0answers
10 views

Is the coinbase automatically generated by the getblocktemplete rpc call?

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 ...
0
votes
1answer
183 views

Is there a CUDA binary to convert a brainwallet string to a BTC address?

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, ...
0
votes
1answer
26 views

Why do several exchanges not comply with KYC regulations

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 ...
0
votes
0answers
21 views

I made a terrible mistake, please help me [closed]

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 ...
2
votes
1answer
176 views

What are the costs of cryptocurrency fraud?

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 ...
3
votes
2answers
149 views

Full list of RPCs - including hidden RPCs

Where can I find a full list of RPCs that are not listed in the output of the help command? (such as invalidateblock etc.)
0
votes
0answers
21 views

BitCoin SHA256 - ShortCut

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 ...
0
votes
2answers
362 views

Raw data of dates in all blocks using PHP or R

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, ...
1
vote
1answer
1k views

How to retrieve Trezor wallet with recovery seed?

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 ...
4
votes
1answer
1k views

Generate addresses from Trezor's xPub using Python

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 = '...
3
votes
2answers
801 views

MULTIBIT: How to restore wallet with following information?

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: ...
0
votes
1answer
522 views

How to generate Electrum address with pybitcointools

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 ...
3
votes
1answer
11 views

Difference between capacity and max_htlc in Lightning Network?

What is the difference between capacity and max_htlc in the routing of payments in the network?
0
votes
1answer
30 views

If NFTs are unique instances of data on a blockchain, what keeps a different chain from having the same piece of data?

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 ...
2
votes
1answer
2k views

Problems with Antminer U1 - why doesn't it work?

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=-...
-1
votes
1answer
58 views

old paper wallet shows missing balance after import; hacked? Bug? Confused?

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 ...
0
votes
2answers
1k views

How to see the entire history of my Ledger wallet?

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 ...
2
votes
1answer
136 views

I can't send a transaction from electrums cli

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 ...
0
votes
3answers
58 views

why does the number of transactions per block reduces with increase in transaction fees?

While looking in mempool i saw with increase in sat/vbyte the number of transactions decrease. are they somehow related?
1
vote
0answers
66 views

How much mining activity is needed for Bitcoin to remain secure?

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 ...
0
votes
0answers
19 views

How to create a Transaction with or without scriptPubKey?

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 ...
-4
votes
0answers
29 views

How would I contact Michael Saylor via e-mail? [closed]

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 ...
0
votes
2answers
25 views

Why is the previous output index 4 bytes?

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 ...

15 30 50 per page
1
2 3 4 5
559