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3 views

How can you generate a bitcoin Public Key from an existing Private Key using openssl?

I know that you can generate a new key pair with a command like. openssl ecparam -genkey -name secp256k1 And the resulting output will contain a new private key with the encoded public key. Is it ...
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0answers
8 views

When you buy bitcoin do you get the private key mailed to you?

Im very confused about how you get your private key and how u can transfer it
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0answers
10 views

How to connect a bitcoin node to a complete node through the local network?

I currently have a full bitcoin node on my local network and I would like to create another node but only update it by local network. I have tried with: ./bitcoind -connect<iplocal> ./...
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0answers
7 views

How to sign Raw Transaction with Multiple Inputs

What is the procedure to sign a raw transaction with multiple inputs, i have some doubts, this is what i am doing: Step 1 First I serialize 1 unsigned tx for each input. INPUT 1 02000000 // Version ...
0
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1answer
15 views

Monitoring BIP125 transactions in the mempool

Let's say I have a transaction with txid=A which has bip125-replaceable=True. If I bump the fee the original transaction will be removed from the mempool and replaced by the new one, so how do I know ...
0
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0answers
7 views

BTC-Wallet from “Airgap.it” asks for Receipient-Adress-Prefix “1ABC”. What format is that?

I am trying to set up a Cold and a Hot Wallet. Hot Wallet = "Exodus" on my everyday mobile phone. Adressformat is Bech32 with Prefix "bc1" or legacy-prefix from format "P2PKH" then adresses start ...
0
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0answers
13 views

Rest API for transaction

I would like to create an application (java, spring) that returns information about a given transaction for a given txid (and specific vout). I would like it to work for both mainnet and testnet. I'm ...
0
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0answers
12 views

Bitcoin peer info

Why when I run in the node bitcoin-cli getpeerinfo the list is an empty array? Do I need to let time to connect other peers?
0
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0answers
12 views

Parsing JSON in bitcoin-cli

I am learning the Bitcoin-cli, and when I run a command like getbalances, I get a JSON with "mine" and "watchonly". Is there a way i can only return the watchonly portion? My broader question is can I ...
1
vote
1answer
32 views

How proof of work works in Blockchain?

Sorry, if the question may seem trivial but it is bothering me for a while now. I understood how the proof of concept works when one tries to change an old block. But how that will work for the case ...
0
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1answer
31 views

Saved bitcoin dat file, unfortunately converted to Adobe

Is there a way to convert back or what do I do? I would have thought that the old dat files would still be somewhere on my PC. I never put them in a wallet ( .1 BC) so it was just a bunch of files. ...
0
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1answer
19 views

I accidentally used BTC xpub key to generate HD wallet addresses for BCH, can I recover funds?

I am using Exodus wallet and an eCommerce plugin to accept cryptocurrency payments. To generate the HD wallet addresses I needed to provide an xpub key. I accidentally used the BTC xpub key instead of ...
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0answers
11 views

Bitcoin core Rpc EOF?

I using regtest to test bitcoin core rpc in golang. package main import ( "fmt" "github.com/toorop/go-bitcoind" ) const ( SERVER_HOST = "127.0.0.1" SERVER_PORT = 18444 ...
0
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0answers
7 views

DMA and SRAM USB device or USB protocol

USB device have SRAM and DMA sub-modules: what is the role of SRAM in USB device?? a. How DMA controller knows to initiate a request to memory(either read or write)?? b. How Endpoint get data from ...
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0answers
12 views

Which crypto wallet do you prefer? How do you use crypto wallets [closed]

I am a beginner in Bitcoin topic. What are the advantages / disadvantages of using crypto wallet: where I have to put personal information where I do not have to put personal information And how do ...
0
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1answer
21 views

Strange BTC rate behavior when buying bitcoins

I have decided to buy some bitcoins using the Bitcoin.com wallet app and I have just received the invoice for my transaction of 1000 EUR to BTC. The rate of the BTC for the last days is always around ...
0
votes
1answer
13 views

Imported bitcoin address to block-chain un-spendable

I imported a bitcoin address to my block-chain wallet. The bitcoin shows as un-spendable in the wallet. The address was used previously by me and worked fine. How do i fix the problem to make the ...
0
votes
1answer
10 views

I want withdraw from BitPay and send USD to bank account in Puerto Rico. I reside in Argentina. Is that possible?

I want to withdraw/sell bitcoins that I have on my BitPay wallet. I need to transfer the results USD to account in Puerto Rico. I reside in Argentina. I have already tried with Skirll, but does not ...
0
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0answers
16 views

How to determine if BTC has been received from a particular address

I have been wondering if there is an api available that can enable me know if a certain amount of Bitcoin has been received from a particular wallet address. For the moment I have only be ...
0
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2answers
47 views

Generate P2SH-P2WSH

I want to generate P2SH-P2WSH with script P2PKH. My public key is 027712968e8f2f9dfa79abe10940a3d915a0c95a0b97750881e6201acf2b66da97 SHA256 and RIPEMD160 of Public key ---------- Witness Script ...
1
vote
1answer
41 views

Bitcoinjs-lib how to add multiple utxos in addInput

Hi i want to make transactions of bitcoin bech32 addresses using bitcoinjs-lib , here is my code below, it works fine when my address has only one utxos but when it increases to two or more as its ...
0
votes
1answer
9 views

Transaction Status: 0 / not confirmed, not in mempool

Trying to send BTC, but fail. The transaction is not in mempool. What to do with these and how to solve the problem? I already returned BTC canceled the transaction
0
votes
1answer
20 views

Will bitcoind import private keys for multi-sig descriptor with watch-only flag set to true?

I am importing a "warm" multi-sig quorum into bitcoind using importmulti like so: {"jsonrpc":"1.0","id":"curltest","method":"importmulti","params":[[{ "desc": "sh(multi(2,[eb2d2f9e/44'/1'/0']...
0
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0answers
11 views

Litcore-lib is not able to make txn from bech32 address

I'm Unable to make a transaction with litecore lib using bech32 address, although same code for bitcore-lib is working and txn is signing. const litecore = require('litecore-lib'); let utxo = [{ ...
0
votes
1answer
34 views

30 months of history, and 50GB of data?

I had installed bitcoin-wallet app on an old phone a couple of years ago, just out of curiosity about bitcoin. I obtained somehow a teeny amount of bitcoin, .0017xxxx anyway, I installed the app on a ...
0
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2answers
49 views

Can I lose my Bitcoin.com wallet if the company and the website database are destroyed?

I am planning to convert a part of my fiat currencies into BTC. I see that web wallet are a good balance between ease of use and security as it prevents breaking a device, being robbed physically, etc....
0
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0answers
14 views

Blockcypher make_tx_signatures “Bad Signature” error

I am having trouble to sign a transaction on Blockcypher Test Network (using python): import requests from blockcypher ( import send_faucet_coins, create_unsigned_tx, make_tx_signatures, ...
2
votes
1answer
65 views

Confusion about Addresses

I have a little bit confusion about addresses segwit and not segwit. I can see P2WPKH and P2WSH from this link https://en.bitcoin.it/wiki/BIP_0173, and they are segwit and start with bc (mainnet) or ...
0
votes
2answers
38 views

Creating a custom transactions

I am currently learning how to create raw transactions. I can already create standard using bitcoin core (0.19.1), but when I wanted to create with custom opcode like this: asm: OP_HASH160 ...
0
votes
1answer
30 views

How to find Reused R values

I use software from https://github.com/ca333/rng-scanner , I try to find r that is reused. from the software I found results Bitcoin Address : 1GQdrgqAbkeEPUef1UpiTc4X1mUHMcyuGW In Input NR : 141 ~ ...
0
votes
1answer
20 views

Why can't P2PKH's scriptPubKey be shortened to only OP_CHECKSIG?

For P2PKH, the scripPubKey is OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG. Why can't it check the signature only? Why can't it be shortened to just one opcode — OP_CHECKSIG? Why ...
0
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0answers
25 views

How can i mine bitcoins to direct wallet using JavaScript?

I heard that we can mine bitcoins using javascript direct to the wallet? How can I create Program, script or application which direct mines to the wallet & I even search online but did not get ...
0
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0answers
18 views
+50

How to construct and redeem a bip199 htlc with python-bitcoinlib

Playing with this script, I'd like to understand how to construct a bip199 htlc and redeem it, however this script fails on the OP_EQUALVERIFY and I can't seem to understand why. I'd like an ...
0
votes
1answer
22 views

Use case for multiple inputs in a single transaction

Is there a way to ascertain a pair or more of Bitcoin addresses belong to the same wallet on the basis an address pair was used as input for a single transaction? Can I verify the address pair input ...
0
votes
1answer
23 views

Can a 'free' Bitcoin 'marketing' ad be checked in any way

Total Bitcoin newbie here. I have no bitc, nor a wallet, nor am I sure I want one. I've been intrigued for a while, but security is a big passion of mine... Today just now youtube pointed me to an ...
0
votes
2answers
41 views

Why are hashes base16 (hex) encoded rather than base58 encoded?

BTC sha256 hashes are hex encoded (as sha256 spits out bytes not a string), why is this? Surely using base58 would be more efficient as would use less space (would output a shorter string)
-1
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0answers
17 views

Regular expression for the bitcoin gold network [closed]

Maybe someone knows a regular expression in order to recognize the address of Bitcoin Gold?
0
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0answers
15 views

Create electrum wallet (+android) for altcoin with POS [closed]

I want to compile the electrum source for my POS altcoin for windows and android. Is there any tutorial I can use to get started? Thank you for help.
1
vote
1answer
19 views

Can't send raw transaction Bitcoin Core 0.19.1 - non-mandatory-script-verify-flag (Signature must be zero for failed CHECK(MULTI)SIG operation)

I wanted to send a raw testnet transaction and I was doing it like in the bitcoin documentation, but I still get this error: non-mandatory-script-verify-flag (Signature must be zero for failed CHECK(...
0
votes
2answers
42 views

Sent bitcoin but was never recevied

After withdrawing bitcoin from a site I use I sent it straight to another site with a generated address, on my site it said it was completed but was never received on the other site. The three ...
0
votes
0answers
29 views

Most crypto exchanges have a similar API. What software (commercial or open-source) are they using in their back-end? [closed]

If I want to launch a crypto exchange today, which companies do I look for that can provide me with an out-of-the-box software infrastructure when I don't want to build one in-house? I'm talking ...
1
vote
1answer
52 views

Generate P2WSH native

I want to create P2WSH native like https://en.bitcoin.it/wiki/BIP_0173. I have already a script to generate P2WPKH and it works, thank the python part and re-arrange group byte works. I read that ...
0
votes
2answers
36 views

How do you type the ₿ Bitcoin Symbol in Android Google Keyboard?

Is there a way to enable the Bitcoin symbol on my Android 9 Google Keyboard? I dont see it anywhere.
0
votes
1answer
59 views

I lost my uncle few Weeks ago due to the covid 19 and I have his wallet

I have my uncle wallet and I don’t have his private key can anyone help
0
votes
0answers
8 views

prune error, cannot open my wallet

if i want to open my wallet, i get a prune error: I have done: 1. start bitcoin-qt with the option -reindex , result is the same 2. download the blockchain completly, result is the same I cannot open ...
0
votes
2answers
18 views

How can I execute `getnewaddress` at my full node from a remote server?

I have a full node running on a digital ocean droplet. I have an app running at heroku, and I want to execute getnewaddress from this app. I'm trying to generate BTC addresses to which users can send ...
0
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0answers
8 views

How could be useful the softforks field that provides the RPC command getblockchaininfo?

When I execute the command getblockchaininfo I see useful information but I don't understand how to be useful the information that is displayed through field softforks, the example below: bitcoin-cli ...
0
votes
1answer
26 views

How do bitcoin nodes agree who first mined ablock?

Once transactions are broadcast and a node starts working on a proof of work, and finds it, it broadcasts it to all other nodes for that block to be verified and added onto their blockchain. All nodes ...
0
votes
0answers
8 views

Fail to sign the Segwit Transaction's input in bitcoinj

I want to spend from a segwit address and it has a P2WPH script, I created this transaction just like creating a normal P2PKH transaction, but just changed the address of the input to the segwit ...
0
votes
0answers
13 views

in HD wallet implimantation how can I generate public key in master node?

As I know, in HD wallets, we have a seed that called "master seed" with 256bit length. When we want to generate the master node, we use a Hmac-sha512 with this seed as text and "bitcoin seed" as key. ...

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