All Questions

Filter by
Sorted by
Tagged with
-4
votes
0answers
8 views

Ethereum Litecoin exchange for bitcoin

If you want to exchange any of the following currencies for bitcoin contact me now Ethereum Dashcoin Dodgecoin Ripple Litecoin Ecoin Bitcoin Cash Ethereum Classic Perfect money I need any of the ...
0
votes
1answer
11 views

How can Server-less communication take place between clients?

I was thinking to design a application which is not dependent on server and can directly send and receive data to and from other clients.I learned it is possible with UDP but how can new users join in ...
0
votes
0answers
17 views

Mining pools communicating outside of network

Does anyone know of any papers / evidence of bitcoin mining pools communicating outside of the bitcoin network for financial gain? It seems plausible in practice, but I am not sure if that has ...
0
votes
1answer
19 views

Is it possible to mine using Asics on AWS?

As title says, I would like to know if mining with asics on aws is possible and how to do it? I don't mean profit because I don't really care and only do it for fun. Thanks!
0
votes
2answers
40 views

How can I know which user made which BTC transaction?

I am making an app, and I want my users to deposit BTC coin to my address which is an exchange address (I don't have the private keys). How can I know which user made which transaction? I have a way,...
0
votes
1answer
29 views

How do miners communicate in Bitcoin/ Decentralized Network?

1.)If there is no central authority maintaining database how miners differentiate among other miners. 2.)Do they have there own database which have details(Mac/IP address) of neighbouring miners . 3....
0
votes
0answers
22 views

Error while syncing with the blockchain

So I already have the node set up on my raspberry pi. This night the transfer of the Blockchain from my laptop to the raspi's hard disk finished. Now I am waiting for the blocks to match the headers "...
0
votes
1answer
29 views

How to transfer amount to wallet [closed]

My friend has a bitcoin on tradebrite.net/ website and the website is not launching or opening the page. how can he transfer his bitcoin to some working website or wallet.
1
vote
1answer
26 views

If I am on a fork, can the reindex parameter fix this?

I've been reading confusing information online about what the --reindex startup parameter does. This link is not clear to me. https://github.com/bitcoin/bitcoin/blob/...
0
votes
1answer
21 views

How Bitcoin Core calculate extended private masterkey from hdseed

I am testing a Bitcoin application, and to test the signing of transactions I use regtest with Bitcoin Core. But I have some problems, the first I have already published in a question that I still ...
0
votes
0answers
13 views

Mining a private peercoin fork [closed]

I am trying to start a local test blockchain fork of peercoin. I have updated the genesis and network parameters, mined the new genesis hash and have successfully started and connected two nodes to ...
0
votes
1answer
46 views

Signmessagewithprivkey result is different than txinwitness

I'm studying segwit and I'm doing some experiment in regtest. I create a raw transaction with P2SH address. My Transaction data without signature is: ...
-1
votes
1answer
31 views

If i download the 160GB downloading , i will be global node?

i have a question , i've searched a lot but no answers i get i've installed bitcoin core and after opening the app , it is downloading about 160GB and its gonna take two weeks to be completed my ...
1
vote
1answer
34 views

How to reduce number of inputs in bitcoin transaction?

We have a bitcoin node running on a server which we use to generate addresses to receive small payments from the users. We receive tons of small payments daily right now and then we are using the same ...
4
votes
1answer
170 views

How many possible addresses per bitcoin private key?

Based on my research every bitcoin private key (compressed or uncompressed) can have 4 different addresses: P2PKH compressed and starts with 1 P2PKH uncompressed and starts with 1 P2SH and starts ...
0
votes
1answer
20 views

Is it possible to reference an input outpoint more than once in a transaction?

For example, could you have the following transaction: A --> B A --> C Where A is an input txid and index, and B and C are outputs? The reason I'm asking is because I believe with SIGHASH_SINGLE ...
1
vote
1answer
127 views

Paper wallet safety

I'm using the mobile "trust wallet" app, and my plan is (was?) to write down the mnemonic key and keep it in a safe place, then delete the app. Then whenever I need to receive or send money to a ...
1
vote
1answer
30 views

Does bitcoind ERROR “Disk space is too low!” refer to RAM or actual harddrive?

After having finished the "Initial Block Download" I needed to reindex: [BTC_Core_Expmnt]# bitcoind -reindex -datadir=/mnt/BTC_Core_Expmnt The debug.log showed everything starting up ok; and the ...
2
votes
1answer
28 views

how check bitcoind default values

How can I see which values bitcoind is using for eg. dbcache, or other memory and connection params ? If the value is NOT set in bitcoin.conf. Is there a bitcoin-cli command to check all the params ?
0
votes
1answer
22 views

Withdraw and deposit in cryptocurrency exchange website

In an exchange website we just book trades in our database and just when user want to withdraw his BTC balance we make a real transaction in bitcoin network for him. Consider a scenario that a user ...
0
votes
0answers
29 views

How does HASHSIG work?

I am reading an article about how HASHSIG works, but i don't understand this: Before the signature is computed, several temporary changes are made to the transaction: The signature script of the ...
0
votes
1answer
22 views

bitcoin-qt importaddress not working

using bitcoin-qt 0.19.0.1 on mac, I type this in console: importaddress someaddress "" false After I hit enter, the output is "null". What's wrong ?
-1
votes
0answers
20 views

Bitcoin network/solo [closed]

Let's say I'm in idiot was mining back in 2009 2010 I'm shure I moved 70 million in bitcoin about a year ago I got every wanna be hacker trying to or already have got all my info but to top it off ...
0
votes
0answers
20 views

Why stratum's data previous hash has that specific byte ordering?

I am doing some tests to understand the stratum protocol. If I connect to a stratum pool (slush in this case), and check the data I receive after mining.authorize, I get the following previous hash: ...
0
votes
0answers
24 views

What s the Bitcoin wallet or exchange house with the lowest fees? [closed]

What's the Bitcoin wallet or exchange house with the lowest fees?
0
votes
1answer
35 views

How To get Address Public Key from Account XPUB?

I am little bit confused or not able to get the right Address Node Public key from Account XPUB. What i have Done : 1==> Get the Account XPUB [78Bytes] 2==> SHA-256 3==> SHA-256 Again 4==> ...
0
votes
1answer
17 views

Receiving transactions in prune mode

I am new to Bitcoin. I have downloaded the whole blockchain but I still can't access my wallets because I get a popup telling me to use prune mode. My question is: I know that I have received ...
0
votes
2answers
36 views

How bitcoin finds a few transactions earlier account balance from outputs?

I am reading and watching about transactions and they say a transaction's input is previous transaction's output. They all show diagrams in which these transactions are consecutive. How an account's ...
-3
votes
0answers
19 views

Is there any legit cryptogenerator [closed]

Cryptocurrency needs to be mined, thats obvious but is there anybody who has ever come accross a legit bitcoin generator?? And are they currently available??
0
votes
1answer
37 views

Priv Key with 58 characters to WIF

I have an old paper wallet with Private Keys of 58 characters (all starting with a 6). These can be imported e.g. on blockchain.com, but since I still have BSV on this key, I have to import/sweep it ...
2
votes
3answers
1k views

Can a miner just introduce a block full of valid predetermined transactions in the blockchain and get rewarded?

My question is - let's say a miner has control over a certain number of bitcoin addresses. He creates a block containing small transactions to and fro from these accounts ahead of time in advance and ...
0
votes
1answer
35 views

Access coins stored at Cryptobridge?

I have just discovered, albeit far too late, that Cryptobridge has closed. Now, there is a lot to say about this particularly dodgy move, but I won't and I'll keep this simple: How can I access the ...
0
votes
0answers
19 views

How to disable log-in authorization on api calls? [closed]

I am trying to get my wallet balance using blockchain api. On each request, I receive email about login attempt authorization from blockchain.info. How do I disable that?
1
vote
1answer
35 views

Transaction malleability in Testnet

I want to replicate transaction malleability to study it. I have two transactions data signed in testnet. One it's the original, ...
0
votes
1answer
24 views

I've seen a transaction with 24 ancestors in the mempool, Is there a sensible use of this?

I've seen a transaction with 24 ancestors in thee mempool, Is there a sensible use of this? Or is a kind of spam or something else? It got mined on block 613101 $ getmempoolentry ...
1
vote
1answer
21 views

scriptsig-not-pushonly (code 64) during send transaction in regtest

I create a transaction in regtest without send it, I have transaction data signed. I modified a little bit the scriptSig in order to replicate transaction malleability, I add two operations (2 OP_DROP)...
2
votes
1answer
30 views

Why was the bip32 fingerprint used for bip174 psbt?

The fingerprint is widely used across the bip174 psbt specification. This is done to speedup parsing for a signer such that he can observe whether the master fingerprint for the public key for that ...
0
votes
1answer
35 views

Implementation of BIP39, I want to generate a BIP39 512-bits seed from 12 mnemonics but failed

I have a question. I used the website (https://www.mobilefish.com/download/ethereum/bip39.html) to generate a 12-words mnemonic(English word list) without password and got below: "organ rate senior ...
0
votes
0answers
13 views

BITCOINJ: how to make my wallet aware again about change of my transaction status after my server restart?

Using bitcoinj, my server created a transaction and it was broadcasted on the blockchain. I can get its history using: walletAppKit.wallet().getTransaction(txHash) It is in Pending state. Then I ...
0
votes
1answer
16 views

Ledger 8 pin number how hard in terms of entropy is it to guess?

ledger has a max. 8 number pin for unlocking it as far I know. I am very interested, can someone say if (given any method/resources) it is in any scenario (except luck) possible to guess this 8 ...
0
votes
0answers
15 views

why is getdescriptorinfo returning a “function needed” error with a sortedmulti descriptor?

When trying: bitcoin-cli getdescriptorinfo "wsh(sortedmulti(2,tpubDFck48zH8ZzteKKZCR9WMVBJwHZayhQmtCDyDRzHsU7VMTwEXohD23h1CBiizKtFtWck2fVegNDRM193nGx3VLs1RTSGNc1iePKpc1JvsS6/*,...
1
vote
3answers
38 views

How are UTXO forwarded to other addresses?

this is a pretty general, conceptual question. I feel I do not yet completely understand the blockchain transaction dynamics. Let's say, we have A, B and C trading on the Blockchain: A has ...
0
votes
1answer
30 views

How to generate legacy receiving address in Bitcoin core 0.19.x.x

I must have missed the memo. I see Bitcoin Core 19.1.0.1 defaults to generating Bech32 receive addresses (prefixed with "bc1"), and offers a checkmark to generate P2SH addresses instead (prefixed ...
0
votes
0answers
18 views

Can stablecoins be considered real cryptocurrencies? [closed]

Facebook has issued the Libra, Venezuela issued Petro, China issued DCEP. Can they be considered real cryptocurrencies? They are centralized, backed by other currencies, etc, so they don't seem like ...
0
votes
0answers
23 views

IBD problem: Reindexing blocks and syncing starts over every time I shut and open Core

I am currently doing IBD in segments due to logistical reasons, but each time I safely shut down Core and unplug my hard drive (HDD, 1TB) and then plug it back in and start up Core, it starts in 2009 ...
0
votes
1answer
28 views

`bitcoind` RPC: ask if syncing headers or blocks

Is there a way to know from bitcoind RPC if it's syncing headers or blocks? And is there a way to know the header sync progress? Even if not directly available, is it possible to derive header sync ...
1
vote
0answers
23 views

security of the mining algorithms litecoin vs bitcoin - scrypt vs sha256?

how is the cryptanalysis' current state on both sha256 and litecoin's scrypt? is litecoin's scrypt on a security level like sha256? by security i simply mean ways to "break"/"de-cipher" the hash ...
0
votes
1answer
34 views

How can non-backed cryptocurrencies be stable (like by algorithm) [closed]

Is it possible that a cryptocurrency can be stable, without being backed by another currency, for example stable by algorithm? For example, when the value is too high, the algorithm will increased ...
0
votes
0answers
19 views

Blocking Port 8333 and other open channels in bitcoin core

in another post someones wrote, Bitcoin nodes use to communicate with each other. You can disable incoming connections on your node if you don't like that (set listen=0 in bitcoin.conf). Now i ...
2
votes
2answers
26 views

c-lightning node backup-restore

How do I restore a c-lightning node from hsm_scret? I have tried running lightningd having the backed up hsm_secret. It shows no outputs and no channels. How can I retrieve the funds in the node

15 30 50 per page