0
votes
0answers
3 views

Bitcoin mining algorithm - target - Java

Default share difficulty is 1 (big-endian target for difficulty 1 is 0x00000000ffff0000000000000000000000000000000000000000000000000000) How to calculate this? How it look like on Java code? What ...
0
votes
0answers
1 view

Open-source blockchain explorer for regtest mode

I'm trying to find an open-source Bitcoin blockchain explorer that will work in regtest mode, so I can more easily inspect the blockchain, see what transactions are getting processed and included, etc....
0
votes
1answer
12 views

error durring the bitcoincore installation

I want to use python-OP_RETURN library. For this I need to install bitcoin core. But when I exceute this command sudo apt-get update I have this error : Err http://ppa.launchpad.net jessie/main ...
1
vote
0answers
10 views

Explanation about how to build network upon bitcoin blockchain

Sometimes, I would see some news says: xxx service is build upon bitcoin or base on bitcoin blockchain xxx servie is making use of current bitcoin network And today I see a DNS project says that it ...
1
vote
1answer
21 views

The randomness of vanitygen is secure enough?

If two people running vanitygen 1abcdefg What is the chance that both of the person will get the same public key & private key? I hope that the answer is less than 0.0000001. But for this ...
1
vote
0answers
11 views

What is it mean Difficuly & prob when using vanitygen?

I am running this command $ vanitygen64.exe 1abcdefg Difficulty: 778316249440 [125.17 Kkey/s][total 39015067414][Prob 4.9%][50% in 46.3d] What is it mean Difficulty? I understand that higher takes ...
-1
votes
0answers
17 views

WRONG BITCOIN ADDRESS HOW TO RETRIEVE [duplicate]

I SENT MY "BROKER" THE WRONG BITCOIN ADDRESS TO PAY AN ANNUAL FEE. I THEN SENT MY "BROKER" THE CORRECT ADDRESS AND HE CLAIMS HE CANT GET THE COIN BACK, IS THERE REALLY NO WAY TO GET THE BITCOIN BACK I ...
3
votes
0answers
10 views

bitcoind and onion listening

I would like to get Bitcoind to advertise that it is listening on an onion address. However, I do not want to have Bitcoind use a tor socks proxy to connect. I have a special router for tor ...
0
votes
0answers
10 views

Multisig: How to generate multisig script and address from multiple public keys?

I want to know how to generate a Multisig Script from a list of public keys, and how many public keys are needed. I already know how to generate a multisig address from a script.
-1
votes
0answers
15 views

bitcoin core question transaction not received [duplicate]

hi i download bitcoin core wallet at my home pc and than i send the receive address which generate by bitcoin core wallet to the merchant and than merchant send the transaction at that address but ...
0
votes
2answers
34 views

Reason behind hashing the nonce in prevBlockHash?

I understand the role that the nonce plays in the block header for calculating a hash for a valid proof of work. But what I ask is: Do we consider the nonce in the prevBlockHash calculation of the ...
0
votes
1answer
22 views

why scriptpubkey is different

I am confused when i see this transaction Test transaction with one input and two outputs Since scriptpubkey verifies the hash of the sender's public key and sender's signature, i am wondering why ...
0
votes
0answers
10 views

how can I hardcode a private key in bitcoinJ - ECKey constructor?

Can someone please explain how to use the following constructor (listed here): ECKey(BigInteger priv, org.spongycastle.math.ec.ECPoint pub) Say my private key is: priv = "L4...5". How do I get ...
0
votes
1answer
14 views

How can I sign transaction hex with Python library

I have a unsigned transaction hex. Now I want to sign this transaction input with my private key in Python. Are there any Python libraries? Transaction Hex ...
-1
votes
0answers
20 views

Antminer s9 profitability [duplicate]

How many blocks that antminer s9 solve per week , another way for the question how much time is required for a 12.93 th/s miner to solve a block ?
3
votes
1answer
38 views

Coin selection algorithm in Python to optimally select UTXO

Does anyone know of a good coin selection algorithm in Python that's perhaps similar to the one in Bitcoin Core (currently this: github/bitcoin/src/wallet.cpp (per guidance from stackexchange/1077))? ...
3
votes
1answer
108 views

Can you send amounts that would typically be considered 'dust' through the Lightning Network?

Reading through the Lightning Network Paper, it seems that amounts sent through an intermediate node use the Hash Timelocked Output construction. The thing I'm concerned about with HTLCs is that they ...
0
votes
0answers
14 views

Troubleshooting pybitcointools transaction signing/verification

I'm having several problems getting tests to successfully run under my fork (or vbuterin's pybitcointools, and I'm hoping someone with a combined Python / Bitcoin knowledge can provide some insight. ...
1
vote
0answers
16 views

Bitcoin Chainstate Leveldb sst

I'm trying to read the chainstate, and wrote a small Leveldb client to do so. When I run leveldb, it tells me Corruption: 960 missing files; e.g.: /opt/bitcoin/chainstate/890787.sst. Googling shows ...
1
vote
0answers
20 views

How can I find out if a mining pool has been leaking user information?

To my surprise, I have received spam to an email address which I exclusively used with a mining pool that seems to be generally considered trustworthy and reliable. The spam is bitcoin related and ...
0
votes
0answers
6 views

I need change the fee in my Multibit 0.5.19 to send Bitcoins that I sold, somebody can help me please?

I need to send my Bitcoins to other wallet. I update to Multibit 0.5.19 but I need change the fee, otherwise It will not do the transactions. How can I do that? thanks
0
votes
1answer
26 views

Bitcoin system with payins and payouts using bip32

I want to build an automated system, that can accept payments from users in bitcoin and can make payouts to addresses, specified by users, as well. BIP32 says, that the best way to accept payments is ...
0
votes
0answers
11 views

gridseed blade cgminer config

Does any one know how i can assign separate workers for each of my gridseed units? I cant seem to find any documentation regarding this, and i am hoping someone has already done this? My config ...
0
votes
0answers
14 views

Install bitcoin core on debian jessie error

I have to install bitcoin core to use op_return library. But I have difficulties to install correctly bitcoin core. First I run the command :sudo apt-add-repository ppa:bitcoin/bitcoin Second I ...
2
votes
1answer
23 views

Bitcoin address security [duplicate]

I understand bitcoin addresses are randomly selected from such a large pool that the statistical chances of someone discovering your address is very low. In light of the above is it still not ...
0
votes
2answers
31 views

Transforming private key into address [duplicate]

How do I get to the value in the 'scriptPubKey' part of the transaction ? shows a great example of going from address to scriptPubKey. I'd like to do something similar: go from private key (...
0
votes
0answers
7 views

resend a transaction with different fee? [duplicate]

If I create a transaction with too low fee, and it is not confirmed. Can I create the same transaction again, with higher fee, and send it to the network?
0
votes
0answers
8 views

a2 terminator pi not getting assigned ip address

I have acquired 2 A2 terminators, which i setup and were working fine. However, i have since moved the location of the terminators (to a cooler room) and reconnected them to my BT HUB 5. Now my hub ...
2
votes
3answers
97 views

A proposal for a genuinely distributed blockchain and pruning

The following idea is so simple that I cannot believe that it is really new. It must have been presented and discussed at length (and rejected) previously, but I submit it nevertheless, for lack of ...
0
votes
0answers
20 views

Bitcoin Core v0.12.1 wallet. Steps to diagnose “No block source available”?

I know that there are other similar questions, but I have been unable to understand and apply there answers sufficiently to the issue I am having. My client Bitcoin Core v0.12.1 running on Windows ...
0
votes
1answer
16 views

“Unable to find all tx inputs”

I've created a transaction using "bitcoinjs-lib". Here is the hash: ...
1
vote
1answer
25 views

Noob questions about transfering and offline security

I created a wallet on a USB and one with coinbase. I bought a bunch of bitcoin on coinbase and transferred .01 bitcoin to my USB wallet to make sure I transferred it right before I transfer ...
0
votes
1answer
172 views

I want to block my transaction [duplicate]

I made a payment to somebody and now he is not replying me regarding the product I made the payment for and think its a fraud. So I want to block the transaction. All I have is the QR code of the ...
0
votes
1answer
27 views

Attaching additional data / text message to a Bitcoin transaction?

I'm building an single page web app, where I need to send the users inputted string (email address) along with their bitcoin payment. Say for example I have a single page web app that issues gift ...
1
vote
1answer
25 views

Can a bitcoin transaction get confirmed unexpectedly?

Let's asume I make a transaction with no fee and doesn't get confirmed after a while (let's say 10 days). Could it be confirmed after that if for some reason some miner keeps a copy? I don't ask if ...
0
votes
2answers
56 views

What would happen if a private fork several hundred blocks ahead tried to merge back?

Suppose mining pool has been off the main network for a long time so that they are 100 or so blocks behind, but managed to mine 200 blocks in the period (say, some combination of had 33% before, ...
0
votes
1answer
21 views

Which bitcoin documentation is the official one for bitcoin core?

English Google searches about bitcoind and bitcoin-cli often lead to two sites: https://en.bitcoin.it https://bitcoin.org Any idea which one is the official one, endorsed by the maintainers?
1
vote
2answers
38 views

Is stack overflow reputation actually a Cryptocurrency?

In a way, it is already a currency since I can offer a bounty for my question. So is it correct to call reputation points from StackExchange a Cryptocurrency? If not, then why?
0
votes
0answers
15 views

What is the best Android App to check the price of bitcoin in the main exchanges?

Of course that's subjective, but post your opinion.
0
votes
1answer
17 views

Errors running bitcoind in the background

I have installed bitcoind on a new computer, and I use nohup to run it: $ nohup bitcoind & However, every now and then I see that the process does not exist, and I have to restart it using ...
1
vote
2answers
369 views

Bitcoind error -28

The following CLI command: $ bitcoin-cli getblockcount Gives the following error message: error code: -28 error message: Activating best chain... Any idea what is error code: -28?
2
votes
1answer
31 views

How do I generate multiple address with a master public key in pybitcointools?

I'm goofing around with this fork of pybitcointools and I got stock with generating multiple address for receiving coins with a master public key. So far, this is what I have: import bitcoin as btc ...
1
vote
1answer
23 views

How can you tell if a NXT public node is an archival node?

I'm looking to build a chrome app that queries the nxt decentralized data cloud using peerexplorers api public ip addresses here: http://www.peerexplorer.com/peerexplorer-api The question I have is ...
2
votes
1answer
38 views

Is it safe to import my private key into another wallet?

I sent some bitcoin to my bitcoin core wallet before it synced, not knowing this sync would take days, and was wondering if i was to import my private key into a different wallet if that would work?
0
votes
1answer
18 views

What is the value of using BitPay Card?

Like many here, I'm very much interested in using Bitcoin (or any derivative thereof), but I'm not having much luck doing it locally. I need a fix to this problem, maybe BitPay Card. I'm very much ...
0
votes
0answers
4 views

Regulation of the bitcoin ammount [duplicate]

I have an economical questions about the bitcoin. Question: How is the ammount of bitcoin controlled? Economically speaking this is an important part of a currency, because you don't want inflation ...
0
votes
0answers
23 views

Transfer of Bitcoin from Blockchain to my wallet

when I checked blockchain with my bitcoin address my bitcoins are there but not yet transferred in my xapo account. How can i get it?
0
votes
0answers
8 views

Mine Bitcoin with MinerGate [duplicate]

I just started with cryptocurrencies, and I would like to mine Bitcoins using MinerGate. The software does not include Bitcoins by default; how can I add them? I know that the pool URL is stratum+tcp:/...
0
votes
2answers
51 views

Bitcoin reversible strange transactions

I am aware that a normal bitcoin transaction cannot be reversed once broadcast and confirmed on the network. My question is whether it is possible to create a strange transaction with an unusual ...
4
votes
1answer
39 views

Maximum # of hashes for finding a block?

Since nonce is a 32 bit number, the maximum value of nonce can only be 4,294,967,296. So, if a miner doesn't find the target hash within this number, what happens?

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