1
vote
1answer
11 views

Safety of wallet setup

I just set up my Electrum wallet using live instance of Tails Linux distribution. I've written down the seed on the paper (and I remember it as well) and restarted laptop. I plan to do all Bitcoin ...
2
votes
1answer
10 views

Merkle tree structure for 9 transactions

I've been reading the developers documentation, other sources and the good books about Bitcoin. But none of the resources shows a merkle tree with 5 or more leafs. I'm confused, does the bitcoin core ...
1
vote
1answer
21 views

Cannot check balance with blockchain.info API

I tried below code and gave valid credentials, but we could not get the response of balance check. What would be the solution? <?php $guid="xxxxxxxxx"; $main_password="xxxxxxxxx"; $json_url = "...
0
votes
0answers
10 views

Why wont BfgMiner reconize my usb device?

I have a Gekko Compaq I have it pluged in and I set up BfgMiner but am stuck it asks me to press M then + to search for miner. I can't get the system to reconize my usb port Miner. What gives this ...
0
votes
0answers
13 views

Sign transaction hex with PHP library

I have a unsigned transaction hex. Now I want to sign this transaction input with my private key in PHP. Bitwasp library looks nice. But I can't find how to sign my transaction. Can you give me any ...
2
votes
2answers
28 views

Is it possible to know the total hashpower backing a currency?

Is it possible to know the total hashpower backing a currency ? My goal is to know how much hashpower is backing each currency. I don't know if it's possible, if so, how ?
2
votes
1answer
40 views

Bitcoin investment vehicles

I've heard of at least 2 financial products which enable people to take positions on bitcoin in the stock market. Here's a Reuter's article on one. Can anyone explain what the purpose of these ...
0
votes
1answer
14 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
4 views

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
14 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
18 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
30 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 ...
2
votes
1answer
24 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
23 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 ...
4
votes
0answers
20 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
15 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 ...
1
vote
2answers
45 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
11 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
16 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
28 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
40 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
110 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
17 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
17 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
23 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
12 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
24 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
109 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
21 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
26 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
174 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
27 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
40 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
35 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
24 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 ...

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