1
vote
1answer
13 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
148 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
24 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
14 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
0answers
23 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
0answers
14 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?
0
votes
2answers
28 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
14 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
14 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
361 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
21 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
21 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
30 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
16 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
22 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
49 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
32 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?
0
votes
4answers
49 views

If bitcoin exchanges can be “scammed” why is bitcoin better?

Reading a post about someone getting scammed in an exchange and thinking about becoming a bitcoin user, now I am wary about this form of currency exchange. If the exchanges can scam you, see How to ...
0
votes
1answer
9 views

Set a public node to auto forge / mine / stake in NXT / Ardor without login via the gui?

Installed nxt/ardor on my public server and would like to have it auto mine / stake with an account. How can this be done without having to login to the gui?
0
votes
1answer
35 views

Sent Bitcoin to Bitcoin Core Wallet before it finished “syncing with network”

So I bought some bitcoins and sent it to my Bitcoin core wallet before it finished syncing with network, will the transactions come through once it finishing syncing or have I lost them?
0
votes
1answer
15 views

minimal transaction for gandi.net

I'm registering with a few different bitcoin sites. I notice that, at least according to older questions, paypal isn't generally accepted. Is there a simple way to buy a few US dollars worth of ...
-1
votes
1answer
20 views

Does nbitcoin framework internally uses blockchain to process transactions?

My concern is about miner's fee, who is taking that amount?Blockchain or nbitcoin
1
vote
0answers
20 views

What value stores can be exchanged for bitcoin purely pseudonymously?

What can I trade with bitcoin without having to give out private details like name and address? (Imagine I don't even have a name or address.) I'm looking for stores of value like gold or stocks. ...
0
votes
0answers
20 views

Does multibit HD still work offline and is it safe to connect to transfer funds?

I am new to the whole bitcoin situation and have some super noob questions. I watched this tutorial for creating a multibit coin wallet on a USB stick https://www.youtube.com/watch?v=2qmOM567BF4 . I ...
1
vote
1answer
26 views

Alt coins as Bitcoin sidechains

So I was reading this discussion today and came across this concept: Monero, Litecoin, Ethereum ... will be Bitcoin sidechains before long, and as there's no additional value to having ...
3
votes
1answer
42 views

Lightning network and lightweight clients

How will the lightning network handle lightweight clients? Do I understand it correctly that opening a payment channel require writing on the blockchain to protect against double-spend? The integrity ...
0
votes
0answers
12 views

How can I verify instant guarantee in BitGo on TestNet?

I'm testing instant guarantee verifying by this doc: https://www.bitgo.com/api/?shell#get-instant-guarantee I'm checking instant on wallet 2N8xcBSSJLdz5bFoYBPEwpgf2PPDT5CkunM and transaction ...
1
vote
3answers
82 views

Can there be a blockchain without mining?

This is a question about Blockchain in general, not about Bitcoin as a currency on top of Blockchain technology. Let's say I want to issue a vote on top of, lets say, multichain. I would issue an ...
1
vote
1answer
43 views

Does the bitcoin testnet3 network support Segwit and OP_CSV?

As far as I know, Segregated Witness and OP_CHECKSEQUENCEVERIFY are the last features needed to be able to fully implement a trustless bi-directional payment channel, from start to finish. (...
1
vote
2answers
66 views

Creating empty blocks vs creating full blocks

I've already read many different answers to this topic. Is it correct that the miner decides on his own if he includes any transactions in his block and how many (as long as the block size is <...
4
votes
0answers
35 views

What is special about a private blockchain based on proof of stake?

I recently came across a paper published in 1988 called "A quorum-based commit and termination protocol for distributed database systems". I could not read it because it is not free, but to me this ...
3
votes
1answer
27 views

Why did they have to expand the nonce value range?

My understanding is that at a certain point, once hardware passed the 4 GH/s level, the 4 billion possible values for the nonce became insufficient in bitcoin mining, because a good rig could exhaust ...
4
votes
0answers
23 views

70% of nodes accept Bloom filters, despite DoS attack vector?

Could someone explain why so many Bitcoin nodes allow Bloom filtering given that DoS attacks exist [1], [2] for such nodes? According to bitnodes.21.co, right now 3879 nodes out of the total of 5515 ...
0
votes
0answers
25 views

Help me: transaction [duplicate]

Good afternoon, I use Bitcoin Core v0.12.1 16 of July, I made a from 1GEkFLWAAH1cLbHkfyVSgmZfAg22ug57vh account to 12dSnA8NpE8mRgFp9LeVbh3XsyrVTNdtnX account (ID ...
1
vote
1answer
38 views

How to denouce a scam exchange?

I was scammed by an exchange called BitNake. It is referenced in the Bitcoin Wiki as a fast and secure exchange seeded in Germany. I could not find any negative comments on the web and decided to try ...
0
votes
0answers
22 views

End of Mining intention [duplicate]

If every block generated all 10 Minutes to validate a transaction, and the last bitcoin will generated in 2140. And there is no limitation of blocks.. Whats after 2140, because all miner have no ...
-1
votes
0answers
18 views

Loan Repayment using bitcoin

Can we use Blockchain wallet for a system where you can give a loan to your contacts and accept repayments from them with a defined interest rate?
-2
votes
0answers
14 views

i want to get back my 0.42 btc [closed]

today i login into my account. but it was not login due to invalid username password. i request for password. I received email from you at my email account. i opened it and reset password. then i ...
1
vote
1answer
34 views

Total # of miners?

Is there any way to find out the total no.of mining nodes in the Bitcoin network? In case of mining pools, the devices present in each pool.
0
votes
1answer
27 views

Configuring Windows Bitcoin Core Wallet for use on Tor

I use Bitcoin Core v0.12.1 (64bit) for Windows as my desktop wallet for transactions on the regular web. I am just getting set up to use Tor. I would like to configure Bitcoin Core for use on Tor as ...
-2
votes
0answers
37 views

What the f$%$% is going on [closed]

I was mining on minerGate overnight when suddenly this happened(picture given). Can anybody explain to me what the hell is going on!!]1
0
votes
0answers
10 views

partial signature (of P2SH) in Bitcore. howto?

Using pybitcointools, it is easy get partial signatures of a p2sh using the multisign function. Then, these can be communicated around to the several controllers of the p2sh address. Using bitcore, I ...
1
vote
3answers
50 views

Electric power efficiency - why is increases so fast

How were the Antminer hardware made to decrease electric power consumption by half with each new product, like at the current generation of S9? What are the projections to future efficiency that can ...
0
votes
4answers
35 views

Incentive and 51% attack

White paper: "The incentive may help encourage nodes to stay honest. If a greedy attacker is able to assemble more CPU power than all the honest nodes, he would have to choose between using it to ...
2
votes
4answers
179 views

If SHA256 produces an alphanumeric hash, how can a hash be “less than a certain value”?

I was under the impression that Bitcoin's method for validating a hash involved making sure the hash started with a pre-determined number of zeroes. However, after reading the docs here, I see the ...
-3
votes
0answers
26 views

I just send money but before i register in here what should i do! [closed]

Just register minutes ago and duno where the money is right now, because its not into my account, I send bitcoins just before i register in here!
0
votes
1answer
58 views

Ludicrous transaction fees from Coinbase?

I moved 0.16 BTC from my Coinbase online wallet to another one. I got 0.0017 BTC of transaction fees which looks a little bit too much. I was expecting an order of magnitude less, something like 0....
0
votes
1answer
28 views

Newbie question, bitcoind installation doubte

I am not an expert of linux systems but I want to learn how to use it on a secure way. I have an vps with ubuntu and I installed bitcoind with the root user. I read into a lot of sites that I should ...

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