All Questions

2
votes
1answer
102 views

How to add additional information to transaction?

I want to add some additional information to my specific transaction, so that I can send the additional information to blockchain.
0
votes
1answer
40 views

How to get started with a Bitcoin wallet [closed]

Where should I go to start a wallet? I have downloaded the TOR browser and got online at WEUSECOINS.COM. Is there another site, perhaps one with more information for beginners, that I should be ...
0
votes
2answers
67 views

Does the value of my Bitcoin fluctuate automatically?

If you own a small amount of Bitcoin (say,$10) does one have to "invest" it somewhere for it's value to change or will the $10 fluctuate by just sitting in one's wallet and one can see the value ...
1
vote
2answers
89 views

What / Who is the Bitcoin mining-power useful to?

I searched the internet to find out who (or what) was taking advantage of the result of mining but i couldn't find a clear and complete answer (and sources). I know Bitcoin miners decrypt hashes, ...
0
votes
0answers
25 views

How fast is the NXT blockchain growing in 2014?

Is there a place that where I can find out how fast the NXT blockchian is growing? I'm curious because its this year (2014) where a bunch of nxt features came into the scene and was wondering how one ...
0
votes
1answer
25 views

Determine which transaction spent a Transaction Output

I will explain my question through an example on the bitcoin testnet network. I am looking at the output at index 0 of this transaction: ...
0
votes
1answer
15 views

Where does one obtain the most widely accepted Bitcoin/Euro exchange rate?

I want use Bitcoin to make a purchase from a private seller in another country. The good which I want to purchase is priced in Euros, so I need a Bitcoin/Euro conversion rate which both of us must ...
3
votes
3answers
213 views

bitcoin mssql decimal/money storage size

What's the decimal storage requirement in ms sql for bitcoin? GAAP standard quotes decimal (13, 4) for money. Is decimal (13,8) preferred for bitcoin or something else?
0
votes
1answer
26 views

Blockchain.info, How to receive new transactions (not websocket)

I'm trying to build safe transaction-confirmation app and need to synchronize new not-processed transactions. For example I monitor address A and have processed last transaction B, how can I ask ...
0
votes
0answers
31 views

Blockchain.info Wallet API: How can I send bitcoin without transaction fee

I am using Blockchain.info Wallet API for sending bitcoin. According to the API document, transaction fee must be greater than default fee. I tried to put the fee was 0 but the setting was ignored. ...
0
votes
0answers
28 views

How safe is sending out transactions using unconfirmed inputs for a service?

I've been running into problems with a high-traffic hot wallet, where a single transaction would lock up any input for a block with the spendzeroconfchange disabled. Would it be safe for a service ...
7
votes
1answer
525 views

Why is Bitcoin defined as having 8 decimal places?

At the protocol level bitcoins don't actually exists, but rather base units (recently called “satoshis”). Bitcoins are defined as 108 base units, meaning that for a 50 BTC mining reward, you are ...
0
votes
1answer
22 views

Remove address from sequence in HD wallet

Is there a way to eject an address out of the sequence of an HD wallet? Lets say an address was used for a political donation to a regime in Namibia that may get international condemnation a few ...
1
vote
0answers
16 views

Bitcoin Historical Price API/Database

I have found many APIs and databases that exist for historical Bitcoin prices but they will only give you data for daily intervals or tick data. Is there an API / database that exists that will ...
0
votes
2answers
43 views

Can you buy bitcoins as a Canadian without a bank account?

So is it 100% true that one cannot but bitcoins with just a credit card BUT your purchase MUST be connected to a bank account? If it's supposed go be anonymous then why is the bank account needed? I ...
0
votes
1answer
28 views

PHP Checking privatekeys

I am setting up my site on a hosting (not a server, just a hosting) where i will accept payments of bitcoins and maybe other cryptos later, after a week or so, i want to "sweep" my wallets. In short: ...
2
votes
1answer
99 views

Why does Bitcoin charge per transaction?

The first time I heard about Bitcoin, someone told me that it's almost free to transfer bitcoins to other people. However, I found something called "cost per transaction." Why does the Bitcoin network ...
3
votes
3answers
67 views

Random numbers using blockchain

How are the block hashes generated? Are they trully 100% random (generated by hardware) or is it pseudo-random (generated by software)? Can i rely on it or any other blockchain data to make a 100% ...
2
votes
1answer
27 views

How do I query a remote bitcoin node like RPC?

I know how to query the blockchain stored on my machine programmatically using bitcoind commands. Is it possible to do the same on a public node? For example, is it possible to send “getblockcount” ...
0
votes
0answers
12 views

bitcoind importaddress balance

I am trying to do some tests using multisig transactions without importing the private key in bitcoind (watch only addresses). Bitcoind runs in regtest mode. These are the steps I have done: ...
0
votes
1answer
29 views

How do developing countries begin to adopt bitcoin?

If you're in, for example Congo, or Ecuador (or any other developing country) how do people there begin to adopt bitcoin? I mean the very first people, obviously things are easier once a, even small, ...
0
votes
1answer
58 views

If all block chain copies get deleted, what would happen?

What would happen if all block chain copies get deleted at one time? At first, all clients would try to get the block chain from other clients, right? But this would fail. Would the "network" then ...
2
votes
1answer
28 views

Is there a chart of all combined orderbooks?

I would like to view a chart where all bid/asks are combined from the various exchanges, instead of keeping multiple tabs open for each exchange. Is there a website that allows this kind of ...
-1
votes
0answers
34 views

Which is the historical context of Bitcoin?

I´m a student, that is in 10th grade and in this grade, as every year, are organizing a MUN (Model of United Nations). I am, as president, part of the committee of World Bank. I chose as first topic ...
-1
votes
0answers
26 views

where can I find a chart or data showing total Multibit dowloads?

I'm looking to see the total downloads for Multibit like what was in the Coindesk article earlier this year. Ideally I'd see them by month. Any sources out there?
1
vote
2answers
93 views

Should a casino manage its own Bitcoin wallet?

Let's say I wanted to start an online casino that accepts Bitcoins. Would it make sense to manage my own Bitcoin wallet for this site? Or would it make sense to just use a third-party service that ...
1
vote
0answers
26 views

Blockchain.info : “Insufficient Funds Available”

When I sent bitcoin to an address by using Blockchain.info API, I got "Insufficient Funds Available" error. Like below.. [API Request] ...
1
vote
0answers
36 views

Reliable method to convert national currency to bitcoin [duplicate]

I'm relatively new to Bitcoin and cryptocurrency so please excuse my newbie question. I'm looking for a reliable method to convert national currency (i.e. "normal" money) into Bitcoin. A quick ...
0
votes
0answers
23 views

How to index the UTXO set efficiently?

I haven't been able to find information on how to efficiently index UTXOs. Can you explain or point me to some resources? Update: Btw, I understand completely that the notion of address balance is ...
-2
votes
0answers
26 views

Lost Transaction

I have a transaction being sent to: 1FWFPJFd5ZbV5nQ44HCSbHpmXx16MzJUiE It started showing as unspent and unspendable and has now disappared. What went wrong. It was being sent to a multibit ...
1
vote
0answers
23 views

Pros/Cons/Limitations of Mnemonic Phrases - BIP39

BIP39 mnemonic phrases replace considerations about how to store one private key, with considerations about how to store the seed to a series of private keys. The idea is that the private keys are ...
1
vote
1answer
32 views

How to get the number of the confirmed transactions from Bitcoin QT Rpc

We are building a generic wrapper around Bitcoin-Qt. I wonder if there is way to get the information about the confirmation count of a transaction from a Bitcoin-QT having an empty wallet using the ...
2
votes
1answer
175 views

Official or default Bitcoin wallet for Android

I'm new to cryptocurrencies, and I noticed that both Litecoin and Dogecoin have official wallet apps for Android. Does Bitcoin similarly have an official Android wallet app? If not, is there a ...
1
vote
2answers
103 views

Will more hashes per second increase bitcoins per hash per second?

I read this article: We have paid 0.034 BTC for the 10 GH/s ... Yesterday we have received our first daily payout and it was exactly 0.00041279 BTC ... Doing a quick calculation has shown that ...
0
votes
1answer
35 views

Public stellard API server

I'm writing a Stellar application. I'm looking to use the API provided by stellard without running a copy of it myself. Is there a public API server for Stellar?
1
vote
2answers
78 views

How much bitcoin is 'lost', on average? [duplicate]

As the title of this question states, how much bitcoin is 'lost' (the private keys are not stored by any individual, and so will theoretically never be spent again)? I'd be looking for a percentage ...
0
votes
1answer
18 views

Bitcoind transactions in regtest mode always fail with -25 error

I have a problem trying to make a transaction using bitcoind/bitcoin-cli in regtest mode (I do not know if it works in other modes). bitcoin-cli -regtest createrawtransaction '[{"txid" : ...
0
votes
1answer
47 views

How can I read chainstate database?

1) What is the format of the LevelDB databases stored in the database directory? I know there are some custom blockchain parsing libraries, such as this one, but I'm wondering if I can just do a read ...
1
vote
0answers
30 views

How do I obtain the “Private Key” from my Armory Paper Backup

1) My laptop with Armory and bitcoin has been stolen. However, I have a Paper Backup - which gives: Wallet Version / Wallet ID / Wallet Name / Backup Type / Root Key (72 letters) - but NO "Chain ...
1
vote
3answers
37 views

Running bitcoind getaccountaddress

When I run bitcoind getaccountaddress I get this error error: {"code":-1,"message":"getaccountaddress \"account\"\n\nReturns the current Bitcoin address for receiving payments to this ...
2
votes
1answer
182 views

What would cause the price of Bitcoin to flatline for several hours on Bitstamp?

Last night I observed the following flatline of BTC/USD prices for several hours on Bitstamp: What would cause this ?
0
votes
1answer
55 views

Bitcoinj always gets 0 balance

I am trying to use Bitcoinj for my app. I am using regtest mode. I have a balance of 42 BTC on my account: bitcoin-cli -regtest getbalance mirko3 -> 42.00000000 My code follows: public class ...
-1
votes
1answer
43 views

How do I import private keys en mass from a text file?

How do I import private keys en mass from a text file? They are in Wallet Import Format, e.g. 5HueCGU8rMjxEXxiPuD5BDku4MkFqeZyd4dZ1jvhTVqvbTLvyTJ. Would there be any limitations to the number of keys ...
1
vote
1answer
30 views

Key exported from BitcoinJ is different from the key shown by bitcoind

I am quite new to Bitcoin. I am trying to use Bitcoinj with regtest mode. I have created the following application: public class TestBitcoinj { private final static BigInteger ONE = new ...
0
votes
0answers
14 views

How Satoshi managed to mine so much bitcoins beign the first user of the system? [duplicate]

I'm just learning Bitcoin and if I understand it's conception properly, mining of bitcoins means validation of transactions by computing hash which should satisfy some preset condition. In other ...
1
vote
1answer
95 views

Is multi-PPS the correct solution to the mining centralization problem?

See this post. Meni believes that this could be the correct solution to the mining pool centralization problem, and that are no known drawbacks. There is some work that needs to be done to write, test ...
0
votes
1answer
46 views

Create OP_RETURN tx with Bitcoinjs-lib

I know how to create a basic TX: var bitcoin = require('bitcoinjs-lib') var tx = new bitcoin.Transaction() // Add the input (who is paying) of the form [previous transaction hash, index of the ...
0
votes
1answer
25 views

using blockchain.info api_code

I make a JSON call to https://blockchain.info/tobtc?currency=USD&value=1 This is a free api with a request limit. I have just received my api_code via email. This is blockchain.info's example ...
0
votes
1answer
19 views

Blockchain.info keeps sending wallet backups

Blockchain.info is sending my wallet backups over and over again; is this someone trying to hack my wallet or something else? I haven't done anything on my account, no settings changed et cetera.
0
votes
2answers
75 views

Difference between a bitcoin wallet and the blockchain

As the title said, what is the difference between the bitcoin wallet and the bitcoin core, do i have to install both of them to work? Can I just have a bitcoin wallet?

15 30 50 per page