A client is any application which allows a user to connect to the Bitcoin (or alternate) network. Alternately, "client" may refer to a non-standard user interface which interacts with the Bitcoin network through a standard client.

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where can I download the blockchain nightlies handled by tcatm?

I want to download the blockchain nightlies handled by tcatm, yet the site seems down. Is there any alternative site? Thank you
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21 views

Bitcoin core 64 bit has freezed

I downloaded bitcoin core 64 bit and it was synchronizing. I turn my laptop off and open the program again and now it frozen at " loading block index " . I have bitcoins on it. What should I do now ?
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20 views

Bitcoind writes complete wallet.dat regularly which is a problem, what can i do?

i have troubles with my system, using iotop i identified bitcoind as the source of problems. I am running bitcoind of bitcoin-0.10.0-linux32 and am using the RPC calls of bitcoind. My wallet file is ...
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0answers
20 views

It has took so long and my bitcoin core (64 bit) is still not synchronized [duplicate]

I am using bitcoin core (64 bit) wallet. I have funds on it and I have open it for almost 3 hours and it is still not synchronized. I have check the date and also my 4G internet runs fast but still ...
2
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1answer
25 views

sendrawtransaction without downloading blockchain

Is it possible to use sendrawtransaction without downloading the blockchain? Or will bitcoind reject the broadcast since it can't validate the inputs? If the client does block it by default, is there ...
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1answer
24 views

Uncaught exception 'Coinbase_ApiException' with message 'Status code 401'

I am using magento extension of coinbase bitcoin for my sandbox account. But whenever I am trying to place an order on my store I am getting following error : Fatal error: Uncaught exception ...
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1answer
21 views

Display missing parameters in cli help command on web page with JSONRPC

I am trying to get the entire contents of the "help" command to show up on a web page I am working on. Currently print_r($coin->help(); shows most of it, but all of the required parameters, except ...
3
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1answer
127 views

Why doesn't Bitcoin use a DHT for choosing peers?

Why does Bitcoin use a gossip protocol rather than a DHT for peer discovery? I believe that kademlia XOR distance helps shape the network topology so that peers are more evenly disturbed.
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4answers
92 views

How to get unspents for a specified bitcoin address?

I want to access unspent data of a specific bitcoin address. I am trying this command bitcoin-cli -regtest listunspent "some bitcoin address" But I am always getting an empty list. I am using local ...
2
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0answers
52 views

jsonRPCClient.php states its served a 401 error response

When I execute my php file from the command line I get this: <pre> PHP Warning: fopen(http://...@127.0.0.1:8332/): failed to open stream: HTTP request failed! HTTP/1.0 401 Authorization ...
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2answers
37 views

Receive unconfirmed transactions using Insight API

I am new to Insight API. I want to receive unconfirmed transaction that are being broadcast to confirm by a miner to add in a block. I am using Insight API using RPC client. How I can get ...
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2answers
91 views

Obelisk servers

Obelisk servers are implemented by several libraries like Pybitcointools and Libbitcoin's SX/BX tools; there also appears to be shared(?) repositories between Spesmilo and Libbitcoin. What is the ...
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1answer
50 views

Creating a virtual wallet to display balance in a store

I have a store that uses bitcoin as a payement. I want to make users deposit to their balance in the site, as I saw in many sites, a bitcoin address is generated for each user to deposit funds to ...
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1answer
44 views

Best Way to Get Latest Transactions

I'm trying to write a node that listens all the bitcoin transactions in real time. I'm considering two ways of doing this: The first one is to check mempools of other nodes periodically and the second ...
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1answer
233 views

Creating a raw transaction using Bitcoin Core v0.10.0 bitcoin-tx / createrawtransaction

I'm trying to create a raw transaction using Bitcoin Core v0.10.0 (on Windows 7 x64, and with txindex=1 optioned). Bitcoin Core v0.10.0 comes with a new Bitcoin-tx executable utility. The help menu ...
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2answers
61 views

How do I see what version of bitcoin core my wallet uses

I use the multibit wallet which I understand doesn't download the whole bitcoin core i.e. the entire block chain, but it must use the bitcoin core protocol right? So how do I see which version of the ...
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1answer
47 views

Move MultiBit from Mac to Windows

I'm an IT consultant in Australia and I'm pretty green when it comes to BitCoin and wallets and the like. I've been contacted by a client with a MacBook Pro that cannot be repaired and he is looking ...
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2answers
113 views

Wallets that support 40 byte message attachment via OP_RETURN? Desktop / Mobile?

I see that many new Bitcoin 2.0 apps are making use of the additional OP_RETURN parameter for attaching data. I see that max limit is 40 bytes or roughly 40 characters? My question now regarding ...
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1answer
153 views

Runaway exception on 0.9.3 Bitcoin client startup 64 bit Windows 7

After I install my Bitcoin client (0.9.3 64 bit on Win7) I can run it one time without problems. It won't start up a second time, though, and terminate with the following error: EXCEPTION: ...
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1answer
161 views

bitcoin-cli fails with auth error

I run it like the below. bitcoind -datadir=/Users/varunvb/Downloads -conf=/Users/varunvb/Downloads/bitcoin.conf -daemon When I run (Using the user name and password as in the config file) ...
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1answer
103 views

Bitcoind suspend when Synchronizing blocks

My bitcoind started synchronising blocks. The bitcoind version is 0.93. When the bitcoind found an orphan blocks in the synchronising process, it seems stop and did not work. the message from the log ...
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1answer
90 views

How can I use a vanity address as my main address

I obtained a vanity bitcoin address (1MonkeyQWbMzny7BNTA66W9wv6KaCFFAB7) along with its private key. I would like to be able to use this as my main address. Sites like BlockChain.info allow you to ...
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1answer
163 views

Sending bitcoins to same address

I am using the BitcoinJ API to create my wallet. When I create a transaction, I provide the change address to which change should be sent. For example: let there be 1 bitcoin at address A; then I ...
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2answers
50 views

Is there any software that allows me to make a single multi-recipient transaction?

I would like to do a payment to multiple addresses in the same transaction on a regular basis. The scenario is this: Collect addresses via QR or string (these may change on each occasion) Use all ...
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0answers
22 views

How do i transfer bitcoins from bitcoin qt to multi bit? [duplicate]

Im very new to this so forgive me. I downloaded bitcoin qt and after 16 hours there was no progress whatsoever with this 'blockchain' stuff. I bought some bitcoins to send to the bitcoin qt client. ...
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1answer
351 views

bitcoin-cli getbalance different from listunspent

I have probably misunderstood the meaning of bitcoind 'getbalance' command. I am using bitcoind in regtest mode. I am using imported multisig bitcoin watch-only addresses, which are the following: ...
2
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1answer
192 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 ...
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1answer
81 views

iPhone App for Bitcoin trading / transfering?

Is it any iPhone App that I can use to buy / sell / transfer easily Bitcoin? I want to be able to download from Apple's App Store.
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4answers
450 views

How to find a specific bitcoin address from all the addresses?

Recently, I found a site that show all the addresses in a huge list, divided in 904625697166532776746648320380374280100293470930272690489102837043110636675 pages. The site's link is ...
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1answer
70 views

Bitcoin cloud trading

Is there a trading bots that trades automatically and can also be hosted by the company that is providing the service? I've found BTCRobot and Butter Bot. Any reviews on the validity behind these ...
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1answer
67 views

Critical Section in Satoshi client

Can you please point me to a tutorial for an explanation of the specific "Critical section" implementation that is used in main.cpp. I would like to understand a bit better how does it work. I studied ...
2
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1answer
281 views

Why does the Bitcoin core client use so much CPU time while synching?

I have always noticed the huge increase in cpu usage when I opened my client for the first time in a few days. I was wonder what this is from? I would imagine verifying all of the signatures of the ...
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2answers
127 views

How is the previous transaction hash calculated?

Can anyone provide a clear example on how to calculate a previous transaction hash. Say i want to create a new transaction, i get that the hash is calculated by doubling sha256 a message m, but I'm ...
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2answers
135 views

What does it mean to have -1 confirmations?

I have -1 confirmations for an inbound transaction on my Electrum wallet. What does is it mean to have -1 confirmations?
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1answer
72 views

How does bitcoind find p2p hosts? [duplicate]

I read the bitcoin references but I can't find a description regarding how bitcoin clients find other host in the p2p network. Would you please tell me?
1
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1answer
45 views

blockchain - strange problem

I have Windows 7 and i’m using the bitcoin-qt client v0.8.6-beta. Last night i tried to open up the client – but there was a message that said i had some issues with the blockchain. Which is weird, i ...
2
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1answer
150 views

0 Active Connection on my-new-coin

I have compiled my-newcoin-qt and my-newcoind on different platforms (windows, Linux and Mac), with my coin specification based on litecoin. When I run my-newcoin-qt at the first time, I get no error ...
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1answer
1k views

How to make a CryptoCurrency (Using Scrypt pref.) in depth

Ive tried multiple google searches (Some even linking to this Q&A Site itself!) and cant find a proper guide. I know this probably wont be easy, but im really determined, and do know how to code ...
3
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1answer
132 views

How can I connect to bitcoin-qt client with public ip address

I used the bitcoin client but i want to connect to it using public ip adress not localhost. From that machine i could reach bitcoin using localhost but when I am using public ip address with the ...
2
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1answer
47 views

How are mutated transactions prevented from getting relayed?

Quoth Bitcoin release-notes-0.9.0.md: This release contains a few fixes for transaction ID (TXID) malleability issues: -nospendzeroconfchange command-line option, to avoid spending ...
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1answer
31 views

Optimising the inputs for a transaction

I have a list of unspent outputs. Let's say: 0.4 BTC, 0.6 BTC and 1.0 BTC. Now I want to create a new transaction for a 0.5 BTC. How I understand it, it would be best to take the 0.6 BTC output as ...
3
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1answer
54 views

How will the new Internet Neutrality Act affect Bitcoin?

How do you think the neutrality act that is being talked about as I write this post will affect the Bitcoin community. Not only in transactions, but mining, how will it affect Bitcoin economically ...
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2answers
197 views

Unable to establish connection to bitcoin using json and php

I'm newbie to bitcoins. Im trying to get the info, as much as I can. I'm trying to get the information by using getinfo() method that is mention in api documentation. The code i have tried is ...
8
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2answers
505 views

Why don't developers switch from bitcoin-qt to a cleaner implementation?

The "reference client" bitcoin-qt receives a lot of complaints from developers on the messy way it was coded. It seems to require a big overhead to learn, and a lot of time is being spent on ...
3
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0answers
157 views

BTCJam API 500 errors

I am currently trying to set up an application using the BTCJam api. I think the api could be very useful, but I have been unable to get it to work fully, and since support isn't responding, I thought ...
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1answer
55 views

How to transfer different cryptocoins from one daemon to another

How to transfer different cryptocoins from one daemon to another. I want to send currency from dogecoin to bitcoin, I think trading engine do such process. Can I implement such process across local ...
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2answers
181 views

How trade engine works? [closed]

How cryptocoin trade engine works? Is there any open source project available other than buttercoin. I want to build a simple trade engine in ruby on rails for cryptocoins. what are the essential ...
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1answer
68 views

Is there a way to chain calls in Bitcoin core console?

Is there a way to chain calls in Bitcoin core client console window like this validateaddress (getaccountaddress "") instead of getaccountaddress "" validateaddress _address from previous call_
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2answers
2k views

Can two private keys generate the same (public) Bitcoin address?

I know that private key is generated randomly by wallet. Is it possible that wallet generate the same address which is used in Bitcoin? In other words: Given two private keys ka ≠ kb, is it ...
0
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1answer
87 views

What was the first official BTC miner software?

I know that the first and official wallet is bitcoin-qt. This wallet has code here: https://github.com/bitcoin/bitcoin What was the first official miner software? I understand that bitcoin-qt never ...