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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15 views

Blocks were behind [on hold]

I had not ran bitcoin for a long time, started it up yesterday and it was going thru the process being behind, took about 8 hours to catch up but I still do not show any transactions. The last time I ...
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1answer
29 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
25 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
37 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
32 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
49 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
44 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
69 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
79 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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0answers
96 views

Sending BitCoins API [closed]

Long question short Looking for an alternative to a BitCoin Sending API, just like provided by BlockChain - Send API Scenario: A simple e-commerce like solution that accepts BitCoins from ...
0
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1answer
68 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
77 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
48 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 ...
0
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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. ...
0
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1answer
167 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
186 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
57 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.
6
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4answers
383 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 ...
0
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1answer
63 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 ...
1
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1answer
56 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 ...
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1answer
152 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 ...
0
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0answers
52 views

BTC China ruby api wrapper

I am trying to build simple BTC China client https://btcchina.com to get account balance for training and educational purposes. I know there is https://github.com/Lewis-Clayton/Kublai gem out there, ...
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2answers
97 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
112 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?
0
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1answer
65 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
76 views

Build Altcoin-qt, keep getting 'This application has request the runtime to terminate it in an unusual way' error

I successfully built my coin on my laptop using Qt4.8.6, but get this error when I try to solo mine it. I can solo mine, but the error pops up. If I click 'ok', it shuts the program down and I can't ...
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0answers
108 views

Building Altcoin, getting undefined reference to CTxDB error

I am trying to build an altcoin under Windows. It has compiled just fine under Linux. I installed all the dependencies, updated my path, and installed Qt for qmake. I am partially following the guide ...
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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
123 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
808 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
111 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
44 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 ...
0
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1answer
30 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
48 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
166 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
votes
2answers
471 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 ...
2
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0answers
138 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
48 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
155 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 ...
0
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1answer
61 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_
9
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2answers
1k 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
81 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 ...
1
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1answer
264 views

What is the maximum of receive addresses the default wallet can handle?

I guess there is no limit. But on tests, what is the maximum before the bitcoind start to slow down in a specific machine?
0
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0answers
54 views

Empty amount sent with bitcoind

i am usng JSON PHP to send money from my address to another one, He send the first time normally, tested with (0.002 BTC) And when i test second one, he send empty AMOUNT (0.0 BTC) and charge for ...
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2answers
88 views

Where to find cryptocoins current price

How can I find API (json data) for cryptocoins current ask/high/low/average price. Is there any website that provides that ticker information for all coins. For example BTC/LTC ticker info is ...
0
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1answer
86 views

Bitcoin client from command line without blockchain [duplicate]

Any bitcoin client used on linux plateform to send bitcoin from address to another one without using blockchain or full node like bitcoind ? Thank you
0
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0answers
30 views

Send bitcoin automatically without blockchain [duplicate]

How to send bitcoin from my address to another one without updating or using blockchain on Bitcoind ? I want create PHP Script that do it automatically when someone pay invoice and he will receive ...
1
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1answer
905 views

RPC server with bitcoin-qt and bitcoind has a different set of commands?

When running bitcoin-qt -server, I am able to run the getbalance command, and the help command shows many items: ~ > bitcoin-qt -regtest -server # Running in another shell ~ > bitcoin-cli ...
2
votes
1answer
189 views

Is Bitcoin a fully decentralized network, or how do clients connect to the network?

I read that Bitcoin is a fully decentralized network, but I don't understand how Bitcoin's client can connect to the network. I think that client must use some server for this action like other P2P ...
2
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1answer
50 views

Is it possible to create a system for 'shared wallets' on top of bitcoin?

Is it possible to build a system on top of bitcoin, where: Random people will deposit money in a wallet X. Nobody has access to that wallet. After a few months, those users will vote in other ...