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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publicly available json-rpc node for bitcoin-cli connection

There is a service provided by blockchain.info described on json_rpc_api page. More or less it describes the API that user can use to access their blockchain similar way as using bitcoin-cli to own ...
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51 views

Creating a Bitcoin site

My question is this: Lets say I wanted to create a bitcoin site, where users register and can deposit bitcoins into their account. should i use my MPK to generate infinite addresses, so after a user ...
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bitcoind and bitcoin-cli 'unrecognized', how can I access them from command line?

I have downloaded and installed the precompiled Bitcoin Core OS-X (also successfully synchronized). Every tutorial I have seen then directs one to begin using the executables bitcoind and ...
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1answer
9 views

How can I get the Fee involved in a Bitcoin transaction using RPC client (bitcoin-cli)?

I performed a bitcoin payment in the testnet, here is what I get when I execute bitcoin-cli gettransaction "11b8d5f89793e83e9e10b7ee51fa1b3445f6029f7d7efe4c82b3b261ec513a0e", as you can see the info ...
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1answer
27 views

Can a client leave its mark on the blockchain?

Would it be possible for a client (eg the core client) to leave its mark in the form of META data on the blockchain or even in the mempool so that we know that this client was used to create or send ...
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1answer
49 views

Why does an exchange of bitcoin transaction not need to be over a secure connection?

I apologise for my rather ignorant question and maybe my question is completely wrong. But my impression about one of the advantages of bitcoin (digital currencies) is that when a customer pays a ...
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1answer
43 views

How can one figure out what version of Bitcoin-Core is used most?

Where can one find statistics on how many nodes are running older Bitcoin Core versions or alternative clients?
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19 views

How can I start to mine? [duplicate]

I want to begin to mine on a computer, I know that it is not efficient but I want to do some experiments and tests for a project. I tried all programs in the list ...
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1answer
15 views

how to capture only one part of the getrawtransaction

I want to capture just one part of what Getrawtransaction returns, but it returns an array within an array that i can't seem to process. I.e when $txid = ...
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28 views

listtransactions returning duplicate transactions with category “Send” & “Received” both

I am facing serious problem in listtransactions call. I am getting duplicate transactions with "send" and "Received" category. For I have sent some bitcoins from 31zeoskE8zeyQARFEVzwJzsp7GQpLn5zhF to ...
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1answer
38 views

Why new public key for every new request?

I created Bitcoin accounts using different clients but all clients I tried prompt for new public key for each request. My question is shouldn't be the public key one's identity which one should be ...
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30 views

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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28 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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26 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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1answer
39 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
43 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
27 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 ...
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1answer
171 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
114 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 ...
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79 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
59 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
121 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
74 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
57 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
382 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
70 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
53 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
131 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
183 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
224 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
106 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
96 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
223 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
51 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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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
470 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
196 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
90 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
505 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
76 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
73 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
351 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 ...
2
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2answers
150 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
156 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
76 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
46 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
157 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 ...
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1answer
153 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 ...
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1answer
48 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 ...