bitcoind is the command-line interface for Bitcoin. It stands for "Bitcoin Daemon" where a daemon is any computer process which runs in the background ("service" in Windows terminology). bitcoind connects to the Bitcoin network and passes transactions, updates the block chain, etc.

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bitcoin compile error on CentOS 6.6: ‘SIZE_MAX’ was not declared in this scope

I am trying to run a bitcoind instance (branch 0.9 from git repository) on CentOS 6.6 following this guide but I get this error when building LevelDB: Building LevelDB ... make[3]: Entering directory ...
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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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57 views

Bitcoin how to get X value from Y

How to get X value from Y? ECDSA x,y coordinate validity verification doesn't seem to work X = 0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 Python code, p = ...
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2answers
19 views

Ubuntu - Show active connections?

How can I see how many active connections there are on Linux?
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22 views

How to get receiving transaction information from bitcoind (bitcoin server)

I installed bitcoind on a vps and generated an address I sent some bitcoins to from Blockchain.info wallet. One day later, I still don't see any info about it in bitcoind while there are now 75 ...
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Connecting to a bitcoind in “-regtest daemon” mode remotely from another node (e.g. BitCoinJ)

Anyone knows how to connect to (or even possible) a remote "-regtest" server? I have managed to setup the -regtest daemon, but still trying to figure out how to connect to it using BitCoinJ client. ...
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Trying to restart bitcoind when it dies

I am trying to have Monit monitor my bitcoind process because it crashes a lot ever since the spamming has begun. I have this in my monitrc file: check process bitcoind with pidfile ...
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51 views

Broadcasting an OP_RETURN transaction

I am facing two problems below, First is that I am trying to broadcast transaction which have OP_RETURN but blockchain.info continuously rejecting it, though I have broadcast it using bitcoind. ...
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11 views

Vanitygen Rekey_max

The file 'vanitygen.c' has a constant "BN_ULONG rekey_max". I suppose it denotes the value until which vanitygen keeps using the same RNG seed? If the value is lowered to about, say 100K, will it ...
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39 views

Do the keys that are derived from a BIP-32 HD wallet depend on an initial seed?

I did not understand the concept of a seed in BIP0032 that well. Would you mind telling me do the keys that are derived from a key tree of Hierarchical Deterministic Wallet (HDW) depend on a root ...
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Need help with bitcoind “ zapwallettxes ” routine

It all started when I tried to make a couple of payments via bitcoin. The transactions just would not confirm. After doing some reading I saw that " zapwallettxes " would supposedly dump the ...
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27 views

Does bitcoind accept batch RPC calls?

Am currently sending RPC calls to bitcoind in Python3 in series using JSON: import json, requests def pull(command, foo): headers = {'content-type': 'application/json'} payload = ...
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17 views

How to use bitcoind with CUDA-ready box?

I am not asking for mining (which is all the information I could find on the net). I am asking for the regular bitcoind daemon, looking for having a full node with a reasonable high performance per ...
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1answer
44 views

Are there any Python modules that decode raw transaction data?

I'm currently doing RPC calls to bitcoin-cli within python to get raw block data: bitcoin-cli getblock BLOCKHASH False I've already written a function that cuts off the block header and splits the ...
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1answer
51 views

what is the best software based solution to secure the private key in Bitcoin

Would you mind telling me what is the best introduced approach to secure the private key in the wallet and a transaction which is done using Bitcoin? I do not want to use a separate hardware, I am ...
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16 views

Command to get the last block received in Bitcoind

Is there a Command to get the last block received in Bitcoind ? I'm interested in the DateTime it was received to the wallet
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49 views

Does an OP_RETURN script always need another output within the transaction?

I was reading this: Explanation of what an OP_RETURN transaction looks like and I wondered if the second output "value" : 0.00200000, was at all necessary. Can I just have a OP_RETURN with a 0 output ...
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2answers
54 views

Possible to speed up reindex?

I just reindexed a node that was already synced (in order to enable txindex); it took around 9 hours. It's on a pretty good system: 16G RAM, i7 with 4 physical cores. Storage is a weak point, with ...
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96 views

How does the bitcoin network recover in case of a hash collision in the block hash?

A Bitcoin client has to download the whole blockchain from the P2P network in order to become a full node. A full node is able to determine, if a transaction in the network is valid or not. To ...
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168 views

How to migrate wallet from namecoin to namecore?

Today I updated namecoin by building the new "namecore" reimplementation but when starting namecoind I got this message: Error opening block database. Do you want to rebuild the block database now? ...
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17 views

Node doesn't “printtoconsole” as prescribed?

I've written a script that shall start 6 nodes with -printtoconsole simultaneously on regtest but somehow after executing ./script.sh, each time, all nodes start ("Bitcoin server starting") except ...
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24 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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43 views

which transactions does bitcoind validate?

which types of transactions does bitcoind v0.10 perform checksig validation on? blockchain transactions belonging to a wallet with known private key blockchain transactions belonging to ...
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31 views

how do I send my imported wallet on electrum

I have been able to transfer my bitcoin to electrum but am facing hard time to pay it or send my coins. A form appear and I fill out and there is only two option to choose to click create unsigned ...
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33 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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How to save your bitcoins to avoid gambling [closed]

I am a bit addicted to gambling. Whenever I receive any amount in my blockchain wallet, I play on it and always lost it. Suggest some ways to save and avoid gambling.
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49 views

watch-only wallet with bitcoin-cli

i'm trying to see all tx hashes and the balance for an address i don't own: $ bitcoin-cli importaddress 1M43pksKTGpBd8J8XzjStjgnX5vie1kpYA $ # wait 5 minutes while bitcoind presumably scans all txs $ ...
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50 views

Transaction broadcasted to the Bitcoin network but not in my mempool

I use armoryd (0.93.1) to send transactions in the testnet Bitcoin network with the three calls: 1. createustxtoaddress 2. signasciitransaction 3. sendasciitransaction The calls are all successfull, ...
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How to allocate hash power to an instance of bitcoind?

I'm not sure if those questions were asked this way before but ...: Is it possible to allocate CPU resources/hash power to an instance of bitcoind run on regtest?If yes, how? Assuming I'm going to ...
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44 views

bitcoind (JSON-RPC) returned HTTP 403 error, i don't know why

I set up bitcoind in Ubuntu 14.04 and I requested "getinfo", but returned HTTP 403 error "FORBIDDEN". I don't know why... The environment is below.. ・Ubuntu is installed in Virtualbox and bitcoind ...
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1answer
16 views

Automatic savings account using 2 wallets?

Sorry if this has already been asked; Stack Exchange didn't have this exact question in the "related" field. Let's say I have two bitcoin wallets. Somebody sends wallet 1 a transaction of 0.5 BTC. ...
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17 views

How to obtain Block number of transaction?

Is there any function in bitcoind which when given the transaction(CTransaction& tx)/ transaction hash, returns its block number ?
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61 views

Will 8 decimal places really be feasible in the future?

I had a thought.. Given that block mining rewards halve every 4 years and eventually disappear, miners' incentives to continue mining will be transaction fees. The standard "priority" transaction fee ...
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37 views

create/sign/send raw transaction from specific Wallet account

I've been playing with the createrawtransaction, signrawtransaction, and sendrawtransaction Bitcoin calls. Let's say there are two accounts in my Wallet: Account1 and the default "" account. Let's ...
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35 views

The setup steps for generating bitcoin addresses programmatically and checking for payments with walletnotify

I have read this question and done some investigation, and I want to make sure I have some of this right. If I have a server somewhere where I can install bit coin (I'm thinking bitcoin-qt on ...
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23 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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39 views

How do I find out what block a transaction is in?

I'm trying to do research on the age of transaction outputs at the time they are spent. I'm running bitcoind on my computer. I have transactions indexed with txindex=1. I want to take a given TXIN and ...
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21 views

Bitcoind get unique newaddress

Hello all i dont know why but always getnewaddress give me many time the same address I use JSON RPC $server->getnewaddress() and i have encrypt wallet What is the good solution for get unique ...
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1answer
25 views

Authentication and key distribution in bitcoin

After going through the bitcoin protocol documentation it is still unclear to me how the bitcoin client is authenticated. Where can I find an overview of what the client sends and receives on the wire ...
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47 views

Bootstrap.dat incorrect or no genesis block found

Hi all i need to add bootstrap.dat after downloading i start bitcoind with -loadblock but not work i have error Incorrect or no genesis block found. Wrong datadir for network? I start bitcoin with ...
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74 views

Problem with sendrawtransaction

When I use bitcoin-cli sendrawtransaction and only get -25 errors. I have tried to push the transaction using different blockchain explorer sites, but that didn't work. I have tried: ...
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49 views

how to send money using json-rpc in bitcoin-cli for php?

$bitcoin->sendfrom($this->session->userdata('account'), $_POST['address'], number_format($_POST['amount'], 8)); but this isn't working. i got everything via json-rpc. but can't send or move ...
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How to know if bitcoind synced?

I installed the bitcoind and started it as daemon. After 10hours I've tried "du -h" ubuntu@ip-172-31-37-93:~/.bitcoin$ du -h 16K ./database 59M ./blocks/index 29G ./blocks 646M ...
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45 views

What values should be initially assigned to Checkpoints for a new Genesis block?

I have created a new Genesis block. What values should be assigned to these fields? namespace Checkpoints { typedef std::map<int, uint256> MapCheckpoints; struct CCheckpointData { const ...
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59 views

how to calculate transaction bytes of a x BTC? x=0.2

i have read : How to calculate transaction size before sending but i will not understand what are in and out. as describe in this link in=40 and out=16 what does it mean??? i will send only one ...
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23 views

How to reduce Proof of Work in bitcoind?

I am trying to create a new genesis block. But it is taking too long to compute (still running). How do I reduce ProofOfWork needed ? Is it this line that I have to modify ? chainparams.cpp#L117 ...
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what is the transaction fee 1BTC of 0.2BTC? [duplicate]

i have 1 BTC. i want to send 0.2 BTC to other address. what is the transaction fee for that? can any one explain the transaction fee of 0.2 BTC?
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What is the algorithm behind multisignature address?

I know you can create a multisignature address with the command: bitcoind createmultisig 2 ["pubkey1", "pubkey2", "pubkey3"] As described here: https://gist.github.com/gavinandresen/3966071 This ...
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61 views

Building bitcoind from modified “selfish” code - possible? how?

For a long time I've been trying to find out ways for running a "selfish mine" algorithm on bitcoind's regtest mode. Now I'm wondering if my plan is feasible, at all!? So I'll just outline my ...
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59 views

Rise difficulty in code, still no changes after rebuild

I'm playing around with the code and tried to adjust difficulty by changing code from bnProofOfWorkLimit = ~uint256(0) >> 1 to bnProofOfWorkLimit = ~uint256(0) >> 20 inside code block ...