All Questions

0
votes
1answer
3 views

rpcallowip=192.168.0.* ?? invalid configuration

I recently downloaded bitcoin from github and changed the settings to allow for rpc. This is how I have it: rpcallowip=192.168.0.* Seems like this does not work anymore. However when running ...
0
votes
0answers
12 views

How to integrate a Bitcoin wallet service in my website

I'm a new web programmer and I'm building a website if a Member sign-up he get a wallet, and I want to make this website like a bank .... so when he registers a wallet he can send bitcoin to the ...
0
votes
1answer
27 views

What is the order of block hashes in block-locator array?

I have to compose a "getblocks" command found in https://en.bitcoin.it/wiki/Protocol_specification#getblocks The "getblocks" command contains the "block locator hashes". In essence, I inform a remote ...
2
votes
0answers
23 views

Transaction was rejected - Bitcoin QT, recovered wallet.dat

I recently installed a new version of Windows on a new HDD, but I'm having problems getting my old wallet.dat to work. Here's what I've done: Install latest Bitcoin Core. Copied over the blocks and ...
0
votes
1answer
21 views

OP_RETURN transaction doesn't go to the blockchain

I created transaction with OP_RETURN adding some information. Even though transaction hash created successfully, the transaction doesn't go to blockchain properly. Could you please help me to do this ...
0
votes
1answer
18 views

How does a blockchain store any data?

I read here that since Bitcoin is a networked ledger, it is a good way to back up data. I would like to know two things: How does a blockchain store 'any' data? I would like to know more about a ...
0
votes
1answer
9 views

java.lang.NoClassDefFoundError: org/spongycastle/util/encoders/Hex in Java when dealing with Bitcoin addresses

I have a private key bigInt of type bigInteger and I would like to generate the address corresponding to this private key. I implemented the following function public String get_address () { Address ...
0
votes
0answers
6 views

How do I join a NXT mining forging pool? And how do I register for payouts from the pool?

I found the following pool: http://pool.nxtcrypto.org/howto.html But I'm a bit unclear on these instructions: To claim your earnings, simply send an AM (can be empty or put whatever you want in ...
0
votes
0answers
9 views

rpcminer-cuda.exe, slush not accepting, is it creating valid hashes?

I got slush to accept a share from a while CPU mining using GUIminer. I then tried it with rpcminer-cuda.exe, and never got any accepted shares (I'm talking 130 MH/s); also, I didn't get any errors. ...
0
votes
2answers
32 views

Arbitrage in Bitcoin exchanges

How efficient is the bitcoin market? I am confused after comparing buy prices in exchanges operating in different currencies. For instance, I see that 1 BTC amounts to 347 USD at the moment at one ...
-3
votes
1answer
21 views

GPU mining not working. help

I have Hp pavilion laptop with built in switchable graphic. (AMD 6XXXM HD cart). the problem is i cant use it for mining. I tried the coinminer and cgminer but it wont work. Any body know how to fix ...
1
vote
1answer
16 views

How are transactions broadcast to the rest of the network?

If a person sends a transaction to another person, and Bitcoin is a peer-to-peer application, how will the transaction get to the rest of the Bitcoin community? How does everyone have the same ...
0
votes
2answers
35 views

How are transactions secured?

I'm a programmer and want to get to know more about encryption and how Bitcoin works, but there is not much on the web describing how all this code works. It would help if there was some visual way to ...
0
votes
0answers
12 views

How to store 30kb file using Decentralized Blockchain Data Storage on NXT (nxtcoin) by attach messages?

I'm curious to how would one store a 30kb file on the NXT blockchain since the NXT protocol can attach a 1000byte message. My test scenario is storing a 30kb midi file on the nxt blockchain and then ...
0
votes
1answer
14 views

Bitcoin transaction priority calculation

From the Bitcoin wiki page on transaction fees: Transaction priority is calculated as a value-weighted sum of input age, divided by transaction size in bytes: priority = ...
0
votes
2answers
27 views

Are Bitcoin fees optional?

I was making a multisig account in coinb.in. Then I tried to make a transaction (spend funds). At the bottom there was a box for writing the fee. What fee? I thought bitcoin sending was free! Beside ...
0
votes
0answers
10 views

PrimeTime Intraday Volatility Extrapolation

I found this indicator on mql5.com called PrimeTime Intraday Volatility Extrapolator. I would like to apply this idea to Bitcoin. How do you think it has been done? (without hacking it) Do you think ...
0
votes
1answer
21 views

BIP38 on multisig? Does it work?

I was making a multisig account with 3 of my Bitcoin addresses. The multisig account needs 2 of 3 private key to spend the Bitcoins in there. Then, I came up with an idea that nobody on the internet ...
0
votes
0answers
8 views

Ubuntu 14 LTS with SX tools installation issues

I'm trying to install the SX (http://SX.dyne.org) tools using Ubuntu 14 LTS following the installation instructions (http://sx.dyne.org/introduction.html#installation). I use wget to download the ...
2
votes
1answer
14 views

Difference between Outpoint structure returned from Blockchain.info and what is in the Protocol Specification

if you follow this link, you will see a specific bitcoin address. If you look closely at the prev_out field, it is not an outpoint structure. Inside of the protocol specification under transactions, ...
1
vote
2answers
48 views

Altering a block after generating it

Once a miner has found a block, how easy it is for him to add or remove a tx included in that very block? Would he have to solve the modified block from the scratch or is there a point he can resume ...
0
votes
0answers
18 views

How can I mine ALT SHA-256 coins using a Bitmain S4?

The bitmain S4 does 2TH/s out of the box with no overclocking. For many alt SHA-256 coins, this can be 10% - 50% of the entire network hashing power, which would allow us to gain alt coins quickly, ...
1
vote
1answer
25 views

avoid rounding errors in javascript with bigdecimal?

a user submits a buy request: 0.0104 BTC at a rate of 345.92 EUR config: var mode = RoundingMode.HALF_EVEN(); var satoshi = new BigDecimal("100000000"); user input: var btc_b = new ...
0
votes
0answers
30 views

Can I double encrypt my multisig wallet?

I was doing some research about how transactions work. I found that if I learned what multisignature transactions are, I would learn how a transaction works (rawtransaction, sign, verify...). I ...
0
votes
2answers
19 views

Block Chain API for BTC transactions

I want to fetch transactions for an address from the following api: https://blockchain.info/address/$btc_address?format=json The thing is understanding the json returned from the api, I don't ...
1
vote
1answer
40 views

How to verify ECDSA of a sample litecoin tx using pycoin?

I'm using the litecoin testnet network for testing. I have a UTXO at 053baee857adfdc16959e9dbc9618e0e935f0a1e51e226e651fcd67242f1f462 with a vout of 0. I make a raw transaction sending the coins to ...
4
votes
2answers
90 views

Why is Python popular in Bitcoin projects?

When checking out open source projects related to Bitcoin, I see that many are written in, or make a large use of, Python language. I mostly use Ruby and have little experience in Python; so, I would ...
4
votes
1answer
48 views

What are 'pegged' side chains are and how they will be useful for Bitcoin?

What seems to be a very important paper was released this past week (http://www.blockstream.com/sidechains.pdf). It centers around the idea of 'pegged' side chains, and being able to move coins from ...
2
votes
1answer
32 views

Can side chains or “pegged” chains negatively affect the security of Bitcoin?

Regarding the concept of side chains or "pegged" chains which has been discussed since as early as 2011 and explored in this white paper, how can these negatively affect the security of Bitcoin? ...
1
vote
2answers
42 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 ...
1
vote
1answer
40 views

C++ code for traverse though all the blocks in blockchain?

In my project for one particular functionality, I want to traverse through all the Transactions. For that purpose I want to traverse through all the blocks in blockchain.
1
vote
1answer
17 views

In BitcoinJ, what is the purpose of Peer?

In BitcoinJ, there is PeerGroup and Peer. I understand there are differences such as one is related to a group of peers while other is related to a single peer. When should I use which construct? ...
2
votes
1answer
33 views

Bitcoind transaction data verification

I find myself a victim of either my poor googling skills, or the lack of detail in the bitcoind docs. I have a walletNotify script running on a full node that whenever a transaction to / from my ...
3
votes
1answer
23 views

How to generate a public key from a private key using Elliptic Curve Digital Signature Algorithm

I'm trying to understand the graphical basis that underlies the discreet logarithmic Elliptic Curve Digital Signature Algorithm (ECDSA) introduced in Chapter 4 of "Mastering Bitcoin" by Andreas ...
0
votes
0answers
14 views

Darkcoin centralisation?

Darkcoin is supposedly completely anonymous. How does this work without any centralisation? Is there one person with all the transactions and only they mine?
1
vote
0answers
17 views

Bitcoin Escrow API [on hold]

I have an e-commerce website. In my website there are two types of registered users: Seller (They place an advertisement to sell there product [example:house]) Buyer (Want to buy house of seller ...
1
vote
0answers
8 views

Generate Bitcoin addresses using a Master Key from Armory wallet

Is it possible to generate Bitcoin addresses using a Master Key from a Armory wallet with PHP? I don't want to use Electrum Master Key as Armory has a lot more features that come in handy often.
-1
votes
0answers
24 views

Primary lesson about usage and working of bitcoins [on hold]

I was totally unaware about bitcoin.One month back I was surfing on internet and came through a bitcoin site.In that site there were instructions to create bitcoin address to earn bitcoins.I followed ...
-4
votes
0answers
45 views

Mine BTC = VIRUS [on hold]

Hello I have set up a very nice bitcoin mine place. With all the component and wallet, pool and so on. But the software was also important so I downloaded cgmine. It turned out that it was a virus ...
0
votes
0answers
16 views

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

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
votes
1answer
32 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: ...
0
votes
1answer
18 views

Decode blocks received and Store in another file for analyzing

I am working on a bitcoin research project. I want to decode receiving blocks from the block chain and store decoded data in a separate file for analyzing purposes. For this purpose I digs the ...
0
votes
1answer
16 views

Why is the scriptPubKey required when using signrawtransaction?

The signrawtransaction rpc method calls for the following use: signrawtransaction "hexstring" ( [{"txid":"id","vout":n,"scriptPubKey":"hex","redeemScript":"hex"},...] ["privatekey1",...] sighashtype ...
3
votes
1answer
38 views

Can there be more than one result of decoding a raw transaction?

I was looking in rpcrawtransaction.cpp and came across the signrawtransaction rpc method. While reading through this method, I thought these lines seemed strange: vector<CTransaction> ...
0
votes
0answers
27 views

How does the core client decide which UTXOs to spend?

If a core client has several UTXOs to spend when it is prompted to make a transaction, what logic does it follow to choose which UTXOs it spends? Is it oldest/newest first? Maybe prioritized by ...
1
vote
1answer
20 views

JSON RPC calls for Armory wallet

I'm trying to access an armory wallet via RPCs. For instance using the procedure listreceivedbyaddress should ideally return all of the addresses in my Armory wallet. However, when I run this from my ...
0
votes
1answer
31 views

Will 64-bit miners work on 32-bit machines?

I want to distribute some miners, but I prefer not to distribute 2 versions of everything (32-bit and 64-bit). According to Microsoft, most 32-bit programs run on 64-bit systems. I'm not concerned ...
1
vote
1answer
32 views

BIP38 or Brain wallet?

I have seen many videos about paper wallets and different ways to store BTC. And I have choose to store using a cold wallet (paper wallet). But I am not sure what option I should choose: a normal ...
1
vote
1answer
16 views

Bitcoin RPC getbalance of address I sent coins to on regtest

Here is my terminal session: $ echo $address mvt7M16caMH1xoJyfWU5orjArfq97jhZ7k $ bitcoin-cli -regtest getbalance 5899.99990000 $ bitcoin-cli -regtest sendtoaddress $address 10.0 ...
3
votes
1answer
119 views

What is the alt stack?

I noticed in the bitcoin wiki script page (https://en.bitcoin.it/wiki/Script) that there were two opcodes named: OP_TOALTSTACK OP_FROMALTSTACK It looks like there is another stack that can be used ...

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