0
votes
0answers
4 views

Mastercoin API - what to use?

I am interested in communicating with the Mastercoin network through an API to control various assets. In Bitcoin, I would run the Bitcoin daemon and use the documented API. For Mastercoin, I'm ...
0
votes
0answers
6 views

java.lang.NoClassDefFoundError: Could not initialize class com.google.bitcoin.core.Block when dealing with Bitcoin address

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
1answer
20 views

Bitcoin GetBlockWork() function

The implementation of GetBlockWork() in the bitcoin v0.9.3 source (https://github.com/bitcoin/bitcoin/blob/v0.9.3/src/main.h#L815-L822) seems strange to me. The code is given below for convenience. ...
0
votes
1answer
18 views

Transaction id length

Do all bitcoin transaction ids (hashes) have the same length? I guess it's defined somewhere here: https://en.bitcoin.it/wiki/Protocol_specification but still I couldn't find it.
1
vote
0answers
28 views

How do I create a new genesis block for an altcoin?

I'm trying to clone the Blackcoin sourcecode just for the hell of it but I can't seem to generate a genesis block. I can do it on normal coins, but not here. The Blackcoin developers seem to have ...
-3
votes
0answers
28 views

need advice for building bitcoin miner from scratch [on hold]

Ok so I've been studying bitcoin for a while now and would like to start up my own rig. I know it's pointless now to mine bitcoin because it's not worth it but I'd like to learn for fun and start with ...
-2
votes
1answer
27 views

i would like to know how long it will take me to mine 1 bitcoin with a 12 th/s mining rig [duplicate]

I am going to start mining bitcoin. I plan to use 6 antminer s4. that would give me 12 th/s. with this set up how long would it take me to mine one bitcoin?
-1
votes
1answer
25 views

How do I actually pay

How do I get USD to an exchange to purchase bitcoins? Do I use a credit card or transfer money from my bank? Then how do I get them back to my account?
1
vote
1answer
27 views

Historical BTC data in JSON

As of now, the only API I can find that serves historical data is https://blockchain.info/charts/market-price?timespan=60days&format=json. It only uses USD, and I need to serve non-USD data. My ...
2
votes
1answer
30 views

How would one go about generating a BIP-38 encrypted vanity address for cold storage?

I want to generate a vanity address with BIP-38 encryption for a cold storage paper wallet, how would I go about securely making one? From what I've found, generating a vanity address with Vanitygen ...
3
votes
2answers
54 views

How often does a block have only one transaction?

I was looking at blocks on blockchain.info, and came across this one with only one transaction in it: (the mining reward one) ...
1
vote
2answers
46 views

How does Ripple ensure that transactions take place

I am struggling with some concepts in the Ripple system. As I understand it: After an American user goes to a gateway and loads $ into the Ripple system that he wants to send to Cambodia, the ...
1
vote
1answer
35 views

Encrypting Bitcoin private keys instead of printing out paper

I follow the procedure of making a cold storage wallet: downloaded copy of bitaddress.org using an off-line computer booted with Ubuntu from CD. Instead of printing out the private keys and ...
3
votes
2answers
64 views

How safe is bitcoin with regard to a random address generation attack?

Imagine an attacker implementing something like the following pseudocode on the fastest ASIC farm money can buy: attack(blockchain, my_address) addresses = ...
0
votes
1answer
31 views

Is there a way to figure out when an address is created?

I'm doing some bitcoin address collections. If there are some meaningful letters in the address or if the address is created in a meaningful time to me, I will buy it. How can I know when the ...
-1
votes
2answers
59 views

Help me understand Bitcoin analytics

I'm trying to use the Blocktrail API to look at the oldest Bitcoin addresses to create a info graph piece - besides looking at historical transactions, what else would be good for me to analyze? \\ ...
0
votes
0answers
23 views

bitcoin and google trends to set a trading strategy [on hold]

I'm interested on bitcoins and google trends, anyone know if there are similar studies to: http://www.idatavox.com/cases/bitcoin-dynamics/ ? It seems quite promising to set new trading strategies ...
0
votes
0answers
22 views

Asus R9 270x mining 24/7 setup

I'm using Asus R9270X-DC2T-2GD5 for mining and the temps remain stable at 68C or below even with 99% GPU load for hours. Stock cooling with my Cooler Master CM 690 II case with positive air flow. I ...
0
votes
0answers
13 views

How to get BitPay to process each settlement using a new address?

Since receiving multiple payments using the same address isn't safe, is there a way to get BitPay to settle the balance using a new address each time? It wouldn't be feasible for the user to log in ...
3
votes
1answer
37 views

Why does Blockchain.info's My Wallet tx volume seem to exceed to total bitcoin network volume?

I was looking at Blockchain.info's tx volume (in BTC) over the previous year. It goes from about 100k to 400k BTC per day with a peak of over 850k BTC around November. ...
0
votes
2answers
41 views

How to run multiple bitcoin RPC commands through the command window?

Yes, I can generate a new address through the bitcoin-qt command console, but how might I run a for loop to generate 100 different addresses? What kind of file does the bitcoin client take? Can I run ...
2
votes
0answers
38 views

When ASICs generate a share, is it always at difficulty 1?

Are they preset to only return difficulty 1 shares when the find a nonce? Then mining software verifies if it meets current target difficulty? Or, if given a different target difficulty, will the ...
0
votes
3answers
45 views

What happens if a TX was a double spend?

What happens if the 'High' risk option (one confirmation) was chosen and then the TX turns out to be a double spend in the end? Would the value deposited be revoked? Would the user be notified ...
0
votes
0answers
17 views

High Resolution Bitcoin Price History (every 10 seconds or better)

I need a BitCoin price history for at least the last 6 months at a resolution of every 10 seconds or higher. Just one major exchange's history would be sufficient. Does anyone know of a place I can ...
0
votes
0answers
22 views

Error trying to send payments with RPC sendmany

Need help fixing this error. Error trying to send payments with RPC sendmany {"code":-8,"message":"Invalid parameter, duplicated address I a running a NOMP mining pool that has payment job breaking ...
0
votes
0answers
17 views

Micro hobbyist trading

I am curious to know if it is possible to easily just buy $5 of Bitcoin and sell it in a few minutes, trying to make mini profits for fun or are the waiting times etc... To long? Thanks
0
votes
1answer
17 views

Does Coinbase have the ability to create a “Business” Account?

Wanted to see if anyone here knew if you are able to work with Coinbase to create a "Business/Corporate" level Accounts? Meaning that when signing up and linking a bank account to your Coinbase ...
0
votes
0answers
5 views

List of Bitcoin Exchanges that have an API that you can trigger purchase Bitcoin via ACH?

I am trying to figure out if there are any other Bitcoin Exchanges that allow you to trigger a USD to BTC transactions through ACH via an API besides Coinbase. I know that Circle allows you to have ...
0
votes
1answer
18 views

Is it possible to get bitcoin-cli without having to build all bitcoin source?

I'd like to use the bitcoin client to examine some of the inner workings of bitcoin-qt (non-invasively, using gets and lists mostly). Is it possible to do this alongside the standard executable? I ...
1
vote
1answer
16 views

How do I generate a bootstrap file on Ubuntu?

I would like to generate a Bitcoin and Dogecoin (qt) bootstrap file on my ubuntu machine. Is there any way to do this? I know it's possible with Windows but I'm on Ubuntu. Thanks.
0
votes
0answers
11 views

What is the format of the databases that are used in the core bitcoin client?

This question tells what each of the files in the bitcoin directory are, but it doesn't explain the structure of the databases used. What is the table structure (columns, data type, etc) for each of ...
1
vote
0answers
10 views

Is there a way to recover the original electrum seed from the encrypted one?

So I accidentally lost my electrum seed and password, but I still have the wallet file, so I was wondering if there is a way to recover the original seed from the encrypted one? I think my password ...
2
votes
1answer
13 views

Is there a JavaScript library for validating P2SH addresses?

I looked at coinstring.js but it looks like it only validates simple BTC addresses (1-prepended addresses). isValid(base58str, version) Validates whether the address string or wallet import ...
0
votes
1answer
21 views

BTC = $ … Does this have to match the sum I'm buying for at an auction?

very new, so this is probably silly but: I want to buy some bitcoin on an auction, but the exchange rate on MultiBit is very slightly dissimilar to the rate offered by the seller on the acution. Will ...
0
votes
1answer
12 views

Is the a library for generating signatures and transactions for scrypt coins?

I'm looking for a library similar to this bitcoin one but that works with scrypt based coins.
0
votes
0answers
5 views

Multibit wallet receiving addresses

I would like to receive bitcoins with multiple addresses, not having to use same address all the time. After I generate a new receiving address in my wallet do I need to back it up again? (Copying ...
0
votes
1answer
14 views

I am trying to get cgminer on Ubuntu 14.04 and the Guide is troubling me

Okay, I am trying to follow this instruction guide: http://www.distrogeeks.com/install-cgminer-3-7-2-ubuntu/ and the 20th step did not work because it could not find the server. I downloaded it from ...
0
votes
0answers
16 views

Forgot password multibit

this is two weeks I am trying to crack my MultiBit portfolio, I do not remember my password recorded in July; I have no old file save my wallet, the word must be no more than 15 characters and must ...
0
votes
0answers
15 views

Armory can't find blockchain files produced by bitcoin-qt

Armory is telling me to restart the application using --satoshi-datadir=[path] But I don't understand how to do this? I'm running MacOSX. I know where the blockchain is. How do I start Armory with ...
2
votes
0answers
25 views

When does the “reject” string have an empty reject reason upon submitting a new block?

I submitted a new block using the rpc command submit. And I just got a "reject" string without a reject reason. I checked the bitcoind source code, and found that it usually sends a reject reason; ...
2
votes
0answers
16 views

What is OP_CODESEPARATOR used for?

Looking at the bitcoin source (https://github.com/bitcoin/bitcoin/blob/v0.9.3/src/script.cpp#L843-L847, specifically), I ran into the the use of the OP_CODESEPARATOR. Am I right in interpreting this ...
2
votes
1answer
29 views

Is BIP analogous to RFC?

It seems that a BIP (Bitcoin Improvement Proposal) is very similar to an RFC (Request for Comments). Can anybody confirm this, or describe major differences in the two approaches?
1
vote
2answers
40 views

Why does txID generation consider signatures?

I've been reading a lot about transaction malleability, and noticed that the only way to achieve it is by altering the transaction signature/s. Why does the protocol even consider the signature in ...
2
votes
3answers
138 views

Papers/Books on how bitcoin works from a mathematical perspective?

I'm a math student interested in Cryptography. Is there any paper or book which explains, in mathematics and cryptography terms, how bitcoin (more general, a digital cryptocurrency system) works? In ...
0
votes
1answer
21 views

What is min time to get first confirmation for transaction?

How much time does it take to get first confirmation for transaction? I don't need the exact number of minutes, just some useful approximation. I found this chart of average confirmation times, but ...
0
votes
1answer
20 views

Multisignature: what happens if the number of signatures exceeds the “threshold” number of public keys?

Let's say a coin has been locked with a 2-of-3 challenge script. In other words, spending the coin requires two signatures, each of which matches one of three designated public keys. Now I try to ...
1
vote
1answer
25 views

Can wider acceptance cause the value to fall?

I've noticed lately that more vendors/companies are accepting Bitcoin: Microsoft being one of the latest and largest. As far as I can tell, though, these companies seem to (mostly) immediately ...
0
votes
0answers
59 views

How were my Bitcoins stolen? [closed]

Just logged in this morning and saw that I lost $69.58 on my blockchain.info account. I didn't use my account yesterday, (I logged in just to check) but I never used it since I had no transactions ...
1
vote
3answers
24 views

Are there any hardware privkey/pubkey generators out there?

I don't mean hardware wallet like Trezor but simply a device that is non-programmable, and not network connectable but will generate key pairs (+ the associated address would be handy but that could ...
0
votes
1answer
26 views

Is Coinbase.com combining / commingling transactions or funds?

In this transaction, I transferred 2 BTC from my Coinbase.com wallet to an external address. Why are there 3 outputs in the transaction? I understand the output of 2 BTC, and the 0.0001 BTC ...

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