Related to creation and ongoing work for different existing and future Bitcoin-related projects and source code.

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0
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1answer
24 views

How to tell which account an unspent vout is in?

When I go to send coins, I want the transaction to ignore the unspent coins in a certain account. I think I can do this in wallet.cpp, but I'm not sure how. Maybe in the AvailableCoins() function? ...
3
votes
1answer
37 views

How to best structure Internal bitcoin payments within a webapp?

I'm building out a pet project webapp called CollaboTree, a big part of it is allowing users to set bounties for completing/collaborating on little bits of work. I'd like these micro payments to be as ...
0
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0answers
51 views

Overview of Blockchain 2.0 smart contracts for the layman?

I have a pretty good understanding of how the Blockchain secures data using hashed inputs of the previous block and being secured by the P2P distributed network. What I'm interested in is a layman ...
0
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1answer
32 views

Bitcoin packages

Are there any bitcoin package/librairies in popular langage that would make the recuperation of prices easy ? I have the exemple of the Quantmod package for R that allows you to get market data from ...
0
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1answer
61 views

Blockchain command line tools

I was under the assumption that the bitcoind server allowed you to query the blockchain and run commands like bitcoind getbalance on any address. I'm finding out that you may query addresses in your ...
1
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1answer
110 views

What is the incentive behind using platforms such as XDP/Dogeparty?

ELI5: What can one do with XDP that s/he cannot do with DOGE? Is Dogeparty similar to projects such as Ethereum/Ripple? If I understand correctly one receives 1 XDP/1000 DOGE "burned". How are these ...
1
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1answer
43 views

Get private key from BigInteger

I have a BigInteger that represents a private key. How can I get that private key as a base58 encoded string? The following pseudo code does not work properly: base58.encode(bigInt.toByteArray) // ...
0
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1answer
43 views

Script for sending funds to a multisig address

Does sending funds to a multisig address require different script than the one used for ordinary addresses? If yes, how should this script look like? (Under multisig address I mean Bitcoin script hash ...
0
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1answer
62 views

How many bits are in a Bitcoin?

I need to track an amount of Bitcoins in a database. Is a UINT64 sufficient? I'd rather not deal with floating point types, and the rounding errors they end with.
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2answers
28 views

Transaction change calculation

I'm confused about how exactly I should compute a change for transactions. Say, for a given address I have 4 unspent outputs containing 2 BTC each and I want to send 5 BTC to other address. Here's ...
-4
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2answers
41 views

WeaveCoin - Extremely High-Speed AltCoin - Is this Possible? [closed]

I've written a proposal for an extremely extremely high-speed transaction verification algorithm: http://kenthagerman.blogspot.ca/2014/08/weavecoin-high-speed-crypto-currency.html Is this possible? ...
0
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1answer
67 views

How do cryptocurrency exchanges like Mintpal manage so many?

As there are 100s of crypto coins each with their own QT-client, how do exchanges manage the transactions? Do they use the core client of every altcoin in the servers or will they be programming code ...
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0answers
51 views

Gitian Build Issue - Windows

Got a little issue when compiling Windows QT using Gitian. BTW Im using a Ubuntu 12.04 64bit VPS. So I am using the instructions here : ...
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0answers
32 views

Other ways to determine the validity of a public key

Public key 3, 4 fits the equation of y^2 = x^2 + 7 Yet this comes up as an "invalid public key". How is that invalid? Sure, it deviates extremely from other numbers, but what other equations are ...
1
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1answer
91 views

Ripple partial payments

I've read on the Ripple Wiki page for Transactions about partial payments. I am wondering how a partial payment would look when data is polled about an account? Would the transaction amount be ...
0
votes
1answer
44 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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0answers
45 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 ...
0
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1answer
64 views

Modular Inverse for ECDSA in C++

I've seen several variations on "modular inverse" but I can't seem to identify the proper way of utilizing it for C++. I'm not sure how this python code translates into c++: def inverse(x, p): """ ...
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0answers
70 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 ...
0
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1answer
40 views

Is Block Height 1 is the genesis block?

As the question I asked before, I wanted to make an altcoin. The block height in main.cpp allows you to choose which block gets different rewards. If it does, do txNew.vout[0].nValue = depend on the ...
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1answer
192 views

Got an issue compiling

After working my way through many errors compiling an alt-coin windows qt. Everything compiles fine right until the final stage when the system is putting together the exe. You can find the error ...
0
votes
4answers
81 views

Error compiling altcoin-qt for Windows, getting a GCC internal compiler error

I think I managed to get all my dependencies and libraries right (fingers crossed), but now when trying to build blackcoin-qt, the QTSdk compiler gives me this error while building qtipcserver.o: In ...
0
votes
0answers
26 views

GetBlocks Message containing Transaction Hashes

I'm sending a getBlocks Message which returns me an Inv Message containing up to 500 block-hashes as specified in the Protocol Specification. The Specification says: The maxium count for a an ...
0
votes
1answer
105 views

Programming and the ECDSA equation

I've been implementing point addition into a c++ program I've written but I don't see how this can be done right. When I do slope = (y1 - y2)/(x1 - x2) I get a freaking decimal, which doesn't produce ...
2
votes
1answer
102 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 ...
0
votes
2answers
69 views

Bitcoin Transaction within source code

I am messing with the Bitcoin sourcecode. Normally when you want to send some BTC you type : ./bitcoind sendtoaddress 1ADRESSS 0.001 How would you do this in the sourcecode on a recurring basis? ...
1
vote
1answer
43 views

Wallet programming, search transactions by address

This may be a silly question, but I keep running in circles. Using either bitcoind or JSON-RPC is there a way to search all transactions involving a address hash? I understand every wallet and most ...
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0answers
25 views

multiple wallets in bitcoinj ?

Is there a possibility of using multiple Wallets, that are running synchronous in Bitcoinj? I've alredy tried to use several WalletAppKits but this does not work.
4
votes
1answer
561 views

what programming languages are used to built bitcoin?

I have one very basic question, I would like to know: what programming languages are used to built bitcoin?
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0answers
28 views

Should mining.notify.merkle_branches contain the coinbase transaction or not?

Okay I'm working on a new pool-server though got a question. I'm using litecoin testnet right now to test stuff and here's a getblocktemplate() response I get; { "result": { "version": 2, ...
2
votes
2answers
171 views

Bitcoin private key, location on ECC curve

In the ECDSA algorithm, the Bitcoin private key is supposedly a point on the graph (or is it?). But the private key is a single integer, and not x,y coordinates. Is the integer, by itself, the x ...
3
votes
2answers
113 views

Does the Bitcoin Core API support high-precision balance display?

I am currently working with a number of altcoins and and I need to support deposits and withdrawals in currencies with very large coin number cap like Dogecoin. I am wondering whether the Bitcoin Core ...
8
votes
2answers
432 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 ...
0
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2answers
153 views

Generating Ripple address

I am trying to recreate the Ripple address from Account Family wiki page and I am having some problems. I have the private generator of ...
0
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1answer
114 views

How does a proof of work limit of `~uint256(0) >> 20` translate into a difficulty of `1 / 2^12`?

In the Litecoin source it is written: static CBigNum bnProofOfWorkLimit(~uint256(0) >> 20); // Litecoin: starting difficulty is 1 / 2^12 How does that compute? ~uint256(0) >> 20 is ...
7
votes
3answers
535 views

Is it possible for more than 21 million bitcoins to exist if 51% agree?

One of the commonly cited advantages of bitcoin is that there's guaranteed to be only 21 million bitcoins. However, my understanding is that the bitcoin protocol is patched by an opensource ...
1
vote
1answer
43 views

In what line of what file does the block reward depend on?

I want to make an altcoin and since I am new, I wanted to know what sets the reward of a block after being mined.
1
vote
1answer
66 views

Walletnotify under windows

Few questions about Walletnotify under win: 1) Is this the rigt way to write .py script into litecoin.conf: walletnotify=C:\Python27\python.exe D:\LiVe\listener.py %s If not, how it should be ...
0
votes
3answers
153 views

Getting sender address, python

Getting senders account Say we got txid by listtransactions: "txid" : "2ca54b92338e52bbb16562dd7a91e8670d9362bb255e21fb568acc13e732b6b7" then getrawtransaction ...
0
votes
1answer
82 views

Bitcoin peer to peer network source code

Does anybody know a place to get the source code of the Bitcoin Peer to Peer network? I only need the P2P network portion of the Bitcoin protocol. I am going to implement a new virtual currency. So i ...
2
votes
1answer
56 views

Why are broadcast checkpoints considered bad?

warren, a LiteCoin dev, said of Peercoin: Good Luck Removing PPC's Centralized Checkpoints Regarding PPC... these amount to empty obfuscating defensive excuses. Sure he wants to remove the ...
2
votes
2answers
88 views

Which altcoins have testnets?

Bitcoin can be run on a public testnet (by using a different port than the real Bitcoin network). This is very useful for development, because you can test software handling Bitcoin without handling ...
3
votes
2answers
164 views

How to create a SPV client?

What are the steps a SPV client takes in order to sync? Connect to a peer Set bloom filter for wallet addresses Download all block-headers since latest checkpoint Request every block again with ...
0
votes
1answer
73 views

Programming for/modding bitcoin-qt on Windows

In multiple places I've found methods of modifying or adding to the bitcoin-qt(or other coin wallet) source on ubuntu or osx, but how would I do this on a Windows machine? If possible, I'd like to be ...
1
vote
2answers
349 views

How can I find out how much bitcoin is in existence with PHP?

I'm running a Bitcoin blog and I'd love to display a ticket of the total amount of Bitcoins in existence. Unfortunately, I'm not sure where I can find a JSON feed for this (now that MTGOX is gone). Is ...
0
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0answers
31 views

Could PageRank be adapted to calculate credit ratings?

PageRank is a measure of the popularity of a page within a network of pages. A credit rating is a measure of the popularity of a trader within a network of traders. So could PageRank be adapted ...
0
votes
1answer
86 views

Bitcoin Exchange Api [duplicate]

I need an bitcoin exchange api implemented in my website. Basically there will be one way transactions money->bitcoin and it needs to support major credit cards (visa,mastercard) as well as paypal ...
2
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0answers
79 views

Bitcoind Performance for production usage

Lets say we have one instance of bitcoind running on the production server. And our exchange software/application interacts with it using RPC callbacks for: address generation withdrawal ...
0
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0answers
17 views

Generated coins are sent in the next transaction

Mintcoin block 59000 says POS-generated coins are sent in the next transaction. But the next transaction doesn't contain any generated coins. So, where are the generated coins sent?
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2answers
336 views

How do I use Blockchain.info's Receive Payments API with node JS / Express?

Blockchain has great documentation for PHP, but nothing really for node! Does anyone here have any projects,where they used the blockchain.info Receive Payments API, in their node apps, to receive ...