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

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2
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1answer
48 views

How does PoW solved in miner.cpp gets transferred to main.cpp in source code?

As per my understanding of bitcoin codebase, the following events happen after we solve a proof of work. In miner.cpp, once the miner thread solves a new Proof-of-work (PoW), ProcessBlockFound ...
1
vote
1answer
43 views

Are there any web wallets around with open APIs?

For a long while, blockchain.info offered a web wallet with a convenient web API, but it recently turned out that it now requires an installation to function. I'm wondering - are there any other ...
1
vote
0answers
29 views

Looking for a Project Ideas [closed]

Im a student at Sri Lanka institute of information technology and I am reading for cyber security BSc. I'm supposed to do a research project with a group of four people within an year. We are ...
0
votes
0answers
35 views

Are blockchain reputation networks viable?

There has been much interest lately in how the blockchain could be used as the underpinnings of reputation network. For example, ...
0
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0answers
12 views

Write code on blockchain.info api(PHP) [duplicate]

I want to write contract(Application) on block-chain.info using PHP and JSON...How would i start?And how would i place that contract on block-chain bitcoin network?
0
votes
0answers
63 views

blockchain.info php api

Hello I am new to this block chain environment,but i am currently working on project which requires blockchain.info api(php),so could anybody please tell me how to use this api in order to send data ...
1
vote
1answer
20 views

Blockexplorer.com API POST error

I'm trying to write Python code which utilises the (Insight) Blockexplorer.com API , particularly the POST functions. I'm testing using the iOS REST app, Restler (see screenshot). The call I'm trying ...
2
votes
2answers
60 views

How do I use Stellar API to power my Universal Trading and Multicurrency Payment+Transacton Gateway?

I am planning to build on top of Stellar a unified universal gateway+trading platform(all frequencies) for banks and financial institutions to power ultrafast international payment transfers in ...
0
votes
1answer
36 views

Is it plausible to make a decentralized rendering farm by creating a new cryptocurrency?

I had this idea to create a new cryptocurrency that uses rendering as mining, using it to create a decentralized render farm. is it possible, and if yes, then how? Sorry the question is not in depth. ...
0
votes
3answers
87 views

A “Hello World” of bitcoin?

I would like to write a very simple program in bitcoin. I thought a simple C program that accepts the mined blocks would be appropriate. So I assume, the program would open a socket connection to some ...
5
votes
2answers
67 views

Using bitcoin in a startup company

We are a start up company going to open an online shopping website. Our CEO wants to incorporate Bitcoin as our payment method. How can we set up a Bitcoin network?
1
vote
1answer
152 views

How to start programming using Ethereum?

I'd like to listen opinions of people that have created already their own working contract. What have you read at the beginning and then? What was the most powerful source that helped you understand ...
1
vote
1answer
102 views

Constructing, signing, and pushing a Bitcoin transaction by using pybitcointools with Python

I'm utilizing the pybitcointools module in python 3.4 I've went through time and time again in the examples listed on the github page, but it isn't documented very well nor is the code. My situation ...
2
votes
1answer
30 views

How can I request payment to a set of addresses?

I am building a payment processing service where a single payment may be split among multiple individuals. While it would be possible for me to write the service in such a manner that a customer pays ...
0
votes
0answers
65 views

Send and Receive Bitcoin - development

How to develop send and receive bitcoin using coinbase api, i need to use in java. i tried the sample from https://github.com/coinbase/coinbase-java by using readme.md instruction. but facing issue. ...
1
vote
1answer
38 views

What is the function of LOCK(cs_main)?

Does LOCK(cs_main) pause and branach the program in order to do some necessary job before going on? I'm trying to publish blocks reactively (as a selfish miner) upon receipt of inventory message from ...
0
votes
0answers
152 views

how to add extranonce-subscribe to mining pool?

i setup a pool my pool. miner can mine without new protocol extranonce using "no-extranonce=true" setting . but some miner seems pool dead without it. i want to add extranonce-subscribe support to ...
0
votes
0answers
73 views

block found in wallet, receving rewards, but not tracked by pool

i setup altcoin mining pool . some of wallets shows block found and receive rewards by miner , but not tracked block in pool. there are some wallets working well. ...
0
votes
1answer
45 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 ...
1
vote
2answers
223 views

Want to write my own solo cpu bitcoin miner

I just want to understand how this mining process works (from the developers point of view from very start to end). Can someone guide me towards a doc or a open source code (I am newbie here so a VERY ...
1
vote
1answer
64 views

BIP39 Japanese Mnemonic vector unit test process

There is a json for unit tests of Japanese characters which I want to validate using Python, specifically with this fork of pybitcointools, which has bip39 functionality. Unit tests from Trezor's ...
0
votes
0answers
56 views

what is the real formula to calculate difficulty of share received from miner with params(nonce,ntime,target,diff1)?

how can i calculate share difficulty? i have higher share difficulty value issue at this calculation. using coiniumserv pool. ...
3
votes
2answers
236 views

Can an Ethereum contract be updated without having to be re-submitted?

I am wondering - can an Ethereum contract be updated without having to be re-submitted? Say, if I find a bug in my contract, can I fix it without having to create a new contract and making my ...
2
votes
4answers
346 views

Is it possible to schedule function calls to an Ethereum smart contract?

I am wondering - is it possible to schedule or somehow trigger function calls to an Ethereum smart contract based on the current block height or timestamp? This would involve some pre-payment of gas ...
0
votes
1answer
242 views

What data is available to Ethereum smart contracts?

I'm wondering - what data is available to the Ethereum smart contracts? I stumbled upon some tutorials on how to write the contracts that give some indication as to a few examples of the data is ...
0
votes
2answers
46 views

Naming Convention In Bitcoin Source Code

Is there specific reference for naming conventions in Bitcoin Core source code? I see regularity in class naming with prefix "C" (Chain, CInv etc.) or pointer naming with "p" (pprev, pnode etc. ) and ...
1
vote
1answer
81 views

How do I print unspent transaction outputs of an address using pybitcointools

I am a beginner looking to write a simple program that takes an input (address) and prints the unspent amount in it. I copied some code from chapter 4 of Mastering Bitcoin to generate a random ...
1
vote
1answer
99 views

How to pass parameters for multisignature addresses from Perl to the JSON::RPC::Client?

I'm trying to create a multisig address with JSON::RPC::Client but I don't know how to pass the parameters. I can pass simple params such as in validateaddress that requires only ...
6
votes
1answer
80 views

Is there a more space-efficient way to prove that a transaction is contained within a block?

SPV clients, like Electrum, ask for cryptographic proof that a transaction is contained in a block. This is done by including each merkle branch necessary to get a hash that's equal to the merkle root ...
1
vote
0answers
24 views

listsinceblock returning block on fork

Im considering using listinceblock to monitor incoming bitcoins to my app. What happens if the block returned by listsinceblock ends up being on a dead-end fork?
2
votes
2answers
185 views

What Ripple API libraries are available?

I am wondering, what libraries are out there for communicating with Ripple through its API (either websocket or JSON RPC)?
3
votes
0answers
119 views

Working example of raw transaction utilising Boolean (OP_IF, OP_ENDIF) scripting REQUIRED

I recently posted this Testnet TX (TxID 2d0daa01da8294a54178f8111eb2a02010c425fd15957d8baee8717edcfbe105) which successfully spends an output (TxID ...
-1
votes
1answer
481 views

How does Cryptsy's Trade Key system actually work

I am building an altcoin to altcoin trading site wherein any Member can trade any altcoin for any other altcoin ... (Top 60 or so Altcoins are supported). I need to know how Cryptsy's Trade Key ...
1
vote
2answers
4k views

Solving PyCrypto 2.6.1 errors for Python 3.4 (Windows7 x64)?

Whilst there's less of an issue with Python 2.7, Python 3.4 relies on the pycrypto library for numerous wrappers/APIs/tools such as BlockTrail, pycoin, pybitcointools, etc etc. The error I'm ...
2
votes
1answer
131 views

Creating your own Bitcoin price ticker

Say that you wanted to build your own Bitcoin price ticker from scratch, and not rely on other tickers; how would you go about that? What variables would come in to play? How would you gauge the ...
0
votes
4answers
495 views

What programming language should I learn to create a new altcoin?

I've been wondering. What programming language is needed to develop and maintain an altcoin? Because I've been thinking to try creating my own altcoin. I've seen a lot of services to develop an ...
1
vote
1answer
31 views

What is NXT's “lessor”?

While reading NXT's API wiki page I came across something called a "lessor", but I can't find its definition anywhere. What is a lessor?
1
vote
1answer
56 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 ...
1
vote
1answer
329 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 ...
2
votes
4answers
778 views

What programming language should be used to develop Bitcoin exchange software? Why?

I've only heard PHP is terrible (e.g. in the context of Mt. Gox) and a more efficient/more security-oriented language would be preferable for matching orders and account security. Which programming ...
3
votes
3answers
2k views

Blockchain programming books C#?

EDIT 1: It seems that what I really want to learn is how to create software which makes use of a distributed hash table. ORIGINAL QUESTION: I want to learn about coding my own blockchain based ...
2
votes
1answer
64 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, ...
4
votes
2answers
377 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 ...
0
votes
2answers
80 views

How to tell which account an unspent output 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
71 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
votes
1answer
42 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
votes
1answer
179 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
vote
1answer
162 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
vote
1answer
178 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
votes
1answer
77 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 ...