Trending questions in Blockchain

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1 answer

What Regex to use to identify a Block Hash?

Blockhashes are always 64 characters in length. You ...READ MORE

Aug 28, 2018 in Blockchain by digger
 • 26,740 points • 2,594 views
0 votes
1 answer

How to solve “ltdl.h: No such file or directory” error?

It seems like you are missing header ...READ MORE

Jul 26, 2018 in Blockchain by slayer
 • 29,370 points • 4,004 views
0 votes
1 answer

How to access bitcoin Daemon from other services?

You don't need all these things to ...READ MORE

Aug 29, 2018 in Blockchain by digger
 • 26,740 points • 2,523 views
0 votes
1 answer

Getting error during “truffle migrate” for an ethereum contract on testrpc

Can you just try to give network ...READ MORE

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 1,267 views
0 votes
1 answer

How to extend Composer rest Server ?

 It looks like you want to query ...READ MORE

Sep 20, 2018 in Blockchain by Perry
 • 17,100 points • 1,567 views
0 votes
1 answer

Sawtooth Javascript SDK "Batchlist rejected" error

What you can do is use intkey-client to the ...READ MORE

Sep 19, 2018 in Blockchain by digger
 • 26,740 points • 1,610 views
0 votes
2 answers

How to read CGMiner output?

the only thing that made it work ...READ MORE

Sep 17, 2018 in Blockchain by Ruby
 • 1,742 views
0 votes
1 answer

What do I import for SHA encryption in Node.js?

var sha = require('sha.js'); //... getHash() { ...READ MORE

Sep 21, 2018 in Blockchain by digger
 • 26,740 points • 1,498 views
0 votes
2 answers

Why is network already up to date while trying to deploy a contract on truffle?

I guess you have ganache running already ...READ MORE

Apr 24, 2018 in Blockchain by Shashank
 • 10,400 points • 5,548 views
0 votes
1 answer

Can we set a list of discovery nodes in Hyperledger fabric?

New nodes doesn't depend on a single ...READ MORE

Sep 19, 2018 in Blockchain by Christine
 • 15,750 points • 1,565 views
0 votes
2 answers

VBA code leads to #value! in cell but works in immediate box

Function GetPrice(strTicker As String, Optional dtDate As ...READ MORE

Sep 10, 2018 in Blockchain by Garry
 • 1,907 views
0 votes
1 answer

blockchain/service-my-wallet-v3 - Connection refused

Hey, if you have installed blockchain/service-my-wallet properly, ...READ MORE

Sep 18, 2018 in Blockchain by slayer
 • 29,370 points • 1,594 views
+2 votes
1 answer

What is Bitcoin Powered Electrical Outlet?

Bitcoin powered electrical outlet is nothing but ...READ MORE

Sep 20, 2018 in Blockchain by Bhaskar
 • 1,422 views
0 votes
1 answer

Nodejs: How to pass user form data into defined class

This should do your work: // select the ...READ MORE

Sep 19, 2018 in Blockchain by digger
 • 26,740 points • 1,540 views
0 votes
1 answer

ethminer failed to submit hashrate

The pool you are linking with the -F flag ...READ MORE

Sep 24, 2018 in Blockchain by digger
 • 26,740 points • 1,318 views
0 votes
1 answer

How are the ethers sent to smart contract in the IBM example?

They are in magical variable msg. The function ...READ MORE

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 1,121 views
0 votes
1 answer

Public key encoding changes

You are printing the memory address of ...READ MORE

Sep 19, 2018 in Blockchain by Christine
 • 15,750 points • 1,504 views
0 votes
1 answer

ERRO : Error trying to connect to local peer: grpc: timed out trying to connect

You need to use the correct port ...READ MORE

Sep 17, 2018 in Blockchain by slayer
 • 29,370 points • 1,591 views
0 votes
2 answers

Trying to issue tokens on testnet with python API

By looking at - documentation here I think you ...READ MORE

Sep 17, 2018 in Blockchain by Khush
 • 1,544 views
+1 vote
1 answer

Coinbase API: Get transaction fees

The Coinbase "fee" is the difference between ...READ MORE

Aug 23, 2018 in Blockchain by digger
 • 26,740 points • 2,607 views
0 votes
1 answer

Not able to send Ethereum transaction

Hey, Change this line: await crowdsale.sendTransaction({value, from: buyer, gas: ...READ MORE

Sep 24, 2018 in Blockchain by slayer
 • 29,370 points • 1,253 views
+4 votes
4 answers

How does the blockchain verification process work?

First of all, when someone creates a ...READ MORE

Mar 26, 2018 in Blockchain by Perry
 • 17,100 points • 4,532 views
0 votes
1 answer

'Invalid sender' error after upgrading to geth 1.4.0

Guessing that the JSON RPC stuff changed ...READ MORE

Sep 11, 2018 in Blockchain by Christine
 • 15,750 points • 1,803 views
0 votes
1 answer

PHP Bitcoin validate from form

isValid($addr, $version) $addr: A bitcoin address $version: The ...READ MORE

Sep 3, 2018 in Blockchain by slayer
 • 29,370 points • 2,148 views
0 votes
1 answer

How do you obtain the transaction uuid after submitting an invoke transaction using the nodejs HFC

The results returned via the 'submitted' event ...READ MORE

Sep 14, 2018 in Blockchain by slayer
 • 29,370 points • 1,646 views
0 votes
2 answers

PHP: json_decode - reading category names

<?php function findHighestBid() { $result = ...READ MORE

Sep 7, 2018 in Blockchain by Shotgun
 • 1,905 views
0 votes
1 answer

How to make POST request on C# to blockr.io

By default UploadValues doesn't format the data ...READ MORE

Aug 30, 2018 in Blockchain by digger
 • 26,740 points • 2,284 views
0 votes
1 answer

How connect library to smart contract from external resources?

pragma solidity ^0.4.0; import "github.com/OpenZeppelin/zeppelin-solidity/contracts/math/SafeMath.sol"; contract MathExtended { ...READ MORE

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 1,117 views
0 votes
1 answer

Problem while compiling BitcoinJS for browser

The problem iss that you are using browserify wrong ...READ MORE

Aug 30, 2018 in Blockchain by digger
 • 26,740 points • 2,281 views
0 votes
1 answer

How to create raw transaction using web3swift?

var options = Web3Options.defaultOptions() options.gasLimit = BigUInt(21000) options.from = ...READ MORE

Sep 17, 2018 in Blockchain by slayer
 • 29,370 points • 1,503 views
0 votes
1 answer

How to use ethereum contract's state changing method in javascript?

You'll find that the message is indeed ...READ MORE

Sep 11, 2018 in Blockchain by Christine
 • 15,750 points • 1,748 views
0 votes
1 answer

How to compute SHA256 hash for bitcoin header

header_hex = "02000000aaf8ab82362344f49083ee4edef795362cf135293564c4070000000000000000c009bb6222e9bc4cdb8f26b2e8a2f8d163509691a4038fa692abf9a474c9b21476800755c02e17181fe6c1c3" # Decode header hex into ...READ MORE

Aug 31, 2018 in Blockchain by digger
 • 26,740 points • 2,216 views
+1 vote
1 answer

Is there a way to send funds from a specific bitcoin address in a wallet?

I'll answer my own question, It was unbelievably ...READ MORE

Sep 3, 2018 in Blockchain by Perry
 • 17,100 points • 2,046 views
0 votes
1 answer

Required parameter missing: account error

You need to swap out the place ...READ MORE

Aug 30, 2018 in Blockchain by slayer
 • 29,370 points • 2,258 views
0 votes
1 answer

How do I withdraw the balance from a contract on Ethereum test blockchain?

Your need to improvise your code a ...READ MORE

Aug 3, 2018 in Blockchain by Perry
 • 17,100 points • 3,400 views
0 votes
1 answer

How to get all address and send ethers in solidity using a loop?

I found a similar code somewhere: contract  Holders{ uint ...READ MORE

Jul 31, 2018 in Blockchain by digger
 • 26,740 points • 3,521 views
0 votes
0 answers

How to send Bitcoins with node.js?

I am trying to make a web ...READ MORE

Jul 20, 2018 in Blockchain by sabby
 • 4,370 points • 4,030 views
0 votes
1 answer

Cannot download fabric-sdk-go.

This happens and I know how frustrating ...READ MORE

Sep 18, 2018 in Blockchain by digger
 • 26,740 points • 1,403 views
0 votes
1 answer

how loop through a JSON Array of bitcoin transaction data

for($i=0; $i<count($result['out']); $i++) { echo ...READ MORE

Sep 21, 2018 in Blockchain by slayer
 • 29,370 points • 1,271 views
0 votes
1 answer

pybitcointools pushtx TypeError: expected string or buffer

From the looks of it, you need ...READ MORE

Sep 6, 2018 in Blockchain by digger
 • 26,740 points • 1,916 views
+1 vote
1 answer

Node.js blockchain bitcoin api

The callback URL should be the one ...READ MORE

Sep 10, 2018 in Blockchain by slayer
 • 29,370 points • 1,703 views
0 votes
1 answer

How to create a private bitcoin network using bitcore?

I think you need to add your ...READ MORE

Sep 6, 2018 in Blockchain by slayer
 • 29,370 points • 1,910 views
0 votes
1 answer

Etheruem: Pyethereum Error

Try running this: sudo easy_install -U setuptools In my ...READ MORE

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 958 views
0 votes
1 answer

How to handle Overlapping of array objects in node js

Try this code, may be it works for ...READ MORE

Sep 18, 2018 in Blockchain by digger
 • 26,740 points • 1,380 views
0 votes
1 answer

How to get iota balance via api url?

Either run your own node (thus, the localhost reference ...READ MORE

Sep 12, 2018 in Blockchain by digger
 • 26,740 points • 1,622 views
0 votes
1 answer

Hyperledger Fabric peer command not found error.

This error occurs when the system can ...READ MORE

Jul 2, 2018 in Blockchain by Omkar
 • 69,180 points • 4,720 views
0 votes
1 answer

How to connect to already running go ethereum client using mist Ubuntu

Hey, you can solve the issue by using sudo ...READ MORE

Sep 18, 2018 in Blockchain by digger
 • 26,740 points • 1,358 views
0 votes
1 answer

Not able to run chaincode locally using docker

Looks like the Fabric team introduced "nopkcs11" ...READ MORE

Sep 18, 2018 in Blockchain by slayer
 • 29,370 points • 1,355 views
0 votes
1 answer

What's the difference between ethereum and chain?

Ethereum is an open source blockchain platform ...READ MORE

Sep 12, 2018 in Blockchain by Perry
 • 17,100 points • 1,613 views
0 votes
1 answer

Why do people prefer mining Litecoin over Bitcoin?

The main reason people prefer mining Litecoin ...READ MORE

Sep 21, 2018 in Blockchain by slayer
 • 29,370 points • 1,192 views
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