Trending questions in Blockchain

0 votes
2 answers

Truffle migrate Error after run testrpc

Simple Solution: // module.exports = { // ...READ MORE

Sep 24, 2018 in Blockchain by Wasim
 • 846 views
0 votes
1 answer

Using Bitcoin's sendmany function with perl

Replace the line  my $action = $api->call('sendmany','',%recipients); with  my ...READ MORE

Sep 11, 2018 in Blockchain by digger
 • 26,740 points • 1,439 views
0 votes
1 answer

Bitcoin Wallet address validation using Json and bitcoin/blockexplorer.

The URL isn't returning JSON. So instead ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,370 points • 2,384 views
0 votes
1 answer

Php code to generate Ethereum wallets.

You can use web3.eth.accounts in web3js web3.eth.accounts.create(); With Php, ...READ MORE

Jul 27, 2018 in Blockchain by slayer
 • 29,370 points • 3,405 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 • 1,973 views
0 votes
1 answer

What does _ mean in solidity language?

The _ symbol is a place holder. ...READ MORE

Aug 10, 2018 in Blockchain by digger
 • 26,740 points • 2,794 views
0 votes
1 answer

How to deploy hyperledger fabric in production level?

Once you set up the Fabric, bring ...READ MORE

Aug 2, 2018 in Blockchain by aryya
 • 7,460 points • 3,156 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 • 1,052 views
0 votes
1 answer

Bitcoinjs-lib getAddress not a function error

You need to pass network parameter to ...READ MORE

Aug 27, 2018 in Blockchain by slayer
 • 29,370 points • 2,045 views
0 votes
2 answers

Does Ethereum Solidity support Associative Arrays?

Here's a little example that passes values ...READ MORE

Sep 17, 2018 in Blockchain by Bobin
 • 1,149 views
0 votes
1 answer

Python Double hash SHA256

You can get the given hash by ...READ MORE

Aug 29, 2018 in Blockchain by slayer
 • 29,370 points • 1,941 views
0 votes
2 answers

Issues while installing Hyperledger Composer

Follow these steps to correctly install: mkdir ~/fabric-dev-servers ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,220 points • 1,154 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
 • 1,172 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 • 1,053 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 • 911 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
 • 15,790 points • 985 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 • 982 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 • 629 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 • 584 views
0 votes
1 answer

How to interact with a Smart Contract on private network using Web3.js?

Once you set up infura you can ...READ MORE

Aug 22, 2018 in Blockchain by Christine
 • 15,790 points • 2,191 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 • 901 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 • 727 views
0 votes
1 answer

How to solve rpc error: code = Unknown desc = timeout expired while starting chaincode error?

In the peer configuration, the port you ...READ MORE

Aug 8, 2018 in Blockchain by digger
 • 26,740 points • 2,752 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 • 617 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 • 1,777 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 • 996 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
 • 1,248 views
0 votes
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 • 1,848 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
 • 15,790 points • 1,233 views
+2 votes
1 answer

How to store data in Hyperledger Fabric after restart?

When you use docker-compose down, all the ...READ MORE

Jul 27, 2018 in Blockchain by digger
 • 26,740 points • 3,140 views
0 votes
1 answer

How to solve “The method personal_newAccount does not exist/is not available” Error?

You are connecting using WS but have ...READ MORE

Jul 27, 2018 in Blockchain by slayer
 • 29,370 points • 3,205 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
 • 740 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 • 473 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 • 1,539 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 • 930 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 • 752 views
0 votes
1 answer

Is there a way to get a trade history report from the Bitfinex API?

You can still fetch your private trades ...READ MORE

Aug 30, 2018 in Blockchain by Perry
 • 17,100 points • 1,724 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 • 746 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 • 3,209 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
 • 860 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 • 1,025 views
+1 vote
1 answer

How to create participant and there identities via rest API in Hyperledger Composer?

If you have already imported an Identity ...READ MORE

Aug 10, 2018 in Blockchain by Perry
 • 17,100 points • 2,477 views
0 votes
1 answer

Web3 ethereum miner_start not implemented.

You have to first enable "miner" API ...READ MORE

Aug 24, 2018 in Blockchain by digger
 • 26,740 points • 1,927 views
0 votes
1 answer

How to send Bitcoins with node.js?

This website https://blockr.io/tx/push will successfully do the ...READ MORE

Jul 20, 2018 in Blockchain by Christine
 • 15,790 points • 3,427 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 • 1,447 views
+1 vote
2 answers

Hex to ASCII conversion shows wrong result.

Hey, I use the following code: public static ...READ MORE

Aug 21, 2018 in Blockchain by Omkar
 • 69,220 points • 1,967 views
0 votes
2 answers

PHP: json_decode - reading category names

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

Sep 7, 2018 in Blockchain by Shotgun
 • 1,264 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 • 813 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 • 1,319 views
+1 vote
1 answer

Unable to convert variable to GMP when initializing Bitpay client class (Laravel)

Bitpay automatically uses the encrypted file store, ...READ MORE

Sep 10, 2018 in Blockchain by slayer
 • 29,370 points • 1,105 views
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