Most viewed questions in Blockchain

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1 answer

How to solve “Error: Expected a Resource or Concept”?

There are few errors in code. I ...READ MORE

Jul 31, 2018 in Blockchain by slayer
• 29,350 points
876 views
0 votes
1 answer

How i can use nodejs to watch transactions in bitcoin network?

you can use  const Socket = require('blockchain.info/Socket'); const mySocket ...READ MORE

Jul 9, 2018 in Blockchain by digger
• 26,740 points
874 views
+1 vote
3 answers

Is it possible to store data about arbitrary objects on the blockchain using smart contracts?

Consider following tutorial from Hyperledger Fabric "Getting Started" pages. Basically ...READ MORE

Aug 30, 2018 in Blockchain by Artem
869 views
+1 vote
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Can I change the network id in ganache GUI? Is it work for calling the functions in solidity?

Can I change the network id in ...READ MORE

Aug 16, 2019 in Blockchain by anonymous

edited Aug 19, 2019 by Omkar 868 views
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1 answer

How to create a new wallet on a blockchain?

Firstly, you need to have a clear ...READ MORE

Apr 4, 2018 in Blockchain by Christine
• 15,790 points
868 views
0 votes
1 answer

Web3 1.0: What does `web3.eth.call(tx)` return for a contract creation?

The returned bytestring is the deployedBytecode of the contract, ...READ MORE

Sep 17, 2018 in Blockchain by digger
• 26,740 points
865 views
+1 vote
1 answer

Hyperledger network roles assigned to peer nodes.

In a hyperledger fabric network transactions are ...READ MORE

Apr 4, 2018 in Blockchain by Christine
• 15,790 points
864 views
0 votes
1 answer

Why estimateGas always returns null or zero?

The Web3 API uses error first style callbacks. Your ...READ MORE

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

Difference between Fabric Composer and Hyperledger Composer?

They are basically the same thing. Fabric ...READ MORE

Aug 9, 2018 in Blockchain by digger
• 26,740 points
863 views
0 votes
1 answer

How to use different network cards for multiple composer rest server users?

You are getting the same network card in ...READ MORE

Dec 6, 2018 in Blockchain by Perry
• 17,100 points
861 views
0 votes
1 answer

Hyperledger Fabric: How to start/stop the fabric nodes?

This is another way to do it: docker ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
• 69,190 points
861 views
0 votes
1 answer

Hyperledger Fabric: Cant create channel on peer

Add host entries to your /etc/hosts should resolve your ...READ MORE

Oct 26, 2018 in Blockchain by Omkar
• 69,190 points
861 views
+4 votes
5 answers

How is Blockchain a distributed database?

Think of blockchain as a relatively slow, ...READ MORE

Mar 26, 2018 in Blockchain by Christine
• 15,790 points
861 views
+1 vote
1 answer

What are the differences between blockchain programming and our traditional programming languages?

On higher level comparison, there are quite ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
• 10,400 points
860 views
0 votes
1 answer

Hyperledger fabric: curl not working to invoke chaincode

Hyperledger Fabric does not offer a REST ...READ MORE

Oct 23, 2018 in Blockchain by Perry
• 17,100 points
859 views
0 votes
1 answer

Hyperledger remove asset

Data on a blockchain won't ever be ...READ MORE

Jul 4, 2018 in Blockchain by Christine
• 15,790 points
857 views
0 votes
1 answer

Integrating web3 in cloud functions module

I had this issue and my problem ...READ MORE

Oct 17, 2018 in Blockchain by Perry
• 17,100 points
854 views
0 votes
1 answer

Truffle deployer is not working

If you have deployed it before, then ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
• 69,190 points
851 views
0 votes
4 answers

Unable to run truffle@2.1.2 migrate --network live. “Exceeds block gas limit”

A simple solution to avoid this is: module.exports ...READ MORE

Sep 28, 2018 in Blockchain by Ludo
851 views
0 votes
1 answer

How to solve “network state unknown. Review successful transactions manually” error?

There seems to be error in the ...READ MORE

Jul 27, 2018 in Blockchain by digger
• 26,740 points
851 views
+1 vote
0 answers

How to check a Bitcoin wallet balance from first generated address (m/44'/0'/0'/0/0)

Is there a way to check a ...READ MORE

Mar 9, 2022 in Blockchain by Soham
• 9,700 points
849 views
0 votes
1 answer

IPFS transaction cost as a decentralized service

IPFS itself does not have transaction cost, ...READ MORE

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

Is the msg.sender address changed while passing to another contract as a parameter?

I tried your contracts in Remix, but ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
• 69,190 points
846 views
0 votes
2 answers

Hyperledger: ./byfn.sh -m up gives error

just follow those steps: docker ps -aq ...READ MORE

Oct 21, 2020 in Blockchain by anonymous
845 views
0 votes
1 answer

Solidity code to change value of name

Try this for setName: function setName(string _name) public ...READ MORE

Jul 30, 2018 in Blockchain by slayer
• 29,350 points
844 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
840 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
838 views
0 votes
1 answer

What is CA (Authority) in Hyperledger Fabric?

Hyperledger fabric includes a modular Certificate Authority ...READ MORE

Jul 12, 2018 in Blockchain by shweta
• 440 points
835 views
0 votes
1 answer

How to interact with blockchain from web application?

You can use the Web3.js library to interact ...READ MORE

Jan 11, 2019 in Blockchain by Omkar
• 69,190 points
833 views
0 votes
1 answer

Hyperledger composer: runtime install error card not found peerAdmin

The right way to do it is: downloadFabric.sh startFabric.sh createPeerAdminCard.sh If ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
• 69,190 points
833 views
0 votes
1 answer

How can I change endorsement policies in hyperledger?

Well the good news is that it ...READ MORE

Jul 19, 2018 in Blockchain by Johnathon
• 9,090 points
831 views
0 votes
1 answer

Bitcoin pool mining using stratum

JSON string shouldn't have any spaces. So ...READ MORE

Aug 20, 2018 in Blockchain by digger
• 26,740 points
830 views
0 votes
0 answers
0 votes
1 answer

Docker: How to connect Node.js in container to Hyperledger Fabric?

You need to map ~/.composer/cards of your Docker host ...READ MORE

Oct 31, 2018 in Blockchain by Omkar
• 69,190 points
822 views
0 votes
1 answer

Blockchain secret sharing

Blockchain has many methods to provide data ...READ MORE

Feb 12, 2019 in Blockchain by Omkar
• 69,190 points
821 views
0 votes
1 answer

Trying to understand nbits value from stratum protocol

You are right, nbits is current network difficulty. Difficulty encoding ...READ MORE

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

Solidity and Web.js for Ethereum blockchain data

Your code is not right. I have ...READ MORE

Jul 30, 2018 in Blockchain by digger
• 26,740 points
821 views
0 votes
1 answer

How to sync private nodes in geth and testRPC locally?

HI. As much as I know, running ...READ MORE

Jan 16, 2019 in Blockchain by Omkar
• 69,190 points
818 views
0 votes
1 answer

Ethereum Mist: Compiling Error with sha3

First run: npm install sha3 and then sudo ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
• 69,190 points
818 views
0 votes
1 answer

How to get the current price of a cryptocurrency on google sheets from coinmarketcap?

Your code does not appear to use ...READ MORE

Apr 12, 2022 in Blockchain by Soham
• 9,700 points
816 views
+1 vote
1 answer

I am unable to change port of composer-rest-server. Please help!

Use full format for running a business ...READ MORE

Mar 27, 2018 in Blockchain by Christine
• 15,790 points
816 views
0 votes
1 answer

Hyperledger: Not able to connect from docker container to validator. curl http://rest-api:8008/blocks

The REST API service is exposed on ...READ MORE

Nov 2, 2018 in Blockchain by Omkar
• 69,190 points
814 views
+1 vote
1 answer

How is ordering of transactions done in a block in hyperledger?

Consensus is the key concept for validating ...READ MORE

May 3, 2018 in Blockchain by Christine
• 15,790 points
813 views
0 votes
1 answer

How to make any node connect to multichain?

You can change the configuration of the ...READ MORE

Mar 1, 2019 in Blockchain by Omkar
• 69,190 points
812 views
0 votes
1 answer

client_id in Bitstamp's API

You can use this Ruby code: require 'open-uri' require ...READ MORE

Sep 3, 2018 in Blockchain by digger
• 26,740 points
809 views
0 votes
1 answer

how do we register our assets in hyperledger?

First of all, the chaincode (or smart ...READ MORE

May 26, 2018 in Blockchain by Johnathon
• 9,090 points
809 views
0 votes
1 answer

How to get Bitcoin Private Key from an ExtPrivKey using NBitcoin

From what I see in the code ...READ MORE

Apr 7, 2022 in Blockchain by Aditya
• 7,680 points
808 views
0 votes
1 answer

Hyperledger composer: How to include relationship in custom query?

You are trying to use filter={"include":"resolve"} in Composer Query. ...READ MORE

Nov 16, 2018 in Blockchain by Omkar
• 69,190 points
808 views
0 votes
1 answer

Changing block time on Quorum.

They are two commands you can use ...READ MORE

Jun 27, 2018 in Blockchain by Omkar
• 69,190 points
806 views
0 votes
1 answer

Error in sending value to an Ethereum Smart Contract.

It is stated in Solidity 4.0 documentation ...READ MORE

Jul 23, 2018 in Blockchain by Perry
• 17,100 points
804 views