Trending questions in Blockchain

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How can i integrate Omnet++ with ethereum ?? or is there any other simulator which can do this??

You can use Hive Validator. Using this, you ...READ MORE

Apr 9, 2019 in Blockchain by Omkar
• 69,230 points
1,323 views
0 votes
1 answer

Solidity ParserError: Expected identifier but got '='

Hey, the solidity grammar doesn't allow assignments ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
• 69,230 points
9,095 views
+2 votes
3 answers

Hyperledger Fabric: Peer Connection error: Failed obtaining connection: Could not connect to any of the endpoints.

 You can extend your /etc/hosts file and make orderer.example.com domain name ...READ MORE

Nov 13, 2018 in Blockchain by Omkar
• 69,230 points
3,624 views
0 votes
1 answer

Installing Solidity on Linux

You can install Solidity Compiler on Linux ...READ MORE

Feb 28, 2019 in Blockchain by Reshma
2,873 views
0 votes
3 answers

How to solve “VM Exception while processing transaction: revert” error?

I am using windows 7. Any solution ...READ MORE

Apr 30, 2019 in Blockchain by Rajesh
6,159 views
0 votes
1 answer

Install testrpc on Windows

You can not directly install testrpc on ...READ MORE

Feb 28, 2019 in Blockchain by Piyush
2,815 views
+1 vote
2 answers

Hyperledger fabric: Error: got unexpected status: FORBIDDEN -- Failed to reach implicit threshold of 1 sub-policies

Try  ./byfn.sh -m down and then ./byfn.sh -m up READ MORE

Nov 5, 2018 in Blockchain by Omkar
• 69,230 points
5,956 views
+1 vote
2 answers

How to get airdropped tokens to Ethereum wallet?

You also can use Frewallet This wallet is ...READ MORE

Dec 20, 2019 in Blockchain by anonymous
• 160 points
917 views
+1 vote
2 answers

How to convert INT to STRING in Solidity?

Look at the following code : function uintToString(uint ...READ MORE

Jun 27, 2018 in Blockchain by Christine
• 15,790 points
11,901 views
0 votes
2 answers

Hyperledger Composer: Adding a new peer: failed to create a new connection: context deadline exceeded.

Seems like peer address problem. Set the ...READ MORE

May 6, 2019 in Blockchain by Tina
3,549 views
+2 votes
3 answers

What are the functions of the Fabric CA Server and Fabric CA Client?

You need to setup the Fabric CA ...READ MORE

Aug 25, 2018 in Blockchain by Perry
• 17,100 points
5,159 views
+1 vote
3 answers

How to resolve the hyperledger fabric versions set up?

How to simple way to upgrade the ...READ MORE

Dec 18, 2018 in Blockchain by anonymous
2,456 views
0 votes
0 answers

Error: Unexpected token o in JSON at position 1

I have been working with Interacting a ...READ MORE

Mar 6, 2019 in Blockchain by saeedi
• 120 points

edited Mar 6, 2019 by Omkar 2,269 views
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1 answer

Solidity, why the used function is placed before the brace "{}" when define a new function?

Hey there! 1. Yes, using the same name ...READ MORE

Apr 4, 2019 in Blockchain by Omkar
• 69,230 points
976 views
0 votes
2 answers

Hyperledger Fabric: Channel creation failed! FAILED to execute End-2-End Scenario

This error usually occurs if some old ...READ MORE

May 8, 2019 in Blockchain by John
3,050 views
+1 vote
1 answer

Permission is denied in Oracle VM when trying to move multichain util, multichaind and multichain-cli from tmp to /usr/local/bin

You will need root permissions to move a file ...READ MORE

Apr 8, 2019 in Blockchain by Omkar
• 69,230 points
651 views
+1 vote
4 answers

How PBFT algorithm works?

PBFT is a way for a distributed ...READ MORE

Apr 25, 2019 in Blockchain by Kiran
7,802 views
0 votes
1 answer

Hyperledger Fabric: “Local Fabric binary version does not match this newer version of BYFN and is unsupported”.

You need to first delete the existing ...READ MORE

Nov 19, 2018 in Blockchain by Omkar
• 69,230 points
6,679 views
0 votes
1 answer

How to reintialize genesis block in geth ethereum?

You are getting this error because you ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
• 69,230 points
5,977 views
0 votes
2 answers

What is the difference between full node and partial node?

We need different types of nodes to ...READ MORE

May 31, 2019 in Blockchain by Sourav kumar
5,251 views
0 votes
1 answer

JavaFX Location is not set error message

I had this problem and found this ...READ MORE

Sep 19, 2018 in Blockchain by slayer
• 29,350 points
9,255 views
0 votes
1 answer

"Migrations" -- Returned error: authentication needed: password or unlock.

By default, the accounts are locked and ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
4,057 views
0 votes
0 answers

How to set chaincode path in Hyperledger Fabric in fabric.sh file

i set the path to chaincode in ...READ MORE

Mar 23, 2019 in Blockchain by Malik

retagged Mar 25, 2019 by Omkar 1,200 views
0 votes
1 answer

Truffle "Migrations" ran out of gas error

This error is caused because the amount ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,932 views
0 votes
1 answer

Hyperledger error-installation error

Hey, there is a thread for the ...READ MORE

Apr 5, 2019 in Blockchain by Omkar
• 69,230 points
509 views
0 votes
1 answer

How to install metamask?

MetaMask is a browser plugin, you install ...READ MORE

Feb 28, 2019 in Blockchain by Lakhan
2,053 views
+1 vote
3 answers

Hyperledger Java SDK Client Event Listener to register and listen Blocks

First add the eventhub, and then  register ...READ MORE

Oct 29, 2018 in Blockchain by Omkar
• 69,230 points
3,060 views
0 votes
2 answers

Truffle compile/migrate not working

In my case, use sudo command. truffle compile ...READ MORE

Feb 20, 2019 in Blockchain by byoul
2,580 views
+1 vote
1 answer

How to install Hyperledger Composer on Linux?

You need some pre-requisites to install Hyperledger ...READ MORE

Mar 1, 2019 in Blockchain by Avanti
1,915 views
0 votes
1 answer

how to get the information of asset created in hyperledger composer in case of with out transaction?

First, get the list of all existing ...READ MORE

Mar 13, 2019 in Blockchain by Omkar
• 69,230 points
1,407 views
+1 vote
0 answers

cryptogen: error: open ./crypto-config.yaml: The system cannot find the file specified [closed]

I created a generate.sh to generate crypto ...READ MORE

Mar 1, 2019 in Blockchain by Tharindu
• 170 points

closed Mar 1, 2019 by Tharindu 1,926 views
–1 vote
1 answer

Not able to install truffle

I know this is very frustrating, I ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,753 views
0 votes
1 answer

How to install Ethereum Blockchain on Linux?

To install Ethereum on Linux, open the ...READ MORE

Feb 28, 2019 in Blockchain by Kruti
1,900 views
0 votes
3 answers

Querying past transaction data from Hyperledger Fabric.

You can use shim function and query ...READ MORE

Apr 26, 2019 in Blockchain by Shaheen
5,871 views
0 votes
0 answers

how to add path of chain code in hyperledger fabric in startfabric.sh

#!/bin/bash # # Copyright IBM Corp All Rights Reserved # # ...READ MORE

Mar 17, 2019 in Blockchain by anonymous
1,120 views
0 votes
1 answer

Extract data from Json url result php

Try this code, it worked for me: $balance ...READ MORE

Sep 3, 2018 in Blockchain by slayer
• 29,350 points
9,452 views
–1 vote
1 answer

How to get pending transaction in geth?

You can check the pending transactions using ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,624 views
0 votes
1 answer

Hyperledger Fabric: How to Parse arrays in req.body in node js express?

You can get the value from the ...READ MORE

Nov 16, 2018 in Blockchain by Kavya
6,232 views
0 votes
0 answers

Hyperledger Fabric: Errors in Deliver and Broadcast services

Hello, I have create successfully a multi-org, ...READ MORE

Feb 22, 2019 in Blockchain by Cha
2,040 views
0 votes
1 answer

How does the architecture of a blockchain search work?

Hey there! There is no architecture called ...READ MORE

Mar 28, 2019 in Blockchain by Suman
484 views
0 votes
0 answers

Cannot create genesis block?

When I try to create a genesis block ...READ MORE

Feb 27, 2019 in Blockchain by Tharindu
• 170 points

edited Feb 28, 2019 by Omkar 1,750 views
0 votes
1 answer

Truffle compile compilation failed

This is a version compatibility problem. In ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,465 views
0 votes
1 answer

How to set token price in solidity?

We know that 1 Ether = 1018 wei, ...READ MORE

Sep 25, 2018 in Blockchain by slayer
• 29,350 points
8,377 views
0 votes
1 answer

Can not open geth console: Fatal: Error starting protocol stack: listen tcp :30303: bind: address already in use

The default port for geth is 30303. ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
• 69,230 points
5,255 views
–1 vote
1 answer

Not able to create new account in geth for private ethereum blockchain

personal.newAccount() is not a default geth method. This ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
• 69,230 points
3,479 views
0 votes
1 answer

geth: Fatal: Error starting protocol stack: datadir already used by another process

It seems like geth is already running. ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
• 69,230 points
5,257 views
0 votes
2 answers

How to completely uninstall hyperledger composer?

You might have to uninstall/remove files from ...READ MORE

Aug 9, 2018 in Blockchain by slayer
• 29,350 points
4,757 views
+2 votes
3 answers

Blockchain and HyperLedger difference

Hey, you got it right! Blockchain is ...READ MORE

Sep 7, 2018 in Blockchain by Omkar
• 69,230 points
791 views
0 votes
1 answer

Where is default chaincode is located in pc?

The path that you have mentioned in ...READ MORE

Mar 25, 2019 in Blockchain by Omkar
• 69,230 points
470 views
0 votes
1 answer

Error while sending an address to functions

In solidity 0.5.0 (and above) there are ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
• 69,230 points
2,998 views