Trending questions in Blockchain

+1 vote
1 answer

Where to download the corda network bootstrapper 3.1 or 3.2 version for r3 corda?

Here are the steps to setup corda ...READ MORE

Jun 24, 2019 in Blockchain by Raghu
 • 714 views
0 votes
2 answers

How to get notified when an event triggers on ethereum smart contract?

Muchas gracias. ?Como puedo iniciar sesion? READ MORE

May 2, 2020 in Blockchain by aqowcmbevs
 • 2,182 views
0 votes
1 answer

Module not found: Can't resolve './truffle-contract/build/contracts

Hey! Firstly, there seems to be a ...READ MORE

May 9, 2019 in Blockchain by Omkar
 • 69,230 points • 2,738 views
0 votes
0 answers

Is there any API for ether sent transaction in ethereum without using web3.js

I want to do a transaction (sent ...READ MORE

Jun 17, 2019 in Blockchain by vishal tyagi
 • 1,072 views
0 votes
1 answer

Symmetric key in cryptography

Yes, the same key is used to ...READ MORE

Jun 20, 2019 in Blockchain by Firoz
 • 894 views
0 votes
1 answer

Using public and private keys for Blockchain transaction

You need to provide the receiver's public ...READ MORE

Jun 20, 2019 in Blockchain by Will
 • 869 views
0 votes
1 answer

ERROR: for cli UnixHTTPConnectionPool(host='localhost, port=None) Read time out log_timeout_error()

Can't give proper solution without knowing what ...READ MORE

May 15, 2019 in Blockchain by Rishi
 • 2,285 views
0 votes
1 answer

If everybody on the network stores a copy of the ledger, can't someone distribute an infected ledger and thus spread viruses etc?

Hi @Noa! Even if everyone has a copy ...READ MORE

Jun 19, 2019 in Blockchain by Lisa
 • 773 views
0 votes
0 answers

How do we increase the amount of gas?

Jun 25, 2019 in Blockchain by Neha Agarwal
 • 581 views
0 votes
0 answers

Network Parameter and additional node info file in R3 corda?

Is that network parameter and additional node ...READ MORE

Jun 21, 2019 in Blockchain by anonymous
 • 606 views
+1 vote
8 answers

How to solve “x509: ECDSA verification failure” error?

Before you execute the  composer runtime install -c ...READ MORE

Jul 30, 2018 in Blockchain by digger
 • 26,740 points • 8,195 views
0 votes
0 answers

how can i integrate fog computing simulation tools and Blockchain for research purpose

Jun 21, 2019 in Blockchain by anonymous
 • 120 points • 450 views
0 votes
1 answer

How can i import the csv/excel files into my contract and record the transaction ?

You can not directly import an excel/csv ...READ MORE

Apr 16, 2019 in Blockchain by Omkar
 • 69,230 points • 3,148 views
+1 vote
2 answers

Integrating web3 from Metamask: "ReferenceError: window is not defined" error

You can't use MetaMask on server-side because ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,230 points • 6,642 views
0 votes
1 answer

Trying to implement block-chain payment in website

There are many plugins that you can ...READ MORE

Jun 11, 2019 in Blockchain by Tina
 • 557 views
0 votes
4 answers

Hyperledger: byfn.sh up: ERROR !!! FAILED to execute End-2-End Scenario.

Try these commands $ docker rm -f $(docker ...READ MORE

Nov 28, 2018 in Blockchain by kartik chauhan
 • 6,033 views
0 votes
1 answer

Unable to bring up first network in hyperledger fabric

I think there's a conflict with docker ...READ MORE

May 2, 2019 in Blockchain by Karan
 • 2,179 views
0 votes
0 answers

how to create a kafka broker in hyperledger fabric what are the files needed to modify in hyperledger fabric version 1.4 also say step by step commands

Jun 12, 2019 in Blockchain by rumaise
 • 418 views
0 votes
1 answer

Decentralisation and Smart contract

Hey, @Vijayaprasad! The decentralization in Blockchain refers ...READ MORE

Jun 6, 2019 in Blockchain by Omkar
 • 69,230 points • 611 views
0 votes
1 answer

How to install truffle on Linux?

You can install Truffle using npm(node package manager). ...READ MORE

Feb 28, 2019 in Blockchain by Rishab
 • 4,690 views
0 votes
1 answer

What is the use of role when registering user in Hyperledger Fabric

When you register a user, that user ...READ MORE

May 2, 2019 in Blockchain by Raj
 • 1,952 views
0 votes
1 answer

How to Delete All Cars form hyperledger Fabric and modify its arguments the chaincode and set the path to existing folder of chaincode

First, you will have to make changes ...READ MORE

Mar 25, 2019 in Blockchain by Kiran
 • 3,611 views
+1 vote
4 answers

Hyperledger Fabric: Failed to enroll admin: Error: Failed to enroll admin.

As your .hfc-key-store directory is in chaindev, Try running the following ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,230 points • 5,415 views
+1 vote
3 answers

Hyperledger Fabric: How to delete installed chaincode ?

One way to do it, that I ...READ MORE

Nov 19, 2018 in Blockchain by Omkar
 • 69,230 points • 5,021 views
0 votes
0 answers

Corda - How to check if counter party nodes are running?

0 I have build a CorDapp using "Yo!CorDapp" ...READ MORE

May 28, 2019 in Blockchain by Sriram
 • 160 points • 524 views
+1 vote
1 answer

How the data stored in the blockchain is verified?

Hey @mayukha. When a transaction is is ...READ MORE

May 21, 2019 in Blockchain by Rajendra
 • 684 views
0 votes
1 answer

Truffle migrate: Error: You must specify a network_id in your 'development' configuration in order to use this network.

You have to mention the network id ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,230 points • 7,570 views
0 votes
0 answers

Corda - How to check if counter party nodes are running?

I have build a CorDapp using "Yo!CorDapp" ...READ MORE

May 28, 2019 in Blockchain by Sriram
 • 160 points • 350 views
0 votes
1 answer

Multichain installation error

Please follow the below steps to install ...READ MORE

May 22, 2019 in Blockchain by Wasim
 • 504 views
0 votes
4 answers

Hyperledger fabric: enrollAdmin.js Error: Cannot find module 'fabric-client'

Change your directory to fabric-samples/fabrcar. And run: npm ...READ MORE

Nov 21, 2018 in Blockchain by Omkar
 • 69,230 points • 4,662 views
0 votes
3 answers

Solidity: TypeError: Data location must be "memory" for parameter in function, but none was given.

Could be a version problem. This worked ...READ MORE

May 1, 2019 in Blockchain by Yogi
 • 4,276 views
+1 vote
5 answers

Where does the smart contracts stored and executed on blockchain?

Ethereum smart contracts are executed on EVM ...READ MORE

May 3, 2018 in Blockchain by Shashank
 • 10,400 points • 8,865 views
0 votes
0 answers

What will happen to the transactions with unconsumed states when modified contract is integrated in the network?

I have build a CorDapp using "Yo!CorDapp" ...READ MORE

May 23, 2019 in Blockchain by Sriram
 • 160 points • 427 views
+1 vote
3 answers

How to solve “Module not found: Error: Can't resolve 'truffle-contract'” error in web3?

Try compiling and migrating the contract: $ truffle ...READ MORE

Apr 30, 2019 in Blockchain by Rachita
 • 7,154 views
+1 vote
2 answers

Challenge while setting up Hyperledger Fabric 1.0 in Ubuntu 16.04

The rocksdb error you're seeing wouldn't be ...READ MORE

Mar 27, 2018 in Blockchain by ned_crew
 • 1,610 points
edited Jun 8, 2020 by Sirajul • 943 views
0 votes
1 answer

"Migrations" exceeded the block limit (with a gas value you set).

In the error you have posted, in ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,230 points • 5,587 views
0 votes
4 answers

Issue with getting web3.eth.accounts (MetaMask)

I solved problem, using: web3.eth.getAccounts((err, res) => ...READ MORE

Oct 12, 2018 in Blockchain by Perry
 • 17,100 points • 5,030 views
0 votes
1 answer

Solidity error: SyntaxError: No visibility specified.

As mentioned in the error, you have ...READ MORE

Dec 12, 2018 in Blockchain by Omkar
 • 69,230 points • 6,892 views
0 votes
4 answers

Hyperledger Fabric: Error: 2 UNKNOWN: access denied: channel [contentbackchainchannel] creator org

Run the following command inside fabric-tools folder: ./teardownFabric.sh ./startFabric.sh ./createPeerAdminCard.sh Then ...READ MORE

Oct 29, 2018 in Blockchain by Omkar
 • 69,230 points • 4,677 views
+1 vote
1 answer

truffle compile

Try running the truffle commands as root. ...READ MORE

May 9, 2019 in Blockchain by Omkar
 • 69,230 points • 445 views
+1 vote
2 answers

Hyperledger Composer: "No version of composer-cli has been detected" after global installation

I am also facing a similar issue, ...READ MORE

Sep 20, 2019 in Blockchain by sam
 • 160 points • 1,531 views
0 votes
1 answer

Not able to connect to Ethereum client.

There is another way to link it. ...READ MORE

Apr 28, 2019 in Blockchain by Aashish Pasricha
 • 892 views
+2 votes
3 answers

Hyperledger Fabric: How to run node js chaincode in dev mode?

Hi, the command you are using to ...READ MORE

Nov 2, 2018 in Blockchain by Omkar
 • 69,230 points • 4,188 views
–1 vote
1 answer

Not able to use geth attach

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

Jan 17, 2019 in Blockchain by Omkar
 • 69,230 points • 4,990 views
0 votes
2 answers

Truffle compile: SyntaxError: No visibility specified. Did you intend to add "public"?

You can try another method : contract HelloWorld{       function ...READ MORE

Mar 18, 2019 in Blockchain by anonymous
 • 3,616 views
0 votes
1 answer

Truffle can not find artifacts error

To deploy any project/ smart contract, you ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
 • 69,230 points • 4,656 views
+1 vote
5 answers

Difference between internal-external, private-public in function

External: These functions are part of the ...READ MORE

Apr 8, 2018 in Blockchain by Shashank
 • 10,400 points • 8,561 views
0 votes
1 answer

geth: Fatal: invalid genesis file: invalid character 'â' looking for beginning of object key string

Looks like your editor is adding characters ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,230 points • 6,686 views
0 votes
1 answer

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 • 1,269 views
0 votes
1 answer

How to install Ethereum on Windows?

Download geth installer from https://geth.ethereum.org/downloads/ After download, run ...READ MORE

Feb 28, 2019 in Blockchain by Raj
 • 2,991 views
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