Most viewed questions in Blockchain

0 votes
1 answer

How to register a user in Hyperledger Fabric?

Best practice would be to leverage an ...READ MORE

Sep 5, 2018 in Blockchain by Christine
 • 15,790 points • 1,711 views
0 votes
1 answer

Hyperledger Fabric: How to retrieve result from Fabric Transaction?

invokeChainCode(securityContext, functionName, args, options) { ...READ MORE

Nov 8, 2018 in Blockchain by Omkar
 • 69,230 points • 1,708 views
0 votes
1 answer

Ethereum nodejs: Contract address returning as undefined in console

As per the documentation, if you deploy the ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,705 views
–1 vote
1 answer

Miner in Ethereum Private network is hanging

Looking at your commands again, I figured ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,230 points • 1,702 views
0 votes
1 answer

Hyperledger Fabric: Error endorsing chaincode: rpc error

Run the following commands and try again: docker ...READ MORE

Oct 31, 2018 in Blockchain by Omkar
 • 69,230 points • 1,701 views
+2 votes
1 answer

What are the wallet path credentials for Web3j?

Follow the below steps: Go to the private ...READ MORE

Aug 2, 2018 in Blockchain by Omkar
 • 69,230 points • 1,688 views
0 votes
1 answer

Invalid method parameters for eth_sendTransaction

params needs to be an array, try {"jsonrpc":"2.0","method":"eth_se ...READ MORE

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 1,683 views
–1 vote
1 answer

How to add a static node to private ethereum network?

There are two ways to do this. 1. Configuring ...READ MORE

Jan 11, 2019 in Blockchain by Omkar
 • 69,230 points • 1,681 views
0 votes
1 answer

What is the difference between hashing and encryption process?

Hashing and encryption are same but not ...READ MORE

Dec 4, 2018 in Blockchain by Omkar
 • 69,230 points • 1,675 views
0 votes
2 answers

Code to change owner

Hi, @Wilson, U have to write the require ...READ MORE

Oct 5, 2020 in Blockchain by Rajiv
 • 8,910 points • 1,673 views
+11 votes
4 answers

How do I create an ether wallet?

The Ethereum Wallet is a gateway to decentralized applications ...READ MORE

Sep 14, 2018 in Blockchain by Shiva
 • 1,672 views
0 votes
1 answer

Go build fail, fatal error: rocksdb/c.h

I followed here and it is done. https://github.com/openblockchain/obc-peer/issues/885 Configure ...READ MORE

Sep 17, 2018 in Blockchain by slayer
 • 29,360 points • 1,666 views
0 votes
1 answer

How to create users on hyperledger and how to assign policies to the created users?

First the users need to establish identity ...READ MORE

Jul 10, 2018 in Blockchain by slayer
 • 29,360 points • 1,666 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 • 1,664 views
+1 vote
3 answers

What is the pattern for handling throw on a Solidity contract in tests

In my opinion the cleanest way is: it("should ...READ MORE

Sep 25, 2018 in Blockchain by Lupin
 • 1,653 views
0 votes
1 answer

Hyperledger Docker: Error building images: cannot connect to Docker endpoint.

Check your container environment variable: CORE_VM_ENDPOINT=unix:///var/run/docker.sock Then if you ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,649 views
+1 vote
2 answers

how to fetch data from excel (which has some 100 data)or csv file and use that bulk data in smart contract and validate

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

Oct 30, 2019 in Blockchain by Tina
 • 1,646 views
0 votes
0 answers

Couldn't find network parameters file and compatibility zone wasn't configured/isn't reachable

After ran this command java -jar network-bootstrapper-VERSION.jar --dir <nodes-root-dir>.The files is generated.After ...READ MORE

Jun 20, 2019 in Blockchain by anonymous
 • 1,644 views
+4 votes
2 answers

Warning: Invoking events without “emit” prefix is deprecated while truffle compile

As the warning mentions, add emit as ...READ MORE

Oct 16, 2018 in Blockchain by Aisha
 • 1,644 views
0 votes
1 answer

Send Payment error in Blockchain API

The following code should help: $address = null; try ...READ MORE

Jul 6, 2018 in Blockchain by Perry
 • 17,100 points • 1,644 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 • 1,642 views
0 votes
1 answer

Solidity: logical AND outputs parser error

Its Syntax error logical and operator is ...READ MORE

Oct 12, 2018 in Blockchain by Perry
 • 17,100 points • 1,639 views
0 votes
1 answer

How to select a single account in Ganache?

When you use web3, selecting a single ...READ MORE

Feb 5, 2019 in Blockchain by Omkar
 • 69,230 points • 1,635 views
+1 vote
0 answers

Error 500 during instantiation of chaincode for commercial-paper example. [closed]

I am following this tutorial on setting ...READ MORE

Jan 9, 2020 in Blockchain by Aditya
 • 250 points
reshown Jan 9, 2020 by Kalgi • 1,634 views
+1 vote
1 answer

Error while sending a transaction from Web3py to a Smart Contract in Remix

You get the revert error when a ...READ MORE

Dec 12, 2019 in Blockchain by Vivek
 • 1,634 views
0 votes
1 answer

How do transactions create a new block in Blockchain?

Bitcoin puts a cap of 2,400 transactions ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 1,631 views
0 votes
1 answer

How to check history of blockchain.info wallet?

In the link you mentioned(https://blockchain.info/q), there are ...READ MORE

Jul 23, 2018 in Blockchain by slayer
 • 29,360 points • 1,631 views
+1 vote
1 answer

What is the best way to search for an item in blockchain?

All transactions and records in blockchain are ...READ MORE

Apr 21, 2018 in Blockchain by Perry
 • 17,100 points • 1,630 views
0 votes
2 answers

Laravel 5.4 to get data form API response

Input::get('var_name') READ MORE

Feb 14, 2019 in Blockchain by anonymous
 • 1,629 views
0 votes
1 answer

How can I call a contract from another contract?

There are two ways to solve this. ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 69,230 points • 1,626 views
0 votes
1 answer

How to get Node URL in private ethereum network?

You have already noticed that  admin.peers does ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
 • 69,230 points • 1,626 views
0 votes
1 answer

Hyperledger Fabric: PEM encoded certificate is required.

Hey, the syntax you are using is ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,230 points • 1,624 views
0 votes
3 answers

How to create a cryptocurrency based reward system using Ethereum?

Hey, you can take the help of ...READ MORE

Oct 28, 2020 in Blockchain by jamesright
 • 140 points • 1,620 views
0 votes
1 answer

Can I make my smart contract private in Quorum?

Yes, it is possible. You can look ...READ MORE

Jul 23, 2018 in Blockchain by slayer
 • 29,360 points • 1,618 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 • 1,613 views
0 votes
1 answer

Is it possible to send eth to a contract through its constructor from another contract?

I found the solution for this: pragma solidity ...READ MORE

Sep 26, 2018 in Blockchain by slayer
 • 29,360 points • 1,608 views
0 votes
1 answer

How to ensure data privacy in Hyperledger Fabric?

There are different ways data privacy in ...READ MORE

Jan 31, 2019 in Blockchain by Omkar
 • 69,230 points • 1,607 views
0 votes
1 answer

Accessing External Api in HyperLedger Fabric

Generally you are not supposed to call ...READ MORE

Nov 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,599 views
0 votes
2 answers

Creating a private/public key with 64 characters that are already known using bitcoinjs

//public-key var address = eckey.getBitcoinAddress().toString(); var privateKeyBytesCompressed = privateKeyBytes.slice(0); ...READ MORE

Sep 10, 2018 in Blockchain by Misty
 • 1,593 views
0 votes
1 answer

GetState query via chaincode always returns empty value

fabric uses an ccenv image to build the chaincode when ...READ MORE

Jul 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,590 views
0 votes
1 answer

How do I start mining on my private chain?

You could try deleting the datadir/.etash and ...READ MORE

Jul 13, 2018 in Blockchain by Christine
 • 15,790 points • 1,588 views
0 votes
1 answer

PHP IPC with geth Ethereum: How to communicate with client?

You have to use PHP Sockets $sock = socket_create(AF_UNIX, ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,230 points • 1,581 views
0 votes
1 answer

How to get account with ethers by default in ethereum private network?

Have you created an account before allocating ...READ MORE

Jan 9, 2019 in Blockchain by Omkar
 • 69,230 points • 1,576 views
0 votes
1 answer

Connection failed to Ethereum Ropsten Testnet network.

 It looks like your node isn't syncing ...READ MORE

Mar 27, 2018 in Blockchain by Christine
 • 15,790 points • 1,575 views
0 votes
1 answer

In Ethereum Solidity, what is the purpose of the “memory” keyword?

Without the memory keyword, Solidity tries to declare variables ...READ MORE

Nov 15, 2018 in Blockchain by Perry
 • 17,100 points • 1,567 views
0 votes
1 answer

How to extract Ethereum Blockchain data?

You are using web3.eth.getTransaction(txHash) web3.eth.getTransaction(txHash) will only return info ...READ MORE

Jul 30, 2018 in Blockchain by slayer
 • 29,360 points • 1,564 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 • 1,563 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 • 1,560 views
0 votes
1 answer

Error: Error trying to ping. Error: Error trying to query business network. Error: Connect Failed

Run the following commandbefore updating: composer network start ...READ MORE

Jun 28, 2018 in Blockchain by Perry
 • 17,100 points • 1,560 views
0 votes
1 answer

Ethereum solidity: Unable to get value from another contract

I have faced similar issues when compiling ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,230 points • 1,555 views
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