Most viewed questions in Blockchain

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1 answer

Web-scraping from Coinbase with Python (Pycharm)

Data that you want to scrape is ...READ MORE

Sep 4, 2018 in Blockchain by digger
• 26,740 points
2,350 views
+1 vote
2 answers

How to configure Endorsement policy in Hyperledger?

The Hyperledger Fabric Endorsement policy is configured ...READ MORE

Jul 25, 2018 in Blockchain by slayer
• 29,330 points
2,345 views
0 votes
1 answer

HyperLedger Fabric and Multichain - difference & different use cases

MULTICHAIN: It is a Permissioned Blockchain. It doesn't implement ...READ MORE

Dec 28, 2018 in Blockchain by Omkar
• 69,190 points
2,333 views
0 votes
1 answer

Where is the cryptogen tool in fabric?

Go in the fabric directory and then ...READ MORE

Oct 29, 2018 in Blockchain by Omkar
• 69,190 points
2,317 views
+1 vote
1 answer

Which data structure to prefer to model a blockchain?

To start with, let me tell you ...READ MORE

Apr 21, 2018 in Blockchain by Perry
• 17,100 points
2,299 views
+1 vote
4 answers

Trying to connect to Cryptocompare's websocket stream using socketIO from a Python client

The reason might be that the the socketio ...READ MORE

Aug 6, 2018 in Blockchain by Perry
• 17,100 points
2,298 views
0 votes
1 answer

Converting 5e-08 to decimal in PHP

Use printf with the appropriate format specifier: printf("%.8f", 5 / ...READ MORE

Sep 12, 2018 in Blockchain by digger
• 26,740 points
2,281 views
+1 vote
1 answer

How to write an ERC 721 contract?

You could go through the following links:  https://github ...READ MORE

Jun 28, 2018 in Blockchain by Perry
• 17,100 points
2,281 views
0 votes
1 answer

How to get all address and send ethers in solidity using a loop?

I found a similar code somewhere: contract  Holders{ uint ...READ MORE

Jul 31, 2018 in Blockchain by digger
• 26,740 points
2,269 views
+6 votes
3 answers

Why don't we consider Git as a Blockchain?

Blockchain is not just any chain of any blocks. Blockchain is when there ...READ MORE

Sep 7, 2018 in Blockchain by Rowski
2,256 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
2,248 views
0 votes
1 answer

How to set the hex-encoded data field in a Web3j Ethereum transaction?

You can use the "data" field of ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
• 69,190 points
2,241 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
2,241 views
0 votes
1 answer

Generate Ethereum addresses in HD Wallet using public key only (bitcoinj/web3j)

Like Bitcoin, Ethereum uses secp256k1. Ethereum addresses ...READ MORE

Apr 12, 2022 in Blockchain by Soham
• 9,700 points
2,237 views
0 votes
3 answers

String conversion to Array in Solidity

There is no built-in method/function for this ...READ MORE

Oct 3, 2018 in Blockchain by Charlie
2,235 views
+1 vote
4 answers

What is the asset, key-value pair in hyperledger fabric?

Let me explain with an example. Suppose ...READ MORE

May 2, 2019 in Blockchain by Kiran
2,234 views
0 votes
1 answer

How to get IP address of peer connected in private ethereum network?

To get these details, you can use ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
• 69,190 points
2,228 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
• 69,190 points
2,221 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
• 29,330 points
2,217 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
• 7,450 points
2,212 views
+1 vote
1 answer

Hyperledger fabric java sdk setup

Suppose (assuming) you started the first network ...READ MORE

Nov 17, 2018 in Blockchain by Christine
• 15,790 points
2,192 views
0 votes
1 answer

Cant get a specific value in JSON/PHP

Convert the json-string to a php-array and ...READ MORE

Sep 11, 2018 in Blockchain by slayer
• 29,330 points
2,191 views
0 votes
2 answers

UnicodeDecodeError: 'utf-8' codec can't decode byte (python)

I found a python rpc library for ...READ MORE

Sep 4, 2018 in Blockchain by Piston
2,186 views
0 votes
1 answer

How to convert byte array to hex string?

You are missing the padding in the ...READ MORE

Aug 17, 2018 in Blockchain by slayer
• 29,330 points
2,170 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
• 69,190 points
2,165 views
0 votes
1 answer

Solidity Error: Exceeds block gas limit

Remove the line norpc:true and change the ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,190 points
2,160 views
0 votes
2 answers

How to use multiple anchor peers in an organization?

To use multiple anchor peers, you need ...READ MORE

Jul 10, 2018 in Blockchain by digger
• 26,740 points
2,159 views
+1 vote
2 answers

How to return value from a chaincode in Hyperledger Fabric?

Hyperledger Fabric supports only 2 types of ...READ MORE

Jun 13, 2018 in Blockchain by Perry
• 17,100 points
2,149 views
+1 vote
4 answers

Where does hyperledger fabric store the database for the blockchain?

The data of the Hyperledger Blockchain is ...READ MORE

Apr 29, 2019 in Blockchain by Tina
2,147 views
–1 vote
1 answer

How to connect two different nodes in private ethereum network?

To connect two nodes, you can use ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
• 69,190 points
2,138 views
0 votes
1 answer

How to interact with smart contract in GO?

I am providing an example. Modify it ...READ MORE

Jul 26, 2018 in Blockchain by digger
• 26,740 points
2,127 views
0 votes
1 answer

Cannot access web3 object with typescript and ethereum

You still need to instantiate it first. ...READ MORE

Sep 25, 2018 in Blockchain by slayer
• 29,330 points
2,105 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
• 29,330 points
2,104 views
+1 vote
1 answer

how to create channels with new orgs in Fabric? getting error: Attempted to include a member which is not in the consortium.

$: peer channel fetch config config_block.pb -o ...READ MORE

Jul 24, 2019 in Blockchain by Ayush
• 180 points
2,102 views
0 votes
1 answer

How to retrieve data from an Ethereum Block?

To get transaction details like Block Hash ...READ MORE

Jul 19, 2018 in Blockchain by Perry
• 17,100 points
2,095 views
0 votes
1 answer
0 votes
1 answer

How to call a payable contract function from truffle console?

You can use a contract function, on ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,190 points
2,087 views
0 votes
1 answer

How do I withdraw the balance from a contract on Ethereum test blockchain?

Your need to improvise your code a ...READ MORE

Aug 3, 2018 in Blockchain by Perry
• 17,100 points
2,078 views
+1 vote
4 answers

What role does Orderer peer serves in Hyperledger Fabric??

Shared communication channel to clients and peers ...READ MORE

Apr 12, 2018 in Blockchain by Johnathon
• 9,090 points
2,072 views
0 votes
1 answer

Hyperledger — how to set up REST API for invoking Chaincode?

Hyperledger Fabric v1.0 and later does not ...READ MORE

Nov 17, 2018 in Blockchain by Christine
• 15,790 points
2,069 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
2,041 views
0 votes
1 answer

Solidity Web3js: Invalid number of arguments to Solidity function error

Try this: Change console.log(formData.destinationtoke); console.log(formData.amounttoke); var tx = sendtoken(destinationtoke, amounttoke); To : console.log(formData.destinationtoke); console.log(formData.amounttoke); var ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
• 69,190 points
2,038 views
0 votes
1 answer

How can I create an online wallet without any 3rd party API on my PHP server?

With any approach, you need a bitcoin ...READ MORE

Aug 30, 2018 in Blockchain by Perry
• 17,100 points
2,021 views
0 votes
1 answer

TestRPC/Ganache: the transaction doesn't have the correct nonce

Using MetaMask v3.14.1 you can reset your account as ...READ MORE

Nov 15, 2018 in Blockchain by Perry
• 17,100 points
2,009 views
0 votes
1 answer

Hyperledger Composer: Error: Error trying to start business network. Error: No valid responses from any peers.

You have to configure TLS in peers ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
• 69,190 points
2,009 views
+1 vote
1 answer

How does a miner get to know that a transaction is verified by all the nodes?

Contrary to the popular belief, it is ...READ MORE

Mar 27, 2018 in Blockchain by Johnathon
• 9,090 points
2,006 views
0 votes
2 answers

Check Bitcoin Balance with mybitx api https GET url

You can use the PHP Requests library for an ...READ MORE

Sep 17, 2018 in Blockchain by Lalit
1,995 views
0 votes
1 answer

How to manually create the instance of the contract in truffle?

You can try to do it like ...READ MORE

Sep 24, 2018 in Blockchain by slayer
• 29,330 points
1,981 views
0 votes
1 answer

How can I deploy a HelloWorld contract on my testrpc network?

The problem lies in the command: truffle migrate Your truffle migrate command ...READ MORE

Apr 27, 2018 in Blockchain by Perry
• 17,100 points

edited Aug 10, 2018 by Omkar 1,967 views
0 votes
1 answer

Why am I not getting 100 ethers in my metamask account?

Sorry that you're having this problem. To ...READ MORE

Jun 14, 2018 in Blockchain by Christine
• 15,790 points
1,964 views