Most viewed questions in Blockchain

+1 vote
1 answer

Can there be multiple Hyperledger Fabric CA servers in the same blockchain?

Yes, you can run multiple CA servers ...READ MORE

Jun 27, 2018 in Blockchain by Omkar
• 69,220 points
2,335 views
0 votes
2 answers

web3 accounts coming undefined

Try this :  web3.eth.getAccounts() READ MORE

Jul 23, 2020 in Blockchain by Manas
• 150 points
2,329 views
0 votes
1 answer

Geth account password on command line

You've got the following two ways to create ...READ MORE

May 29, 2018 in Blockchain by Perry
• 17,100 points
2,317 views
0 votes
1 answer

Truffle dev says my function is not a function

It seems you are using truffle v5. ...READ MORE

Jan 24, 2019 in Blockchain by Omkar
• 69,220 points
2,309 views
0 votes
1 answer

Unable to enroll user in new org

The thing is by default, fabric-ca only has ...READ MORE

Aug 25, 2018 in Blockchain by Christine
• 15,790 points
2,308 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 4, 2022 in Blockchain by Soham
• 9,710 points
2,307 views
0 votes
1 answer

Ethereum call contract method that emits an event, from another contract

You need to refer to the EventEmitter by ...READ MORE

Sep 25, 2018 in Blockchain by digger
• 26,740 points
2,305 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
2,299 views
0 votes
1 answer

Unable to unmarshal non-string into Go struct field SendTxArgs from of common.Address

Probably you should specify the default_account for client(sender address). In my ...READ MORE

Aug 28, 2018 in Blockchain by Johnathon
• 9,090 points
2,291 views
0 votes
1 answer

Web3js: how to catch ethereum contract exception?

try this: try{ Test test = Test.load(contractObj.getContractAddress(), ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
• 69,220 points
2,289 views
0 votes
1 answer

How to create channels in Hyperledger Sawtooth?

There are two features that I know ...READ MORE

Aug 9, 2018 in Blockchain by slayer
• 29,370 points
2,283 views
0 votes
1 answer

How to interact with a Smart Contract on private network using Web3.js?

Once you set up infura you can ...READ MORE

Aug 22, 2018 in Blockchain by Christine
• 15,790 points
2,281 views
0 votes
1 answer

How can i extract information from Ethereum blockchain using python?

Give the RPC (--rpc) option when you ...READ MORE

Jul 31, 2018 in Blockchain by Shashank
• 10,400 points
2,278 views
0 votes
1 answer

Channel fails to create Hyperledger Fabric

Hi, @Sara, I guess this error is happening ...READ MORE

May 26, 2020 in Blockchain by Gitika
• 65,770 points
2,274 views
0 votes
1 answer

What is the use of Ethereum's RLPx in Ethereum ecosystem?

So, RLPx is a protocol suite. It ...READ MORE

Jun 5, 2018 in Blockchain by Johnathon
• 9,090 points
2,268 views
0 votes
1 answer

What is the difference between Blockchin and Bitcoin

Blockchain has potential beyond Bitcoin and cryptocurrency. ...READ MORE

Jul 13, 2018 in Blockchain by shweta
• 440 points
2,266 views
+1 vote
1 answer

How to perform a simple 1-to-1 Bitcoin Transaction with Bitcore?

What is the argument utxos int the ...READ MORE

Jul 20, 2018 in Blockchain by charlie_brown
• 7,720 points
2,261 views
0 votes
1 answer

yfinance Crypto symbol list

After what I know about, YahooFinance uses ...READ MORE

Mar 24, 2022 in Blockchain by Rahul
• 9,680 points
2,260 views
+1 vote
1 answer

Can't instantiate any chaincodes on peers of newly Added org

Seems like chaincode install may have been unsuccessful. Before ...READ MORE

Sep 20, 2018 in Blockchain by Perry
• 17,100 points
2,239 views
0 votes
1 answer

How to set web3 solidity variable value?

The setLog transaction has not yet been mined by ...READ MORE

Jul 6, 2018 in Blockchain by Christine
• 15,790 points
2,216 views
0 votes
1 answer

How to generate litecoin using pycoin?

In the secret_exponent_to_wif function def secret_exponent_to_wif(se, compressed): ...READ MORE

Aug 29, 2018 in Blockchain by digger
• 26,740 points
2,215 views
0 votes
1 answer

Can we find out the bitcoin sender by their address?

It is not possible to find the ...READ MORE

Dec 4, 2018 in Blockchain by Omkar
• 69,220 points
2,196 views
0 votes
1 answer

eth.getTransactionReceipt returns null

It looks like there's an issue with ...READ MORE

Sep 25, 2018 in Blockchain by slayer
• 29,370 points
2,191 views
0 votes
1 answer

Docker on mac error message can't connect to Docker endpoint

While CORE_VM_ENDPOINT set to unix:///var/run/docker.sock, please make ...READ MORE

Sep 19, 2018 in Blockchain by slayer
• 29,370 points
2,191 views
0 votes
1 answer

Hyperledger Fabric: How to create wallet using program?

You can do this by passing some ...READ MORE

Oct 31, 2018 in Blockchain by Omkar
• 69,220 points
2,182 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
2,181 views
+1 vote
1 answer

Can we copy a smart contract?

While the contract is open-source, if you ...READ MORE

Apr 7, 2018 in Blockchain by Christine
• 15,790 points
2,177 views
0 votes
1 answer

How to Query hdfs with Spark Sql

Yyou can achieve this by creating Dataframe. val ...READ MORE

Sep 20, 2018 in Blockchain by slayer
• 29,370 points
2,176 views
0 votes
1 answer

How to create light wallet in Web3J?

You can use this method to create ...READ MORE

Aug 10, 2018 in Blockchain by slayer
• 29,370 points
2,172 views
0 votes
1 answer

Ethereum smart contract event trigger notification

I have an example here for web3js ...READ MORE

Aug 1, 2018 in Blockchain by slayer
• 29,370 points
2,171 views
0 votes
2 answers

Modifiers in solidity

pragma solidity ^0.4.17; contract ModifiersTutorial { ...READ MORE

Oct 12, 2018 in Blockchain by Pulkit
2,169 views
0 votes
1 answer

How to see bitcoin transaction info?

You can view foreign transactions using bitcoind. Set txindex=1 in ...READ MORE

Aug 17, 2018 in Blockchain by digger
• 26,740 points
2,161 views
0 votes
1 answer

Private ethereum network account balance is zero

There are two reasons due to which ...READ MORE

Jan 28, 2019 in Blockchain by Omkar
• 69,220 points
2,160 views
+1 vote
1 answer

Why is it so difficult to find a nonce while validating a block in Bitcoin?

A nonce is just "some arbitrary number". In ...READ MORE

Apr 11, 2018 in Blockchain by Perry
• 17,100 points
2,156 views
0 votes
1 answer

PHP - Validate Multisig Bitcoin Wallet Address (with Leading 2 or 3)

 The answer to your question is given ...READ MORE

Apr 11, 2022 in Blockchain by Soham
• 9,710 points
2,152 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
2,149 views
0 votes
1 answer

How to join a peer to a channel in Hyperledger Fabric?

When you run the command: peer channel create ...READ MORE

Jul 31, 2018 in Blockchain by digger
• 26,740 points
2,149 views
0 votes
1 answer

safeTransferFrom does not transfer etherium to the target. ERC-721

I changed my contract buy function like ...READ MORE

Apr 7, 2022 in Blockchain by Rahul
• 9,680 points

edited Mar 13, 2023 by Gunashree 2,146 views
+2 votes
1 answer

Blockchain declining my API key and I cannot understand why.

It's quite easy. Request the API key using ...READ MORE

Apr 3, 2018 in Blockchain by Christine
• 15,790 points
2,145 views
0 votes
1 answer

Ethereum: functions Burn and Transfer source

This statement is used to publish an event that ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
• 69,220 points
2,142 views
0 votes
1 answer

Bitcoinjs-lib getAddress not a function error

You need to pass network parameter to ...READ MORE

Aug 27, 2018 in Blockchain by slayer
• 29,370 points
2,142 views
+1 vote
1 answer

How can I add image into my Hyperledger instance

In your registry, you can Base64-ify your ...READ MORE

Jun 8, 2018 in Blockchain by aryya
• 7,460 points
2,141 views
0 votes
1 answer

Hyperledger Fabric: orderer launching fails with error "panic: Error reading configuration:Unsupported Config Type"

The error says there's some problem finding ...READ MORE

Oct 30, 2018 in Blockchain by Omkar
• 69,220 points
2,137 views
0 votes
1 answer

How can i create a simple P2P network on a blockchain?

To develop your own cryptocurrency, you need ...READ MORE

Apr 20, 2018 in Blockchain by Christine
• 15,790 points
2,135 views
+1 vote
1 answer

hyperledger fabric: can't find package: github.com/pkg/errors in GOPATH or GOROOT

Hey @aiga, try to add the package ...READ MORE

Aug 5, 2019 in Blockchain by Esha
2,129 views
0 votes
1 answer

Are there null like thing in solidity

You could create none variable to use it as ...READ MORE

Sep 21, 2018 in Blockchain by digger
• 26,740 points
2,126 views
+1 vote
1 answer

How to deploy ethereum smart contracts on a website?

There are many ways to do this: 1 ...READ MORE

Mar 27, 2018 in Blockchain by Johnathon
• 9,090 points
2,126 views
0 votes
1 answer

Web3: No provider set error

To solve this error, you need to ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
• 69,220 points
2,125 views
0 votes
1 answer

Python Script to pull data from Blockchain JSON

Try this: print r.json()['address'],' has ', r.json()['n_tx'], 'tr ...READ MORE

Sep 14, 2018 in Blockchain by digger
• 26,740 points
2,121 views
0 votes
1 answer

How to create a Genesis Block in a Private Network?

{     "nonce": "0x0000000000000042",     "difficulty": "0x000000100",     "alloc": {     },     "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",     "coinbase": "0x0000000000000000000000000000000000000000",     "timestamp": "0x00",     "parentHash": ...READ MORE

Jul 12, 2018 in Blockchain by digger
• 26,740 points
2,119 views