Most viewed questions in Blockchain

0 votes
1 answer

String concatenation in solidity?

A library can be used, for example: import "github.com/Arachnid/solidity-stringutils/strings.sol"; contract C ...READ MORE

Sep 21, 2018 in Blockchain by slayer
 • 29,330 points • 2,715 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
 • 2,692 views
+1 vote
5 answers

Does Hyperledger remove asset actually remove anything?

Hyperledger remove asset doesn't actually "remove" the ...READ MORE

Jun 19, 2018 in Blockchain by charlie_brown
 • 7,720 points • 2,685 views
0 votes
1 answer

Cannot find package “google/protobuf”

Firstly, your import is wrong, you are ...READ MORE

Oct 1, 2018 in Blockchain by Perry
 • 17,100 points • 2,658 views
0 votes
1 answer

Why do the resultant hash after mining has a leading no. of zeroes in Blockchain verification?

This is chosen by the DIFFICULTY EQUATION. In ...READ MORE

Aug 10, 2018 in Blockchain by Christine
 • 15,790 points • 2,654 views
+1 vote
1 answer

geth: Fatal: Failed to read genesis file: open “/home/edureka/privatechain/”: no such file or directory

Use this: geth --datadir ./data init ./custom_genesis.json READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,190 points • 2,644 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
 • 69,190 points • 2,635 views
+1 vote
2 answers

Peer chaincode instantiation timeout expired

Hey, i think you made a slight ...READ MORE

Sep 19, 2018 in Blockchain by digger
 • 26,740 points • 2,627 views
0 votes
1 answer

How do display all the events logs from a smart contract?

You'll need to watch the events. const filter ...READ MORE

Oct 3, 2018 in Blockchain by digger
 • 26,740 points • 2,620 views
0 votes
1 answer

How to save complex object in the contract in solidity

You can't pass objects when initiating a ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 69,190 points • 2,604 views
0 votes
1 answer

How to generate new address for blockchain wallet?

You can use the following to generate ...READ MORE

Jul 16, 2018 in Blockchain by digger
 • 26,740 points • 2,593 views
0 votes
0 answers

What is the total difficulty for block #4390176 in Ethereum Blockchain

Apr 1, 2020 in Blockchain by Dinesh
 • 180 points • 2,572 views
0 votes
2 answers

Using Hyperledger composer with Hyperledger Blockchain explorer.

I was facing the same issue and ...READ MORE

Aug 9, 2018 in Blockchain by digger
 • 26,740 points • 2,565 views
+1 vote
1 answer

Getting issues while Sending signTransaction with web3.js

The chain ID for ropsten is 3. ...READ MORE

Mar 28, 2018 in Blockchain by Johnathon
 • 9,090 points • 2,562 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
 • 2,557 views
0 votes
1 answer

Access multiple return values (a, b, c) from solidity function in web3js

You'll get an array of return values ...READ MORE

Sep 14, 2018 in Blockchain by slayer
 • 29,330 points • 2,557 views
0 votes
1 answer

Php code to generate Ethereum wallets.

You can use web3.eth.accounts in web3js web3.eth.accounts.create(); With Php, ...READ MORE

Jul 27, 2018 in Blockchain by slayer
 • 29,330 points • 2,552 views
0 votes
1 answer

When running the enrollAdmin.js i get this error:

you are not running the ca, port ...READ MORE

Jun 7, 2020 in Blockchain by sumit
 • 2,544 views
0 votes
1 answer

Stuck while using call_back_address and ipn url in coinpayment.net gateway

To make use of this api, just ...READ MORE

Aug 31, 2018 in Blockchain by digger
 • 26,740 points • 2,532 views
0 votes
1 answer

Hyperledger Fabric starting ./startFabric.sh Error: proposal failed (err: rpc error: code = Unavailable desc = transport is closing)

1=grpc@1.24.2     2= i have ...READ MORE

May 21, 2020 in Blockchain by Sagar
 • 180 points • 2,522 views
0 votes
1 answer

javascript bytes32 to string

Assuming you're using web3 on the JS side, it's web3.toAscii. Example ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
 • 69,190 points • 2,504 views
0 votes
1 answer

Getting Invalid number of parameters for “undefined” when deploying smart contract

Try something like this for contracts that ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,190 points • 2,495 views
+1 vote
3 answers

How efficient is Ethereum in regard to its TPS??

TPS means transactions processing at any given ...READ MORE

Apr 16, 2018 in Blockchain by Shashank
 • 10,400 points • 2,494 views
0 votes
1 answer

Solidity invalid opcode error

In the for loop, your indexing going ...READ MORE

Aug 16, 2018 in Blockchain by slayer
 • 29,330 points • 2,490 views
0 votes
1 answer

TypeError: argument must be a string node.js while encoding to hex string.

The error is in protobuf.Transaction.create headerSignature needs to be a string, ...READ MORE

Nov 6, 2018 in Blockchain by Omkar
 • 69,190 points • 2,475 views
+2 votes
1 answer

how to convert hash160 to bitcoin address in python?

Hey @Raj. I use the following script. ...READ MORE

Jul 12, 2019 in Blockchain by Tanisha
 • 2,463 views
0 votes
2 answers

how to integrate coinbase api in php for transfer bitcoine

Here the code for php please have ...READ MORE

Sep 17, 2018 in Blockchain by Suresh
 • 2,463 views
+1 vote
2 answers

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

Looks like the account you are trying ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,190 points • 2,457 views
0 votes
1 answer

Can't call contract function in truffle console

Inspect the object adoption within the console. You will ...READ MORE

Sep 28, 2018 in Blockchain by slayer
 • 29,330 points • 2,456 views
0 votes
2 answers

How to check if bitcoin address is valid?

For Java, have a look at the ...READ MORE

Aug 20, 2018 in Blockchain by Omkar
 • 69,190 points • 2,456 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
 • 2,448 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
 • 69,190 points • 2,434 views
0 votes
2 answers

Hyperledger byfn: could not assemble transaction: ProposalResponsePayloads do not match

This is because you have not installed ...READ MORE

Nov 20, 2018 in Blockchain by Omkar
 • 69,190 points • 2,434 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
 • 69,190 points • 2,425 views
+1 vote
1 answer

Hyperledger Fabric: Got permission denied Docker daemon socket at unix:///var/run/docker.sock

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

Nov 19, 2018 in Blockchain by Omkar
 • 69,190 points • 2,425 views
0 votes
1 answer

Know which exchange or wallet is behind a BTC address?

To answer your question, due to each ...READ MORE

Feb 28, 2022 in Blockchain by Soham
 • 9,700 points • 2,422 views
0 votes
2 answers

Web socket API session automatically disconnecting

Yes, the code given by Christine works! ...READ MORE

Aug 29, 2018 in Blockchain by digger
 • 26,740 points • 2,419 views
0 votes
1 answer

How to send Bitcoins with node.js?

This website https://blockr.io/tx/push will successfully do the bitcoin transaction. You ...READ MORE

Jul 20, 2018 in Blockchain by Christine
 • 15,790 points • 2,407 views
0 votes
1 answer

Bitcoin: parsing Blockchain API using JSON

Because you only add one address to ...READ MORE

Aug 22, 2018 in Blockchain by digger
 • 26,740 points • 2,405 views
+1 vote
2 answers

Can I invoke a chaincode function from the chaincode itself?

Here's an example on how you can ...READ MORE

May 7, 2019 in Blockchain by Shir
 • 2,398 views
+1 vote
2 answers

Hyperledger: get “/bin/bash: ./scripts/script.sh: No such file or directory” when running “./byfn -m up”

You can follow these steps : In your ...READ MORE

Mar 27, 2018 in Blockchain by ned_crew
 • 1,610 points • 2,397 views
0 votes
1 answer

Web3j Transfer.sendFunds() returns Error “insufficient funds for gas * price + value”

DISCLAIMER. This may not necessarily be an answer to your ...READ MORE

Jun 16, 2018 in Blockchain by charlie_brown
 • 7,720 points • 2,394 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
 • 69,190 points • 2,393 views
+1 vote
5 answers

Hyperledger Fabric: Error cryptogen tool

I got same error on Windows.  The solution ...READ MORE

Oct 25, 2018 in Blockchain by Mahesh
 • 2,367 views
0 votes
1 answer

Not able to attach geth.ipc: Fatal: Unable to attach to remote geth: connect: connection refused

You should not mention double quotes for ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,190 points • 2,365 views
0 votes
1 answer

How to add peer to ethereum private network?

To connect a node to already existing ...READ MORE

Jan 22, 2019 in Blockchain by Omkar
 • 69,190 points • 2,364 views
0 votes
1 answer

Calling function in truffle console error

Inside Truffle console ContractName.deployed().then(function(instance){app = instance}) app.adopt(23)//call method on ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,190 points • 2,362 views
+1 vote
2 answers

Where is custom chaincode path Hyperledger Fabric 1.0?

You have to have your chaincode at ...READ MORE

Jul 10, 2018 in Blockchain by slayer
 • 29,330 points • 2,354 views
0 votes
2 answers

Truffle compile: Cant find module error

You can install babel-register and try again. ...READ MORE

Feb 19, 2019 in Blockchain by Loki
 • 2,353 views
Page:

Most popular tags

"PMP®","PMI®", "PMI-ACP®" and "PMBOK®" are registered marks of the Project Management Institute, Inc. MongoDB®, Mongo and the leaf logo are the registered trademarks of MongoDB, Inc.