Most viewed questions in Blockchain

+1 vote
2 answers

Using Composite Key formation to get states for a date range in Hyperledger Fabric V1.0

I think you have found a partial ...READ MORE

Jul 20, 2018 in Blockchain by charlie_brown
 • 7,720 points • 5,354 views
0 votes
1 answer

How to set the ERC20 token price in respect to ether in solidity?

Hi, @Jas, In Solidity, you don't directly set ...READ MORE

Nov 9, 2020 in Blockchain by anonymous
 • 10,440 points • 5,347 views
0 votes
1 answer

What is the difference between if() and require() statement in solidity??

If() and require() have separate functions and ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
 • 10,400 points • 5,324 views
0 votes
1 answer

Invalid opcode error in a simple Solidity contract and script

You don't need to call .at() if you're using .new(). ...READ MORE

Sep 14, 2018 in Blockchain by slayer
 • 29,370 points • 5,262 views
0 votes
1 answer

ethereum eth_sendTransaction via PHP curl

Your params field is missing a wrapping array. Try ...READ MORE

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 5,244 views
0 votes
1 answer

Cant decode hex sting into decimal. Getting TypeError.

On the line where it shows error, ...READ MORE

Jul 6, 2018 in Blockchain by slayer
 • 29,370 points • 5,235 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
 • 69,180 points • 5,152 views
+1 vote
2 answers

HyperLedger Fabric Java SDK - Wrinting the ChainCode Sample in Java

To get started developing Java chaincode Ensure you ...READ MORE

Aug 3, 2018 in Blockchain by Omkar
 • 69,180 points • 5,089 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
 • 5,073 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
 • 5,068 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
 • 69,180 points • 5,048 views
+1 vote
2 answers

How to solve Hyperledger Fabric "error endorsing chaincode" error?

Try to install chaincode with a name ...READ MORE

Jul 13, 2018 in Blockchain by digger
 • 26,740 points • 5,023 views
+1 vote
2 answers

I get the following error while i run the command ./byfn.sh up. I have tried removing all the containers and updated every required version but still the same error

Not sure if this is still relevant ...READ MORE

Aug 22, 2019 in Blockchain by Shailaja
 • 160 points • 4,944 views
0 votes
2 answers

Why is network already up to date while trying to deploy a contract on truffle?

I guess you have ganache running already ...READ MORE

Apr 24, 2018 in Blockchain by Shashank
 • 10,400 points • 4,927 views
+1 vote
2 answers

Error 500: mychannel has been migrated to new lifecycle. Chaincode instantiation error.

This error occured only because I had ...READ MORE

Jan 9, 2020 in Blockchain by Aditya
 • 250 points • 4,861 views
+1 vote
1 answer

Security Properties of Hash Functions

The difference is indeed subtle. I understood ...READ MORE

Mar 27, 2018 in Blockchain by Johnathon
 • 9,090 points • 4,853 views
0 votes
3 answers

Hyperledger fabric: Cant connect peer to channel

Open the hosts file: $ gedit /etc/hosts And add the IP ...READ MORE

May 8, 2019 in Blockchain by John
 • 4,804 views
0 votes
1 answer

Javascript Websocket subscribe to channel

This is how you can do it let ...READ MORE

Aug 28, 2018 in Blockchain by slayer
 • 29,370 points • 4,769 views
0 votes
1 answer

Not able to install truffle using npm install -g truffle

You'd need root access to install truffle ...READ MORE

Jul 14, 2021 in Blockchain by Dero Idoghor
edited Mar 5 • 4,758 views
+1 vote
1 answer

Error: failed to create deliver client: orderer client failed to connect to order.example.com:7050: failed to create new connection: context deadline exceeded

I am facing the some problem in ...READ MORE

Dec 14, 2019 in Blockchain by xyz
 • 210 points • 4,750 views
0 votes
1 answer

"Migrations" -- Returned error: authentication needed: password or unlock.

By default, the accounts are locked and ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,180 points • 4,643 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
 • 69,180 points • 4,632 views
0 votes
2 answers

Is it possible to modify a variable value from another contract?

No, you can't directly edit a variable ...READ MORE

Sep 24, 2018 in Blockchain by Sai
 • 4,622 views
0 votes
1 answer

Send all Tokens and Eth to a Address automatically

require(token.transfer(beneficiary, token.balanceOf(this))); where token is the ERC20 token you're transferring. ...READ MORE

Oct 1, 2018 in Blockchain by digger
 • 26,740 points • 4,565 views
+1 vote
1 answer

What are the differences between the hyperledger and Blockchain?

To answer your first query.. Blockchain is ...READ MORE

Apr 5, 2018 in Blockchain by anonymous
 • 4,549 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
 • 4,546 views
0 votes
1 answer

How can I get the same return value as solidity `abi.encodePacked` in Golang?

This is what I used:  package main import ( ...READ MORE

Sep 26, 2018 in Blockchain by slayer
 • 29,370 points • 4,534 views
+1 vote
1 answer

Error: failed to create deliver client for orderer: orderer client failed to connect to orderer.example.com:7050: failed to create new connection: context deadline exceeded

It is caused because of firewall restriction, ...READ MORE

Nov 2, 2022 in Blockchain by Prudhvi Krishna Menavalli
edited Mar 5 • 4,506 views
+1 vote
4 answers

How can we search a block using transaction Id(TxID) or hash?

The most obvious use case would be ...READ MORE

Apr 10, 2018 in Blockchain by Johnathon
 • 9,090 points • 4,497 views
0 votes
1 answer

I face problem while running hyperledger fabric's sample application "build your first network" byfn.sh giving time out while chaincode installation.

Hey, @Sudip, Please check if the peer container ...READ MORE

Apr 27, 2020 in Blockchain by Gitika
 • 65,730 points • 4,493 views
0 votes
1 answer

Hyperledger Fabric: can't load package: package github.com/hyperledger/fabric/core/chaincode/shim:

You can install various golang projects with ...READ MORE

Oct 30, 2018 in Blockchain by Omkar
 • 69,180 points • 4,492 views
+16 votes
4 answers

Why do only ADMIN users in Hyperledger Fabric have the permission to install query in chaincode?

It was already decided that installing chaincode ...READ MORE

Apr 3, 2018 in Blockchain by Perry
 • 17,100 points • 4,468 views
–1 vote
1 answer

Not able to install truffle

I know this is very frustrating, I ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,180 points • 4,450 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 • 4,448 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 • 4,433 views
0 votes
1 answer

Could not assemble transaction, err proposal response was not successful, error code 500, msg chaincode registration failed: container exited with 0

Hey, @Nithin, Can you please post your peer ...READ MORE

Apr 9, 2020 in Blockchain by Gitika
 • 65,730 points • 4,422 views
0 votes
1 answer

NPM cannot install “truffle” on Windows

Your install is failing at node-gyp rebuild. Solutions ...READ MORE

Sep 27, 2018 in Blockchain by slayer
 • 29,370 points • 4,377 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 • 4,376 views
+1 vote
1 answer

Calling deployed smart contract from node.js

contractInstance.wakeUp.call is calling the function as constant, but ...READ MORE

Sep 26, 2018 in Blockchain by digger
 • 26,740 points • 4,337 views
+2 votes
3 answers

Hyperledger Fabric: Peer Connection error: Failed obtaining connection: Could not connect to any of the endpoints.

 You can extend your /etc/hosts file and make orderer.example.com domain name ...READ MORE

Nov 13, 2018 in Blockchain by Omkar
 • 69,180 points • 4,335 views
0 votes
1 answer

Angular 4, typescript Assign interface property to variable

The first thing worth noting is that ...READ MORE

Aug 27, 2018 in Blockchain by slayer
 • 29,370 points • 4,321 views
+1 vote
7 answers

What are the advantages and limitations of hyperledger composer over fabric?

While hyperledger composer is a set of ...READ MORE

Apr 8, 2018 in Blockchain by Perry
 • 17,100 points • 4,280 views
0 votes
1 answer

Truffle "Migrations" ran out of gas error

This error is caused because the amount ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,180 points • 4,268 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 • 4,262 views
0 votes
1 answer

How to retrieve data from a block to a blockchain?

web3.eth.getTransaction(txHash) will returns transaction details like blockHash, transactionIndex, ...READ MORE

Jun 27, 2018 in Blockchain by Perry
 • 17,100 points • 4,259 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
 • 69,180 points • 4,244 views
0 votes
1 answer

Hyperledger Fabric peer command not found error.

This error occurs when the system can ...READ MORE

Jul 2, 2018 in Blockchain by Omkar
 • 69,180 points • 4,244 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 • 4,228 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
 • 4,222 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
 • 69,180 points • 4,201 views
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