Most voted questions in Blockchain

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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
 • 69,210 points • 1,508 views
0 votes
1 answer

Not able to unbox truffle drizzle

It could be due to a broken ...READ MORE

Jan 9, 2019 in Blockchain by Omkar
 • 69,210 points • 1,395 views
0 votes
1 answer

Bitminter shows no progress but my system heated up and shutdown

After initialization of bitminter you won't be ...READ MORE

Jan 3, 2019 in Blockchain by Omkar
 • 69,210 points • 796 views
0 votes
1 answer

Not able to pull any events in ethereum

You need to catch the even emitted ...READ MORE

Dec 31, 2018 in Blockchain by Omkar
 • 69,210 points • 356 views
0 votes
1 answer

Ethereum contract hangs on AWS

Please check the memory consumption for docker ...READ MORE

Dec 31, 2018 in Blockchain by Omkar
 • 69,210 points • 464 views
0 votes
1 answer

When I create public getters (committed code), my contract exceeds code size limit

Are you pushing info one by one ...READ MORE

Dec 31, 2018 in Blockchain by Omkar
 • 69,210 points • 345 views
0 votes
1 answer

Not able to install Multichain

Hi. It seems you have changed some ...READ MORE

Dec 28, 2018 in Blockchain by Omkar
 • 69,210 points • 464 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
 • 69,210 points • 2,919 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
 • 4,255 views
0 votes
1 answer

Solidity error: SyntaxError: No visibility specified.

As mentioned in the error, you have ...READ MORE

Dec 12, 2018 in Blockchain by Omkar
 • 69,210 points • 6,862 views
0 votes
1 answer

How to print a message in Solidity??

You can use the require function to do this. ...READ MORE

Dec 12, 2018 in Blockchain by Omkar
 • 69,210 points • 15,365 views
0 votes
1 answer

Cant set Remix IDE to work on testrpc

As I can see that you are ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,210 points • 597 views
0 votes
1 answer

truffle create contract shows no network available error

In your truffle project directory, you have ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,210 points • 891 views
0 votes
1 answer

How to create a contract in truffle?

The command you are using to create ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,210 points • 1,356 views
0 votes
1 answer

Not able to create contracts in truffle

It seems like you have files missing that ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,210 points • 561 views
0 votes
1 answer

Not able to migrate truffle project even after running testrpc

Maybe you forgot to compile the project ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,210 points • 619 views
0 votes
1 answer

Truffle migrate: Error: You must specify a network_id in your 'development' configuration in order to use this network.

You have to mention the network id ...READ MORE

Dec 11, 2018 in Blockchain by Omkar
 • 69,210 points • 7,550 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
 • 69,210 points • 2,796 views
0 votes
1 answer

Can not open geth console: Fatal: Error starting protocol stack: listen tcp :30303: bind: address already in use

The default port for geth is 30303. ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,210 points • 5,108 views
0 votes
1 answer

Private ethereum network can not find geth.ipc

If you have initialized the genesis block ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,210 points • 2,322 views
0 votes
1 answer

How to reintialize genesis block in geth ethereum?

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

Dec 6, 2018 in Blockchain by Omkar
 • 69,210 points • 5,867 views
0 votes
1 answer

geth: Fatal: invalid genesis file: invalid character 'â' looking for beginning of object key string

Looks like your editor is adding characters ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,210 points • 6,659 views
0 votes
1 answer

geth: Fatal: Error starting protocol stack: datadir already used by another process

It seems like geth is already running. ...READ MORE

Dec 6, 2018 in Blockchain by Omkar
 • 69,210 points • 5,127 views
0 votes
1 answer

Why do I require fabric-kafka and fabric-order containers in same network?

There are three ordering services, as you ...READ MORE

Dec 6, 2018 in Blockchain by Perry
 • 17,100 points • 922 views
0 votes
1 answer

How to use different network cards for multiple composer rest server users?

You are getting the same network card in ...READ MORE

Dec 6, 2018 in Blockchain by Perry
 • 17,100 points • 1,009 views
0 votes
1 answer

truffle compile shows error: TypeError: Invalid type for argument in function call.

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

Dec 5, 2018 in Blockchain by Omkar
 • 69,210 points • 1,916 views
0 votes
1 answer

Truffle compile shows DeclarationError: Undeclared identifier.

Hey. You might have missed declaring the "myaddress"  ...READ MORE

Dec 4, 2018 in Blockchain by Omkar
 • 69,210 points • 2,179 views
0 votes
1 answer

Should I encrypt my address before sending bitcoin?

Hey. No, you dont have to encrypt ...READ MORE

Dec 4, 2018 in Blockchain by Omkar
 • 69,210 points • 463 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
 • 69,210 points • 1,590 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
 • 69,210 points • 1,776 views
0 votes
1 answer

What is the mean Hash Encryption?

Hash encryption is a form of providing ...READ MORE

Dec 4, 2018 in Blockchain by Omkar
 • 69,210 points • 441 views
0 votes
1 answer

Truffle npm run dev throws Error: npm ERR! Linux 4.15.0-39-generic

The json file required to run dev is ...READ MORE

Dec 1, 2018 in Blockchain by Omkar
 • 69,210 points • 1,870 views
0 votes
1 answer

Unboxing truffle: Shows error: Stopping to prevent overwriting data.

As mentioned in the error: unboxing or ...READ MORE

Dec 1, 2018 in Blockchain by Omkar
 • 69,210 points • 908 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
 • 2,751 views
0 votes
1 answer

truffle npm run dev not working

Are you running this command from the ...READ MORE

Dec 1, 2018 in Blockchain by Omkar
 • 69,210 points • 1,391 views
0 votes
1 answer

Ethereum "truffle server" gives error: TypeError: fsevents is not a constructor

Looks like you have files missing.  Try creating project with: truffle ...READ MORE

Nov 30, 2018 in Blockchain by Omkar
 • 69,210 points • 750 views
0 votes
1 answer

Not able to migrate contract in Truffle: Error: No network specified. Cannot determine current network

Make these entries in truffle.js file: module.exports = { ...READ MORE

Nov 30, 2018 in Blockchain by Omkar
 • 69,210 points • 927 views
0 votes
1 answer

Cant initialization project in truffle

Try this: truffle unbox webpack READ MORE

Nov 30, 2018 in Blockchain by Omkar
 • 69,210 points • 539 views
0 votes
1 answer

Ethereum truffle server command not working

Try this command to create project: truffle init ...READ MORE

Nov 30, 2018 in Blockchain by Omkar
 • 69,210 points • 997 views
0 votes
3 answers

Truffle migrate Could not connect to your Ethereum client.

As mentioned in the previous answer, you ...READ MORE

Feb 19, 2019 in Blockchain by Dinesh
 • 11,388 views
0 votes
1 answer

Not able to install truffle using npm install -g truffle

You need root access to install truffle, ...READ MORE

Nov 29, 2018 in Blockchain by Omkar
 • 69,210 points • 4,159 views
0 votes
1 answer

Not able to start testrpc for Ethereum truffle

Hey. It seems like you already have ...READ MORE

Nov 28, 2018 in Blockchain by Omkar
 • 69,210 points • 676 views
0 votes
1 answer

How to install chaincode in new Org in hyperledger fabric?

To do this, first enter you cli ...READ MORE

Nov 22, 2018 in Blockchain by Omkar
 • 69,210 points • 1,214 views
0 votes
1 answer

Hyperledger Vagrant make peer failed

Maybe you forgot to install docker. Try ...READ MORE

Nov 22, 2018 in Blockchain by digger
 • 26,740 points • 670 views
0 votes
1 answer

Can not make a peer in Hyperledger Fabric

You have not installed jdk on your system. ...READ MORE

Nov 22, 2018 in Blockchain by Omkar
 • 69,210 points • 418 views
0 votes
1 answer

What is my chaincode ID in Hyperledger Fabric?

Hey. You have used chaincode id but ...READ MORE

Nov 21, 2018 in Blockchain by Omkar
 • 69,210 points • 1,593 views
0 votes
1 answer

Command "network" is not defined. in hyperledger composer

For composer network to work, you must ...READ MORE

Nov 21, 2018 in Blockchain by Omkar
 • 69,210 points • 1,209 views
0 votes
4 answers

Hyperledger fabric: enrollAdmin.js Error: Cannot find module 'fabric-client'

Change your directory to fabric-samples/fabrcar. And run: npm ...READ MORE

Nov 21, 2018 in Blockchain by Omkar
 • 69,210 points • 4,614 views
0 votes
1 answer

"[RuntimeException] The "-t" option does not exist" error in Hyperledger composer.

This command runs on composer-cli. Have you ...READ MORE

Nov 21, 2018 in Blockchain by Omkar
 • 69,210 points • 1,306 views
0 votes
1 answer

How to connect channels of different systems in Hyperledger Fabric?

When you create a channel, you will ...READ MORE

Nov 20, 2018 in Blockchain by Omkar
 • 69,210 points • 490 views
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