Most answered questions in Blockchain

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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 • 2,797 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 • 5,112 views
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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
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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 • 5,871 views
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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 • 6,665 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
 • 69,210 points • 3,286 views
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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 • 5,128 views
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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 • 923 views
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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 • 1,010 views
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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 • 1,918 views
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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 • 2,180 views
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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 • 464 views
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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 • 1,591 views
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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
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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
+1 vote
1 answer

Why is Blockchain called a Disruptive Technology?

Blockchain Technology showed the world a new ...READ MORE

Dec 4, 2018 in Blockchain by Omkar
 • 69,210 points • 764 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 • 1,871 views
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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
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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 • 1,392 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 • 752 views
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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 • 928 views
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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
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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
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 • 4,162 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 • 677 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 • 1,217 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 • 671 views
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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 • 1,595 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
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 • 1,307 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 • 491 views
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1 answer

Hyperledger Fabric: How to get transaction history using key?

history, err := stub.GetHistoryForKey(key_value) for history.HasNext() { ...READ MORE

Nov 20, 2018 in Blockchain by Omkar
 • 69,210 points • 3,315 views
0 votes
1 answer

Hyperledger Composer: How to write complex queries in Composer?

You can do this using the query ...READ MORE

Nov 20, 2018 in Blockchain by Omkar
 • 69,210 points • 1,032 views
0 votes
1 answer

Hyperledger Fabric: “Local Fabric binary version does not match this newer version of BYFN and is unsupported”.

You need to first delete the existing ...READ MORE

Nov 19, 2018 in Blockchain by Omkar
 • 69,210 points • 6,565 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
 • 69,210 points • 3,454 views
0 votes
1 answer

Ethereum: Cloning cpp-ethereum from git.

Yes, you can only clone the additional ...READ MORE

Nov 19, 2018 in Blockchain by Omkar
 • 69,210 points • 673 views
0 votes
1 answer

Accessing External Api in HyperLedger Fabric

Generally you are not supposed to call ...READ MORE

Nov 17, 2018 in Blockchain by Christine
 • 15,790 points • 1,564 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 • 2,493 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 • 2,415 views
0 votes
1 answer

How can I send data to docker?

Whenever i invoke chaincode from the cli ...READ MORE

Nov 17, 2018 in Blockchain by Christine
 • 15,790 points • 382 views
0 votes
1 answer

Hyperledger Fabric: How to Parse arrays in req.body in node js express?

You can get the value from the ...READ MORE

Nov 16, 2018 in Blockchain by Kavya
 • 6,172 views
0 votes
1 answer

Hyperledger Fabric: How to Enable Full Logging in Balance Transfer?

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

Nov 16, 2018 in Blockchain by Omkar
 • 69,210 points • 1,255 views
0 votes
1 answer

Hyperledger Fabric: Changing component item owner automatically with its parent

You can try something like this: /** * ...READ MORE

Nov 16, 2018 in Blockchain by Omkar
 • 69,210 points • 828 views
0 votes
1 answer

Hyperledger composer: How to include relationship in custom query?

You are trying to use filter={"include":"resolve"} in Composer Query. ...READ MORE

Nov 16, 2018 in Blockchain by Omkar
 • 69,210 points • 940 views
0 votes
1 answer

Hyperledger Fabric :failed to send proposal to peers: Unable to resolve host peer0.org1

This peer address does not exist on ...READ MORE

Nov 16, 2018 in Blockchain by Omkar
 • 69,210 points • 2,035 views
0 votes
1 answer

Hyperledger Fabric: How to start/stop the fabric nodes?

This is another way to do it: docker ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,210 points • 1,010 views
0 votes
1 answer

Hyperledger Fabric: make peer make: *** No rule to make target `peer'. Stop

The makefile is in /opt/gopath/src/github.com/hyperledger/fabric , not ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,210 points • 1,014 views
0 votes
1 answer

Hyperledger Docker: Error building images: cannot connect to Docker endpoint.

Check your container environment variable: CORE_VM_ENDPOINT=unix:///var/run/docker.sock Then if you ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,210 points • 1,528 views
0 votes
1 answer

Hyperledger Fabric: unable to check out source code from gerrit.hyperledger.org

There's something wrong with your SSH key. ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,210 points • 482 views
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