Latest questions in Blockchain

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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
 • 69,230 points • 2,182 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
 • 69,230 points • 466 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
 • 69,230 points • 1,596 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
 • 69,230 points • 1,782 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
 • 69,230 points • 448 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
 • 69,230 points • 774 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
 • 69,230 points • 1,878 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
 • 69,230 points • 912 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
 • 2,757 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
 • 69,230 points • 1,398 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
 • 69,230 points • 755 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
 • 69,230 points • 928 views
0 votes
1 answer

Cant initialization project in truffle

Try this: truffle unbox webpack READ MORE

Nov 30, 2018 in Blockchain by Omkar
 • 69,230 points • 544 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
 • 69,230 points • 1,002 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
 • 11,406 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
 • 69,230 points • 4,166 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
 • 69,230 points • 680 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
 • 69,230 points • 1,224 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 • 684 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
 • 69,230 points • 425 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
 • 69,230 points • 1,600 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
 • 69,230 points • 1,213 views
+2 votes
4 answers

"failed to create new connection context deadline exceeded." error in Hyperledger Fabric

Try remove previous docker containers(have mentioned the ...READ MORE

Apr 24, 2019 in Blockchain by Kiran
 • 12,134 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
 • 69,230 points • 4,636 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
 • 69,230 points • 1,314 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
 • 69,230 points • 495 views
0 votes
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
 • 69,230 points • 3,319 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
 • 69,230 points • 1,035 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
 • 2,997 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
 • 69,230 points • 3,045 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
 • 69,230 points • 6,581 views
+1 vote
3 answers

Hyperledger Fabric: How to delete installed chaincode ?

One way to do it, that I ...READ MORE

Nov 19, 2018 in Blockchain by Omkar
 • 69,230 points • 5,012 views
0 votes
2 answers

Hyperledger Fabric: Error: could not assemble transaction, err proposal response was not successful.

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

Nov 19, 2018 in Blockchain by Omkar
 • 69,230 points • 7,901 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
 • 69,230 points • 3,466 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
 • 69,230 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 • 1,568 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 • 2,497 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 • 2,419 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 • 383 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
 • 6,175 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
 • 69,230 points • 1,265 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
 • 69,230 points • 829 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
 • 69,230 points • 942 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
 • 69,230 points • 2,038 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
 • 69,230 points • 1,012 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
 • 69,230 points • 1,018 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
 • 69,230 points • 1,538 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
 • 69,230 points • 492 views
0 votes
1 answer

Hyperledger Fabric: peer creation no ordering service endpoint created error

You have to pass an orderer in ...READ MORE

Nov 15, 2018 in Blockchain by Omkar
 • 69,230 points • 555 views
0 votes
1 answer

TestRPC/Ganache: the transaction doesn't have the correct nonce

Using MetaMask v3.14.1 you can reset your account as ...READ MORE

Nov 15, 2018 in Blockchain by Perry
 • 17,100 points • 2,673 views
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