Latest questions in Blockchain

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How do I get the balance of an account in Ethereum?

On the Web: (Not programmatic, but for completeness...) ...READ MORE

Nov 15, 2018 in Blockchain by Perry
 • 17,100 points • 16,777 views
0 votes
1 answer

In Ethereum Solidity, what is the purpose of the “memory” keyword?

Without the memory keyword, Solidity tries to declare variables ...READ MORE

Nov 15, 2018 in Blockchain by Perry
 • 17,100 points • 1,506 views
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1 answer

What is the difference between ipfs and ethereum?

Blockchain and IPFS are based on similar concepts of decentralized ...READ MORE

Nov 15, 2018 in Blockchain by Perry
 • 17,100 points • 3,572 views
0 votes
1 answer

Hyperledger Composer: How to specify server name in composer connection profile?

To solve this problem you can use ...READ MORE

Nov 14, 2018 in Blockchain by Omkar
 • 69,210 points • 683 views
0 votes
1 answer

Hyperledger Fabric:Promise is rejected:Error:Failed to deserialize creator identity,The supplied identity is not valid.

 This error happens because basic-network/docker-compose.yaml has CA ...READ MORE

Nov 14, 2018 in Blockchain by Omkar
 • 69,210 points • 2,092 views
0 votes
1 answer

Hyperledger Composer: Error: Object with ID 'assetID:0138' in collection with ID 'Asset:org.acme.mynetwork.Sensor'

Remove 'assetID:' from your test string. For example, 'org.acme.mynetwork#assetID:0138' ...READ MORE

Nov 14, 2018 in Blockchain by Omkar
 • 69,210 points • 758 views
0 votes
1 answer

Hyperledger Composer: How to subscribe to and see events from transactions?

Here's the problem: this.businessNetworkConnection.on('events' //This should be changed ...READ MORE

Nov 14, 2018 in Blockchain by Omkar
 • 69,210 points • 796 views
0 votes
1 answer

Hyperledger Composer: How to retrieve array of assets?

This is what worked for me: asset Ask ...READ MORE

Nov 14, 2018 in Blockchain by Omkar
 • 69,210 points • 1,449 views
0 votes
1 answer

Hyperledger Farbic: Deploying business network definition

Try to clean everything using the below ...READ MORE

Nov 13, 2018 in Blockchain by Omkar
 • 69,210 points • 366 views
0 votes
1 answer

Hyperledger Fabric: Upgrading Chaincode after modification

You need to specify the channel name ...READ MORE

Nov 13, 2018 in Blockchain by Omkar
 • 69,210 points • 2,018 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
 • 69,210 points • 3,519 views
0 votes
1 answer

Hyperledger: Explorer Shows Empty Data and Promise is rejected: Error: 12 UNIMPLEMENTED: unknown service protos.Endorser

This config worked for me: { "network-config": { ...READ MORE

Nov 13, 2018 in Blockchain by Omkar
 • 69,210 points • 1,432 views
0 votes
1 answer

Hyperledger Fabric: ERROR: manifest for hyperledger/fabric-ca:latest not found.

docker pull hyperledger/fabric-ca:x86_64-1.1.0-preview Now tag this the latest ...READ MORE

Nov 13, 2018 in Blockchain by Omkar
 • 69,210 points • 1,384 views
0 votes
1 answer

Hyperledger Composer: Not able to query fabric.

Add another rule to .acl file to ...READ MORE

Nov 12, 2018 in Blockchain by Omkar
 • 69,210 points • 432 views
0 votes
1 answer

Hyperledger Fabric: Error: Error getting chaincode code chaincode: cannot find package

In the startFabric.sh launch the cli container ...READ MORE

Nov 12, 2018 in Blockchain by Omkar
 • 69,210 points • 4,974 views
0 votes
1 answer

Hyperledger Composer: Error: Chaincode already installed - Composer-playground

You get this error because composer-playground saves ...READ MORE

Nov 12, 2018 in Blockchain by Omkar
 • 69,210 points • 1,242 views
0 votes
1 answer

Hyperledger: How to take DateTime input from user?

There are tow options: 1. You can set ...READ MORE

Nov 12, 2018 in Blockchain by Omkar
 • 69,210 points • 1,125 views
0 votes
1 answer

Hyperledher: How to convert formControlName value to JSON Format?

<textarea [ngModel]="offers[0] | json" formControlName="offers" class="form- ...READ MORE

Nov 12, 2018 in Blockchain by Omkar
 • 69,210 points • 923 views
0 votes
1 answer

Error With Rest Server: HyperLedger

It's a trivial issue mate - you're ...READ MORE

Nov 9, 2018 in Blockchain by Christine
 • 15,790 points • 834 views
0 votes
1 answer

Hyperledger Fabric query system chaincode using node SDK

The Fabric Node SDK actually provides a ...READ MORE

Nov 9, 2018 in Blockchain by Christine
 • 15,790 points • 1,011 views
0 votes
2 answers

Hyperledger Fabric: invokeChaincode returns [Object object]

Replace  return shim.success(valString); with: return shim ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 822 views
0 votes
1 answer

Hyperledger Composer: How to update a contract after it is saved?

Try this and see if this works: /** * ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 532 views
0 votes
2 answers

Hyperledger Composer: Adding a new peer: failed to create a new connection: context deadline exceeded.

Seems like peer address problem. Set the ...READ MORE

May 6, 2019 in Blockchain by Tina
 • 3,463 views
0 votes
1 answer

Hyper Fabric: Error: CONNECTION_FAILED. Description: dialing connection timed out

The mapping is not set up right. ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 2,508 views
0 votes
1 answer

Hyperledger Fabric: How to give full read access to all participants?

To do this, you must first provide ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 1,080 views
0 votes
1 answer

Hyperledger Composer: How to query using string?

You can try this: query selectReading { ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 382 views
0 votes
1 answer

Hyperledger Fabric: Kafka can not establish a connection

Try this:  kafka1.hyperfabric.xyz: image: hyperledger/fabric-kafka restart: ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 1,354 views
0 votes
1 answer

Hyperledger Fabric: How to ping network using program?

// http://nodejs.org/api.html#_child_processes var sys = require('sys') var exec = ...READ MORE

Nov 9, 2018 in Blockchain by Omkar
 • 69,210 points • 921 views
0 votes
1 answer

Hyperldger: Hyperledger Explorer not starting. Throws error

in "network-config" you should use lowercase 'org1' { ...READ MORE

Nov 8, 2018 in Blockchain by Omkar
 • 69,210 points • 2,095 views
0 votes
1 answer

Hyperledger Fabric: How to retrieve result from Fabric Transaction?

invokeChainCode(securityContext, functionName, args, options) { ...READ MORE

Nov 8, 2018 in Blockchain by Omkar
 • 69,210 points • 1,632 views
0 votes
1 answer

Hyperledger: How to retrieve properties of relationship through query?

I dont think its possible using query. ...READ MORE

Nov 8, 2018 in Blockchain by Omkar
 • 69,210 points • 643 views
0 votes
1 answer

Hyperledger Fabric: How to convert channel.tx artifact into json?

You can use configtxgen to do this: configtxgen ...READ MORE

Nov 8, 2018 in Blockchain by Omkar
 • 69,210 points • 714 views
0 votes
1 answer

Hyperledger composer: How to allow create in transaction? Access Control

This is how you can do it: /** @returns ...READ MORE

Nov 8, 2018 in Blockchain by Omkar
 • 69,210 points • 741 views
+1 vote
1 answer

Error while instantiating chaincode

Hey @Vikas!  The error says, dial unix /host/var/run/docker.sock: connect: ...READ MORE

Nov 6, 2018 in Blockchain by Omkar
 • 69,210 points • 1,111 views
+1 vote
1 answer

invalid sender error when trying to send signed transaction

Hi, i had the same error and ...READ MORE

Nov 16, 2018 in Blockchain by bublig737
 • 5,242 views
0 votes
1 answer

Hyperledger Fabric SDK Design/Role of the application

When invoking functions, it has to be ...READ MORE

Nov 6, 2018 in Blockchain by Perry
 • 17,100 points • 587 views
0 votes
1 answer

Setting up Hyperledger Fabric Application with IBM Cloud.

You have to develop your "Client" application ...READ MORE

Nov 6, 2018 in Blockchain by Perry
 • 17,100 points • 534 views
0 votes
4 answers

Hyperledger: byfn.sh up: ERROR !!! FAILED to execute End-2-End Scenario.

Try these commands $ docker rm -f $(docker ...READ MORE

Nov 28, 2018 in Blockchain by kartik chauhan
 • 6,016 views
0 votes
1 answer

Hyperledger: How to update values from an asset?

This should work: return getAssetRegistry('org.rytle.Route').then(function(ar) { ...READ MORE

Nov 6, 2018 in Blockchain by Omkar
 • 69,210 points • 1,377 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
 • 69,210 points • 3,095 views
0 votes
1 answer

Hyperledger Composer: REST Server transaction failed but returns 200 status

You need to return the function calls from the ...READ MORE

Nov 6, 2018 in Blockchain by Omkar
 • 69,210 points • 613 views
0 votes
1 answer

Hyperledger composer: Not able to issue identities from a Business network.

To specify your own affiliation you need ...READ MORE

Nov 6, 2018 in Blockchain by Omkar
 • 69,210 points • 1,255 views
0 votes
1 answer

Hyperledger Fabric: How to access transaction ID in invoke function?

You can access transaction ID in Invoke ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 2,189 views
0 votes
1 answer

Hyperledger Composer: How to Update Existing Assets?

get on an asset registry returns a ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 1,195 views
+1 vote
4 answers

Hyperledger Fabric: Failed to enroll admin: Error: Failed to enroll admin.

As your .hfc-key-store directory is in chaindev, Try running the following ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 5,391 views
0 votes
1 answer

Hyperledger Fabric: PEM encoded certificate is required.

Hey, the syntax you are using is ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 1,559 views
0 votes
1 answer

Hyperledger composer: runtime install error card not found peerAdmin

The right way to do it is: downloadFabric.sh startFabric.sh createPeerAdminCard.sh If ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 949 views
+1 vote
2 answers

Hyperledger fabric: Error: got unexpected status: FORBIDDEN -- Failed to reach implicit threshold of 1 sub-policies

Try  ./byfn.sh -m down and then ./byfn.sh -m up READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 5,779 views
0 votes
1 answer

Hyperledger Fabric ./byfn -m up not bringing up

Seems like you have not installed docker-compose. ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 1,217 views
0 votes
1 answer

Hyperledger Composer: Error: Error trying to start business network. Error: No valid responses from any peers.

You have to configure TLS in peers ...READ MORE

Nov 5, 2018 in Blockchain by Omkar
 • 69,210 points • 2,298 views
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