Most viewed questions in Blockchain

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How to send Bitcoins with node.js?

This website https://blockr.io/tx/push will successfully do the bitcoin transaction. You ...READ MORE

Jul 20, 2018 in Blockchain by Christine
 • 15,810 points • 539 views
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1 answer

What are the differences between chain and state database in hyperledger fabric?

There are two place which "store" data ...READ MORE

Jul 11, 2018 in Blockchain by Shashank
 • 10,360 points • 536 views
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1 answer

Bitcoin: parsing Blockchain API using JSON

Because you only add one address to ...READ MORE

Aug 22, 2018 in Blockchain by digger
 • 26,660 points • 533 views
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1 answer

How to register a user in Hyperledger Fabric?

Best practice would be to leverage an ...READ MORE

Sep 5, 2018 in Blockchain by Christine
 • 15,810 points • 532 views
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1 answer

How to setup rule in ACL file of Hyperledger Composer to validate against enum?

Use these two ACL rules: ...READ MORE

Jul 19, 2018 in Blockchain by Perry
 • 17,090 points • 529 views
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How can I communicate with peer to peer in a hyperledger fabric local network?

The peers communicate among them through the ...READ MORE

May 24, 2018 in Blockchain by Johnathon
 • 9,090 points • 529 views
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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
 • 68,840 points • 526 views
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1 answer

Ethereum nodejs: Unhandled rejection Error: Invalid JSON RPC response

gasLimit is actually represented by gas as the gas limiter ...READ MORE

Oct 15, 2018 in Blockchain by Omkar
 • 68,840 points • 523 views
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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
 • 68,840 points • 520 views
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1 answer

How to resolve blockchain DNS using Python Requests?

You could use one of their publicly ...READ MORE

Aug 20, 2018 in Blockchain by Omkar
 • 68,840 points • 520 views
+1 vote
1 answer

Can I setup hyperledger composer on multiple nodes?

To deploy your network on multiple nodes, ...READ MORE

Jul 25, 2018 in Blockchain by digger
 • 26,660 points • 520 views
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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
 • 29,260 points • 518 views
+1 vote
1 answer

How can I connect to the specified nodes using IPFS?

You can actually connect to the specific ...READ MORE

Apr 25, 2018 in Blockchain by Christine
 • 15,810 points • 518 views
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1 answer

How to solve rpc error: code = Unknown desc = timeout expired while starting chaincode error?

In the peer configuration, the port you ...READ MORE

Aug 8, 2018 in Blockchain by digger
 • 26,660 points • 517 views
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1 answer

How to install Ganache in Windows?

First, we need to install nodejs. Go ...READ MORE

Feb 28, 2019 in Blockchain by Rishi
 • 516 views
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1 answer

How to get notified when an event triggers on ethereum smart contract?

Here's a simple example for web3js 1.0.0.beta*: function handler ...READ MORE

Jun 8, 2018 in Blockchain by Aryya
 • 7,340 points • 514 views
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1 answer

Hyperledger Fabric: Cannot update chaincode

First, stop and delete all the containers: docker ...READ MORE

Oct 31, 2018 in Blockchain by Omkar
 • 68,840 points • 511 views
0 votes
1 answer

403 forbidden error coinbase api

I had a similiar issue connecting this API, ...READ MORE

Aug 28, 2018 in Blockchain by digger
 • 26,660 points • 509 views
0 votes
1 answer

How to solve EACCES:permission denied error in Hyperledger Composer?

It seems like there is no required ...READ MORE

Jul 11, 2018 in Blockchain by digger
 • 26,660 points • 509 views
0 votes
1 answer

Stuck while using call_back_address and ipn url in coinpayment.net gateway

To make use of this api, just ...READ MORE

Aug 31, 2018 in Blockchain by digger
 • 26,660 points • 508 views
0 votes
2 answers

How do I interact with a smart contract on a private network through web3.js

I found a blog that explains how ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,260 points • 506 views
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1 answer

'env' is not recognized as an internal or external command

According to the error, it seems like ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 68,840 points • 496 views
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1 answer

Web3j Transfer.sendFunds() returns Error “insufficient funds for gas * price + value”

DISCLAIMER. This may not necessarily be an answer to your ...READ MORE

Jun 16, 2018 in Blockchain by charlie_brown
 • 7,720 points • 496 views
0 votes
1 answer

How to send events in Hyperledger Composer?

You define the event in your .cto ...READ MORE

Aug 24, 2018 in Blockchain by Perry
 • 17,090 points • 492 views
0 votes
1 answer

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

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

Nov 14, 2018 in Blockchain by Perry
 • 17,090 points • 490 views
0 votes
1 answer

How to join a peer to a channel in Hyperledger Fabric?

When you run the command: peer channel create ...READ MORE

Jul 31, 2018 in Blockchain by digger
 • 26,660 points • 490 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 5, 2018 in Blockchain by Omkar
 • 68,840 points • 487 views
0 votes
1 answer

Web-scraping from Coinbase with Python (Pycharm)

Data that you want to scrape is ...READ MORE

Sep 4, 2018 in Blockchain by digger
 • 26,660 points • 486 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
 • 483 views
0 votes
1 answer

Not Able to register a user with Hyperledger-Fabric v1.1 preview

The error: "Certificate not found with AKI 'e729224e8b3f31784c8a93c5b8ef6f4c1c91d9e6e577c45c33163609fe40011' ...READ MORE

Jun 16, 2018 in Blockchain by charlie_brown
 • 7,720 points • 483 views
0 votes
1 answer

How to solve “ltdl.h: No such file or directory” error?

It seems like you are missing header ...READ MORE

Jul 26, 2018 in Blockchain by slayer
 • 29,260 points • 482 views
0 votes
1 answer

How blocks are linked in the Hyperledger Fabric blockchain?

The structure of block in Hyperledger Fabric ...READ MORE

Jul 3, 2018 in Blockchain by Omkar
 • 68,840 points • 477 views
0 votes
1 answer

Where can I find the reference format for crypto-config.yaml and configtx.yaml Hyperledger Fabric files?

The sample config files in the Hyperledger Fabric main ...READ MORE

Jun 27, 2018 in Blockchain by Aryya
 • 7,340 points • 477 views
0 votes
1 answer

Uncaught ReferenceError: web3 is not defined at window.onload

I think the onload is giving the issue. Try this ...READ MORE

Sep 28, 2018 in Blockchain by slayer
 • 29,260 points • 474 views
0 votes
1 answer

How do I validate the presence of participant owner in Asset transfer transaction?

I found the exact solution and syntax.. ...READ MORE

Aug 8, 2018 in Blockchain by Aryya
 • 7,340 points • 470 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
 • 68,840 points • 468 views
0 votes
1 answer

Solidity how to solve “Error Encoding arguments ” error while using create button?

When you pass multiple arguments, you need ...READ MORE

Jul 29, 2018 in Blockchain by slayer
 • 29,260 points • 467 views
0 votes
1 answer

How to create light wallet in Web3J?

You can use this method to create ...READ MORE

Aug 10, 2018 in Blockchain by slayer
 • 29,260 points • 465 views
0 votes
1 answer

Not able to install truffle-contract

There’s a permission error. Run this command ...READ MORE

Jan 23, 2019 in Blockchain by Omkar
 • 68,840 points • 462 views
0 votes
1 answer

Error while running curl command in Docker Quickstart Terminal

You can get the new version of ...READ MORE

Jul 12, 2018 in Blockchain by slayer
 • 29,260 points • 462 views
+1 vote
2 answers

Hyperledger Composer: "No version of composer-cli has been detected" after global installation

I am also facing a similar issue, ...READ MORE

Sep 20, 2019 in Blockchain by sam
 • 160 points • 459 views
0 votes
1 answer

how to get modification history of asset?

You can use GetHistoryForKey() API as shown ...READ MORE

Jul 9, 2018 in Blockchain by digger
 • 26,660 points • 456 views
0 votes
1 answer

How is consensus achieved in a Hyperledger Fabric?

The transactions in the network is ordered ...READ MORE

Jun 29, 2018 in Blockchain by Omkar
 • 68,840 points • 453 views
0 votes
1 answer

How to enable authentication in hyperledger Angular application

Try npm install -g passport-github READ MORE

Jun 16, 2018 in Blockchain by charlie_brown
 • 7,720 points • 450 views
+3 votes
4 answers

How to solve “ERROR: manifest for hyperledger/fabric-orderer:latest not found” error?

I was having the same problem and ...READ MORE

Sep 6, 2018 in Blockchain by Rakesh
 • 449 views
0 votes
1 answer

Hyperledger on Kubernetes - How can Kubernetes be aware of Chaincode container

I have been investigating the same issue ...READ MORE

Oct 22, 2018 in Blockchain by Christine
 • 15,810 points • 446 views
0 votes
1 answer

How to detect if an ethereum address is an ERC20 token contract?

There are many possible ways to achieve ...READ MORE

Sep 24, 2018 in Blockchain by Christine
 • 15,810 points • 443 views
0 votes
1 answer

GetState query via chaincode always returns empty value

fabric uses an ccenv image to build the chaincode when ...READ MORE

Jul 17, 2018 in Blockchain by Christine
 • 15,810 points • 443 views
0 votes
0 answers

When running the enrollAdmin.js i get this error:

Wallet path: C:\Users\Nibir Hira\go\src\github.com\hyperledger\fabric-samples\fa bcar\javascript\wallet 2019-03-29T04:07:44.902Z - error: [FabricCAClientService.js]: ...READ MORE

Mar 29, 2019 in Blockchain by anonymous
recategorized Mar 29, 2019 by Omkar • 442 views
0 votes
1 answer

Corda: uploading a file, attach and download

Hey, i found an example that i ...READ MORE

Sep 19, 2018 in Blockchain by digger
 • 26,660 points • 442 views
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