Most viewed questions in Blockchain

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1 answer

How to connect a NS3 node to my local blockchain?

To connect all your nodes with all ...READ MORE

Jul 25, 2018 in Blockchain by digger
 • 26,740 points • 2,646 views
0 votes
1 answer

Truffle init: throw er; // Unhandled 'error' event

Modified the cli.bundled.js: replaced https.request with request Diff: ...READ MORE

Sep 27, 2018 in Blockchain by digger
 • 26,740 points • 2,643 views
0 votes
1 answer

Intl.NumberFormat() does not show the Bitcoin Ƀ Symbol

According to bitcoin.it (https://en.bitcoin.it/wiki/Bitcoin_symbol), The ISO 4217 currency code for ...READ MORE

Aug 27, 2018 in Blockchain by slayer
 • 29,370 points • 2,637 views
0 votes
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
 • 10,400 points • 2,634 views
0 votes
1 answer

What is the format for crypto-config.yaml and configtx.yaml in Hyperledger Fabric?

You can find the details you want ...READ MORE

Jul 12, 2018 in Blockchain by slayer
 • 29,370 points • 2,633 views
0 votes
1 answer

How to install metamask?

MetaMask is a browser plugin, you install ...READ MORE

Feb 28, 2019 in Blockchain by Lakhan
 • 2,632 views
0 votes
1 answer

How can I create an online wallet without any 3rd party API on my PHP server?

With any approach, you need a bitcoin ...READ MORE

Aug 30, 2018 in Blockchain by Perry
 • 17,100 points • 2,628 views
0 votes
1 answer

How to retain the container state after shutdown/restart of Hyperledger Fabric network?

In a Dev environment, you can first ...READ MORE

Jul 17, 2018 in Blockchain by slayer
 • 29,370 points • 2,622 views
0 votes
2 answers

Check Bitcoin Balance with mybitx api https GET url

You can use the PHP Requests library for an ...READ MORE

Sep 17, 2018 in Blockchain by Lalit
 • 2,618 views
0 votes
1 answer

Truffle Compile failing, ParserError: Expected token LParen got Identifier function

Your parentheses are mismatched. pragma solidity ^0.4.17; import "truffle/Assert.sol"; import ...READ MORE

Oct 9, 2018 in Blockchain by Omkar
 • 69,220 points • 2,604 views
0 votes
1 answer

How to get the already existing channels in Hyperledger v1.0?

You cannot see all available channels,  but you ...READ MORE

Jun 4, 2018 in Blockchain by Perry
 • 17,100 points • 2,603 views
–1 vote
1 answer

Geth miner not working

Hi. miner.start() gives no output. So, when the output ...READ MORE

Jan 17, 2019 in Blockchain by Omkar
 • 69,220 points • 2,598 views
0 votes
1 answer

Hyperledger Fabric CA "Failed to get user: User not found"

The problem could be because of the ...READ MORE

Jul 23, 2018 in Blockchain by digger
 • 26,740 points • 2,598 views
0 votes
1 answer

Why am I not getting 100 ethers in my metamask account?

Sorry that you're having this problem. To ...READ MORE

Jun 14, 2018 in Blockchain by Christine
 • 15,790 points • 2,595 views
0 votes
1 answer

what coding language is this in for ethereum and does this work for trading if setup right?

Hi there, I dont know about ethereum, but ...READ MORE

Jan 4, 2021 in Blockchain by Achuth
 • 150 points • 2,593 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
 • 26,740 points • 2,591 views
+1 vote
1 answer

How to create participant and there identities via rest API in Hyperledger Composer?

If you have already imported an Identity ...READ MORE

Aug 10, 2018 in Blockchain by Perry
 • 17,100 points • 2,590 views
0 votes
1 answer

Not able to install ganache

There is an alternative method. You can ...READ MORE

Feb 8, 2019 in Blockchain by Omkar
 • 69,220 points • 2,566 views
0 votes
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
 • 69,220 points • 2,566 views
0 votes
1 answer

How To Get BTC Price on Binance from Binance API

In the Script environment for Apps, the ...READ MORE

Feb 28, 2022 in Blockchain by Soham
 • 9,710 points • 2,563 views
0 votes
1 answer

ERROR: for cli UnixHTTPConnectionPool(host='localhost, port=None) Read time out log_timeout_error()

Can't give proper solution without knowing what ...READ MORE

May 15, 2019 in Blockchain by Rishi
 • 2,554 views
0 votes
2 answers

Hyperledger-fabric : chaincode deploy connection error "addrConn.resetTransport failed to create client"

I have your problem too,  PLEASE HELP ...READ MORE

Feb 28, 2019 in Blockchain by Hyperledger hater
 • 2,549 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
 • 69,220 points • 2,542 views
0 votes
1 answer

How many peers in fabric network need to endorse a transaction?

The number of peers required to endorse ...READ MORE

Jan 31, 2019 in Blockchain by Omkar
 • 69,220 points • 2,532 views
0 votes
1 answer

Solidity: How to return id from hash value?

You can do it by storing the hash ...READ MORE

Oct 22, 2018 in Blockchain by Omkar
 • 69,220 points • 2,531 views
0 votes
0 answers

What is the address of the sender in this transaction:0x5edb69874d0900d8857468fbe53715cc1a58137709b8b70e46299bf10983dc09

Apr 1, 2020 in Blockchain by Dinesh
 • 180 points • 2,516 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
 • 69,220 points • 2,502 views
0 votes
1 answer

Bitcoin Wallet address validation using Json and bitcoin/blockexplorer.

The URL isn't returning JSON. So instead ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,370 points • 2,502 views
0 votes
2 answers

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
 • 7,460 points • 2,499 views
+2 votes
2 answers

Can two chaincode interact with each other?

Yes, it is possible for two chaincodes ...READ MORE

Jul 12, 2018 in Blockchain by slayer
 • 29,370 points • 2,497 views
+1 vote
3 answers

Pass all .dat files in folder to function

os.listdir(path) return names, not fullpaths change parseBlockFile(file) to fullpath = os.path.join(path,file) if os.path.isfile(fullpath) ...READ MORE

Sep 5, 2018 in Blockchain by Saygum
 • 2,490 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
 • 29,370 points • 2,484 views
0 votes
1 answer

Hyperledger-Composer: Error: Object with ID 'undefined' in collection with ID 'chaincodes' does not exist

First delete the cache and cookies from ...READ MORE

Oct 29, 2018 in Blockchain by Omkar
 • 69,220 points • 2,482 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
 • 69,220 points • 2,474 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
 • 69,220 points • 2,472 views
0 votes
1 answer

Python request module for bitcoin json rpc

This should work: #!/usr/bin/env python import getpass import json import requests ...READ MORE

Aug 28, 2018 in Blockchain by digger
 • 26,740 points • 2,472 views
0 votes
1 answer

Unable to bring up first network in hyperledger fabric

I think there's a conflict with docker ...READ MORE

May 2, 2019 in Blockchain by Karan
 • 2,467 views
0 votes
1 answer

How would I run SpringBoot with the Java-SDK of Hyperledger Fabric java daemon?

I am not familiar with SpringBoot, but ...READ MORE

Jul 4, 2018 in Blockchain by aryya
 • 7,460 points • 2,467 views
0 votes
1 answer

How to install Ethereum Blockchain on Linux?

To install Ethereum on Linux, open the ...READ MORE

Feb 28, 2019 in Blockchain by Kruti
 • 2,455 views
0 votes
1 answer

NodeJS POST Request Over JSON-RPC

You're missing the --header option: curl --request POST \ ...READ MORE

Sep 28, 2018 in Blockchain by digger
 • 26,740 points • 2,449 views
0 votes
1 answer

Where does Hyperledger Fabric store the database for the Blockchain? [closed]

The Hyperledger Fabric stores the database in ...READ MORE

Jul 13, 2018 in Blockchain by Perry
 • 17,100 points • 2,448 views
0 votes
0 answers

Hyperledger Fabric: Errors in Deliver and Broadcast services

Hello, I have create successfully a multi-org, ...READ MORE

Feb 22, 2019 in Blockchain by Cha
 • 2,437 views
0 votes
1 answer

Not able to install truffle

This error occurs when there are permission ...READ MORE

Jan 29, 2019 in Blockchain by Omkar
 • 69,220 points • 2,436 views
+1 vote
1 answer

How do I check the history of my ethereum wallet using blockchain API?

f I understand well, you're looking for ...READ MORE

Aug 2, 2018 in Blockchain by Christine
 • 15,790 points • 2,423 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
 • 69,220 points • 2,418 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
 • 69,220 points • 2,402 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
 • 69,220 points • 2,393 views
+1 vote
0 answers

cryptogen: error: open ./crypto-config.yaml: The system cannot find the file specified [closed]

I created a generate.sh to generate crypto ...READ MORE

Mar 1, 2019 in Blockchain by Tharindu
 • 170 points
closed Mar 1, 2019 by Tharindu • 2,392 views
0 votes
1 answer

BitcoinJ generate address from private key

Convert string private key into bytes[]: ECKey key = ...READ MORE

Sep 4, 2018 in Blockchain by slayer
 • 29,370 points • 2,384 views
+1 vote
1 answer

How to install Hyperledger Composer on Linux?

You need some pre-requisites to install Hyperledger ...READ MORE

Mar 1, 2019 in Blockchain by Avanti
 • 2,370 views
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