Most viewed questions in Blockchain

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How to generate pem with openssl?

Here’s the working code: int generatePem(char **pem) { ...READ MORE

Aug 23, 2018 in Blockchain by digger
 • 26,740 points • 884 views
+1 vote
2 answers

How is Blockchain programming languages different than usual programming?

The programming syntax of most of the ...READ MORE

Mar 30, 2018 in Blockchain by Christine
 • 15,790 points • 883 views
+2 votes
1 answer

Composer playground - issue on RHEL

Hey, Renu353. There could be more than ...READ MORE

Sep 24, 2018 in Blockchain by Omkar
 • 69,210 points • 882 views
0 votes
2 answers

Does Ethereum Solidity support Associative Arrays?

Here's a little example that passes values ...READ MORE

Sep 17, 2018 in Blockchain by Bobin
 • 882 views
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1 answer

How to transact custom token instead of ethers using JSON rpc?

First create your custom token. Then develop ...READ MORE

Jul 10, 2018 in Blockchain by digger
 • 26,740 points • 882 views
0 votes
1 answer

Solidity, why the used function is placed before the brace "{}" when define a new function?

Hey there! 1. Yes, using the same name ...READ MORE

Apr 4, 2019 in Blockchain by Omkar
 • 69,210 points • 881 views
0 votes
1 answer

Do the orderers see the transaction data in Hyperledger Fabric?

No, the orderers do not see the ...READ MORE

Feb 4, 2019 in Blockchain by Omkar
 • 69,210 points • 881 views
0 votes
1 answer

Mining on private Ethereum blockchain

You control how miners work on your ...READ MORE

Jul 25, 2018 in Blockchain by Johnathon
 • 9,090 points • 881 views
0 votes
1 answer

Truffle tutorials "Error:recipient address is not a contract address"

It appears like you have already migrated ...READ MORE

Aug 8, 2018 in Blockchain by slayer
 • 29,350 points • 880 views
0 votes
1 answer

Not able to connect to Ethereum client.

There is another way to link it. ...READ MORE

Apr 28, 2019 in Blockchain by Aashish Pasricha
 • 878 views
0 votes
2 answers

Hyperledger: Cello Operator Dashboard stuck at loading

This may be due to some inconsistency ...READ MORE

Mar 12, 2019 in Blockchain by Pikvik
 • 878 views
0 votes
2 answers

How to set permissions within a blockchain?

There are blockchains that allow defining permissions. Hyperledger ...READ MORE

Aug 28, 2018 in Blockchain by Michael
 • 878 views
0 votes
0 answers

How do I apply Ethereum Private blockchain or Hyperledger Fabric to Healthcare data management/Drug Traceability?

I just need a lab practice guide ...READ MORE

Jul 3, 2020 in Blockchain by pauloshikoya
 • 120 points
recategorized Jul 3, 2020 by Gitika • 875 views
0 votes
1 answer

How to change default rpc port in Multichain?

You can use a different port. When ...READ MORE

Mar 1, 2019 in Blockchain by Omkar
 • 69,210 points • 875 views
0 votes
1 answer

“make” build ‘EC_GF2m_simple_method’ was not declared in this scope error in centos7

Step 1: I assume that your present ...READ MORE

Sep 17, 2018 in Blockchain by digger
 • 26,740 points • 875 views
0 votes
1 answer

Hyperledger Composer Playground: error # Instance org.acme.securebox.Order#1234 missing required field customer

All you have to do is add ...READ MORE

Nov 2, 2018 in Blockchain by Omkar
 • 69,210 points • 873 views
0 votes
1 answer

PROTOBUF_INLINE_NOT_IN_HEADERS

I had the same problem on Ubuntu ...READ MORE

Jun 7, 2018 in Blockchain by Christine
 • 15,790 points • 873 views
0 votes
1 answer

Not able to send ethers in private ethereum network

Your account is locked by default due ...READ MORE

Jan 9, 2019 in Blockchain by Omkar
 • 69,210 points • 871 views
0 votes
1 answer

How to receive Json callback?

Try using $get = file_get_contents("php://input"); READ MORE

Aug 29, 2018 in Blockchain by slayer
 • 29,350 points • 871 views
0 votes
1 answer

Getting error while trying to submit a transaction on hyperledger playground

not enough information as to how you ...READ MORE

Jul 17, 2018 in Blockchain by Shashank
 • 10,400 points • 871 views
0 votes
1 answer

Hyperledger-Fabric Endorsement Policy: What are Members and Admins?

The goal of endorsement policy to set ...READ MORE

Jul 13, 2018 in Blockchain by Christine
 • 15,790 points • 871 views
0 votes
1 answer

Bitstamp API signature in Ruby

Here is a code that works: require 'open-uri' require ...READ MORE

Aug 28, 2018 in Blockchain by slayer
 • 29,350 points • 869 views
+1 vote
1 answer

Blockchain - Virtual box is set up and error while executing Hyperledger example from github

The challenge you are facing is mostly ...READ MORE

Mar 27, 2018 in Blockchain by Gabriel
 • 680 points • 868 views
0 votes
1 answer

Repeating transactions hangs - web3js, local geth

If you are sending transactions back-to-back from ...READ MORE

Sep 24, 2018 in Blockchain by digger
 • 26,740 points • 866 views
0 votes
1 answer

coin.mx : 403 forbidden error on my web request

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

Sep 11, 2018 in Blockchain by digger
 • 26,740 points • 866 views
0 votes
1 answer

How to get the number of tokens in the Bitcoin network?

This information can easily be calculated by ...READ MORE

Aug 31, 2018 in Blockchain by Christine
 • 15,790 points • 866 views
0 votes
2 answers

Coinbase-php createButton() throws 401 error

I found the explanation for this on ...READ MORE

Aug 30, 2018 in Blockchain by Naman
 • 865 views
+1 vote
2 answers

How a merkle tree is generated?

In a Merkle tree, transaction IDs (txid) ...READ MORE

Apr 5, 2018 in Blockchain by Shashank
 • 10,400 points • 863 views
0 votes
1 answer

Is there a way to get the market cap or market cap rank of a coin using the Binance API?

There is no "legal" way to get ...READ MORE

Apr 12, 2022 in Blockchain by Rahul
 • 9,670 points • 861 views
0 votes
1 answer

Javascript mBTC to BTC conversion not working

At the beginning of bitcoinConversion() you have: if (currentUnit != ...READ MORE

Sep 5, 2018 in Blockchain by slayer
 • 29,350 points • 861 views
0 votes
1 answer

Using public and private keys for Blockchain transaction

You need to provide the receiver's public ...READ MORE

Jun 20, 2019 in Blockchain by Will
 • 857 views
0 votes
0 answers

API - Convert Bitcoin Amount into USD with my Api

After apiv2.bitcoinaverage.com is not free anymore I ...READ MORE

Mar 2, 2022 in Blockchain by Aditya
 • 7,680 points • 856 views
0 votes
1 answer

On-Chain NFT: How to store a pixel image on the ethereum blockchain?

The images are usually not stored in ...READ MORE

Feb 24, 2022 in Blockchain by Aditya
 • 7,680 points • 856 views
0 votes
1 answer

Need to do pdf file to blockchain and how to do?

Hi @Sagara, Attaching the pdf directly to the blockchain ...READ MORE

Oct 19, 2020 in Blockchain by Gitika
 • 65,910 points • 856 views
+1 vote
1 answer

Can we pass string values to the contract which holds bytes 32 only?

A string is not byte32 and so ...READ MORE

Aug 26, 2019 in Blockchain by Rina
 • 856 views
0 votes
1 answer

Could I share ledger between channels in hyperledger?

You say that you want to use ...READ MORE

Aug 3, 2018 in Blockchain by Johnathon
 • 9,090 points • 855 views
0 votes
1 answer

TypeError: XMLHttpRequest is not a function when using web3 on meteor server side

I had the same problem. Instead ethereum:web3 Meteor package ...READ MORE

Oct 10, 2018 in Blockchain by Omkar
 • 69,210 points • 854 views
0 votes
1 answer

How to control a malicious user in hyperledger fabric?

Fabric is an implementation of blockchain. Blockchain ...READ MORE

Jun 29, 2018 in Blockchain by Omkar
 • 69,210 points • 852 views
+1 vote
1 answer

How to generate Bitcoin address?

Convert the hex string back to bytes ...READ MORE

Aug 20, 2018 in Blockchain by slayer
 • 29,350 points • 850 views
0 votes
1 answer

What is sent to a non-validating notary service when corda transaction is sent?

The transaction is first filtered in the ...READ MORE

Jul 23, 2018 in Blockchain by digger
 • 26,740 points • 849 views
0 votes
1 answer

Sawtooth Invalid Batch or Signature

The problem is in setting the batch ...READ MORE

Jun 16, 2018 in Blockchain by charlie_brown
 • 7,720 points • 849 views
0 votes
1 answer

What exactly is BigChainDB?

Technically, BigChainDB internally uses RethinkDB as a ...READ MORE

Jul 11, 2018 in Blockchain by Shashank
 • 10,400 points • 848 views
0 votes
1 answer

Getting error when i execute ./byfn.sh -m up command.

The error is caused because you're trying ...READ MORE

Jul 12, 2018 in Blockchain by slayer
 • 29,350 points • 847 views
+1 vote
1 answer

Deploy contract using solcjs

Try to add some typo and run ...READ MORE

Sep 26, 2018 in Blockchain by slayer
 • 29,350 points • 845 views
0 votes
1 answer

Geth console can’t access smart contract

You are running commands using an object ...READ MORE

Jan 27, 2019 in Blockchain by Omkar
 • 69,210 points • 844 views
0 votes
1 answer

How do you obtain the transaction uuid after submitting an invoke transaction using the nodejs HFC

The results returned via the 'submitted' event ...READ MORE

Sep 14, 2018 in Blockchain by slayer
 • 29,350 points • 841 views
0 votes
1 answer

What is the peer node start in hyperledger?

Nodes are the fundamental element of the ...READ MORE

Jul 9, 2018 in Blockchain by digger
 • 26,740 points • 841 views
0 votes
0 answers

hd wallet bip44 in js - how to create an address for a chain other than bitcoin?

I have a small script basically taken ...READ MORE

Mar 2, 2022 in Blockchain by Aditya
 • 7,680 points • 837 views
0 votes
0 answers

Blockchain API to determine transaction confirmations

I am trying to identify whether a ...READ MORE

Mar 1, 2022 in Blockchain by Soham
 • 9,700 points • 837 views
0 votes
2 answers

VBA code leads to #value! in cell but works in immediate box

Function GetPrice(strTicker As String, Optional dtDate As ...READ MORE

Sep 10, 2018 in Blockchain by Garry
 • 837 views
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