Most viewed questions in Blockchain

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What type of database is blockchain?

Blockchain is a distributed database. what makes ...READ MORE

Mar 30, 2018 in Blockchain by Christine
• 15,790 points
990 views
0 votes
1 answer
0 votes
1 answer

What is the difference between creating a new solidity contract with and without the `new` keyword?

You cannot omit new keyword for creating ...READ MORE

Oct 8, 2018 in Blockchain by Omkar
• 69,230 points
986 views
0 votes
1 answer

SHA256 does not give expected result.

You're hashing the string when you're supposed ...READ MORE

Aug 24, 2018 in Blockchain by digger
• 26,740 points
983 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
980 views
0 votes
1 answer

How to upload data from PC or sensors to blockchain?

you can do it by writing a ...READ MORE

Jul 9, 2018 in Blockchain by slayer
• 29,350 points
980 views
0 votes
2 answers

Warning: Using contract member “balance” inherited from the address type is deprecated. Solidity

Alternatively you could assign this to a local variable ...READ MORE

Oct 3, 2018 in Blockchain by Rustom
979 views
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1 answer

Retrieve epay.info Balance with VBA and Excel

This code should log you in, provided ...READ MORE

Sep 5, 2018 in Blockchain by digger
• 26,740 points
979 views
0 votes
1 answer

Not able to generate WIF from extended private key

I found the answer to this in the ...READ MORE

Aug 29, 2018 in Blockchain by digger
• 26,740 points
979 views
0 votes
1 answer

composer network start with error SERVICE_UNAVAILABLE

I think there is an issue with ...READ MORE

Jul 6, 2018 in Blockchain by aryya
• 7,450 points
979 views
0 votes
1 answer

How can I synchronize smart contract on blockchain?

This is how it is on Blockchain. ...READ MORE

May 29, 2018 in Blockchain by Perry
• 17,100 points
979 views
0 votes
1 answer

GDAX Heartbeat Channel: Failed to subscribe error

You to include "product_ids" : ["BTC-GBP"] as a field ...READ MORE

Sep 7, 2018 in Blockchain by digger
• 26,740 points
977 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
• 69,230 points
976 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
• 69,230 points
976 views
+1 vote
2 answers

Challenge while setting up Hyperledger Fabric 1.0 in Ubuntu 16.04

The rocksdb error you're seeing wouldn't be ...READ MORE

Mar 27, 2018 in Blockchain by ned_crew
• 1,610 points

edited Jun 8, 2020 by Sirajul 976 views
0 votes
1 answer

How to interact with blockchain using Java web app?

You can interact with the blockchain using ...READ MORE

Jul 16, 2018 in Blockchain by digger
• 26,740 points
972 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
971 views
0 votes
1 answer

In hyperledger, how many number of ordering node can take up a transaction?

There are two types to implement ordering: 1. ...READ MORE

Jun 25, 2018 in Blockchain by Omkar
• 69,230 points

edited Jun 28, 2018 by Omkar 969 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
• 69,230 points
966 views
0 votes
1 answer

How do I use hyperledger fabric blockchain to build my own application?

To use fabric I would recommend you ...READ MORE

May 17, 2018 in Blockchain by Johnathon
• 9,090 points
966 views
+1 vote
1 answer

What problem does pow(proof of work) solves in blockchain?

Proof of Work: When a miner gets a ...READ MORE

Aug 6, 2018 in Blockchain by digger
• 26,740 points
965 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
• 69,230 points
964 views
0 votes
1 answer

Ethereum Mist: Compiling Error with sha3

First run: npm install sha3 and then sudo ...READ MORE

Oct 24, 2018 in Blockchain by Omkar
• 69,230 points
962 views
0 votes
1 answer

How to use real world/live data in my smart contract?

You cant access/embed real world data using ...READ MORE

Jul 12, 2018 in Blockchain by digger
• 26,740 points
962 views
+1 vote
1 answer

Unable to convert variable to GMP when initializing Bitpay client class (Laravel)

Bitpay automatically uses the encrypted file store, ...READ MORE

Sep 10, 2018 in Blockchain by slayer
• 29,350 points
960 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
959 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
• 69,230 points
955 views
0 votes
1 answer

How to create address in BitcoinLib.

Regarding this specific library and assuming that ...READ MORE

Aug 21, 2018 in Blockchain by digger
• 26,740 points
955 views
0 votes
1 answer

Not able to execute fabcar demo in Hyperledger

This can be solved by deleting directory ...READ MORE

Jul 24, 2018 in Blockchain by charlie_brown
• 7,720 points
955 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
955 views
+1 vote
2 answers

Can I include real world data in a smart contract? If so, how?

You cant access/embed real world data using ...READ MORE

Jul 18, 2018 in Blockchain by sapan
955 views
0 votes
0 answers

how to Build Bitcoin address and balance database?

How to build Bitcoin Address and Balance ...READ MORE

Jul 25, 2019 in Blockchain by Raj
• 180 points
953 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
• 69,230 points
952 views
+1 vote
1 answer

Unable to send payment using API. Please help.

Firstly, check your passwords, your API code and your wallet ...READ MORE

Apr 3, 2018 in Blockchain by Christine
• 15,790 points
952 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
952 views
0 votes
1 answer

Base58 encoding in ruby?

Seems like a hexadecimal number is stuck ...READ MORE

Aug 22, 2018 in Blockchain by digger
• 26,740 points
951 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
949 views
0 votes
1 answer

python3 pip not working

The name of your package in PyPI ...READ MORE

Sep 4, 2018 in Blockchain by slayer
• 29,350 points
949 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
949 views
0 votes
1 answer

What do we mean by a validating peer?

The term validating peer was used in ...READ MORE

Apr 19, 2018 in Blockchain by Christine
• 15,790 points
949 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
948 views
+1 vote
1 answer

How is a smart contract stored on a Blockchain?

Smart contract template and transaction events are ...READ MORE

Apr 4, 2018 in Blockchain by Christine
• 15,790 points
948 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
946 views
0 votes
1 answer

How to get the current state of a smart contract?

Hey, you gotta provide the contract code, and ...READ MORE

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

How to understand transaction verification in blockchain

They said it takes about 10 minutes ...READ MORE

Jul 17, 2018 in Blockchain by aryya
• 7,450 points
945 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
944 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
942 views
0 votes
1 answer

Why is geth --fast faster in downloading the Blockchain?

When you use the --fast flag to download the Blockchain, ...READ MORE

Jan 10, 2019 in Blockchain by Omkar
• 69,230 points
942 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
942 views