Most voted questions in Blockchain

+1 vote
4 answers

What is hf.Registrar.Roles in fabric-ca-client command?

The "hf.Registrar.Roles" attribute is used to control ...READ MORE

Jul 11, 2018 in Blockchain by slayer
• 29,330 points
1,754 views
+1 vote
2 answers

Where is custom chaincode path Hyperledger Fabric 1.0?

You have to have your chaincode at ...READ MORE

Jul 10, 2018 in Blockchain by slayer
• 29,330 points
2,354 views
+1 vote
1 answer

What is blockchain apart from bitcoin?

Blockchain is a decentralized database where the ...READ MORE

Jul 9, 2018 in Blockchain by digger
• 26,740 points
253 views
+1 vote
4 answers

Where does hyperledger fabric store the database for the blockchain?

The data of the Hyperledger Blockchain is ...READ MORE

Apr 29, 2019 in Blockchain by Tina
2,147 views
+1 vote
2 answers

How do I access the api generated by hyperledger composer publicly?

IBM Bluemix is a platform that provides ...READ MORE

Jul 5, 2018 in Blockchain by slayer
• 29,330 points
735 views
+1 vote
1 answer

How to write an ERC 721 contract?

You could go through the following links:  https://github ...READ MORE

Jun 28, 2018 in Blockchain by Perry
• 17,100 points
2,281 views
+1 vote
1 answer

Does the client know which peer approves/supports its transaction in Hyperledger Fabric?

Yes, client is aware of the endorsing ...READ MORE

Jun 27, 2018 in Blockchain by Omkar
• 69,190 points
496 views
+1 vote
2 answers

How to convert INT to STRING in Solidity?

Look at the following code : function uintToString(uint ...READ MORE

Jun 27, 2018 in Blockchain by Christine
• 15,790 points
9,958 views
+1 vote
1 answer

Can there be multiple Hyperledger Fabric CA servers in the same blockchain?

Yes, you can run multiple CA servers ...READ MORE

Jun 27, 2018 in Blockchain by Omkar
• 69,190 points
1,842 views
+1 vote
5 answers

Does Hyperledger remove asset actually remove anything?

Hyperledger remove asset doesn't actually "remove" the ...READ MORE

Jun 19, 2018 in Blockchain by charlie_brown
• 7,720 points
2,685 views
+1 vote
2 answers

How to return value from a chaincode in Hyperledger Fabric?

Hyperledger Fabric supports only 2 types of ...READ MORE

Jun 13, 2018 in Blockchain by Perry
• 17,100 points
2,148 views
+1 vote
1 answer

How can I add image into my Hyperledger instance

In your registry, you can Base64-ify your ...READ MORE

Jun 8, 2018 in Blockchain by aryya
• 7,450 points
1,388 views
+1 vote
1 answer

Car lease demo database location in IBM blockchain

Firstly, yes you can change the default DB ...READ MORE

Jun 7, 2018 in Blockchain by Christine
• 15,790 points
1,121 views
+1 vote
4 answers

What is the asset, key-value pair in hyperledger fabric?

Let me explain with an example. Suppose ...READ MORE

May 2, 2019 in Blockchain by Kiran
2,234 views
+1 vote
1 answer

How do I develop enterprise solutions using hyperledger composer?

With IBM cloud you can use containers, ...READ MORE

May 15, 2018 in Blockchain by Shashank
• 10,400 points
272 views
+1 vote
2 answers

What if a bitcoin clients could create identical private keys?

If this happens, then Person B will ...READ MORE

Aug 28, 2018 in Blockchain by Evan
314 views
+1 vote
2 answers

How can a public proof of work be secured?

Bitcoin was the first implementation of blockchain, ...READ MORE

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

How is ordering of transactions done in a block in hyperledger?

Consensus is the key concept for validating ...READ MORE

May 3, 2018 in Blockchain by Christine
• 15,790 points
780 views
+1 vote
2 answers

How can I use blockhain for storing a proof of a document such as an image?

Yes, you're right. Saving entire image in ...READ MORE

Aug 28, 2018 in Blockchain by hakusaro
435 views
+1 vote
1 answer

What are peers and how a user enrolls into a specific peer?

In fabric, there is an admin, he ...READ MORE

May 3, 2018 in Blockchain by Shashank
• 10,400 points
1,402 views
+1 vote
5 answers

Where does the smart contracts stored and executed on blockchain?

Ethereum smart contracts are executed on EVM ...READ MORE

May 3, 2018 in Blockchain by Shashank
• 10,400 points
7,776 views
+1 vote
1 answer

How can nodes interact with a Smart Contract?

If you are using Remix IDE to ...READ MORE

Apr 27, 2018 in Blockchain by Perry
• 17,100 points
334 views
+1 vote
1 answer

Error while deploying chaincode in IBM Blockchain. Please help.

Try stripping out the 'tree/master' portion of ...READ MORE

Apr 26, 2018 in Blockchain by Christine
• 15,790 points
460 views
+1 vote
1 answer

What happened on deploy, invoke and query in Hyperledger chaincode?

1. Deploy: During Deploy the chaincode is written onto ...READ MORE

Apr 26, 2018 in Blockchain by Christine
• 15,790 points
1,022 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
• 15,790 points
1,429 views
+1 vote
1 answer

What'd be the best database to store data on blockchain?

To read and add data you can ...READ MORE

Apr 25, 2018 in Blockchain by Christine
• 15,790 points
953 views
+1 vote
1 answer

How to store state data in Ethereum blockchain?

You won't have to overwrite the whole ...READ MORE

Apr 25, 2018 in Blockchain by Shashank
• 10,400 points
502 views
+1 vote
1 answer

what is use of msg.sender in solidity code?

msg.sender(address) function indicated the sender of the ...READ MORE

Apr 25, 2018 in Blockchain by Shashank
• 10,400 points
7,495 views
+1 vote
1 answer

Can I mine a specific transaction on ethereum?

On a public ethereum network it is ...READ MORE

Apr 24, 2018 in Blockchain by Shashank
• 10,400 points

edited Oct 6, 2021 by Sarfaraz 929 views
+1 vote
1 answer

What is the best way to search for an item in blockchain?

All transactions and records in blockchain are ...READ MORE

Apr 21, 2018 in Blockchain by Perry
• 17,100 points
958 views
+1 vote
1 answer

How immutability is achieved in hyperledger fabric?

Since it is a private blockchain platform, ...READ MORE

Apr 21, 2018 in Blockchain by Perry
• 17,100 points
1,055 views
+1 vote
1 answer

How can I achieve a functionality where an action is performed after a payment is received?

See this can be achieved in more ...READ MORE

Apr 21, 2018 in Blockchain by Perry
• 17,100 points
252 views
+1 vote
1 answer

Which data structure to prefer to model a blockchain?

To start with, let me tell you ...READ MORE

Apr 21, 2018 in Blockchain by Perry
• 17,100 points
2,299 views
+1 vote
2 answers

What is a blockchain and ethereum?

Some of the use-cases are: Healthcare Medical records are ...READ MORE

Aug 9, 2018 in Blockchain by Omkar
• 69,190 points
421 views
+1 vote
1 answer

Is it possible to store blockchain in a sql or no-sql database?

Currently, following are the options to store ...READ MORE

Apr 21, 2018 in Blockchain by Perry
• 17,100 points

edited Aug 9, 2018 by Omkar 554 views
+1 vote
1 answer

How does a blockchain work in hyperledger framework?

Hyperledger Composer simplifies application development on top ...READ MORE

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

How can I modify stored data in blockchain??

One of the important feature of a ...READ MORE

Apr 18, 2018 in Blockchain by Christine
• 15,790 points
4,247 views
+1 vote
4 answers

How PBFT algorithm works?

PBFT is a way for a distributed ...READ MORE

Apr 25, 2019 in Blockchain by Kiran
6,724 views
+1 vote
1 answer

How is it possible to achieve privacy and confidentiality in smart contracts??

Any contract code written on the blockchain ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
• 10,400 points

edited Aug 7, 2018 by Omkar 529 views
+1 vote
1 answer

What are the differences between blockchain programming and our traditional programming languages?

On higher level comparison, there are quite ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
• 10,400 points
735 views
+1 vote
1 answer

How can I initiate a transaction on ethereum private network using mobile device?

There is no android wallet to connect ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
• 10,400 points
520 views
+1 vote
1 answer

Where does hyperledger stores stores assets and participants??

There are two places where hyperledger stores ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
• 10,400 points
358 views
+1 vote
1 answer

How to setup testnet environment in Ethereum??

You can connect to a node using ...READ MORE

Apr 18, 2018 in Blockchain by Shashank
• 10,400 points
390 views
+1 vote
1 answer

How can I connect my main Ethereum network to Web3.py using python?

All you need to do is enter ...READ MORE

Apr 17, 2018 in Blockchain by Perry
• 17,100 points
917 views
+1 vote
1 answer

Hyperledger - How can I use transaction certificates to enforce privacy?

The transaction certificates don't actually address privacy ...READ MORE

Apr 17, 2018 in Blockchain by Perry
• 17,100 points
493 views
+1 vote
1 answer

How is data retrieved in Ethereum?

Blockchain uses the concept of Merkle trees ...READ MORE

Apr 16, 2018 in Blockchain by Shashank
• 10,400 points
501 views
+1 vote
3 answers

How efficient is Ethereum in regard to its TPS??

TPS means transactions processing at any given ...READ MORE

Apr 16, 2018 in Blockchain by Shashank
• 10,400 points
2,494 views
+1 vote
1 answer

In public blockchains each computer normal user maintain the ledger, is it scalable enough to do so?

To access or use the blockchain you ...READ MORE

Apr 12, 2018 in Blockchain by Johnathon
• 9,090 points
309 views
+1 vote
4 answers

What role does Orderer peer serves in Hyperledger Fabric??

Shared communication channel to clients and peers ...READ MORE

Apr 12, 2018 in Blockchain by Johnathon
• 9,090 points
2,071 views
+1 vote
1 answer

Why is it so difficult to find a nonce while validating a block in Bitcoin?

A nonce is just "some arbitrary number". In ...READ MORE

Apr 11, 2018 in Blockchain by Perry
• 17,100 points
1,557 views