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Questions tagged [private-blockchains]

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What is single member blockchain?

I just heard about single member blockchains like quorum and hyperledger-fabric. So what does single member mean? Is this some kind of restriction or what?
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1answer
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Permissioned blockchains on EVM: are these private ledgers os it all on ETH main net?

Private blockchains using EVM: is this really the equivalent of the library of tools in hyper ledger or do these blockchains run on the public main net?
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Media sharing on private blockchains

How can files (documents, bulk scanned copies, images, etc.) be stored or sent on a private enterprise blockchain? Is it possible to include such large files in the block, as opposed to small ...
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1answer
45 views

Do private blockchains need consensus protocols?

My understanding is that in a private blockchain, the participating nodes verify and agree that the block is valid and only then add it to the blockchain.In this scenario, are consensus protocols (...
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2answers
65 views

Is it logical to use “Proof-of-Authority” for a “public” blockchain?

According parity.io website: Proof-of-Authority is a replacement for Proof-of-Work, which can be used for private chain setups. And also: The chain has to be signed off by the majority of ...
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Private Blockchains: Potential rudimentary distributed cryptographic filesystem?

I have seen examples of people using public blockchains to store data of all types, everything from basic text to photos and music, encoded into fake addresses. This got me thinking.. about a ...
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1answer
144 views

How to setup a Bitcoin private net that can simulate the public net?

I have some experience in Ethereum-related development and it was very easy to set up a private net with Ethereum that simulate the public main net, I just create a custom genesis block json config, ...
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1answer
386 views

How to reset bitcoin testnet

I'm running a private bitcoin network and would like to reset the bitcoin blockchain data back to the genesis block. I've tried deleting all the files in ~/.bitcoin/blocks and ~/.bitcoin/wallets ...
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1answer
2k views

How to hack a Password of Private Key

I have a Private key and then after I entered it, there's another saying "Input a required Password of Private Key" So how can I hack or generate that?
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1answer
808 views

How can I get a private key for this address

Is it possible for me to withdraw my bitcoin I invested here? I don't have the private key
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49 views

Private key recovery from blockchain

I was recently paid in Bitcoin by a broker. Suddenly they lost the private key to the Bitcoin. I gave them my login and password to send them. They locked them until I paid their fee. When I paid they ...
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2answers
155 views

Why are blocks in a permissioned blockchain linked together?

My question: Do the blocks in a blockchain without proof-of-work (i.e. a permissioned blockchain) have to be linked together via a cryptographic hash? Longer version of my question: (Please correct ...
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1answer
289 views

How to set up a private chain/local testnet : reverse engineering the blockchain code

Long story short, I want to set up a private chain/a testnet blockchain that can run locally just to fiddle and play with it just to learn how it works. So I have a general understanding of how things ...
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1answer
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Share private data and prevent data forwarding

Let's say A has some private medical records of patients and B is a pharmaceutical company who wants to view medical records from A to find out the effect of a particular drug on the patients (run a ...
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1answer
70 views

I lose my private key on my blockchain wallet [duplicate]

Can you please tell me how can I get my blockchain private key. I want to sell my coins. Please help me.
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1answer
81 views

Blochchains that support data privacy and/or strengthen parties pseudonymity

Question 1: Is there any blockchain that allows users to store their private data in the chain? For instance, the transactions and amount of Bitcoin one has is hidden from others. Question 2: Is ...
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3answers
170 views

What is the main difference between “ enterprise” blockchain and regular blockchain?

We have some blockchain-based cryptocurrencies such as Bitcoin or Ethereum. On the other hand, we have some blockchain-based frameworks such as hyperledger and R3 that are designed for businesses. ...
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2answers
2k views

Blockchain as a service - is this really just a replacement trusted third party?

One of the key tenets of Blockchain technology is that it is a trustless, distributed ledger which removes the need for a trusted (but hackable) third party to oversee the veracity of transactions (e....
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3answers
906 views

How would a centralized block chain work?

If I'm a company who pays my employees and my supply chain with my own currency created on a block chain and they can spend it wherever it is accepted, would I need a POW or POS scheme to maintain the ...
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1answer
25 views

Blockchain: Using same blockchain based application on different systems

I am building a Blockchain-based project on supply chain management, where each user and company would have to sign up with their email addresses and will have a usual password. Each time a new ...
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0answers
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If Incentive is a Cornerstone of Bitcoin, how is blockchain useful in enterprise

The Bitcoin Paper talks about how an attacker with more CPU power than what honest nodes control might be ablet to change transactions and double spend their coins. But because each block awards a ...
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0answers
48 views

use block chain without using bitcoin based payment

I am beginner to bitcoin. I intend to develop a proprietary mobile app to trade some kind of commodity among multiple users( with a optional arbitrator in between but not a must). I got interested ...
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1answer
308 views

In a private blockchain network, can we delete the first N blocks and reassign the N+1th block as the genesis block?

I am aware of the data loss caused by deleting the first N blocks. But I am curious to know whether such a task is possible or not. If so, how to practically implement it?
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1answer
364 views

IBM Hyperledger Fabric Running Multiple Nodes on Multiple Datacenters & PCs

At the moment I'm playing around with some of the Hyperledger Fabric demos that IBM has on their cloud platform Bluemix. When you initially spool up an instance you're offered more than one option ...
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1answer
468 views

Blockchain use in Record Management

From my understanding of blockchain, I feel the main use of blockchain is to do something in a decentralised way as compared to the traditional centralised way which involves a middle man. Usually, ...
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0answers
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Are there uses for permissioned blockchains when there is only one party?

According to this answer on my last question, permissioned blockchains are useful when you know the identity of parties but not necessarily trust them to operate as specified. My question here is: is ...
4
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1answer
384 views

What is the point of a permissioned blockchain?

As far as I understand, the whole point of a blockchain is to prevent failures of the kind where a node produces arbitrary data with malice - i.e., to guard against the case you don't trust some nodes ...
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2answers
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Blockchain implementation in banks

Implementation of Blockchain in banks is said to be the new trend now. My question is: Would the private blockchain be kept private in a bank or will it be shared among a group of banks (or even ...
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1answer
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Visa, MasterCard or any other network copy Bitcoin blockchain tech?

I read an article (below) that explained how complicated the payment industry is and thus is why it is relatively expensive. Could a network like Visa eventually copy Bitcoin, and thus cut everyone ...
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2answers
687 views

What is special about a private blockchain based on proof of stake?

I recently came across a paper published in 1988 called "A quorum-based commit and termination protocol for distributed database systems". I could not read it because it is not free, but to me this ...
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2answers
985 views

Why are banks and other centralized entities interested in block chains?

Apparently banks and other centrialized entities are interested in block chain technology. My question is, why? The whole point of block chains is for decentralized, trustless, consensus. Bitcoin, ...
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1answer
163 views

How can I create and distribute my own private blockchains in a scalable way?

I would like to experiment with blockchains in a controlled environment for fun and/or development purposes. Is there a way to do this easily?
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3answers
1k views

How do I remove hard coded seeds from the bitcoin source code?

I'm experimenting with blockchains at home and in my debug logs are lots of errors showing that my nodes are trying to get addresses from the hard coded seed nodes, I know I can use connect to turn ...
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2answers
10k views

How many block chains exist?

I´m beginner and I understood there is an unique huge common block chain to be used by world wide and there a several different crypto currencies types by running on that . Am I correct? Thank you ...
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2answers
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What are the advantages of using my own blockchain versus the Bitcoin blockchain?

Let's say I have a project that takes advantage of blockchain technology. Now I see a number of banks dropping the Bitcoin blockchain for their own. I'm sure that has something to do with secrecy, but,...
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1answer
172 views

Pegged transfer from private blockchain to sidechains - Issue

I am trying to do a pegged transfer from one of my private blockchain to a sidechains using sidechain-manipulation.py (https://github.com/ElementsProject/elements/blob/alpha/contrib/sidechain-...
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7answers
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Is a private blockchain better in any sense than a database?

Since the banks appear to be currently looking into the idea of "blockchains" but don't want to be dealing with "Bitcoin", it seems that there is a lot of hype for private blockchains out there like ...