13 votes

What can blockchain do that normal databases systems won't?

Blockchains are data structures, whose only advantage is that storing data in that structure allows you to achieve decentralization under certain conditions. So your question reduces to "how is ...
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9 votes

Is a private blockchain better in any sense than a database?

It depends on what you mean by "private". The word private is not really associated with Eris as far as I can tell. Rather, the word "permissioned" is used instead, and therein lies all the difference ...
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  • 206
9 votes

Is a private blockchain better in any sense than a database?

Signed commitments with immutable history are all that’s required for proof of integrity. Moreover, assuming commitments are immutable (transactions can only be reversed by adding a new commitment ...
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9 votes

What can blockchain do that normal databases systems won't?

This is hard to answer, as "blockchain" isn't a very well defined thing. Often the term refers to some use of cryptography in a distributed system, but what it means beyond that depends on who you ask....
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8 votes

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

Speaking as someone who has worked on a blockchain project for a bank, I can tell you that banks are interested for several reasons. Banks know they are ripe for disruption Due to a combination of ...
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  • 8,734
7 votes

Is a private blockchain better in any sense than a database?

Private blockchains can be seen as a new method for ensuring consistency in a distributed database, even if that database is an environment of perfect trust. There is an equivalence between how a ...
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5 votes

How many block chains exist?

@Davide's answer is correct but I expand the explanation a bit particularly regarding the blockchain. I´m beginner and I understood there is an unique huge common block chain to be used by world ...
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  • 2,204
5 votes

Is a private blockchain better in any sense than a database?

Researcher Arvind Narayanan stated his opinion on this matter in his post “Private blockchain” is just a confusing name for a shared database: It is true that adding signatures and hash pointers ...
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  • 151
5 votes

Visa, MasterCard or any other network copy Bitcoin blockchain tech?

It would make no sense for Visa to copy Bitcoin. Visa is a company built around control of a payment network. Visa's system only works because they control access and payment verification, which is ...
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  • 64.4k
4 votes

How can I get a private key for this address

How can I get a private key for this address There is essentially no way. Is it possible for me to withdraw my bitcoin I invested here? I don't have the private key No. It looks like you fell ...
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4 votes
Accepted

What is the point of a permissioned blockchain?

If your nodes are trusted, though, a blockchain isn't necessary at all, you know the code isn't malicious. So what is the point of a permissioned blockchain? Knowing someone's identity is not ...
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  • 28.7k
3 votes

Is a private blockchain better in any sense than a database?

Blockchain is a mere chain of blocks and this respect is worse than every database on earth. What makes the public blockchain unique is the proof-of-work that ensures that thousands of copies of the ...
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  • 234
3 votes

How many block chains exist?

There are thousands of identical copies of the Bitcoin blockchain which is kept in sync worldwide thanks to its protocols. You can consider that like a single-instance super-redundant data structure. ...
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  • 234
3 votes

What are the advantages of using my own blockchain versus the Bitcoin blockchain?

The Bitcoin blockchain is maintained and secured by people throughout the world: miners. They take care of the security and validation of the decentralized consensus rules. The incentive for those ...
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  • 2,204
3 votes
Accepted

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

There are a few ways to do it, I personally went into src/net.cpp and commented out the if condition that triggers the lookup starting at line 1266. // if (addrman.size() == 0 && (GetTime() - ...
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  • 686
3 votes
Accepted

How to reset bitcoin testnet

The testnet data directory is not ~/.bitcoin but rather ~/.bitcoin/testnet3. ~/.bitcoin holds the data for the main Bitcoin blockchain.
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  • 62.3k
3 votes

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

First lets distinguish between a blockchain and Blockchain as a Service (BaaS), because they're two different things. Bitcoin, and other crypto-currencies, use a distributed ledger in a peer-to-peer ...
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  • 133
3 votes

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

What is the reason? And Is it logical to use "Proof-of-Authority" for a "public" blockchain, in sense of keeping decentralization? Proof of Authority is, by definition, centralised. If the authority ...
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  • 16.5k
3 votes

Perfect option scammed

They're an obvious scam. I mean, absurdly obvious. I'm really baffled how anyone could fall for something like this. If someone had a way to reliably invest $10,000 and turn it into $120,000 in a ...
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2 votes

Why are blocks in a permissioned blockchain linked together?

I think you're mistaking PoW for a mechanism that guarantees the chain's correctness, rather than just a means for finding consensus. A blockchain (without PoW) is just an ordered list of batched ...
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2 votes
Accepted

What is the main difference between " enterprise" blockchain and regular blockchain?

The line between a blockchain and a distributed database (or ledger) is currently blurred (some would say deliberately so given the hype surrounding "blockchains" at the moment). R3 have recently ...
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2 votes

Permissioned or Permissionless blockchain? Which one is PoS more adapted for?

Frankly, I don't think your definitions are useful. But by your definitions, PoS makes a network permissioned by definition. In a proof-of-stake network, you can only participate in the validation of ...
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2 votes

Bitcoin private network on Amazon EC2

I want to be able to control how the different nodes are interconnected to each other in this network. Is there a way to do this on Bitcoind? As per bitcoin.conf I suggest setting up the connect = X....
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  • 1,584
1 vote

How to hack a Password of Private Key

The private key you have is encrypted so to decrypt it you need to have a valid password that's why it is asking for the password. It can't be hacked, you need a correct password
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1 vote

How can I get a private key for this address

Please note, you should never pay for a Blockchain Wallet private key. To receive a bitcoin, you only need to provide the sender with a bitcoin address from your wallet. I'm sorry to hear about the ...
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  • 11
1 vote

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

The question slightly exceeds capabilities of this q&a forum. Maybe better to search bitcointalk.org, there these type of requests get often discussed. Join one of the discussions there! Anyhow, ...
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  • 5,026
1 vote

Share private data and prevent data forwarding

Nothing can prevent B from exposing or forwarding the data once he has access to it.
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  • 3,136
1 vote

Blochchains that support data privacy and/or strengthen parties pseudonymity

For question 1 and 2, ZCash (not Zikas) provides some solutions. It's based on Bitcoin's code and has 2 types of addresses: non-shielded: they behave exactly like normal Bitcoin addresses shielded: ...
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  • 1,254
1 vote

How would a centralized block chain work?

Sure. You just use a database that keeps track of who has how much money. You can do this any way you want. You don't need anything fancy like POW, POS, or even a blockchain. The only reason you would ...
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1 vote

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

With blockchains, you can basically do anything with a hard fork. In the case of private blockchains, you will have a much easier time getting consensus for a hard fork, perhaps as easy as the ...
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  • 8,734

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