Hello guys,


I was looking for informations about private blockchains. Some say it's crap, some say it can save money compared to a database for a company in some cases.
I'm not a developer so my vision is on the business-side. Databases are convinient and easy to implement in most systems. My question is why and in which cases a private blockchain would be better and how to implement it ?
Do you have some information about how would it save money ?


Thanks in advance if someone responds

[Bitcoin digital signatures]

Hello guys,

I have a question regarding Bitcoin digital signatures :

On the Bitcoin network, when

- Bob sends a transaction to Alice's public Key and signs using his private key, what is the method used to sign ? In my understanding, the transaction would be hashed in SHA 256 and then encoded with the private key.

- Alice receives the transaction and needs to verify its validity : she decrypt the signature using Bob's public key, and this is where I don't really understand anymore. Like when she decrypts the signature, she then has the hash of the transaction right ? Because the transaction was hashed by Bob, so she can't immedialty get the original transaction at this moment, or she can ? So how can she get the original transaction with the hash of this transaction, because we can't reverse it, right ? Like if a document is hashed and encoded with a private key, then if I decrypt it with a public key, will I get the original document, or will I just get the hash of this document ?

- When she finally gets access to the transaction, then she would have to hash the transaction she received to compare the result with the hash she got ? This way she is able to know if it's bob who sent the document and if the document wasn't modified, right ?

Thank you to the guys who will respond, if any
I'm not really into cryptography or programming so it can be pretty hard to understand sometimes.

[deeply/the process]

Hello guys,

I couldn't find proper explanation to this, so I would like to ask you something.

For the Bitcoin cash hard fork, I understand that BCH ABC and SV had to do a hash competition in order to mine the maximum blocks and validate them because in the Bitcoin protocol the longest chain will be considered as valid.

But I don't exactly understand it deeply/the process :

Like, there is bitcoin cash blockchain and then 2 group of miner decide to create two smaller blockchains (ABC and SV?) How does it work ?

When guys from ABC or SV mine blocks, they do it on Bitcoin Cash blockchain right ? So why do this result in 2 different blockchain (are the blocks mined simultaneously ?) and how does it work when a group wins, like who is going to change the parameters of the Bitcoin cash blockchain once a group give up ? (to apply the opcodes of ABC for example).

I hope you see where I want to go, like I understand the general idea but I would like to understand it more deeply : the hard fork process, why the 2 chains are created and how, and how they choose the winner & apply the changes to the blockchain.



Many thanks to thoose who will respond... I'm not a developper so it can be pretty hard to understand, just want to educate myself maximum about this then to be able to answer to other people

I will also read any link you send if any.