Is the following definition of blockchain by its wikipwdia page correct?
Where it is mentioned:
A blockchain is a decentralized, distributed and public digital ledger ...
Cannot we have a private blockchain? And if so, is the above proposition wrong ? when it says always a blockchain is public.
An example: Consider a company or organization which aims at using (permissioned) blockchain such that it is visible only for its (internal) employees. So, it uses ex. visibility property of blockchain but limited only to internal employees.
Please Note that here the question is NOT if using a permissioned blockchain is logical or not, but also the question is the exact definition of a blockchain. So, according to definition of blockchain in its wikipedia page, a permissioned blockchain is real blockchain?
From my point of view: to have a blockchain with immutable transactions history, we need the blockchain to be maintained by a decentralized consensus, otherwise in case of using ex. PoA or permissioned approach, since it's a centralized approach, there is no guarantee for a blockchain user that in future what happens for the blockchain and if the blockchain will exist after years? So, in this case, there is no guarantee for existing transactions history in future. And at this point question is why do we use such a blockchain?