The blockchain its translation into Spanish means "chain of blocks" that chain of blocks is a very well structured system and structured as an accounting book where each block is responsible for keeping a large amount of financial information, but currently this block chain we are using to store any type of information susceptible to be saved under this scheme.

The best part is that this block chain becomes a very secure database because of the number of users known as (nodes) these nodes are those that have the function of verifying all the transactions and in a direct way only the creators of the blocks.

It really is not very difficult to understand the operation and assimilate all the information that can be found. There are many links where you can document about it.

Let's go into the subject, how does the public and private blockchain work?

I think many will agree with me. The chain of blocks is here to stay, unless there is a big explosion but in all the equipment or systems that serve as replicators and verifiers of the chain of blocks worldwide, since this information is stored in each of them and is a faithful copy and thanks to these copies is that you can reconstruct the information that may be susceptible to loss or damage at some point in that chain.

Definition of public blockchain:

^{Source of the image}

A public blockchain, also called open, as its name implies, is one in which anyone can join the network and collaborate with the update of the chain. This means that any member of the community in question can review the information contained in the verified blocks and participate in the process of verification of operations without any type of restriction..
^Source

One of the main chains of public blocks is the Bitcoin, after reading and carrying out an exhaustive investigation in many readings they describe it as public.

A very important feature is decentralization because thanks to that independence a better performance is achieved and any person in the world who wants and can maintain the impression of the block chain as long as it meets specific requirements can participate.

In addition, they get benefits or incentives as long as they do it correctly, the way they get benefit is with bitcoin but there is a condition to be able to have them, there must be a cryptographic verification.

All of them produce information that is registered in the database, and they can access it, since it will be distributed and only having an internet connection massively achieves that all these data are incorporated into their teams and are willing to keep the database, thanks to it large communities can be formed.

Definition of private blockchain:

^{Source of the image}

A private blockchain, also known as closed blockchain, is one that is owned by an individual or institution, which is why it is not allowed for anyone to enter the community and add blocks to the chain. In fact, in order to join the network, it would be necessary to receive an invitation from the network developers.

^Fuente

As the private theory says, it is very clear that not everyone has permission and they do not have access to this type of blockchain, only those that belong to that closed circle can make records in the database, this database will be in private or central servers and only the administrators of these will grant the necessary permissions to be able to access, in many cases only the specific clients that were already registered can enter.

To get access to a private one, you must keep in mind that you have to comply with regulations, rules and requirements to be there.

The verification of the data will always be centralized, that is one of its characteristics the centralization of the chain of blocks.

The incentive that can be received by those who maintain this database will be their own interest since they have the obligation to do it correctly in order to have a reputation on that platform.

Almost always my wife reads the post that I will publish, I can say that she is my editor in chief, she does not know much about the topic, so she asked me for a very simple explanation of how the private and public blockchain works,
I came up with this example:

^{Source of the image}

Imagine that an apartment is a private blockchain where only you are the administrator, the only one that decides which doors are opened, which are closed and which are kept open over all the main entrance, this means that access is limited that only few can go through that door or only to whom she gives permission.

She is the boss and administrator and she is the one who grants the entrance, but even nobody can change those rules unless she decides.

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^{Source of the image}

With regard to the public is that everyone can enter a place and leave, of course complying with some rules as in the private but despite these rules is still public and it turns out that someone who is within this blockchain sees something placed in a form that prevents free access and decides to move it to one side to allow free unfolding and follow.

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Both have their advantages and disadvantages, the blockchain is relatively new with only seven (7) years of its creation, which means that it is currently in the process of improvement within the blockchain technology, in any case they are being used to store any type of information, its scope reaches the medical and scientific as well as economic.

The evolution of this blockchain technology will only be defined by its use both public and private and the need for them will depend on the environment where and how they are used, it can be seen that the public will grow more in the future, all those who interact in it participate in improvements for its improvement and is happening at this time when you read this post and is happening in all parts of the world, we know that its development is constantly evolving.

Certainly the future is uncertain the private blockchain may have a takeoff, however I consider that the access to be able to belong to it is so limited and that would slow it down, I clarify that this is my totally objective point of view.

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^{Original from José Lanz}

^{This work is under licencia de Creative Commons Reconocimiento-NoComercial-CompartirIgual 4.0 Internacional.}

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