The world of cryptocurrencies today revolutionized the economy and how people think. Still, if we lower the level, we will see that all those currencies that we know are based on the technology called: Blockchain.
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What is the blockchain?
The blockchain is a chain of blocks. It is a UNIQUE registry consensual and distributed in several nodes of a network.
What power does it give to the developing world?
Basically, we can have a registry saved in an unalterable network. We can save critical information and then consult it. Today, the most critical thing for people is their money. This is why applications based on the economy, or cryptocurrencies, were so successful.
Why is it so safe?
Because each block has a specific and immovable place within the chain because each block contains information about the previous block’s hash. The complete chain is stored in each node of the network that makes up the blockchain, so an exact copy of the chain is stored in all network participants.
As new records are created, they are first verified and validated by the nodes on the network and then added to a new block linked to the chain.
Suppose that there is an attacker who wants to alter the network. He should cancel all the nodes of the network since it is enough that at least one is operational for the information to be available.
So the great advantage that it has is that it allows us to store information that can never be lost, modified or deleted.
And how do I start my path to developing applications on the blockchain?
Applications based on the blockchain are called dapps, decentralized applications. It is a type of application whose operation does not depend on control points or central servers, but works based on a decentralized network. This path arises because an application can be deployed in a network, called a smart contract. Some of the networks that allow this are: Ethereum, Tron, BSC (Binance Smart Chain).
And in what language do I program this smart contract?
The most popular language used for these contracts is Solidity, a language similar to Javascript in syntax, but enriched with Object-Oriented Programming concepts such as C ++.
And who is in charge of deploying my contract on the network?
Those who are in charge are the nodes of the network, called miners, but they do not do it for free, to maintain these nodes, it is necessary to offer some type of reward. They mostly do it in exchange for cryptocurrencies, and for this reason, the concept of Gas arises.
What is Gas?
Gas is the cost associated with carrying out each of the operations on the network. Depending on the complexity of our program or smart contract, we will have a higher or lower Gas expense. When we talk about complexity, we must think in terms of computational instructions.
Do I have to pay if I want to prove my contract?
No, there are test networks, testnets, in which you can get test coins totally free. Therefore you can test your contract in a test network before finally putting it into production.
These are the basic concepts to understand the blockchain and be able to start developing Dapps.
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