Unveiling Blockchain’s technology and its mechanisms

Blockchain technology is increasingly being proposed as an innovative solution, even in heterogeneous industrial sectors.

In order to learn how to evaluate its effective and concrete uses in different scenarios and use cases, it is necessary to understand the basic concepts of Blockchain technology.

“Blockchain Fundamentals” is aimed at all those (be they companies, professionals, students) who are interested in knowing and understanding the characteristics of Blockchain technology from the basics.

The proposed contents can be successfully enjoyed even by an audience that does not have specific technical skills, and previous experience in the blockchain field is not required to follow the contents.

Introducing the Blockchain

Essentially, the Blockchain is a

• distributed archive

• based on peer-to-peer networks

• implemented through encryption

As a distributed and decentralized archive, aimed at managing the transfers of digital assets, the Blockchain allows users to exchange digital values with each other in the form of transactions.

Let's now see the Blockchain goals and how they are met by the underlying technology.

Blockchain's Goals

Blockchain technology was originally introduced to support Bitcoin.

The main purpose was to prevent the phenomenon of double spending of cryptocurrencies, i.e. the possibility of spending the same currency several times.

However, the role of the Blockchain is not limited to the financial transaction sector.

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Blockchain core concepts

We'll now introduce the concepts on which Blockchain technology is based, such as distributed archiving, decentralized peer-to-peer networks, transparency and irreversibility of transactions.

Distributed Archiving

The ability to store data within a distributed database allows each participant to access the complete transaction history.

In addition, distributed archiving prevents a single entity from taking full control over the archived information.

Distributed archiving allows individual nodes to directly and independently verify the integrity of the information stored.

It is therefore not necessary to use third parties or intermediaries to carry out the verification of transactions.

Let's now see how peer-to-peer networks help implement distributed storaging of transactions in the Blockchain.

Peer-to-peer networks

To implement distributed storage, the blockchain uses Peer-to-peer (P2P) networks.

In this type of network, no node assumes the role of central server.

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Centralized versus Decentralized networks

As we have seen, one of the basic principles of the Blockchain involves the use of a Peer-to-peer network communication protocol, in order to achieve the decentralized storage of the information.

To understand the advantages associated with decentralized networks, we will first introduce traditional centralized networks, analyzing their main characteristics, then comparing them with decentralized peer-to-peer networks.

Centralized networks (Client-Server)

In the following image, we show a typical example of a centralized network:

The main feature of these types of networks is the presence of a central node, acting as the server node.

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Blocks, the building elements of Blockchain

The Blockchain, as the name states, is nothing more than a chain of blocks.

The simplest unit of a blockchain is in fact constituted by the block.

Each block contains within it a certain number of transactions that represent the transfers of values ​​between the counterparties, carried out within the blockchain.

Blocks and transactions

Each block contains batches of transactions with their hashes.

The number of transactions contained in a block depends on the block size.

The average size of a block is about 1 MB, but it can even reach larger sizes, as in the case of Ethereum.

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Blockchain transactions - Nature and characteristics

The Blockchain, as the name states, is nothing more than a chain of blocks.

The simplest unit of a blockchain is in fact constituted by the block.

Each block contains within it a certain number of transactions that represent the transfers of values ​​between the counterparties, carried out within the blockchain.

Transactions and Distributed Ledger

One of the characteristics of Blockchain is that it makes the intervention of intermediaries in transactions superfluous.

People can carry out transactions without third parties being involved. The shared ledger itself manages and ensures the integrity and reliability of transactions between the parties.

The ledger is maintained and updated in a distributed manner by all participants in the blockchain, and all nodes taking part of the networks can verify the reliability of transactions without resorting to trusted third parties.

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Assuring transactions integrity

How is the integrity of transactions guaranteed within the Blockchain?

This is what we will deal with now, analyzing the different cryptographic features, such as hashing and hash digests, highlighting the differences that exist with the actual encryption algorithms.

Finally, we will show a practical example of calculating a hash digest using the class of SHA algorithms used in the implementation of the Blockchain, using simple tools available online.

Hash digests: the fingerprints of the blocks

Let's start by showing the hash digests, considered the "fingerprints" of the blocks of the Blockchain.

As we have said, the integrity of transactions within the blockchain is achieved through the use of hash functions.

Hash functions constitute a class of algorithms that make it computationally unlikely that different alphanumeric strings will give rise to equal hash values.

Hashing algorithms are specifically designed to be sensitive to even the slightest variations in the input data.

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