Forem: Humberto Junior

Blockchain's Main Characteristics

Humberto Junior — Wed, 15 Oct 2025 18:23:16 +0000

In this article I'm only going to talk about the Main Features of Blockchain: Decentralization, Transparency and Immutability. I'm going to start a series of articles on Blockchain with more in-depth posts. Blockchain is a revolutionary technology that is transforming various sectors, offering a secure and efficient structure for digital transactions. With its decentralized, transparent and immutable database, it guarantees greater trust and efficiency in processes. These three main characteristics are what make Blockchain such an innovative system, which is being widely adopted in areas such as finance, smart contracts and data management.

What is decentralization?
In blockchain, decentralization refers to the transfer of control and decision-making from a centralized entity (individual, organization or group thereof) to a distributed network. Decentralized networks strive to reduce the level of trust that participants must place in each other and prevent their ability to exercise authority or control over each other to the point of degrading the functionality of the network.

Why decentralization is important
Decentralization is not a new concept. When creating a technology solution, three primary network architectures are usually considered: centralized, distributed and decentralized. Although blockchain technologies generally use decentralized networks, a blockchain application itself cannot be categorized simply as decentralized or not. Instead, decentralization is a sliding scale and should be applied to all aspects of a blockchain application. By decentralizing the management and access to resources in an application, a greater and fairer service can be achieved. Decentralization usually has some disadvantages, such as lower transaction throughput. However, ideally, these disadvantages are worth it for the greater stability and service levels they produce.

Benefits of decentralization

Provides a trustless environment: In a decentralized blockchain network, no one needs to know or trust anyone. Each member of the network has an exact copy of the same data in the form of a distributed ledger. If a member's ledger is altered or corrupted in any way, it will be rejected by the majority of network members.
Improves data reconciliation: Companies generally exchange data with their partners. This data, in turn, is usually transformed and stored in each party's data silos, only to resurface when it needs to be transmitted downstream. Each time the data is transformed, it opens up opportunities for data loss or incorrect data to enter the workflow. With a decentralized data warehouse, each entity has access to a shared, real-time view of the data.
Reduces weaknesses: Decentralization can reduce weaknesses in systems where there can be too much dependence on specific actors. These weaknesses can lead to systemic failures, including failure to deliver promised services or inefficient services due to resource depletion, periodic interruptions, bottlenecks, lack of sufficient incentives for good service or corruption.
Optimizes resource distribution: Decentralization can also help optimize the distribution of resources, so that promised services are delivered with better performance and consistency, and also with less chance of catastrophic failure.

*Transparency and security *
Blockchain is a technology that stands out for its ability to guarantee transparency and security in transactions in any area of activity. When applied to logistics or any other sector, it allows precise tracking of products throughout the supply chain. This means that every movement, from manufacturing to final delivery, is recorded in an immutable digital ledger, providing a clear and accessible overview for all parties involved.

THE FUTURE OF BLOCKCHAIN IN LOGISTICS
With the increasing complexity of supply chains, the implementation of blockchain is becoming essential. As companies seek to increase their efficiency and security, the technology presents itself as a viable solution to contemporary challenges. Collaboration between different sectors is facilitated as everyone can access information in real time, which strengthens trust between business partners.

In addition, the ability to audit each transaction transparently brings a new level of responsibility. This not only improves regulatory compliance, but also promotes a culture of integrity in logistics operations. Thus, blockchain is not just a tool, but a strategic ally that can drive innovation and transform the consumer experience. As the market evolves, the future of logistics will be increasingly shaped by this revolutionary technology.

5 MAIN BENEFITS OF BLOCKCHAIN IN LOGISTICS

Transparency: All participants in the supply chain have access to the same information, which minimizes fraud and errors.
Traceability: In the event of problems, such as product recalls, it is possible to quickly identify the origin and route of the item.
Cost reduction: The elimination of intermediaries and the automation of processes can lead to a significant reduction in operating expenses.
Security: The decentralized nature of blockchain increases protection against cyber attacks, guaranteeing data integrity.
Efficiency: The automation of contracts and logistics processes speeds up operations, enabling a more agile response to market demands.

The Blockchain Revolution in Healthcare
In healthcare, blockchain improves the management of medical records. Smart contracts guarantee the confidentiality of patient data, allowing secure and controlled access.

The technology optimizes the pharmaceutical supply chain, tracing medicines from production to distribution and combating counterfeiting. In addition, clinical trials use blockchain to guarantee data integrity.

Immutability and Trust
Immutability protects the integrity of the data on the blockchain. Data cannot be edited, deleted or transferred once it has been recorded, guaranteeing the security and accuracy of the information. Individuals and companies often consider blockchains an option for storing confidential data.

The word “immutable” is sure to appear in the answer. This word is used to define something that can never be modified or changed.

In a blockchain, it refers to the global record of transactions, created by consensus between the participants of a blockchain. The basic notion is this: when a blockchain transaction has received a sufficient level of validation, the cryptography certifies that it can never be overwritten or reversed.

This makes the blockchain different from normal files or databases, where information can be edited and deleted at will. So the theory goes.

In the noisy arena of the blockchain debate, immutability has become a quasi-religious doctrine, a core belief that must not be shaken or questioned.

Conclusion
In an increasingly digital world, Blockchain has emerged as a powerful solution to overcome traditional challenges, providing trust without the need for intermediaries. Its decentralization eliminates single points of failure, its transparency guarantees trust in the system, and its immutability ensures the integrity of information. This triad is the basis for the future of digital transactions.

Sources:

About Wallets

Humberto Junior — Tue, 14 Oct 2025 17:27:06 +0000

In this article I'm going to talk about Wallet, Crypto Browser and Crypto Wallets, these words have emerged along with Web 3.0. Browser wallet extensions are essential tools for exploring Web 3.0. They allow users to explore and interact with various decentralized services and applications (dApps).

Reading map:

Introduction
What Are Crypto Wallets?
Blockchain Wallet
Crypto Browser or CryptoTab Browser
Forgot your password, now what?
Security
Conclusion

Introduction
The new generation of the Internet, Web 3.0, may still take some time to take its final shape. But the Opera Crypto Browser takes another step in this direction by allowing users to connect their Metamask wallets to the browser.

In addition to one of the main cryptocurrency wallets on the market, Opera - the company behind the browser - will also add other wallets to the operation. According to the developers' own statistics, there are more than 21 million active Metamask addresses.

What Are Crypto Wallets?
Unlike traditional securities that are typically bought, sold and held through a brokerage house, cryptocurrencies allow investors to manage and transfer their assets entirely peer-to-peer. For some, a major attraction of the digital-asset ecosystem is the ability to take custody of assets without the need for intermediaries like banks and brokers. Unfortunately, that means if you lose the seed phrase or private key to the wallet that holds your tokens– equivalent to passwords for online investment accounts–you lose your crypto. There is no email recovery or customer support in the world of self-custodied cryptocurrency wallets.

source: https://wallpaperaccess.com/dark-4k

*Blockchain wallet: *
It's a mechanism that allows you to store cryptocurrencies and make transfers using your computer or cell phone. It is usually a piece of software or hardware that allows a user to store their cryptocurrency, but it can also take other forms such as paper wallets. Just as browsers are for the Internet, allowing a user to access web pages, digital wallets are for cryptocurrencies, allowing cryptocurrency transactions to be made easily, securely and with access to decentralized applications.

Digital wallets have emerged in order to facilitate the use of cryptocurrencies and make their storage more secure. Unlike money in a traditional (fiduciary) bank account, where the account is associated with a user profile with personal information about the holder and an account number, cryptocurrencies don't necessarily need a similar structure to be stored.

Digital wallets work like a screen interacting with the Blockchain. To send bitcoins or any other type of digital currency to a digital wallet, a user is signing the cryptocurrency with a private key to the wallet address. To be able to spend these coins, the private key stored in the user's wallet must match the public address to which the cryptocurrency is assigned, and if this match happens, the cryptocurrency will be assigned to the wallet.

This transaction is recorded on the Blockchain so that it cannot be altered or deleted.

Self-custody digital cryptocurrency wallets, such as those that do not require KYC (Know Your Customer), do not store users' personal information, which ensures a high level of anonymity in transactions. However, this does not mean that transactions are carried out in a hidden way. All transactions are transparent and can be publicly verified using network scanners or blockchain explorers. These explorers work like an open ledger, allowing anyone to consult the operational records on the blockchain, guaranteeing the integrity and traceability of all operations.

Crypto Browser or CryptoTab Browser
is a platform for beginners that allows you to mine cryptocurrencies easily while surfing the internet. It also offers additional features such as Cloud Boost, mining farms, pools and an affiliate program, which can significantly increase your earnings.

Try CryptoTab - the world's first browser with mining features. Earn BTC without having to watch videos, chat or play online games. Join the community of over 35 million users worldwide who already enjoy the CryptoTab Browser.

5 reasons to use CryptoTab Browser
CryptoTab is a flexible solution that gives you all the tools you need to explore and surf the web. It also has a number of unique features that set it apart from the competition.

Mining during web surfing
Exclusive mining algorithms
Easy transition from Chrome
All Chrome extensions
Available on all devices

Forgot your password, now what?
If you can't remember your password, the first step is to identify what type of wallet you're using. Is it a hardware wallet, like Ledger or Trezor? Or is it a software wallet, such as Electrum or Bitcoin Core? The recovery process depends on the type of wallet you have. Find out more about restoring the Bitcoin Core password or restoring the Electrum password.

Next, check to see if you still have your 12- or 24-word seed phrase. If you do, great news! You can restore your wallet on another device using the phrase and create a new password during setup. Once again, the process may vary slightly depending on the wallet you have, for more information, see the sources below.

Security
Digital wallets are no joke when it comes to protecting your data. Here's what guarantees your security:

Biometrics or facial recognition: Only you can authorize payment.
Advanced encryption: Your data is protected from end to end.
NFC technology: Contactless payments.
Tokenization: Your card details are replaced by a unique code with every purchase.

Conclusion
I have a Metamask wallet, and I know how important it is from now on, I know you're thinking, one more password to keep, exactly. Only this time it's a lot of words and not just a number you've chosen, the passwords are chosen by the system and you have to keep them safe in analog mode, what's that? who said paper, that's right, you have to keep them under lock and key on a piece of paper, because if you keep them on your computer and a hacker gets hold of them, you'll lose everything, because you'll have no one to turn to, and of course you already know this if you've read the article or on the internet.

Sources:

International technical standards that seek compliance in blockchain

Humberto Junior — Thu, 09 Oct 2025 17:14:58 +0000

In this article, I will discuss researching international technical standards that seek compliance in Blockchain, which is the topic I will explore in depth in this post. With the growing use of blockchain in various industries, the search for international technical standards that ensure compliance has become an urgent need. These standards seek to guarantee the interoperability, security, and transparency of blockchain-based solutions, creating a more secure and reliable environment for companies, developers, and users. The implementation of these standards is crucial for the adaptation and sustainable growth of this emerging technology, which offers great potential but also presents challenges related to regulation, governance, and data protection.

This is a Postgraduate article that seeks to research and comment on the objective described below. I hope that my post will somehow help someone in the future who is looking for the same thing or something similar.

Objective:
Research an international technical standard that seeks compliance in blockchain. It can be via ENISA, NIST, ISO, or NBR. Comment on some relevant points.

ENISA
ENISA analyzed the technology and identified benefits, challenges, and good security practices. The report identifies that some principles used in traditional systems security and blockchain, such as key management and cryptography, are still largely the same. However, the technology brings new challenges, such as consensus hijacking and smart contract management. In addition, it highlights that public and private ledger implementations will face different sets of challenges.

To protect commercial information while leveraging blockchain technology, financial institutions should seek to adopt best practices that enable them to:

monitor internal activity
automate regulatory compliance
disclose information only to relevant counterparties and authorities
adopt industry-wide governance procedures that will facilitate the updating of ledger implementations over time

NIST

NIST CSWP 9

A taxonomic approach to understanding emerging identity management systems in blockchain

Identity management systems (IDMSs) are widely used to provision user identities while managing authentication, authorization, and data sharing within organizations and on the web. Traditional identity systems typically suffer from single points of failure, lack of interoperability, and privacy concerns, such as enabling mass data collection and user tracking. Blockchain technology has the potential to alleviate these concerns: it can support users' ability to control custody of their own identifiers and credentials, enabling new models of data ownership and governance with built-in control and consent mechanisms. Therefore, blockchain-based IDMSs, which can benefit users and businesses, are beginning to proliferate. This work categorizes these systems into a taxonomy based on differences in blockchain architectures, governance models, and other important characteristics. Context is provided for the taxonomy through the description of related terms, emerging patterns, and use cases, highlighting relevant security and privacy considerations.

**
ISO**

International standards, technical barriers to trade, and WTO principles

To improve the quality of international standards and ensure the effective implementation of the TBT Agreement, the WTO/TBT Committee has developed six principles that clarify and strengthen the concept of international standards under the TBT Agreement and contribute to the advancement of its objectives.

These principles concern:

transparency
openness
impartiality and consensus
relevance and effectiveness
coherence
development dimension

All of the ISOs below comply with the WTO standards mentioned above.

ISO/TC 307
ISO technical committee responsible for developing international standards for blockchain and distributed ledger technologies, including security and governance.

Source: https://www.iso.org/committee/6266604.html

ISO/IEC 22739:2024(en): defines basic terms related to blockchain and distributed ledger technologies to clarify the meaning of terms and concepts used in other documents within the scope of ISO/TC 307 standards; applies to all types of organizations.

Introduction
This document defines terms related to blockchain and distributed ledger technologies (DLTs) to clarify the meaning of terms and concepts used in other documents within the scope of ISO/TC 307.

Clear, consistent, and coherent standards require clear, consistent, and coherent terminology. This document follows the rules and guidelines established by ISO/TC 37, Language and Terminology, for terminology standards.

This document applies to all types of organizations (e.g., commercial companies, government agencies, and non-profit organizations). The target audience includes, among others, academics, solution architects, customers, users, tool developers, regulators, auditors, and standards development organizations.

Source: https://www.iso.org/obp/ui/en/#iso:std:iso:22739:ed-2:v1:en

ISO/TR 23244:2020(en)
Technical report with an overview of privacy and the protection of personally identifiable information applied to blockchain systems and distributed ledger technologies (DLT)

Introduction
This document provides an overview of practical issues and concerns related to privacy and the protection of personally identifiable information (PII) in the context of blockchain and distributed ledger technologies (DLT) and their applications.

Privacy and PII protection issues are widely considered to be a major barrier to the adoption of DLT-based solutions. This document identifies and assesses known privacy-related risks and ways to mitigate them, as well as the potential for improving the privacy of blockchain and distributed ledger technology.

Source: https://www.iso.org/obp/ui/#iso:std:iso🇹🇷23244:ed-1:v1:en

ISO/TR 23455:2019(en)
Technical report providing an overview of smart contracts in blockchain and DLT systems, describing what these contracts are and how they work.

Source: https://www.iso.org/obp/ui/en/#iso:std:iso🇹🇷23455:ed-1:v1:en

ISO/TS 23635:2022(en)
Technical specification with guiding principles and framework for the governance of blockchain and DLT systems, and guidelines for compliance with this governance, including regulatory and risk contexts that support the efficient, effective, and acceptable use of DLT systems.

Source: https://www.iso.org/obp/ui/en/#iso:std:iso:ts:23635:ed-1:v1:en

ISO/TR 23576:2020(en)
Technical report discussing threats, risks, and controls related to systems that provide digital asset custody and/or exchange services to their customers.

Introduction
A digital asset custodian keeps clients' digital assets safe in order to minimize the risk of theft or loss. This document illustrates the risks, threats, and security measures that digital asset custodians consider, design, and implement to protect their clients' assets, based on best practices, existing standards, and research. For example, the management of signature keys for digital assets requires special attention, taking into account the specific nature of blockchain and DLT systems and the security challenges they face. An important topic discussed is the proper management of signature keys by digital asset custodians in order to prevent misuse and transactions by unauthorized persons.

Source: https://www.iso.org/obp/ui/#iso:std:iso🇹🇷23576:ed-1:v1:en

This government PDF explains ISOs and their standards in each field defined by ISOs, and is very similar to those described above, but it is good to read from various sources on the subject. I will post a brief comment on the PDF.

Conclusions
Blockchain and related technologies have the potential to revolutionize various industries by offering security, transparency, and process efficiency, especially in those that generate digital products with short expiration dates, such as airline, train, and bus tickets, event tickets, and others of this nature. However, cybersecurity risks and the complexity associated with blockchain systems require a careful regulatory approach to ensure system integrity and data protection, while preventing, in the case of cryptocurrencies, the use of these digital assets for money laundering or enabling the operation of criminal groups. The creation of robust standards and regulations is essential to maximize the benefits of blockchain and other DLT systems, maintaining user confidence and mitigating potential vulnerabilities.

Source: https://www.gov.br/gsi/pt-br/seguranca-da-informacao-e-cibernetica/osic/osic-15-24.pdf

NBR
The ABNT NBR ISO 22739:2024 standard - Blockchain and distributed ledger technologies - Vocabulary, developed by the Brazilian Committee on Information Technology and Digital Transformation (ABNT/CB-021), has been published. To participate in the Study Committees, send an email to: carolina.martins@abnt.org.brSiga or visit the LinkedIn page of (ABNT/CB-021), and learn more: https://lnkd.in/e4K9ePnj

I looked for information on standards, norms, and compliance in NBR in relation to blockchain, but I ran into the problem of having to pay to read it, so it would not be right to include any of that information here, even partially. If that is not a problem for you reading this post now, just click on the link above and follow the flow, where you will find the standard mentioned and purchase it.

Conclusion
The adoption of international technical standards that promote compliance in blockchain is fundamental to the consolidation of this technology in the global market. These standards not only increase the confidence of users and companies, but also allow different systems and networks to communicate effectively and securely. As blockchain continues to evolve, the creation and continuous improvement of these standards will be essential to ensure the integrity, privacy, and scalability of solutions, providing a more secure and harmonious future for all involved.

Sources:

About Bitcoin

Humberto Junior — Mon, 06 Oct 2025 15:42:45 +0000

In this article I'm going to talk about Bitcoin and its emergence and its ecosystem, what it is, and the mystery of who created it or what group created it, and what it's used for in the real world, and its history to date, I know there are a lot of “why's” but I'm going to talk very quickly and answer every question in this post, and if you want to delve deeper into the subject, just click on the sources at the end of the post.

Article map

- Presentation on the subject: About Bitcoin
- When Bitcoin was created
- What is Bitcoin?
- What are the advantages of Bitcoin?
- How to buy and sell bitcoins
- Is Bitcoin safe?
- Mining
- Conclusion

When Bitcoin appeared
Bitcoin appeared on October 31, 2008. On that day, the creator (or creators) of the cryptocurrency, who hides under the pseudonym Satoshi Nakamoto, sent an email to a list of people interested in cryptography. In the body of the message, he wrote that he had been working on “a new electronic money system that is totally peer-to-peer, with no trusted third parties”.

What Is Bitcoin?
Bitcoin is a decentralized digital payment system and currency. It was created by a person or group, going by the username Satoshi Nakamoto, who posted a whitepaper on a discussion board.

The world's first widely adopted cryptocurrency. With bitcoin, you can send digital money over the internet safely and directly. It is a decentralized digital currency used for encrypted peer-to-peer (P2P) transactions, without the need for a central bank.

Bitcoin operates without a financial system or government authorities and doesn't require the involvement of financial institutions. It can be used as an alternative to fiat currencies or as an investment bought through crypto exchanges. It utilizes peer-to-peer transfers on a digital network that records and secures all transactions. This network uses a blockchain, an open-source program that chains transaction histories to prevent manipulation.

What are the advantages of Bitcoin?
Bitcoin has many properties and uses, but we're going to look at a very specific one: bitcoin as a currency. But what are the advantages of bitcoin as a currency? There are many! Let's highlight the main ones: freedom of payment, lower fees, security, privacy, control and transparency.

No Bitcoin can be confiscated, you can send it to whoever you want by paying lower fees. In addition, it is secure and provides more privacy, control and transparency in negotiations. However, Bitcoin can also be used as an investment for those who are looking to diversify their assets for better gains. Bitcoin has brought excellent returns and the trend is for it to become more popular in the long term.

How to buy and sell bitcoins
There are currently three ways to acquire bitcoins efficiently: by mining, buying on exchanges or buying directly from other people.

Mining
You can acquire Bitcoins by mining. You will need to buy a computer specifically for this purpose and give your computing power to the network by confirming transactions.

Foxbit
You can buy bitcoins through exchanges like Foxbit. Exchanges are websites that bring together buyers and sellers in a secure environment, where exchanges take place anonymously and quickly.

P2P
It is also possible to buy Bitcoins directly from other people, without having to go through an exchange. The problem is that you'll need to find someone you trust and who knows bitcoin, because scams in this type of transaction are common.

Is Bitcoin safe?
A very common question is about the security of Bitcoin. Is it safe to have bitcoin? The answer is simple and was given in the video above by experts on the subject: bitcoin is safer than the money you have in your bank today. If you know bitcoin, you'll know the level of security it provides is far superior to that of traditional banks. In Bitcoin there is not a single point of failure, for a malicious actor to be able to attack the network it would be necessary to hack into millions of computers around the world, an impossible task. Whereas in traditional banking systems there are only a few central servers and all transactions are hidden from the public.

Mining
For the system to work properly and securely on the blockchain, powerful calculations are needed to maintain the codes and cryptography. And those who solve these calculations are called miners. Several people participate in the mining network, and whoever manages to solve the mathematical challenge first receives bitcoins as a reward.

https://wallpaperaccess.com

Conclusion
It's a lot of information to assimilate for those who aren't familiar with the subject, this article covered the most common terms and read on the internet, in the sources there is a vast amount of support material and of course the great network, I'm here to acquire more knowledge and this article for me, serves as a trigger to read and study more, knowledge doesn't take up space and makes us less ignorant.

I am studying hard every day to become a good Blockchain Developer. Please follow me on my professional social networks:

Sources:
https://bitcoin.org/bitcoin.pdf
https://www.infomoney.com.br/guias/o-que-e-bitcoin
https://en.wikipedia.org/wiki/Bitcoin
https://www.youtube.com/watch?v=-1ErJsH73Lk
https://www.bbc.co.uk/bitesize/articles/zfsvy9q
https://www.investopedia.com/news/how-bitcoin-works
https://foxbit.com.br/o-que-e-bitcoin
https://blog.nubank.com.br/o-que-e-bitcoin

How does Blockchain work?

Humberto Junior — Fri, 26 Sep 2025 13:22:13 +0000

This article I'm going to cover Blockchain, I'm going to go into as much detail as possible about how this technology works in the real world, and more important details. Due to my reading of the sources at the end of this post, I realized that I won't be able to go into as much detail as I wanted, blockchain is a very extensive and complex subject, I'll have to explain each subject on the map in other posts, in short I'll have to dissect this post into several. I'm not going to talk about its history because there's already a previous post, but I feel that my time has come to deepen my knowledge of this world of "blockchain".

Reading map:

How does Blockchain work?;
What are the advantages of using blockchain?
Blockchain's Main Characteristics
Find out about 5 applications of blockchain in companies
What are the types of blockchain networks?
Conclusion

How does Blockchain work?
A blockchain is “a distributed database that maintains a continuously growing list of ordered records, called blocks.” These blocks “are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. A blockchain is a decentralized, distributed and public digital ledger that is used to record transactions across many computers so that the record cannot be altered retroactively without the alteration of all subsequent blocks and the consensus of the network.

What are the advantages of using blockchain?
The main advantage of using blockchain is the security that this system provides for transactions, since the registration and storage of data is encrypted in a block inserted into the network.

In addition, because it is decentralized, the information stored in these blocks is more secure from hacker attacks, as there is not just one point of failure that can be exploited by criminals, which also guarantees privacy.

Other advantages of blockchain are transparency and open access.

Creating Transactions: A blockchain transaction shows the movement of physical or digital assets from one party to another on the blockchain network. It is recorded as a block of data that includes details such as these:

Who was involved in the transaction?
What happened during the transaction?
When did the transaction take place?
Where did the transaction take place?
Why did the transaction take place?
How much of the asset was exchanged?
How many preconditions were met during the transaction?

Verification and Validation: There are three ways in which validation takes place within a blockchain network. Note that in all of them the word “proof” appears: this is because everyone, each in their own way, needs to prove something for validation to take place.

Proof of Work ou PoW
Proof of Stake ou PoS
Proof of Authority ou PoA

Block formation: A validator is a participant in a blockchain network who has the task of verifying new blocks of transactions and adding them to the chain, with the incentive to perform this task being the earning of rewards in cryptocurrencies.

Consensus and Chain Addition: A consensus mechanism is the programming and process used in blockchain systems to reach a distributed agreement on the state of the ledger or a set of data. Cryptocurrencies, blockchains and distributed ledgers benefit from their use because consensus mechanisms replace much slower and sometimes inaccurate or unreliable human verifiers and auditors.

Immutability and Security: they are secure because they are designed to be transparent and immutable through consensus mechanisms and cryptographic keys. However, blockchain networks and blockchain members, including nodes, are vulnerable to certain types of cyber attacks.

Blockchain's Main Characteristics

Decentralization
Transparency and Security
Immutability and Trust

Find out about 5 applications of blockchain in companies

There are more applications, but I'm only going to comment on these five, otherwise the post will be too long to read.

Transition validation
Smart contracts
Payment system
Cloud storage
Supply Chain

What are the types of blockchain networks?
There are four main types of decentralized or distributed networks on the blockchain:

Public blockchain networks
Public blockchain networks do not require permission and allow everyone to participate. All blockchain members have equal rights to read, edit and validate the blockchain. People use public blockchains to exchange and mine cryptocurrencies such as Bitcoin, Ethereum and Litecoin.

Private blockchain networks
A single organization controls private blockchains, also called managed blockchains. The authority determines who can be a member and what rights those members will have on the network. Private blockchains are only partially decentralized, as they have access restrictions. Ripple, a digital currency exchange network for businesses, is an example of a private blockchain.

Hybrid blockchain networks
Hybrid blockchain networks combine elements of public and private networks. Companies can set up a private, permission-based system alongside a public one. In this way, they control access to specific data stored on the blockchain, while keeping the rest of the data public. They use smart contracts to allow members of the public to verify that private transactions have been completed. For example, hybrid blockchains can grant public access to digital currencies, while bank-owned currencies are kept private.

Consortium blockchain networks
A group of organizers control the consortium blockchain networks. Pre-selected organizations share responsibility for maintaining the blockchain and determining data access rights. Sectors in which organizations have common goals and which benefit from shared responsibility usually prefer consortium blockchain networks. For example, the Global Shipping Business Network Consortium is a non-profit blockchain consortium that aims to digitize the shipping industry and increase collaboration between shipping industry operators.

Conclusion
Blockchain can no longer be treated as a trend, but as a new reality of a technology that was the milestone for the evolution of the web, which is now known as Web 3.0. In it we have decentralization, where it takes control away from the big techs and passes it on to the users, security because it is impossible to change a block, without changing the previous ones and with that it is immutable that there is no way to change and therefore it becomes very safe. Web 3.0 is the path to a safer and more reliable internet, which is why I'm riding this wave every day.

Sources:
https://www.blackduck.com/glossary/what-is-blockchain.html
https://www.acolabam.com.br/blog/como-usar-blockchain
https://pt.wikipedia.org/wiki/Blockchain
https://en.wikipedia.org/wiki/Blockchain
https://aws.amazon.com/what-is/blockchain/?nc1=h_ls
https://blog.bitso.com/pt-br/tecnologia/o-que-validacao-blockchain
https://www.acolabam.com.br/blog/como-usar-blockchain
https://www.investopedia.com/terms/c/consensus-mechanism-cryptocurrency.asp

Image source: https://wallpaperaccess.com

About Blockchain

Humberto Junior — Thu, 25 Sep 2025 13:02:08 +0000

In this article I'm going to talk a lot about this technology, who is behind web 3.0 and its main foundations, this technology is the most important of the foundations for this new phase of the internet, I'm going to talk both to laypeople and to those who have been riding this wave for some time, I've read about it sporadically, but until recently it was relevant to me, but now it has become more important and I have to ride this wave, I feel that my moment has come.

I am going to summarize Blockchain, so anyone who reads it will understand what it is, what it is for, and where it applies in the real world, but even so, if you want to read more details and delve deeper into the subject, just click on the links to sources at the end of the article, there is much more extensive information there.

What is Blockchain?
Blockchain technology is an advanced database mechanism that enables the transparent sharing of information on a company's network. A blockchain database stores data in interconnected blocks in a chain. The data is chronologically consistent because it is not possible to delete or modify the chain without the consensus of the network. As a result, you can use blockchain technology to create an unalterable or immutable ledger to monitor orders, payments, accounts and other transactions. The system has built-in mechanisms that prevent unauthorized transaction entries and create consistency in the shared view of these transactions.

What is it for?
Allows all transactions to be recorded in a public or private system, where all participants have access to the data. This significantly reduces the risk of fraud and facilitates audits, since the records are immutable and accessible in real time.

Where can blockchain be used?
Originally known for being the basis of Bitcoin, blockchain is a decentralized system that guarantees the security and transparency of digital transactions, without the need for intermediaries. Its application goes far beyond the financial world, covering areas such as health, logistics, governance and much more

What is the main purpose of blockchain technology?
Blockchain technology is an advanced database mechanism that allows information to be shared transparently across a company's network.

What is blockchain, for example?
Blockchain is a shared, immutable ledger that facilitates the process of recording transactions and tracking assets in a business network. An asset can be tangible (a house, car, money, land) or intangible (intellectual property, patents, copyright, brand).

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How to use blockchain on mobile?**

Blockchain on Mobile

Access your Blockchain Wallet on the go.
Scan a friend's QR code to send and receive bitcoin seamlessly.
Use your touch with the wallet ID to log in to your wallet.

What is a blockchain wallet?

Definition: A blockchain wallet is a digital wallet that users can use to store and manage Bitcoin, Ether, and other cryptocurrencies. A blockchain wallet allows cryptocurrencies and other digital assets to be transferred and converted back into the user's local currency.

Can a blockchain be hacked?

The concepts behind blockchain technology make it nearly impossible to hack into a blockchain. However, weaknesses outside of the blockchain create opportunities for thieves. Hackers can gain access to cryptocurrency owners' cryptocurrency wallets, exchange accounts, or the exchanges themselves.

My Linkedin: https://www.linkedin.com/in/humbertoromanojr

Sources:

https://en.wikipedia.org/wiki/Blockchain
https://aws.amazon.com/what-is/blockchain/?nc1=h_ls
https://www.blockchain.com

Source image: https://wallpaperaccess.com

About Web 3.0

Humberto Junior — Wed, 24 Sep 2025 21:03:05 +0000

In this post I'm starting my daily learning about Web 3.0 and its aspects, but at least posting two articles a week and studying the technology from the beginning to the present day, and documenting it here or on other platforms, is a good idea to leverage my continuous learning on the subject.

In this first paragraph, I'm going to summarize the story of how we got to Web 3.0. If you want to know more details, just click on the sources link below, as there is the full story, I'm not going to copy a huge text for a subject that is well covered on the Internet. It all started in the 1990s with Web 1.0, the first phase of the internet with only text and images where people could only read, and after a decade came Web 2.0, the second phase, where we can interact, for example, with the big platforms like Google and Facebook, where people can create accounts, where people can read and write etc. And since 2014, when the term Web 3.0 was formalized, the third phase has begun and we are learning this new wave.

What is Web 3.0?
Decentralization: One of the fundamental pillars of Web3 is decentralization. Unlike the traditional internet, where data is stored on servers controlled by specific entities, in Web3, information will be distributed across a network of interconnected nodes. This would eliminate single points of failure and reduce vulnerability to cyber attacks, providing a more resilient internet.

User autonomy: Web3 aims to give users greater control over their own data. Thanks to blockchain technology and smart contracts, it will be possible to guarantee the authenticity and integrity of information, allowing owners to share data selectively and securely. This aims to create a more reliable and transparent environment for online interactions.

Interoperability: Another important aspect of Web3 is interoperability between different platforms and applications. This means that systems can communicate and collaborate harmoniously, facilitating the creation of more dynamic and integrated digital ecosystems. This feature opens up new opportunities for innovation and project collaboration in various sectors of society.

Sources:

https://en.wikipedia.org/wiki/Web3
https://www.avato.com.br/post/web3-entenda-o-que-pode-ser-a-proxima-revolucao-da-internet
https://www.youtube.com/watch?v=WEsO8OuAnjE
https://www.youtube.com/watch?v=2uYuWiICCM0 <== it's well explained, incredible

People Counter

Humberto Junior — Mon, 05 Apr 2021 01:52:17 +0000

Good morning, good afternoon or good night Dev

My first project in Flutter, i come with this article to start my series of Flutter, a course that I took a while and now I will dedicate myself to the weekends to do it. This simple project made it possible to learn many things about the Widget.

The widgets most used in this project were:

Text
FlatButton(is depreciated)
Column, Row
Image.assets
Padding
Stack(Widget overlay)
Stateful, Stateless

The most important thing about this first app I found was knowing how to work with the difference between Stateful and Stateless, but as I already work with React Native I know the difference theory, but I didn't know how to work with Flutter.

Stateful => It is used to work with widgets the state in the application, and so we can see changes in the screen of certain components, as it has in this project, when we click on the +1 or -1 buttons it changes the state of how many people can enter the restaurant.

Stateless => Serves to work with widgets more visusias that do not change anything visually, as the name says, "stateless" what do you mean stateless.

link video: https://youtu.be/iJ0EbieiZOQ