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What is Blockchain technology? Everything you need to know

If you’ve been following banking, investing, or cryptocurrency for the past ten years, you may know “blockchain,” the record-keeping technology behind the bitcoin network. And there’s a great opportunity it’ll make a lot of sense. When struggling to understand more about Blockchain technology, you possibly encountered a description like: “Blockchain distributed, decentralized, public account.”

The great news is that Blockchain Technology is more straightforward to understand than that definition.


copy of the blockchain blockchain network block network bitcoin


What is Blockchain Technology?

If this technology is so sophisticated, why is it called blockchain technology? At its most basic level, Blockchain means a series of blocks, but not in the traditional meanings of those terms. While we say the words “block” and “chain” in this situation, we are discussing digital information (“block”) collected in a public database (“chain”).

The “block” in the Blockchain is produced up of informational information. In particular, they have three sections.

  • Blocks store information about transactions such as your most recent purchase date, time, and dollar amount from Amazon. (Note: This Amazon example is, for example, shopping; Amazon Retail does not work on the blockchain theory as of this writing)
  • Blocks store information about people who engage in transactions. One block you can buy from Amazon is your name on “, Inc. (AMZN). As An Alternative to using your real name, your purchase will be recorded without identifying information using a unique “digital signature,” such as a username.
  • Block store information that separates them from other blocks. Many people like you and me have names to separate us from each other; each block stores a unique code called “hash,” which allows it to be separated from each additional block. Hashing is a cryptographic code generated by specialized algorithms. Let us know you made a great purchase on Amazon, but you decide not to block it and need each other when it is in transition. Although your new transaction details are the same as your pre-purchase, we can still tell them due to the unique code of the blocks.

While the block in the case above is used to store single purchases from Amazon, the reality is slightly different. In the Bitcoin blockchain, a single block can actually store 1MB of data. Depending on the size of the payment or transaction, this means that a single block can handle a few thousand transactions under one roof.

How Blockchain Technology Works?

When a block stores new data, it is included in the Blockchain. Blockchain, as its name implies, can consist of multiple blocks at once. To add a block to a blockchain, however, there must be four things:

There must be a transaction. Keep up with your impulsive Amazon buying example. After a quick click-through, several checkouts prompts, you go against your right decision and buy. As we discussed above, in many cases, a block can make thousands of transactions at once, so your Amazon purchase is packed in blocks, along with other customer transaction information.

That transaction must be done; After purchase, your transaction should be verified along with other public records, such as the Securities Exchange Commission, Bitcoin, or anyone responsible for making data entry to your local library. With Blockchain, that work is left to a network of computer systems. When you make your purchase from Amazon, the network of computers goes to check whether your transaction has been done, as you said. They verify the purchase details at the time of the business transaction, including the dollar amount and the participants. (Find out more about how it’s done in a second)

That transaction must be stored in the block. Once your purchase has been validated, it will get a green light. The total volume of the trade, your digital signature, and Amazon’s digital signature are all stored in one block. There, the transaction can reach hundreds or even thousands.

The block must be hash. Unlike angel wings, after the block’s transactions are verified, a specific, identifying code called a hash must be specified. The block is also given the hash of the most recent block added to the Blockchain. Once conscious, blocks can be included in the Blockchain.

When that additional block is added to the Blockchain, it will be publicly offered for everyone to see – and you. If you examine Bitcoin’s Blockchain, you’ll see that you have access to transaction data, when (“time”), where (“height”), and by whom (“by relay”). You are blocked in with information added to the Blockchain.

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Is Blockchain Technology Private?

Anyone can view the Blockchain content, but users can choose to connect their computers as nodes on the blockchain network. In doing so, their computer receives a version of the Blockchain, which is automatically updated whenever a new block is added, like a Facebook newsfeed, when it is posted to the new status. Gives updates.

Each computer on the blockchain network has its private copy of the Blockchain, which means in the case of tens of thousands of bitcoins, there are millions of prints of the same Blockchain. Although each copy of the Blockchain is identical, information on a computer network makes it more difficult to convert data. With Blockchain, there is no single, complete account of manipulated events. Instead, the hacker must replace each copy of the Blockchain on the system. Blockchain is a “distributed” ledger.

However, if you look at the Bitcoin blockchain, you will see that you do not have access to the users’ information that does the transactions. Even Though transactions on the Blockchain are not anonymous, personal information about users is restricted to their digital signature or username.

This raises an important question: How can you manage a blockchain or a network of computers if you don’t know who adds blocks to the Blockchain?

Is Blockchain Technology Safe?

Blockchain technology is, in many ways, responsible for security and reliability issues. First, new blocks are always stored in a timely and straightforward manner. That is, they still add to the “end” of the Blockchain. If you look at bitcoin’s Blockchain, you’ll see that every block has a chain called “height.” By January 2020, the height of the block had risen to 615,400.

Once a block is added to the Blockchain’s completion, it is very problematic to go back and change over the subjects of the block. This is because each block has its own hash along with the “hash: of the block. Hash codes are generated by a mathematical function that converts digital data into numbers and letters. If that information is modified in any way, the hash code will also be changed.

Why safety is important here, suppose a hacker tries to modify your transaction from Amazon so that you pay twice for your purchase. Edit and block your transaction dollar amount as soon as they change the hash. The next block in the series is still an old hash, and the hacker needs to update that block to cover its tracks. However, doing so will change the “hash” of the block. And after, and so on.

To change a block, a hacker has to change every block in the Blockchain. Remembering all those hashes takes tremendous and impossible computing power. In other words, once a block is added to the Blockchain, it is complicated to edit and impossible to remove.

To address the trust problem, Blockchain has run tests for computers that want to join the network chain and add blocks. Trials, known as “consensus models,” require users to “prove” themselves before participating in the blockchain network. One of the most frequent examples of using bitcoin is called “proof of work.”

As verification of the work system, computers must “work” by solving the complex computational mathematical problem they “worked for.” If the computer solves any of these problems, they are entitled to add blocks to the Blockchain. The procedure of adding up blocks to the Blockchain that the “cryptocurrency” world calls out “mining” is not easy. In fact, the chances of resolving one of these challenges on the Bitcoin network were one in 15.5 trillion in January 2020. To solve complex mathematical problems over those limitations, computers must run programs that cost them considerable power and energy (read:) money.

Evidence of the work does not make hackers’ attacks impossible, but it does make it somewhat useless. If they want to coordinate an attack on the Blockchain, they have to control an extra 50% of the total computing power on the Blockchain so that all the network participants can be exhausted. Given the bitcoin blockchain’s large size, the so-called 51% attack is certainly not worth the effort and is more than impossible. (More about this below)

Blockchain Technology vs. Bitcoin

Blockchain’s goal is to allow digital information to be recorded and distributed but not modified. The concept looks at technology; our heads can change, so let’s look at the Blockchain that is the first application of technology.

The blockchain method was first introduced in 1991 by Stuart Haber and W.W. Created by Scott StoreNeta; two researchers wanted to implement a system that could damage document timestamps. Approximately two years later, with Bitcoin’s introduction in January 2009, Blockchain was the first real-world application.

The bitcoin set of rules is developed on the Blockchain. In a research paper guided by digital currency, Satoshi Nakamoto, creator of Bitcoin’s nickname, called it “a completely new electronic cash system with no trusted third-party peer-to-peer.”

Here’s how it works

You have all these people who have bitcoin. There are millions of people around the world who are at least part of Bitcoin. Explain that one of those millions would like to spend their bitcoins on groceries. Where does Blockchain come from?

When it comes to printed money, the use of printed currency is regulated and certified by a central authority, usually a bank or a government – but no one is controlled by bitcoin. Instead, transactions made in bitcoin are accredited by a network of computers. It means “decentralized” through the Bitcoin network and Blockchain.

When a person pays for things using bitcoin, the computers in the bitcoin network sprint to validate the transaction, to do this, users run an application/software/program on their computer and try to resolve a complicated math problem called “hash.” When a computer solves a problem with “hashing” blocks, its algorithmic work must also verify the block’s transaction. As we have explained above, the entire operation is publicly recorded and stored on the Blockchain as a block, at which point it cannot be returned. In bitcoin and other blockchains, computers that successfully authenticate blocks are rewarded for their work with cryptocurrencies. This is commonly known as “mining.”

Although the transaction is publicly recorded on the Blockchain, user data is at least incomplete. To perform operations on the Bitcoin network, contributors must run a program called “wallet.” Each wallet has two distinct and distinct cryptographic keys: the public key and the private key. The public key is the place to deposit and withdraw the transaction. This is the key that shows the user’s digital signature in the blockchain record.

If a user receives payment in bitcoin for their public key, they cannot withdraw them with private equivalents. The user’s public key is a truncated version of their private key created by a sophisticated mathematical algorithm. However, because of this equation’s density, it is almost impossible to change the process and create a private key from a public key. For this reason, blockchain technology is considered confidential.

Public and Private Key Basics

Here’s the ELI5 – “I’ll explain like 5” – immersion. You can suppose a public key as a college locker and a private key as a locker combination. Teachers, students, and at the same time, your love can add letters and notes by opening your locker. However, the only person who can retrieve the contents of the mailbox has a unique key. However, it should be observed that when the school locker combination is placed in the principal’s office, there is no central database that tracks the private keys of the blockchain network. If a user misuses their private key, they lose access to their bitcoin wallet, made to the national headlines in December 2017.

A single public chain

On the Bitcoin network, Blockchain is shared and managed by users’ public systems – but accepted. When users connect with s network, their connected computer collects a copy of the Blockchain, which is updated when a new transaction block is added. What if, by human error or hacker efforts, a user copy of the Blockchain can be separated from every other copy of the Blockchain?

Blockchain protocol discourages the presence of several blockchains over a process called “consensus.” In the presence of many, many different copies of the Blockchain, the consensus protocol adopts the longest chain available. Most users on the Blockchain can quickly add a block at the end of the string. By that logic, the Blockchain of records always relies on many users. The compromise protocol is one of the greatest strengths of blockchain technology and one of its most significant flaws.

Theoretically, hacker-proof

Theoretically, a hacker can take advantage of the majority rule, which indicates that 51% is an attack. Here’s how it goes. Explain that there are five million computers in the Bitcoin network, a gross understatement, but a sufficient number of dividing. To get most of the computer network, a hacker must monitor at least 2.5 million and one of those computers. In doing so, a cyber attacker or faction of attackers may interfere in the process of documenting new transactions. They can send out a purchase – and then reverse it so that the coin they have spent on is still in their possession. This risk, known as double-expense, is equivalent to ideal counterfeiting and enables users to spend twice as much on their bitcoins.

Bitcoin-scale Blockchain is challenging to execute because it requires an attacker to gain control over millions of computers. When bitcoin was first established in 2009 and had dozens of users, it was easy for an attacker to manage much of the network’s computational power. This defining feature of Blockchain is described as a weakness for runaway cryptocurrencies.

51% of users’ fears of attacks can limit monopolies by building a blockchain. In “Digital Gold: Bitcoin and the Inside Story of the Missions and Millionaires Reinventing Money to Money,” New York Times journalist Nathaniel Popper writes about how a group of users called “Bitfury” can power thousands of high-end computers. Competitive edge over the Blockchain. Their goal is to mine as many blocks as possible and earn bitcoins, which are worth about $ 700.

Using Bitfury

However, as of March 2014, bitcoin employs more than 50% of the blockchain network’s total computing power. Instead of maintaining their grip on the network, the group chose to self-regulate and vowed not to go above 40%. Bitfury knows that Bitcoin’s worth will fall because consumers sell their coins for a 51% attack probability if they choose to maintain control over the network. In other words, if clients lose trust in the blockchain network, the risk information for that network becomes completely useless. Blockchain users only increase their computing power one step before losing money.

Practical application of Blockchain

Blockchain stores data about monetary transactions – we have found a way out. Blockchain has actually proved to be a very reliable way to store data about other types of transactions. In fact, blockchain technology can be applied to store assets, exchange data, store data in a supply chain, and vote on votes for a candidate.

Professional Services Network Deloitte recently surveyed over 1,000 companies in seven countries and explained how to integrate Blockchain into their business functions. In their survey, 34% said they already have a blockchain system in place, while another 41% expect a blockchain application to run in the next 12 calendar month. Besides, 40% of companies surveyed reported that they would invest 5 million or much more in the future Blockchain. Today some of the widespread applications of Blockchain are being discovered.

Bank consumption

No industry stands to profit by incorporating Blockchain into its business activities rather than banking. Financial institutions operate only five business days. That means if you try to deposit a check at 6 pm on a Friday, you have to wait until Monday morning to see if the money has hit your account. Even if you pay your deposits during business hours, the verification takes one to three days due to the large transactions that the banks have to settle. On the other hand, Blockchain never sleeps.

By incorporating Blockchain into banks, users can process their transactions in under 10 minutes, basically adding blocks to the Blockchain takes time, week, or day. With Blockchain, banks have the opportunity to quickly and securely transfer funds between companies. For example, in the stock trading business, the agreement and clearance process could take up to three days (or more, if the banks do business internationally), meaning that money and shares will be frozen by that time.

Differing on the sum of money involved, transit money can cause high costs and risks to banks for a few days. Santander, the European bank, has a reserve of $ 20 billion a year. French consultancy Capgemini estimates that customers can save up to $ 16 billion in banking and insurance fees each year via blockchain-based applications.

Use in cryptocurrency

Blockchain is the basis for “cryptocurrencies” such as bitcoin. As we have previously explored, currencies such as the U.S. dollar are regulated and validated by a central authority, usually a bank or government. In the Central Authority system, the user’s data and the currency are technically owned by their bank or government. If the consumer bank collapses or lives in a country with an unstable government, its currency value may be at risk. Bitcoin’s birth concerns are these.

By expanding its operations over the network of computers, Blockchain lets bitcoin and other cryptocurrencies manage without a central authority requirement. This not only decreases risk but also removes many processing and transaction fees. It is a more stable currency and has a broader network of countries and applications in states that have volatile currencies domestically and internationally (at least, this is the goal)

Health care uses

Health care resources can use Blockchain to store their patients’ medical records actively. When a medical record is produced and signed, it is written on the Blockchain, giving patients the confidence and trust that the file cannot be changed. These private health records can be encoded and kept on the Blockchain with private keys, making them accessible to only a few individuals, leading to confidentiality.

Use property records

If you’ve ever spent time at your local recorder’s office, you know that filing a property claim can be burdensome and ineffective. Today, physical labor must be delivered to a public servant in the local recording office, manually recorded in the county’s central database and general index. In the case of a property dispute, property claims should be coordinated with the public index.

This process is not only costly and time-consuming – it is also associated with human error, where tracking every impurity makes property ownership less efficient. Blockchain has the ability to scan documents and eliminate the need to track physical files at the local recording office. If property ownership is stored and verified on the Blockchain, the owners can trust that their work is proper and permanent.

Get used to smart contracts.

A smart contract is a computer code created on the Blockchain to facilitate, validate, or negotiate the deal. Intelligent contracts operate under conditions where users agree. When those conditions are met, the terms of the agreement are automatically fulfilled.

For example, I rent my apartment to you using smart contracts. As soon as you pay me your bail amount, I agree to give you the apartment door code. We both send our portion of the agreement to Smart Contract, which automatically holds my door code for your security deposit on the lease date. If I do not supply the Door Code by the time of the lease, the smart contract will refund your security deposit. This eliminates the fees typically used by a notary or third-party arbitrator.

Supply chain utilization

Suppliers can use Blockchain to record the source of the goods they have purchased. This allows companies to verify the accuracy of their products, as well as health and morals labels such as “organic,” “local,” and “fair trade.”

As Forbes reported, the food industry is fast-tracking food and security on the agro-consumer journey using Blockchain.

Use in voting

As confirmed in the November 2018 midterm elections in West Virginia, voting with Blockchain is likely to eliminate electoral fraud and increase voters’ number. Each vote is stored on the Blockchain as a block, making it nearly impossible to change them. The blockchain protocol protects the transparency of the election process, reduces the staff required to conduct the elections, and provides immediate results to the authorities.

Advantages and disadvantages of Blockchain Technology

For all its complexities, blockchain capability in the form of decentralized record-keeping is virtually unlimited. From greater user privacy and increased security to lower processing fees and fewer errors, blockchain technology can be better seen from the above apps.


  1. Good accuracy by eliminating human participation in the verification
  2. Reducing cost by ending third party verification
  3. Decentralization makes it difficult to disrupt
  4. Transactions are secure, private, and effective.
  5. Transparent technology


  1. Significant technical costs associated with mining bitcoins
  2. Fewer transactions per second
  3. History is used in illegal activities.
  4. The opportunity to hack

Blockchain selling points for businesses in the market today are more detailed.

Chain accuracy

Transactions on a blockchain network are accepted over a network of millions of computers. This eliminates almost all human involvement in the verification process, resulting in less human error and a more accurate record of information. Even if a computer’s computation on the network is flawed, only one copy of the Blockchain will be error-prone. If that error were to spread to the remaining Blockchain, it would have to be built by at least 51% of the network’s computers – near impossible.

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Price reduction

Usually, customers pay the bank to verify the transaction, sign a document, and marry a notary or minister. Blockchain removes the need for third-party authentication and, with that, their associated costs. Business owners must pay a small fee whenever they accept a credit card payment, as banks must process those transactions. On the other hand, bitcoin has no central authority and virtually no transaction fees.


The Blockchain never stores any of its info in a central location. Instead, the Blockchain is duplicated and spread over a network of computers. Every time a new block is inserted to the Blockchain, each computer on the network modernizes its Blockchain to indicate the change. It will make it more difficult to disrupt the Blockchain and disseminate that information over the system, rather than storing it in a central database. If a copy of the Blockchain falls into the hands of a hacker, only one copy of the information will be compromised instead of the entire network.

Effective transaction

Transactions dealt with by a central authority may take several days to resolve. If you try to deposit a check on Friday evening, for example, you won’t see the money in your account until Monday morning. Financial institutions operate on business hours, five days a week, Blockchain 24 hours a day, seven days a week. The transaction can be completed in about ten minutes and can be considered safe after a few hours. This is particularly useful for cross-border trading, which usually takes longer due to time-zone issues and requires all parties to verify payment processing.

Private transaction

Most blockchain networks act as public databases, which means that anybody with an Internet connection can look at the network’s transaction history list. Although users may receive details about transactions, they may not identify information about the customers performing those transactions. A common misconception is that blockchain networks such as Bitcoin are unidentified when they are confidential.

When a user makes a public transaction, their specific code, known as the public key, is entered into the Blockchain instead of their personal information. Although a person’s identity is still tied to their blockchain address, this prevents hackers from accessing the user’s personal information, even when the bank is hacked.

Secure transaction

Once the transaction is recorded, the blockchain network must verify its authenticity. Thousands or even millions of computers on the Blockchain will ensure that the purchase details are correct. After ascertaining the computer transaction, it is added to the Blockchain as a block. Each block in the Blockchain has its own distinctive hash, preceded by a block’s unique hash. When a block’s information is modified in any way, the hash code of that block changes – however, the block code does not have a hash code. This difference is complicated to switch to the Blockchain without notice.


While private information remains private on the Blockchain, the technology is almost always open source. This requires that users on the blockchain network alter the code as they see fit, as long as they don’t have much of the network’s computing power. Keeping data in the blockchain open source can also make data more difficult. With millions of computers connected with the blockchain network at any given time, it is improbable that anyone will see the changes.

Blockchain Technology Disadvantages

While Blockchain has essential decisions, there are significant challenges to its adoption. Obstacles in the application of blockchain technology are not technological today. The real problems are political and regulatory, not to mention the thousands of hours of custom software design and back-end programming required to integrate Blockchain into existing business networks. There are some challenges on the way to adopting a comprehensive blockchain.

The cost of technology

While Blockchain can save users money on transaction fees, the technology is free. The “proof of work” system used to verify bitcoin transactions, for example, consumes large amounts of computing power. In the actual world, the power of millions of computers in the bitcoin network is close to what Denmark spends annually. All that energy costs money, and according to a recent study by research firm Elite Fixtures, the mining cost of single bitcoins varies from $ 531 to $ 26,170.

Based on average consumption expenditures in the United States, this figure is closer to $ 4,758. Despite the cost of mining bitcoins, consumers continue their electricity bills to verify transactions on the Blockchain. Because when miners add a block to a bitcoin blockchain, they are rewarded with enough bitcoin to make their time and energy worth it. When it comes to blockchains that do not use cryptocurrency, miners have to pay or are encouraged to verify the transaction.

Speed ​​Disability

Bitcoin is the perfect case study for Blockchain’s inefficiencies. Bitcoin’s “proof of function” system takes ten minutes to add a new block to the Blockchain. At that rate, the blockchain network is estimated to handle only seven transactions each second (TPS). While other cryptocurrencies such as Ethereum (20 TPS) and Bitcoin Cash (60 TPS) outperform Bitcoin, they are still limited by Blockchain. Legacy brand Visa, for reference, can process up to 24,000 TPS.

Illicit activity

Privacy on the blockchain network protects users from hacks and protects privacy, but it also allows for illegal trading and functionality on the blockchain network. The most cited example of using Blockchain for unlawful transactions is probably Silk Road, an online “dark web” marketplace that operated from February 2011 to October 2013, when it was blackout by the FBI.

The website allows users to browse without tracking and make illicit purchases on bitcoins. Existing U.S. regulation prevents customers from online trades built on blockchains from full anonymity. In the United States, when online exchanges open an account about their customers, verify each customer’s identity, and ensure that customers do not appear on the list of identified or suspected terrorist organizations.

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The central bank is concerned.

Several central banks and the Federal Reserve, Bank of Canada, and the Bank of England have begun investigating digital currencies. According to a February 2015 Bank of England research report, “Further research will require the central bank to devise a system of delivering distributed ledgers without the ability to control its currency and protect the system against systemic attack.” Technology can be used. ”

Hack Sensitivity

51% of new cryptocurrencies and blockchain networks are vulnerable. These attacks are difficult to implement due to the computational power required to regain control of most of the blockchain network. Still, Joseph Bonneau, a researcher at NYU’s Computer Science, said it could be changed. Bonneau released a report last year showing that 51% of attacks are expected to escalate, as hackers can now rent bus computing power instead of buying all the equipment.

What’s next for Blockchain?

Originally proposed as a research project in 1991, the Blockchain is comfortably settled in the late twenties. Like most Millennials of its age, the Blockchain has seen its fair share of public scrutiny over the past two decades, and businesses around the world are speculating on what technology is capable of and where it will be in the coming years.

Blockchain is, after all, getting a name for itself at the age of twenty-seven, due to bitcoin and cryptocurrencies, with many applied applications for technology already implemented and discovered. As the debate on every investor’s tongue in the country, Blockchain means making business and government functions more accurate, efficient, and secure.

As we prepare to enter the thirties of the Blockchain, it is no longer a question of “if” legacy companies are grabbing technology – it’s a question of “when.”


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