What Is a Block-chain? - NullClass

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What Is a Block-chain?

What Is a Block-chain?


How does a blockchain work - Simply Explained - YouTube


A block-chain is a distributed database that is shared among the nodes of a computer network. As a database, a blockchain stores and contains information electronically in digital format. Blockchains are best known for their crucial and vital role in cryptocurrency systems, such as Bitcoin, for maintaining a secure and decentralized record of transactions. The innovation with a blockchain is that it guarantees the fidelity and loyalty and security of a record of data and generates trust without the need for a very trusted third party.

One key difference between a typical database and a block-chain is how the data is in a structured manner. A blockchain collects the information together in groups, which are known as blocks, that holds multiple sets of information. Blocks have certain amount of storage capacities and, when filled, are closed and linked to the previously filled block, forming a chain of the data known as the block-chain. All of the new information that follows that freshly added block is compiled and integrated into a newly formed block that will then also be added to the chain once it gets filled.

A database usually structures its data into the form of tables, whereas a block-chain, like its name implies, structures its data into the form of chunks (blocks) that are strung together. This data structure inherently makes an irreversible time line of the data when it gets implemented in a de-centralized nature. When a block is completely filled, it is set in stone and it becomes a part of this time line. Each block in the chain is given an exact and a precise time stamp when it is added and integrated to the chain.

Key Takeaways

  • Block-chain is a type of shared database that differs and varies from a typical database in the way that it stores the information; block-chains store data in blocks that are then linked together through cryptography.
  • As new data comes in, it is entered into a fresh and new block. Once the block is filled with the data, it is chained onto the previous or the last block, which makes the data gets chained together in chronological order.
  • Different types of the information can be stored ar kept together on a block-chain, but the most common use so far has been as a ledger for the purpose of transactions.
  • In case of the Bitcoin’s, block-chain is used in a decentralized way so that no single person or group has the main control—rather than this, all the users collectively retain the control.
  • Decentralized block-chains are immutable, which means that the data gets entered cannot be reversed. For the purpose of Bitcoin, this means that the transactions are permanently recorded and saved and viewable to just about anyone.

How Does a Block-chain Work?


Blockchain Explained: How does a transaction get into the blockchain? |  Euromoney Learning


The goal of a blockchain is to allow and enable the digital information to be recorded and saved and even get distributed, but cannot be updated or edited. In this way, a block-chain is the foundation or the very essence for immutable ledgers, or filed and records of the transactions that cannot be altered, deleted, or destroyed. This is why block-chains are also known as a distributed ledger technology (DLT).

First proposed as a research project in the year 1991,1 the concept of block-chain predated its first widespread application in the use: Bitcoin, in the year 2009. In the years since, the use of block-chains has exploded through the creation of various cryptocurrencies, decentralized finance (DeFi) applications, or the non-fungible tokens (NFTs), and smart contracts.

Transaction Process

Attributes of Cryptocurrency


Block-chain Decentralization


Centralized systems with intermediaries versus decentralized blockchain...  | Download Scientific Diagram


Imagine that a company owns a server farm with 10,000 computers used to maintain and manage a database holding all of its client’s account information. This company owns a warehouse building that contains all of these computers under just one roof and has full control of each of these computers and all of the information contained within them only. This, anyways, provides a single point of failure. What happens if the electricity at that particular location goes out? What if the Internet connection gets severed? What if it burns to the very ground? What if a bad actor or a film-star erases everything with just a single keystroke? In any case, the data is lost or gets corrupted.

What a block-chain does is to allow or enable the data held in that database to be spread out amongst the several network nodes at various locations. This not only creates or forms the data redundancy but also maintains the fidelity of the data stored ergo—if somebody tries to alter or change a record at one instance or moment of the database, the other nodes would not be altered or changed and thus would prevent a bad actor from doing so. If one user tampers or plays with Bitcoin’s record of transactions, all of the other nodes would cross-reference each other and easily pinpoint to that node with the incorrect or wrong information. This system helps to establish an exact and a precise and also a transparent order of the events. This way, no single node within the network can alter or change the information held within it.

Because of this, the information and even the history (such as of the transactions of a cryptocurrency) are irreversible. Such sort of a record could be a list of the transactions (such as with a cryptocurrency), but it also is possible for a block-chain to hold a miscellany of the other information like legal contracts, the state identifications, or even a company’s product inventory.


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December 24, 2021

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