Blockchain Definition
A blockchain is a distributed and immutable digital database, or ledger, that records and facilitates peer-to-peer transactions.
Blockchain technology became known for the role it plays in cryptocurrency networks, such as Bitcoin or Ethereum, as a legitimate method of recording data in a secure and decentralized way. However, the concept behind the present-day blockchain was first proposed as early as 1982.
In the years since, the use of blockchains has expanded considerably due to the creation of various cryptocurrencies, decentralized finance (DeFi) applications, non-fungible tokens (NFTs), and smart contracts.
The goal of blockchain is to allow digital information to be recorded and distributed, but not edited. In this way, a blockchain is a foundation for immutable ledgers or records of transactions that cannot be altered, deleted, or destroyed. This is why blockchains are also known as distributed ledger technology (DLT).
What makes blockchain technology innovative is that it enhances the way we record and exchange information.
Differences between Blockchain and Traditional Databases
One of the main differentiating features of blockchain is the way the data is structured.
While traditional databases generally structure their data into tables, a blockchain collects and structures data in batches, typically called blocks. The blockchain structure also withholds various sets of information that are tied together.
These blocks have certain storage capacities and, when filled, are closed for more data. Additionally, they are linked to the previously filled block, forming a chain of data known as the blockchain.
The new information that follows will be compiled into a new block, which will then also be added to the chain previously filled. Each additional block strengthens the verification of the previous block and hence the entire blockchain.
Once a block has been completed, the information cannot be changed or undone. The blockchain data structure inherently makes an irreversible timeline of data, considering that each block is given an exact timestamp when it is added to the chain.
As a result, the blocks form a chain of data as an asset moves from place to place or ownership changes.
Why Blockchain is important
We live in the era of information. All institutions, governments, and businesses run and depend on information. Being able to increase the speed and accuracy of information will have a positive effect on the performance of such entities.
Blockchain is ideal for delivering information as it provides immediate and transparent data, which has been stored on an immutable ledger. As an extra layer of security, it can be accessed only by allowed network members.
A blockchain network can track orders, payments, accounts, production, and much more.
All members can see the details of a transaction from front to end, highlighting historical transactions, thus offering greater confidence, as well as a different level of efficiency, performance, and opportunity.
Key Attributes of Blockchain
Distributed Ledger Technology
As all network participants have access to the same data across the blockchain network, and knowing that the data is immutable, this enhances the trust and transparency of the information.
Immutable Data Records
As we already mentioned, no participant or external actor can modify or tamper with a transaction after it’s been recorded into the blockchain’s shared ledger network.
If a transaction record includes an error, a new transaction must be added to reverse the error, and both transactions are then visible.
When a transaction is stored on the network, all participants can see it. Thus a blockchain is a distributed ledger.
Each transaction is assigned a unique number, often referred to as “nonce” – a number only to be used once. It is then recorded as part of a block of data, along with other transactions facilitated in a specific time frame.
Decentralization
As the network is not governed by a single point of authority, it is thus decentralized. The recording and maintenance of data are fulfilled by groups of nodes – made up of multiple network participants.
As the system isn’t dependent on any governing authority, new users can join the network at any given time and record their information, store their assets or transact anything such as cryptocurrencies, important documents, contracts, or other valuable digital assets.
Security
Along with the immutable, distributed, and decentralized nature of blockchain technology, the implementation of encryption ensures users and the data themselves benefit from another layer of security.
Cryptography is represented by complex mathematical algorithms that are used to hash information cryptographically. Simply put, the information on the network hides the true nature of the data.
For this process, any input data gets through a mathematical algorithm that produces different kinds of values with a fixed length.
Consider it as a unique identification for every data. All the blocks in the ledger come with a unique hash of their own and contain the hash of the previous block.
Therefore, changing or trying to tamper with the data will mean changing all the hash IDs, which is not permitted by the already built-in nature of the blockchain network.
Anonymity
The use of cryptography to protect the integrity of data automatically extends into another key attribute of blockchain, the anonymity of participants.
This feature, however, is by far one of the most controversial.
As you will learn in the later parts of our Blockchain Basics Education Guide, the anonymous attribute has also enabled various criminal activities, as bad actors can hide and transact assets using the anonymity and other use cases of blockchain technology and cryptocurrencies.
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