A blockchain is a decentralized, digital ledger that records transactions across a network of computers. It is the technology that powers cryptocurrencies such as Bitcoin and Ethereum, but it has many potential use cases beyond just digital currencies.

Blockchain technology, also known distributed ledger technology (DLT) is a decentralized digital ledger that records transactions across a network of computers by using cryptographic hashing. It is the technology that powers cryptocurrencies such as Bitcoin & Ethereum, but it has many potential use cases beyond just digital currencies.

At its core, a blockchain is a chain of blocks that contains information about transactions. Each block in the chain contains several transactions, and once a block is added to the chain it cannot be altered. This creates a tamper-proof record of all transactions that have taken place on the blockchain. A blockchain is decentralized, meaning that there is no central entity who controls it. Instead, the blockchain is maintained by a network of computers, called nodes, that work together to validate transactions and add them to the blockchain. This decentralization ensures that no single entity can manipulate the blockchain which therefore makes it more secure and trustworthy. Another important feature of a blockchain is its use of cryptography to secure transactions. Each block in the chain contains a unique code, called a hash, that is created by the nodes.

To summarise this in simple terms, imagine a football league. Each game has a score at the end of play which is decided upon by the player sand referees. Once agreed, these scores can’t be changed. The scores are recorded and used to determine a position in the league, and we can look back over the years of a historical record of all the game scores. Well, blockchain technology isn’t all that different. Except your scores are transactions, your players are your network nodes and the blockchain is the historical league record.

Blockchains can be public or private. Public blockchains, such as Bitcoin and Ethereum, are open for anyone to participate in and can be accessed by anyone. Private blockchains on the other hand are restricted to a specific group of participants and are often used by organisations for internal processes.

What is Cryptographic Hashing?

Cryptographic hashing plays a crucial role in the world of cryptocurrencies. Let’s take a closer look at what cryptographic hashing is, how it works, and why it’s so important for the security and integrity of cryptocurrencies.

Cryptographic hashing is the process of taking an input and passing it through a hash function. The hash function then produces a fixed-size output also known as a hash. In theory, a cryptographic hash function shouldn’t be able to generate the same hash output from two different input values or to determine the original input value from its hash value.

So, bringing this back to the topic of cryptocurrencies which we now know run on a blockchain, cryptographic hashing is used in various ways to ensure the security and integrity of the system. For example, when anew transaction is added to the blockchain, it is first passed through a cryptographic hash function and the resulting hash is then added to the previous block in the blockchain, creating a chain of hashes that link each block together. Cryptographic hashing is also used in the process of mining new Bitcoins. This proof-of-work process involves the miner’s racing to find a specific hash value and the ‘winner’ of the race, the person to find a valid hash, is rewarded with a certain amount of Bitcoin. This process is known as “proof-of-work” and is used to confirm transactions and add new blocks to the blockchain.

Now, cryptographic hashing isn’t just used in the financial side of blockchain technology. They can also be used for digital signatures which are used to prove the authenticity of a transaction.

So why do we need to hash our data? It simply ensures the integrity and security of the blockchain and the authenticity of transactions, making it an essential part of any cryptocurrency system.

What is a Node?

In a blockchain network, a node is a computer or device that maintains a copy of the blockchain and participates in the process of validating transactions and adding them to the blockchain. Each node has a copy of the entire blockchain and can validate transactions independently of other nodes. This decentralized architecture ensures that the network is not controlled by a single entity and makes it resistant to tampering and censorship.

In addition to validating and relaying transactions, nodes also play a critical role in the process of reaching consensus in a blockchain network. Consensus algorithms such as Proof of Work (PoW) and Proof of Stake (PoS) rely on nodes to validate and reach agreement on the state of the network making them a fundamental part of the system.

What is a Blockchain used for?

We mentioned earlier in the article that one of the most popular and widely used application of blockchain technology is cryptocurrency. The concept of cryptocurrency allows for digital currency transactions to occur without the need for intermediaries such as banks or solicitors. It’s a decentralized asset which therefore means you own your crypto assets and you can do as you please with minimal limitations unlike traditional finance where the banks place limits and restrictions when accessing or transferring fiat. The most popular blockchains used as a means of financial transfer are Bitcoin, Ethereum, Binance Smart Chain, Polygon and Cronos.

Source: Image by Victor at picjumbo

Blockchains aren’t just used for cryptocurrencies though. Additionally, blockchain has the potential to help innovate and improve a wide range of industries. Let’s look at some examples below.

The list goes on… Essentially anything that requires digital data storage or transfer. Blockchain technology may well be the answer and as traditional businesses begin to migrate and upgrade their systems onto the blockchain, it is highly likely more use cases will become apparent in the not so distant future! We hope this article has given you an overview of what a Blockchain is, how it works and how it can be utilised to improve traditional systems.