# Blockchain: The Foundation of Web3

By [Timi Does Web3](https://paragraph.com/@timi-does-web3) · 2025-03-14

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Think of it as a digital ledger distributed across many computers worldwide instead of being stored in one place. This **Distributed Ledger Technology** means that no single entity is controlling the data, making it decentralized, secure and transparent.

Okay, let me break it down with the **Microsoft Word vs. Google Docs** analogy:

*   A traditional bank’s ledger is like Microsoft Word, and only one person can edit at a time and it is not necessarily transparent or accessible to everyone in real-time.
    
*   The blockchain on the other hand is like Google Docs, meaning everyone with access or network participants can see the same document in real time, and changes are instantly updated for everyone.
    

Key Concepts To Keep In Mind
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### Blocks

A block is basically a container of data that stores information. It would usually contain:  
🔹 Transaction details  
🔹 Timestamp  
🔹 Hash of the previous block

### Chain

When blocks are connected to each other in chronological order, the form a Chain. (Block-Chain…get it?? 💡)

### Distributed Ledger

Like I mentioned earlier, a distributed ledger stores data across different nodes around the world. This helps to prevent hacking or data manipulation.

### Consensus Mechanisms

As we now know, there is no central authority in blockchain, so the nodes agree on a transaction before adding it to the blockchain. Now this “agreement,” is done via various methods, and the two common ones include:

*   Proof of Work (PoW):  
    This is used by Bitcoin, and miners solve complex puzzles to validate transactions.
    
*   Proof of Stake (PoS):  
    This is used by Ethereum. With PoS, validators stake/lock their coins to validate transactions.
    

### Hashing

Hashing transforms any input into a fixed-length code or string of characters. Think of it as a unique fingerprint for the inputted data, so any little alteration will cause a change in the hash.

For example, if we use a hash function on the word “Blockchain”, even a slight change such as changing “B” to “b” will return a different result as seen below:

    SHA-256("Blockchain") →  6dcd4ce23d88e2ee956f9f79cffb42a4b2a2863a945b2446b8c2b5e23b3e7e77
    
    SHA-256("blockchain") →  d7a8fbb307d7809469a78d6e02e37f8283a4d126ec29d72ed367e742e6513068
    

(…more on hashing later)

Timi, How Does Blockchain Work?
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Let’s say you want to send me 1 Bitcoin (I really don’t mind in real life), here’s what happens on the backend;

*   **Step 1: Transaction initiation**  
    First, you initiate a transaction request using your crypto wallet, and you input my wallet address.
    
*   **Step 2: Broadcasting to the node network**  
    The peer-to-peer (p2p) network of nodes receive your transaction and validates it. (_remember consensus?)_
    
*   **Step 3: Block creation**  
    After validation, your transaction is linked to the previous block using the cryptographic hash.
    
*   **Step 4: Transaction complete**  
    Now that this transaction is added to the blockchain and cannot be altered, I now own 1 Bitcoin.
    

**How is the Blockchain applied?**
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*   **Cryptocurrency**  
    The most popular use-case of the blockchain is cryptocurrency, and I have pretty much explained how it works in the previous section.
    
*   **Smart** **Contracts**  
    These are self-executing contracts requiring no middle-man. Think of it like a digital vending machine (…more on smart contracts later, so subscribe if you haven’t!)
    
*   **Supply Chain Tracking**  
    To prevent fraudulent activity, companies now use the blockchain to track their products from manufacturing to delivery.
    
*   **DeFi & NFTs**  
    The blockchain is changing finance and ownership, by removing entities like banks out the way with Decentralized Finances, and letting you own digital assets as Non-Fungible Tokens.
    

That being said, the blockchain is much more than crypto and is a revolutionary technology with more applications.

If you’re excited to learn more about Web3 & Decentralization in a simplified way, please hit the **SUBSCRIBE** button!

### **WAGMI!**

> _Thanks for reading. My name is Timi Lawani — I am a_ **_Data Analyst & Tech Content Creator_** _passionate about simplifying Web3 and technical concepts._
> 
> _You can connect with me on_ [**_LinkedIn_**](https://www.linkedin.com/in/hellotimilehin/) _and via_ [_Email_](http://hellotimilehin@gmail.com/)_; I would love to hear from you!_

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*Originally published on [Timi Does Web3](https://paragraph.com/@timi-does-web3/blockchain-the-foundation-of-web3)*