Bella Szabo

Senior Marketing Manager @ RZLT

What Is Blockchain?

Jan 7, 2025

A Simple Explanation Using Everyday Examples

Bella Szabo

Senior Marketing Manager @ RZLT

What Is Blockchain?

Jan 7, 2025

A Simple Explanation Using Everyday Examples

Understanding blockchain doesn’t need to be confusing. Imagine a notebook that everyone can see but no one can erase. Every time someone writes in it, the page is visible to everyone, and once it’s filled in, it stays there. That notebook is like a blockchain: public, secure, and permanent.

Let’s walk through how it works step by step.

Think of Blocks as Pages

Picture a notebook. Every page can hold a certain number of entries. In a blockchain, each of these pages is referred to as a “block.” When people carry out transactions such as sending money or confirming an agreement, those records are written on the next available block.

Once the block is full, it’s sealed off, like turning a finished page in your notebook.

Now, Imagine Chains Holding the Pages Together

Each block is connected to the previous one using a special code that’s generated based on the information inside the block. This code is unique if even one letter changes, the code changes too.

These codes are what “chain” the blocks together, forming a timeline of events. If someone tried to go back and change a record, it would break the chain, making it obvious that something had been tampered with.

This design ensures consistency, safety, and tamper-evidentness.

Shared Access, No Middlemen

Unlike a private notebook kept in a drawer, this blockchain notebook is replicated across multiple computers worldwide. Everyone holds the same version, and a group must approve any new entry. This way, no single person controls the whole notebook.

It also means there is no need for a central authority such as a bank to approve or record each entry.

Why Blockchain Is Useful

Blockchain’s structure makes it valuable for more than just cryptocurrency. Its ability to store unchangeable, shared records is being applied across many industries. Here are a few practical examples:

  • Tracking food supply chains
    Companies like Walmart use blockchain to trace the origin of produce. If there’s a safety recall, say for lettuce, it takes seconds (not days) to identify the exact source and affected batches.


  • Verifying digital identity
    Projects like ID2020 utilize blockchain to provide people, especially those in underbanked regions, with secure digital IDs. This can help them access healthcare, vote, or financial services.


  • Storing medical records
    MediBloc and similar platforms let patients control their health data on a blockchain, reducing the risk of mismatched or lost records between hospitals.


  • Managing digital ownership of assets
    NFTs (non-fungible tokens) are one example. Platforms like OpenSea utilize blockchain to verify ownership of digital art or virtual items, eliminating the need for a central authority.

Since records can’t easily be changed and everyone has access to the same data, blockchain is considered reliable for storing any information where accuracy and transparency are important.

How This Affects You

If you’re curious about how digital money like Bitcoin works or why companies are building new apps on blockchain, this is the foundation. You don’t need to understand all the technical layers. Just knowing that it’s a shared notebook of records that can’t easily be edited helps clarify why it’s gaining attention.

Blockchain isn’t just a tech buzzword; it’s a different way of organizing and confirming actions across the internet.

Want to Learn More?

If you're curious about how blockchain connects to everyday tools like Bitcoin or digital wallets, explore our beginner-friendly articles:

What is Bitcoin?
What is a Crypto Wallet?

We’re adding more clear and useful explanations every week. To learn how blockchain fits into product development or digital experiences, visit us at rzlt.io.

Understanding blockchain doesn’t need to be confusing. Imagine a notebook that everyone can see but no one can erase. Every time someone writes in it, the page is visible to everyone, and once it’s filled in, it stays there. That notebook is like a blockchain: public, secure, and permanent.

Let’s walk through how it works step by step.

Think of Blocks as Pages

Picture a notebook. Every page can hold a certain number of entries. In a blockchain, each of these pages is referred to as a “block.” When people carry out transactions such as sending money or confirming an agreement, those records are written on the next available block.

Once the block is full, it’s sealed off, like turning a finished page in your notebook.

Now, Imagine Chains Holding the Pages Together

Each block is connected to the previous one using a special code that’s generated based on the information inside the block. This code is unique if even one letter changes, the code changes too.

These codes are what “chain” the blocks together, forming a timeline of events. If someone tried to go back and change a record, it would break the chain, making it obvious that something had been tampered with.

This design ensures consistency, safety, and tamper-evidentness.

Shared Access, No Middlemen

Unlike a private notebook kept in a drawer, this blockchain notebook is replicated across multiple computers worldwide. Everyone holds the same version, and a group must approve any new entry. This way, no single person controls the whole notebook.

It also means there is no need for a central authority such as a bank to approve or record each entry.

Why Blockchain Is Useful

Blockchain’s structure makes it valuable for more than just cryptocurrency. Its ability to store unchangeable, shared records is being applied across many industries. Here are a few practical examples:

  • Tracking food supply chains
    Companies like Walmart use blockchain to trace the origin of produce. If there’s a safety recall, say for lettuce, it takes seconds (not days) to identify the exact source and affected batches.


  • Verifying digital identity
    Projects like ID2020 utilize blockchain to provide people, especially those in underbanked regions, with secure digital IDs. This can help them access healthcare, vote, or financial services.


  • Storing medical records
    MediBloc and similar platforms let patients control their health data on a blockchain, reducing the risk of mismatched or lost records between hospitals.


  • Managing digital ownership of assets
    NFTs (non-fungible tokens) are one example. Platforms like OpenSea utilize blockchain to verify ownership of digital art or virtual items, eliminating the need for a central authority.

Since records can’t easily be changed and everyone has access to the same data, blockchain is considered reliable for storing any information where accuracy and transparency are important.

How This Affects You

If you’re curious about how digital money like Bitcoin works or why companies are building new apps on blockchain, this is the foundation. You don’t need to understand all the technical layers. Just knowing that it’s a shared notebook of records that can’t easily be edited helps clarify why it’s gaining attention.

Blockchain isn’t just a tech buzzword; it’s a different way of organizing and confirming actions across the internet.

Want to Learn More?

If you're curious about how blockchain connects to everyday tools like Bitcoin or digital wallets, explore our beginner-friendly articles:

What is Bitcoin?
What is a Crypto Wallet?

We’re adding more clear and useful explanations every week. To learn how blockchain fits into product development or digital experiences, visit us at rzlt.io.

About RZLT

RZLT is an AI-Native Web3 Marketing Agency helping 100+ leading protocols and startups grow, scale, and reach new markets. From data-driven strategy to content, community, and growth optimization, we've helped generate over 200M+ impressions and drive $100M+ in TVL.

Stay ahead of the curve.
Follow us on X, LinkedIn, or subscribe to our newsletter for no BS insights into Web3 growth, AI, and marketing.

About RZLT

RZLT is an AI-Native Web3 Marketing Agency helping 100+ leading protocols and startups grow, scale, and reach new markets. From data-driven strategy to content, community, and growth optimization, we've helped generate over 200M+ impressions and drive $100M+ in TVL.

Stay ahead of the curve.
Follow us on X, LinkedIn, or subscribe to our newsletter for no BS insights into Web3 growth, AI, and marketing.

Let’s rewrite the playbook.

Contact us

Let’s rewrite the playbook.

Contact us

Let’s rewrite the playbook.

Contact us