Types of Blockchain: Meaning, Examples and Comparison

Quick Overview: Types of Blockchain

• A blockchain is a decentralized digital ledger that records transactions securely in linked blocks, making the data transparent, tamper-proof, & verifiable without relying on a central authority.
• Blockchain access is defined by two levels: permissionless and permissioned. This distinction sets participant eligibility and validation authority.
• There are four main types of blockchains: public, private, consortium, and hybrid. Public is permissionless, while private is permissioned. Consortium & hybrid introduce shared or mixed control structures.
• Choosing a blockchain type requires balancing security, speed, cost, and regulatory compliance. The choice should match the application's specific needs.

In this blog, you will learn about the main types of blockchain, how they differ, and which one fits which use case. We will cover public, private, consortium, and hybrid blockchains in detail, including real examples, a comparison table, and answers to common questions about blockchain types.

If you're curious about how technologies like blockchain connect to data-driven fields, upGrad's Data Science courses can help you build the skills to work with real-world data, from analytics to machine learning, and open doors across industries adopting these technologies.

What Are the Different Types of Blockchain?

Different types of blockchains vary in access, control, and use cases. Each blockchain is designed to meet specific business and security requirements. There are four main types of blockchain technology:

• Public blockchain – It is open to anyone and is fully decentralized.
• Private blockchain – It has restricted access and is controlled by one organisation.
• Consortium blockchain- It is managed by a group of organizations collectively.
• Hybrid blockchain – It is a mix of public and private features.

Each type of blockchain controls who can join the network, and who gets to validate transactions. That single difference changes everything else about how the blockchain behaves, from speed to security to cost.

Also Read: Understanding the Basics of Blockchain: A Comprehensive Guide

Type	Access	Control	Example
Public	Open to all	Fully decentralized	Bitcoin, Ethereum
Private	Restricted	Single organisation	Internal enterprise ledgers
Consortium	Restricted to members	Group of organizations	Banking networks, supply chain groups
Hybrid	Selectively open	Mixed	Combination of public and private nodes

Permissioned vs Permissionless Blockchain

Before we look at the four types of blockchains individually, it is important to understand how blockchains are classified as permissionless or permissioned.

• A permissionless blockchain lets anyone join the network, read the ledger, and take part in validating transactions. No approval is needed. Bitcoin and Ethereum work this way.
• A permissioned blockchain requires approval before someone can join or validate transactions. Access is controlled by an admin or a group of admins. Private and consortium blockchains both fall under this category.

Permissioned and permissionless describe the access rule. Public, private, consortium, and hybrid describe how that rule is applied in practice. The four types we cover below all fall under one of these two categories.

Related Read: A Complete Guide to Distributed Ledger Technology

Four Types of Blockchains

Blockchain networks can be designed in different ways depending on who can join, who can validate, and how much control is shared.
The four main types of blockchains are public, private, consortium, and hybrid, each suited to different use cases.

1. Public Blockchain

A public blockchain is a network anyone can join without requiring permission. Anyone can view transactions, send transactions, and help validate the network by running a node.

Features of Public Blockchain

• It is fully decentralized, with no single owner.
• It has an open ledger, and anyone can view every transaction.
• It has high transparency and trust.
• It uses consensus mechanisms such as proof of work or proof of stake.
• However, it has slower transaction speeds than private networks.

Bitcoin Is an Example of Which Type of Blockchain?

Bitcoin is a classic example of a public blockchain. Anyone in the world can download the Bitcoin software, join the network, and start validating transactions. There is no single company or central authority controlling it.

Ethereum works the same way as Bitcoin. Both are open, permissionless, and fully decentralised, which is why they are often used as the textbook example when people ask about types of blockchain technology.

Advantages and Limitations of Public Blockchain

Public blockchains offer unmatched transparency and decentralization but also face challenges like slower performance and higher energy consumption.

Advantages	Limitations
No central point of failure.	Slower transaction speed at scale.
Strong security due to wide network participation.	High energy use in proof of work systems.
Full transparency builds trust among users.	Not suitable for businesses that need to keep data private.

2. Private Blockchain

A private blockchain restricts access. Only approved members can join, view data, or validate transactions. A single organisation usually controls the entire network.

Features of Private Blockchain

• It is controlled by one organization.
• Transactions are faster because fewer nodes validate data.
• Data stays private within the organisation.
• Easier to update rules because a single entity manages the network.

Private Blockchain for Enterprise Business

Private blockchain is a strong fit for enterprise business use because companies often need to keep records internal while still gaining the benefits of a shared, tamper-resistant ledger. Banks, insurance companies, and large manufacturers use private blockchain to track internal processes such as inventory, claims, or compliance records without exposing that data publicly.

Private Blockchain Security Concerns

While private blockchain keeps data controlled, it does raise some private blockchain security concerns worth knowing:

• A single point of control means a compromised admin account can affect the whole network.
• Fewer validating nodes can make the network less resistant to internal fraud.
• Trust depends heavily on the organisation running it, not on the network itself.

These concerns do not make private blockchain unsafe. They simply mean the security model is different from a public blockchain, and organisations need strong internal controls to manage it well.

3. Consortium Blockchain

A consortium blockchain sits between public and private. Instead of one organisation controlling the network, a group of organisations shares control.

How Consortium Blockchain Works

In a consortium blockchain, a set of pre-selected organisations act as validators. No single member has full control. Decisions about network rules usually need agreement from most or all members. This setup works well when multiple companies need to share data but none of them wants to hand over full control to a single party.

Examples and Applications of Consortium Blockchain

• A group of banks using a shared ledger for interbank settlements.
• Supply chain partners tracking goods across multiple companies.
• Healthcare networks sharing patient records between hospitals with permission controls.

Consortium blockchain gives businesses shared trust without full public exposure. It is often the preferred structure when competitors or partners need to collaborate on the same data without one party holding all the power.

4. Hybrid Blockchain

A hybrid blockchain combines elements of both public and private blockchain. Some parts of the network stay open, while other parts remain restricted.

How Hybrid Blockchain Combines Public and Private Features

In a hybrid setup, an organisation can keep sensitive data on a private chain while still using a public chain layer for transparency or verification. This gives businesses flexibility. They can choose exactly what stays private and what becomes publicly visible.

Hybrid Blockchain Use Cases

Hybrid blockchain use case solutions are common in industries that need both privacy and public trust at the same time:

• A retail company keeping pricing data private while making product authenticity checks public.
• A government system keeping citizen data restricted while publishing certain records for public verification.
• A real estate platform keeping buyer details private while making ownership records publicly verifiable.

This flexibility is why hybrid blockchain is growing in industries where full transparency is not required for every piece of data, but some level of public trust still matters.

Also Read: Blockchain Tutorial for Beginners: Learn Blockchain Basic Concepts.

upGrad's Executive Post Graduate Certificate Programme in Data Science & AI from IIITB helps you build these in-demand skills, from data analytics to machine learning and AI, backed by IIIT Bangalore's academic rigor and industry-relevant curriculum. Explore the programme and take the next step toward a career in Data Science & AI.

Blockchain Protocols, Nodes, and Blocks by Type

Blockchain Protocols are the foundational rules and mechanisms that define how a blockchain network operates, allowing participants to securely validate transactions, reach consensus, and maintain a shared ledger without a central authority.

Different blockchain types often run on different protocols, and it helps to know a few names when researching types of blockchain technology.

Protocol	Common Type	Known For
Ethereum	Public	Smart contracts, open network
Hyperledger Fabric	Private/Consortium	Enterprise use, modular design
Corda	Consortium	Financial industry use
Quorum	Hybrid/Consortium	Built on Ethereum, enterprise-focused

Also Read: Top Features of Hyperledger Fabric You Should Know

Types of Nodes in Blockchain

Every blockchain type relies on nodes to keep the network running. The main types of nodes in blockchain include:

• Full nodes – store the complete copy of the ledger and validate all transactions.
• Light nodes – store only part of the data and rely on full nodes for verification.
• Mining or validator nodes – responsible for confirming and adding new transactions.
• Master nodes – perform special functions like governance in some networks.

The number and type of nodes a network allows depends heavily on whether it is public, private, or consortium based.

Types of Blocks in Blockchain

Blocks in Blockchain are digital records that group verified transactions together, with each block securely linked to the previous one, forming a chronological and tamper-resistant chain.

A blockchain is literally made of blocks linked together. The main types of blocks in blockchain include:

• Genesis block – the very first block in any blockchain.
• Regular blocks – standard blocks containing transaction data.
• Orphan blocks – valid blocks that get rejected because another block was added to the chain first.

Understanding blocks and nodes helps explain why some blockchain types process transactions faster than others. Fewer nodes and simpler block validation usually mean quicker transaction times.

Comparing Different Types of Blockchain

When you compare different types of blockchain side by side, the differences become clearer.

Feature	Public	Private	Consortium	Hybrid
Access	Open to all	Restricted	Restricted to members	Mixed
Control	Decentralised	Single organisation	Group of organisations	Mixed
Speed	Slower	Fast	Fast	Moderate
Transparency	Very high	Low	Moderate	Selective
Best for	Cryptocurrency,  open networks	Internal enterprise use	Multi-party business collaboration	Flexible privacy needs

1. Public vs Private Blockchain

Public blockchain trades speed for openness. Private blockchain trades openness for speed and control. If your priority is trust without a central authority, public wins. If your priority is data control and faster processing, private wins.

2. Public vs Permissioned Blockchain

Public blockchain is permissionless by nature. Permissioned blockchain, which includes private and consortium types, requires approval to join. The core difference comes down to who is allowed to participate.

3. Consortium vs Private Blockchain

Both are permissioned, but consortium blockchain is controlled by multiple organisations while private blockchain is controlled by just one. Consortium works better when trust needs to be shared across partners.

4. Hybrid vs Public Blockchain

Public blockchain has no private layer at all. Hybrid blockchain lets you choose what stays private and what goes public, giving more control without giving up all transparency.

How to Choose the Right Type of Blockchain

Choosing the right type of blockchain depends on what your business or project actually needs.

Which Type of Blockchain Is Most Secure?

Public blockchain is generally considered the most secure against outside attacks because it has thousands of nodes validating transactions, making it very hard to alter data. However, private and consortium blockchains can be more secure against internal misuse since access is tightly controlled. Security depends on what threat you are protecting against.

Which Blockchain Type Is Best for Enterprise?

For most enterprise needs, private or consortium blockchain works best. They offer faster transactions, controlled access, and the ability to keep sensitive business data internal. Public blockchain scalability problems, like slow transaction speed and rising costs during high network use, make it less practical for large-scale enterprise operations that need speed and predictability.

Blockchain Type for Data Privacy Compliance

If your business needs to meet strict data privacy compliance rules, private or consortium blockchain is usually the safer choice. These types let you control exactly who accesses data, which makes it easier to meet regulations that public blockchain cannot fully support due to its open nature.

Types of Blockchain Use Cases by Industry

• Types of blockchain for supply chain – consortium blockchain works well since multiple partners need shared visibility without giving up full control.
• Blockchain types for banking and finance – private and consortium blockchain dominate here due to regulatory needs and the requirement for fast, controlled transactions.
• Healthcare – hybrid or consortium blockchain allows secure sharing of patient data between approved parties.
• Cryptocurrency – public blockchain remains the standard choice since decentralisation is the whole point.

Topic for Related Reading: Top 10 Blockchain Applications and Use Cases

Cost Comparison of Types of Blockchains

Public blockchain often costs more to run at scale due to network fees and energy use, especially in proof of work systems. Private blockchains tend to cost less per transaction since fewer nodes are involved, but they require investment in setting up and maintaining the infrastructure. Consortium blockchain costs are shared among members, which can reduce the burden on any single organisation. Hybrid blockchain costs vary depending on how much of the network stays public versus private.

Conclusion

Blockchain is not a single technology with one fixed structure. The types of blockchain, public, private, consortium, and hybrid, each solve a different problem. Public blockchain gives you full transparency and decentralisation. Private blockchain gives you speed and control. Consortium blockchain gives multiple organisations a way to collaborate without losing independence. Hybrid blockchain gives you the flexibility to mix privacy with transparency where it matters most.

There is no single best type. The right choice depends on what you are building, who needs access, and how much control you are willing to share. Once you understand these differences, choosing the right blockchain type for your project or business becomes a much easier decision.

Want personalized guidance on Data Science and upskilling? Speak with an expert for a free 1:1 counselling session today.