Public, Private, and Permissioned Blockchains: What’s the Difference?
A beginner-friendly guide to understanding the main types of blockchain networks, how they work, and when each one is used.
- 3 min read
- Intermediate
- Gaetano Pilotta
Public, Private, and Permissioned Blockchains: What’s the Difference?
Not all blockchains work in the same way. Some are open to everyone, while others are designed for specific organizations, businesses, or approved participants.
Understanding the difference between public, private, and permissioned blockchains is essential for knowing how blockchain technology is used in the real world.
In this guide, we’ll break down each blockchain type, explain how they work, and compare their benefits, limitations, and most common applications.
In Simple Terms
The main difference is who can access the network, who can validate transactions, and who controls the rules of the blockchain.
What Is a Public Blockchain?
A public blockchain is an open network that anyone can join, use, and inspect. Users can send transactions, view blockchain data, and often participate in network validation.
Public blockchains are usually decentralized, meaning no single company, government, or organization controls the entire system.
Bitcoin and Ethereum are well-known examples of public blockchains. They are designed to be transparent, censorship-resistant, and accessible to users around the world.
Public Blockchain Structure
What Is a Private Blockchain?
A private blockchain is a closed network controlled by a single organization or a limited group of administrators.
Unlike public blockchains, not everyone can join or view the data. Access is restricted, and participants usually need approval before they can use the network.
Private blockchains are often used by companies that want blockchain-like benefits, such as shared records and automation, while keeping data confidential.
Private Networks
Private blockchains prioritize control, privacy, and efficiency, making them useful for internal business systems and enterprise workflows.
What Is a Permissioned Blockchain?
A permissioned blockchain is a network where participants need authorization to perform certain actions, such as validating transactions or accessing specific data.
Permissioned blockchains can be private or partially open. The key idea is that roles and permissions are controlled by predefined rules.
This makes permissioned blockchains popular for industries where trust, compliance, privacy, and accountability are important.
Permissioned Blockchain Flow
How Do These Blockchain Types Compare?
Each blockchain type is designed for a different balance of openness, privacy, decentralization, and control.
Public
Open to anyone, highly transparent, and usually decentralized.
Private
Restricted to approved users and controlled by an organization.
Permissioned
Access and user roles are managed through permissions.
Hybrid
Combines public and private features for flexible use cases.
Best Choice
The right model depends on privacy, speed, trust, and governance needs.
Key Differences Between Blockchain Types
Access
Public networks are open, while private and permissioned networks restrict participation.
Control
Private blockchains usually have centralized governance, while public ones rely more on community consensus.
Transparency
Public blockchains are highly visible, while private systems can limit what users are allowed to see.
Speed
Private and permissioned networks can often process transactions faster because they use fewer validators.
Privacy
Private and permissioned blockchains are better suited for sensitive business or institutional data.
Real-World Applications
Public Finance
Cryptocurrencies, DeFi platforms, and open digital assets.
Enterprise Systems
Internal records, workflow automation, and shared databases.
Supply Chain
Track goods between manufacturers, suppliers, and retailers.
Healthcare
Secure medical records, patient permissions, and data sharing.
Government
Identity systems, registries, public records, and voting tools.
Consortium Networks
Shared systems managed by multiple trusted organizations.
Which Blockchain Type Is Best?
There is no single best blockchain type for every situation. Public blockchains are ideal when openness, transparency, and decentralization are important.
Private blockchains are useful when an organization needs more control over access, performance, and data privacy.
Permissioned blockchains work well when multiple parties need to collaborate, but access must still be managed through roles, rules, and governance.
The best choice depends on the goals of the project, the type of data being handled, and the level of trust required between participants.
Bottom line
Ready to learn more?
Explore our other guides in the Blockchain Technology category.