Types of Blockchains: A Beginner’s Guide
Not all blockchains are designed to work in the same way.
Some are open to anyone, while others restrict who can participate. Some prioritize decentralization, while others are designed for greater control, privacy or organizational use.
Understanding these differences makes it easier to understand why different blockchain networks are built for different purposes.
1. Public Blockchains
A public blockchain is generally open to anyone.
People can typically view the blockchain’s records, submit transactions and, depending on the network, participate in activities such as validating transactions.
Bitcoin and Ethereum are well-known examples.
Why use a public blockchain?
Public networks can provide:
- Greater transparency
- Open participation
- Decentralized operation
- Independent verification of transactions
The trade-off can be lower privacy, network congestion, fees or other scalability challenges depending on the blockchain.
2. Private Blockchains
A private blockchain is controlled by a specific organization or group.
Participation is restricted, meaning the organization can decide who is allowed to access the network or perform particular functions.
Private blockchains may be useful where an organization wants some of the characteristics of blockchain technology while maintaining tighter control over the network.
The trade-off is that they generally provide less decentralization than open public networks.
3. Permissioned Blockchains
A permissioned blockchain restricts certain activities to approved participants.
For example, an organization may allow selected entities to validate transactions while giving other participants more limited access.
Permissioned systems can be useful for business networks where participants are known and access requirements are important.
The exact design can vary significantly between different permissioned networks.
4. Consortium Blockchains
A consortium blockchain is operated by multiple organizations rather than being controlled by a single organization.
Several participating institutions can share responsibility for maintaining the network.
This model can make sense when multiple organizations need a common record but don’t want one company to have complete control.
For example, several businesses in the same industry could potentially use a shared blockchain for coordinating records or transactions.
Public vs Private vs Permissioned
The simplest way to understand the difference is to ask:
Who can participate, who can validate transactions, and who controls the network?
| Type | Access | Control | Typical Focus |
|---|---|---|---|
| Public | Generally open | Distributed | Decentralization & openness |
| Private | Restricted | One organization/group | Control & organizational use |
| Permissioned | Approved participants | Selected entities | Controlled participation |
| Consortium | Selected organizations | Multiple organizations | Shared business networks |
These categories can overlap in practice. A blockchain’s actual design may combine characteristics from more than one category.
Layer 1 Blockchains
You may also hear the term Layer 1.
A Layer 1 is the underlying blockchain network itself. It provides the base infrastructure for recording transactions and running applications.
Examples include Bitcoin and Ethereum.
Layer 1 should not be confused with the public/private distinction above. “Public blockchain” describes access and participation, while “Layer 1” describes where the network sits in a blockchain architecture.
How Do You Choose Between Blockchain Types?
There isn’t one blockchain type that is automatically better than all others.
The right design depends on what the network needs.
A public blockchain may be preferable when open participation and decentralization are important.
A private or permissioned blockchain may make more sense when privacy, controlled access or organizational governance is a priority.
The important question isn’t simply “Which blockchain is best?”
It’s:
“What problem is the blockchain supposed to solve, and what trade-offs are acceptable?”
Why Blockchain Types Matter in Crypto
For crypto users, understanding blockchain types helps explain why different networks behave differently.
Transaction speeds, fees, decentralization, privacy, security and participation rules can vary significantly from one network to another.
It also helps when choosing which network to use for a transaction. Sending an asset through the wrong network can result in delays, additional costs or, in some situations, loss of access to the funds.
Conclusion
Blockchain technology isn’t a single standardized system. Different networks make different choices about access, control, participation, privacy, security and scalability.Public blockchains focus heavily on open participation and decentralization, while private, permissioned and consortium models provide greater control over who can participate.Understanding these differences gives you a much clearer picture of why blockchain networks are built differently—and why no single design is ideal for every use case.
This guide is provided for general educational and informational purposes only. It is not financial, investment, legal or technical advice.