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Blockchain technology has gained widespread attention in recent years as a way to securely and transparently store data without the need for a centralized authority. When most people think of blockchain, they likely think of public blockchains such as Bitcoin or Ethereum. These blockchains are completely open and anyone can participate in the network without permission.

However, there is another type of blockchain called a permissioned blockchain. In a permissioned blockchain, access to the network is restricted to a specific group of users who have been granted permission to participate. This may include businesses or organizations that want to use blockchain technology for internal purposes without making their data publicly available.

Advantages of Permissioned Blockchains

There are several advantages to using a permissioned blockchain:

• Control: A permissioned blockchain allows the network administrators to have more control over who can participate in the network and what they can do. This can help prevent unauthorized access or unwanted changes to the blockchain.
• Privacy: Because access to the blockchain is restricted, organizations can use a permissioned blockchain to store sensitive data without making it publicly available.
• Scalability: Public blockchains can become congested when there are a lot of users and transactions. Permissioned blockchains can be designed to handle a specific amount of traffic, making them more scalable for certain use cases.

Examples of Permissioned Blockchains

Permissioned blockchains have been used by a number of businesses and organizations for various purposes:

• IBM Blockchain: IBM has developed a permissioned blockchain that is designed to be used by multiple organizations to track supply chain data.
• JP Morgan's Quorum: Quorum is a permissioned blockchain that was developed by JP Morgan and is specifically designed for use in the financial industry.
• Corda: Corda is a permissioned blockchain that was developed by R3 and is designed to be used in the financial industry for tasks such as managing financial contracts.

Conclusion

While public blockchains like Bitcoin and Ethereum have received a lot of attention, permissioned blockchains offer a number of advantages for businesses and organizations that want to use blockchain technology without making their data publicly available. With the ability to control access, maintain privacy, and scale as needed, permissioned blockchains are an attractive option for many use cases.