Hybrid Blockchain Explained: Public Trust, Private

Quick Answer

A hybrid blockchain combines public and private blockchain features, allowing organizations to control access to sensitive information while making selected records publicly verifiable. It can support business processes that need both privacy and transparency, but its suitability depends on data requirements, governance, costs and the level of trust participants are willing to accept.

A hybrid blockchain is a blockchain system that keeps some information or operations restricted while allowing other data or proofs to be publicly accessible. It gives organizations flexibility over who can participate, what they can see and which records can be independently verified, without requiring every transaction detail to be open to everyone.

Major Takeaways

• Hybrid blockchains let organizations restrict sensitive information while publishing selected records for independent verification.

• Public visibility does not automatically make a blockchain more secure or its data more trustworthy.

• Hybrid blockchain use cases include supply chains, regulated records and business processes requiring selective transparency.

• A consortium blockchain describes shared governance, while a hybrid blockchain describes how access and visibility are structured.

What Makes a Chain Hybrid

Caption: Hybrid blockchain illustration

Alt text: Hybrid blockchain connecting public and private networks. 

A hybrid blockchain combines features of both public and private blockchains. A public blockchain will typically allow anyone to read the data and in some cases will allow anyone to submit transactions or validate activity (depending on the rules of the network). A private blockchain will of course restrict participation to approved participants or organizations.

Hybrid systems take this approach and combine it to meet different requirements. A business for instance might choose to keep the customer data private but publish a verification record which would allow an appropriate party to verify that a transaction had in fact taken place.

The design isn't inherently more secure than any other blockchain model. Security is a function of the implementation, the access controls, the consensus mechanism, the governance and how the keys and data are actually managed.

Public Layer, Private Layer

A hybrid network can achieve separation of public and private information via permissions, restricted ledgers and cryptographic proofs.

The private side could contain confidential business records, identity details or transaction information accessible only to the participants. The public side could contain selected transaction references, timestamps, hashes and proofs which would allow others to verify the claims without actually seeing the data.

This is an approach that works for systems that require both permissioned and public access. The problem with publishing a hash or a proof is that it doesn't in any way guarantee the underlying data is correct. It's still entirely dependent on the data itself and the rules that you use to validate it.

The Business Case for the Split

Common hybrid blockchain use cases are supply chain tracking, healthcare data sharing, financial settlement and business identity verification.

For example a supply chain partner could keep their commercial contracts and supplier details private and yet publish the relevant records to show that goods passed through certain checkpoints. A healthcare organization could keep patient records private and yet allow appropriate parties to verify the integrity of the data.

An enterprise blockchain could be set up in this way if different participants are going to have different levels of access. The design should be driven by a clear business requirement rather than the assumption that blockchain is inherently better than a traditional database.

Consortium Versus Hybrid: The Overlap

A consortium blockchain is one which is governed by a group of organizations rather than by a single organization or by an open public community. A hybrid blockchain is one which is a combination of a restricted and a public blockchain.

These concepts can of course overlap. A consortium could run a hybrid network in which the various organizations in the consortium have control of their own private records and certain proofs are made available in the public domain.

The key difference is between governance and access design. One is about who governs the network, the other is about how the network's information and participation is structured.

Costs: Complexity, Governance, Trust Assumptions

Hybrid systems can add a whole additional layer of technical and admin work. You have got to define access rights, manage identity and encryption, manage the public and private pieces and work out how the information flows between them.

Governance can also get complicated when a number of organizations have different views on data access, data corrections, data upgrades or who is ultimately responsible for errors. Public verification in no way removes the requirement to have trust in the data providers or in the people who are in control of the restricted elements.

Before you go down the route of this architecture you need to compare the development and ongoing maintenance costs against those of a conventional database. A database is likely to be the simpler and more practical solution if it's just one organization that has the data and the participants don't require shared verification.

How to Tell If You Actually Need One

Consider a hybrid blockchain if you need to keep certain sensitive information private while still allowing for independent verification by third parties. You need to work out what information is to be kept private, who that information is to be made available to and what it is that you want the outside world to be able to verify.

If all the participants can have access to the same records and a trusted admin is acceptable then a standard database will be sufficient. If on the other hand you need everyone to have open access and the ability to verify the records then a public blockchain may be the more appropriate solution.

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Conclusion

A hybrid blockchain provides a route to achieve both restricted data access and some degree of public verification. It's a model that could be appropriate for an organization that wants both privacy and a degree of shared accountability. It does so at the expense of governance and technical complexity. As always, define the problem first, compare the alternatives and only go down the blockchain route if the benefits of a shared record or shared verification are sufficient to justify the additional cost. To understand how cryptocurrencies are bought and sold on exchanges, explore our guide to what is cryptocurrency spot trading.

FAQs

What is a hybrid blockchain?

A hybrid blockchain combines public and private blockchain features in one system. It allows an organization to restrict sensitive information while making selected records or proofs available for public verification. The exact design varies, so access rules, governance, and security depend on how the network is implemented.

How does a hybrid chain split public and private data?

A hybrid chain uses permissions and technical controls to limit access to confidential records while exposing selected information publicly. Public data may include transaction references or cryptographic proofs rather than the original records. This can support verification without revealing private details, but it does not guarantee that the source data is accurate.

When is a hybrid chain the right choice?

A hybrid chain may suit organizations that need confidential records and independent verification by external parties. Supply chains, regulated recordkeeping, and multi-party business processes can be potential applications. Before adopting one, compare the costs and governance requirements with a conventional database or a fully public or private blockchain.

What are the downsides?

Hybrid blockchains can be harder to design, maintain, and govern than simpler systems. Managing permissions, private data, public verification, and connections between components adds complexity. They also retain trust assumptions around data providers and administrators. A hybrid model does not automatically improve security, reduce costs, or ensure regulatory compliance.

How does it differ from a consortium chain?

A hybrid blockchain combines public and restricted access or visibility, while a consortium blockchain is governed by a group of organizations. The two can overlap: a consortium may operate a hybrid network with private records and publicly verifiable proofs. However, a consortium blockchain can remain entirely permissioned without a public component.