The Standard Objections
Data privacy. This is the big one. Regulated industries, banking, healthcare, insurance, operate under strict rules about who can access customer data. Putting data on a public chain where any node operator can read it feels like a compliance nightmare. GDPR’s right to erasure alone seems incompatible with an immutable public ledger.
Performance. Ethereum’s base layer processes 15 to 30 transactions per second. For a bank processing millions of transactions daily, this is laughable. Even after the merge to proof-of-stake, public chain throughput does not come close to what centralized systems deliver.
Unpredictable costs. Gas fees on Ethereum have ranged from $0.50 to $200 per transaction, depending on network congestion. Try putting that in a procurement contract or a board presentation. CFOs need cost predictability, and public chains do not offer it natively.
Reputational risk. Blockchain still carries crypto baggage. An executive proposing a public chain deployment might face pushback from risk committees that associate it with speculation, money laundering, and FTX-style collapses. Even if the technical proposal is sound, the political battle might not be worth fighting.
Where These Objections Are Weaker Than They Appear
Start with privacy. Nobody is suggesting that enterprises store customer records directly on a public chain. The pattern that works is anchoring, you store the actual data in your own systems and publish a cryptographic hash or proof to the public chain. The public chain provides a tamper-evident timestamp and a verification mechanism without exposing the underlying data. This is exactly how Tierion and OpenTimestamps work for document verification.
Zero-knowledge proofs have matured significantly since 2020. Ernst & Young’s Nightfall protocol enables private transactions on the public Ethereum network. The sender, receiver, and amount are hidden. The public chain verifies that the transaction is valid without knowing its contents. It sounds like magic, but the cryptography is well-established, and multiple enterprises are running it in production.
Performance objections assume you need to run your entire transaction volume through the base layer. You do not. Layer-2 solutions, rollups, state channels, sidechains, process transactions off-chain and periodically settle to the main chain. Polygon processes thousands of transactions per second while inheriting Ethereum’s security for final settlement. Starbucks’ loyalty program runs on Polygon, not because Starbucks is a crypto company, but because the performance and cost profile works for their use case.
Cost predictability is addressed by layer-2 solutions as well. On Polygon or Arbitrum, transaction costs are fractions of a cent. Some enterprise L2 providers offer fixed-rate plans. The wild gas fee swings of 2021 are a base-layer problem that the ecosystem has largely solved at the application layer.
Cases Where Public Chains Actually Make Sense
Cross-industry interoperability. If your blockchain deployment needs to interact with partners, customers, or systems outside your consortium, a public chain provides a neutral meeting ground. Nobody has to join your private network. Nobody has to trust your infrastructure. The public chain serves as a shared settlement layer that all parties can verify independently.
Credential verification. When a university issues a digital diploma, the value comes from anyone being able to verify it, potential employers, other institutions, government agencies. A credential anchored to a public chain is verifiable by the entire world without the verifier needing a membership in the issuing institution’s private network. The World Wide Web Consortium’s Verifiable Credentials standard is being built with public chain anchoring in mind.
Tamper evidence for auditors and regulators. Anchoring audit trail hashes to a public chain creates a timestamp that your organization cannot retroactively manipulate. If a regulator needs to verify that records existed in a specific state at a specific time, a hash on a public chain is stronger evidence than a hash stored in your own infrastructure, because you cannot rewrite Ethereum’s history even if you wanted to.
Digital asset settlement. Tokenized securities, carbon credits, and real-world assets increasingly settle on public chains because it enables secondary markets without requiring all potential buyers to join a private network. The European Investment Bank issued a €100 million bond on Ethereum in 2021, not as an experiment, but as a production issuance.
The Risk of Only Going Private
Enterprises that build exclusively on private or consortium chains face a long-term interoperability challenge. Each private network is an island. If your supply chain network runs on Hyperledger Fabric and your trade finance network runs on Corda, integrating them requires custom bridges that are complex and fragile. The public chain ecosystem, for all its messiness, is building toward interoperability standards that private networks are not.
There is also a resilience argument. A private network is only as available as its operators make it. If the consortium’s three largest members decide to shut down their nodes, the network dies. Public chains have survived multiple attempts at shutdown, regulatory crackdowns, and operator failures because no single entity controls them. For critical infrastructure, that resilience has value.
A Pragmatic Position
The mature enterprise position in 2026 is not “public chains bad, private chains good.” It is “use the right chain for the right layer.” Store sensitive data in permissioned systems. Anchor verification hashes and settlement proofs to public chains. Use layer-2 solutions to bridge the performance gap. Let the trust model drive the architecture rather than blanket assumptions about what is and is not enterprise-grade.
The enterprises that will be best positioned are the ones building applications that can operate across both models, not the ones that committed exclusively to one side and painted themselves into a corner.