Tempo’s Zones target enterprise privacy, spark concern

Tempo unveiled Zones on Thursday, a feature that creates permissioned parallel chains attached to its public stablecoin rails. The company says the feature is designed to give enterprises a way to keep sensitive transaction details private while still accessing shared liquidity on Tempo’s main network. Backers include Stripe and Paradigm.

Zones run as separate, permissioned chains that remain interoperable with the public network, other Zones and shared liquidity pools. Each Zone is operated by a designated operator that controls access, can view full transaction data inside the Zone, and can suspend transfers or withdrawals. The public network validates batched state updates and cryptographic proofs from Zones.

Tempo and its backers state the operator model preserves benefits of a public blockchain, such as shared liquidity and auditable settlement, while providing the compliance and record-keeping enterprises expect. The company has argued that approaches relying heavily on advanced cryptography introduce operational complexity and user-experience trade-offs that may deter corporate adoption.

Privacy-focused developers and builders have raised concerns about the design. They say giving a single operator visibility and control reintroduces centralized trust assumptions and weakens self-custody, because an intermediary can restrict a user’s ability to move or withdraw funds under its compliance rules. Critics compare the arrangement to centralized payment systems or exchanges where control is concentrated and access can be restricted.

Other projects are pursuing different technical methods to keep transaction details confidential while anchoring to public networks. These approaches include zero-knowledge proofs that post compact proofs to a public chain, distributed encrypted architectures that keep data encrypted across nodes and reveal only verified outputs, and homomorphic encryption that enables computation on encrypted data without exposing inputs.

Ghazi Ben Amor, senior vice president of business development at Zama, described the cryptographic techniques as ‘indeed extremely complex’ and said Zama hides that complexity from developers so they can write smart contracts in familiar languages. He also noted that, in his view, Tempo’s Zones operate like private blockchains that resemble existing centralized payment systems and face similar scalability constraints.

Tempo did not respond to a request for comment. Enterprises using stablecoin rails have cited needs to protect payroll details, merchant volumes and treasury activity while retaining access to public settlement and liquidity rails.