Manna Wallet has integrated Branta Guardrails, an open-source protocol that verifies merchant identities during Bitcoin payments while preserving user privacy. The integration addresses a core friction point in self-custodial Bitcoin adoption: users lack clear confirmation that they send funds to legitimate merchants rather than phishing addresses.
Branta Guardrails uses zero-knowledge proofs to authenticate merchant connections without exposing sensitive data. The system verifies that a payment recipient controls a specific domain or merchant identity, then cryptographically proves this fact to the wallet. Users see verified merchant details at payment time, reducing the attack surface for address-spoofing scams that plague self-custody workflows.
The protocol launches live on Manna Wallet and integrates with BTCPay Server, the open-source payment processor widely deployed by merchants and enterprises. This compatibility matters. BTCPay powers thousands of Bitcoin merchants globally, creating immediate distribution for Branta's verification layer.
The zero-knowledge architecture proves critical here. Traditional certificate-based systems require third-party intermediaries, introducing censorship and surveillance vectors. Branta uses cryptographic commitments and proofs instead. Merchants commit to their identity on-chain or via signed messages. Wallets verify these commitments locally, then display merchant names to users. No central authority controls the system.
Self-custodial Bitcoin payment flows have struggled with usability and safety in practice. Users must manually verify addresses through external channels or trust copy-paste accuracy. Social engineering remains trivial. Branta addresses this without reintroducing centralized trust, fitting Bitcoin's design philosophy.
The open-source release suggests broader ecosystem adoption. BTCPay Server users can begin issuing Branta-compatible merchant proofs immediately. Hardware wallet makers and other payment apps can implement verification without licensing friction or dependency on a single company.
Merchant verification does not solve all security problems, but it closes one critical gap. Combined with proper address validation and user education, Branta Guardrails moves self-custodial payments closer to practical safety standards that match custodial services