Stellar developer meeting featuring Nethermind on the Stellar Private Payment System: live Q&A with cryptographer Antonio Arriba covering privacy architecture, zero-knowledge proof design, compliance rules via association sets, and how SPP compares to other privacy solutions.
Stellar Developers Meeting hosted by Khan (SDF senior developer advocate) featuring Antonio Arriba, cryptographer and Stellar Private Payment System lead engineer at Nethermind. Discussion covers SPP's core design: privacy through zero-knowledge proofs allowing users to transact inside shared pools without revealing transaction details, paired with configurable compliance via association sets (whitelists/blocklists) controlled by pool operators. Key insight: privacy and compliance need not conflict. Users prove identity once during onboarding, then interact privately via ZK proofs. Arriba explained SPP's positioning among existing privacy pool solutions like Tornado Cash, Aztec, and Railgun, emphasizing Stellar's unique approach to privacy-preserving payments.