Stellar's X-Ray upgrade enables zero-knowledge privacy on its network through BN254 elliptic curves and Poseidon hashing, allowing optional privacy layers with compliance tools like confidential tokens and privacy pools to coexist with transparency.
This discussion explores how privacy and openness can coexist in blockchain infrastructure, focusing on Stellar's technical approach. Stellar deployed the X-Ray upgrade in January 2026, introducing cryptographic primitives for zero-knowledge proof verification including BN254 curves and Poseidon hash functions. The conversation covers privacy solutions across the industry: confidential tokens hide amounts while keeping participants visible, privacy pools provide anonymity through fund mixing with compliance screening, and viewing keys enable selective disclosure. The key insight is that privacy works best as an optional, configurable layer on top of a transparent base layer, with compliance tools like association set providers and selective disclosure mechanisms. This architecture allows institutions to meet regulatory requirements while maintaining the openness and network effects that make public blockchains valuable.