The trusted setup was always a weak point. It required a multi‑party ceremony that, if compromised, could generate fake proofs. Halo 2 uses recursive zk‑SNARKs that don’t need a trusted parameter. That’s a major cryptographic advance. I’ve been following the development since 2020, and it’s finally live. The privacy is now trustless. Satoshi would have loved that. If you want to understand the technical significance, this blog post is the best I’ve read.