Tezos developers have launched TzEL, a prototype testnet for private blockchain payments designed to withstand future quantum computing threats. Utilizing post-quantum cryptography and zk-STARK proofs, TzEL aims to secure transaction data and encrypted payment metadata against potential "harvest now, decrypt later" attacks. The testnet leverages Tezos's data availability layer to manage the large proof sizes associated with post-quantum cryptography, addressing a key challenge in developing scalable quantum-resistant privacy systems. Currently, TzEL is operational on the Tezos testnet, marking an early step in the ecosystem's transition to post-quantum cryptography.