Tezos developers have launched TzEL, a quantum-resistant privacy payment prototype, on the testnet. TzEL employs post-quantum cryptography and zk-STARK proofs to protect against potential "harvest now, decrypt later" attacks, ensuring the security of transaction data and encrypted payment metadata. The prototype integrates with Tezos’ data availability layer to accommodate the larger size of post-quantum proofs, which are approximately 300 KB according to the whitepaper. Currently, TzEL is operational on the Tezos testnet, marking an early step in the ecosystem's transition to post-quantum cryptography.