Update
Zcash Developer Proposes Fix for Quantum Attack
Zcash developer Zakura has proposed a solution to prevent a future quantum computer from linking users' private Zcash payments. The approach, described in an engineering post by Adam Tucker, does not require a network upgrade. The biggest risk comes from swaps through NEAR Intents, a cross-chain swap service. Each swap out of ZEC writes one of the user's shielded addresses to NEAR's public chain as a refund address, exposing all addresses if broken.