zcash tachyon upgrade ships quantum recovery next month through zodl. full post-quantum privacy by year end. cardano targeting late 2026 for lattice-based FIPS 203-206 integration at protocol level. these are the only two chains with committed production timelines for quantum resistance. bitcoin core hasn't even started the conversation. ethereum is co-authoring the research papers proving the threat exists but has no migration date. the trade isn't whether quantum computers break ECDSA in 2030 or 2035. the trade is which chains pass institutional risk committee review when the first credible quantum milestone drops and every compliance desk on wall street starts asking questions at once. by then the infrastructure either exists or it doesn't