Cardano activated its van Rossem hard fork on July 18, moving mainnet to protocol version 11 with new Plutus data structures, built-ins and ledger rules. The upgrade gives developers new ways to reduce smart-contract work, but it is not a blanket fee cut—and Ouroboros Leios remains a separate, later Dijkstra-era upgrade.On July 18, 2026, at 21:44:51 UTC, Cardano enacted the van Rossem hard fork at mainnet slot 192,844,800, moving the blockchain to protocol version 11 while remaining in the Conway...
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