The Cardano Van Rossem hard fork hit its mainnet go/no-go decision point on June 15, 2026 – the most consequential single day in the protocol’s Voltaire governance era, with network readiness metrics running well ahead of any prior upgrade and an official outcome expected imminently.
Put simply, node adoption is strong enough that a green light is plausible, but the decision itself must clear a community-governed process that has never activated a mainnet hard fork before.
This huge decision regarding Cardano’s future comes as ADA dropped by -1% overnight, one of the few digital assets in the red over the past 24 hours, highlighting the uncertainty running throughout the community.
$ADA 5 waves followed by an ABC will remain king
This is the current probability
That is -56% from here (macro speaking ONLY)
But- here's the thing…
ALTS do NOT all move together
If Cardano drops that doesn't mean all coins do
That's a huge misconception on CT
Patience… pic.twitter.com/jmtP71q3LJ
— Norris Digital Assets
(@AssetsNorris) June 15, 2026
What the Van Rossem Hard Fork Actually Does
The Van Rossem hard fork is Cardano’s move to Protocol Version 11, technically an intra-era upgrade, meaning it changes protocol capabilities and governance parameters without launching an entirely new ledger era, the way Shelley or Basho did. Think of it less as rebuilding the engine and more as upgrading the control systems that govern who can touch the engine going forward.
Critically, this is the first hard fork in Cardano’s history initiated through the Voltaire on-chain governance framework rather than by IOG acting unilaterally. Under Voltaire, DReps (Delegated Representatives) hold voting power proportional to the ADA stake delegated to them, and the Constitutional Committee must ratify governance actions before they reach mainnet.
The Van Rossem upgrade also carries an update to the Plutus cost model, the pricing schedule that determines how much computation each smart contract operation costs on-chain. That governance action was submitted on May 26 and is sitting at approximately 55% approval, with ratification expected within weeks, according to Intersect’s June 12 update.
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How Ready Is the Cardano Network Right Now?
The readiness picture heading into June 15 was materially better than at any prior decision window. According to PoolTool, 52% of nodes are self-reporting Protocol Version 11. Cexplorer puts the block-production share higher: 84% of blocks minted over the five days to June 12 came from v11 nodes, and 76% of block production in the current mainnet epoch was running on Protocol Version 11.
Those are not the same metric – node count and block production weight differ because larger, more active stake pools tend to upgrade faster – but both point in the same direction. Exchange readiness was described by Intersect as “improving rapidly.”
Several light wallets have achieved full readiness status, and a CPU overspend issue flagged by the Indigo protocol was traced to an older version of the Lucid library using hardcoded values, not to any flaw in the node or the hard fork itself. No underlying protocol issue was identified.
For teams running infrastructure, two supported compatibility paths exist: the Intersect-maintained forks of Ogmios (v6.14.0.2) and Kupo (v2.11.0.1), both maintained by IOG, remain fully supported while upstream-compatible releases are finalized.
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The Human Story Behind the ‘Van Rossem’ Name
Binance and Coinbase are now both showing Cardano’s Van Rossem hard fork upgrade as In Progress.
This is another clear signal that the wider exchange infrastructure is preparing for the upgrade.
Exchange Readiness Completed is reporting as 20.69%
Exchange Readiness In Progress… pic.twitter.com/T7mKpK8Svi— Dave (@ItsDave_ADA) June 15, 2026
The upgrade carries a name that sets it apart from every prior Cardano hard fork. Max van Rossem was a Cardano governance contributor who passed away on January 11, 2026. His son, Max Louis Hans van Rossem, was born the same day.
The naming was not ceremonial. In January and February 2026, Intersect ran an on-chain DRep naming vote for Protocol Version 11; support exceeded 80% of active DRep stake, making it one of the most decisive governance votes the network has recorded.
As Intersect wrote in its June 12 update: “He will grow up in a world where the blockchain his father helped shape carries his family name, a hard fork named not for a product or a protocol milestone, but for a human being who gave his time, his mind, and his heart to a decentralized future he believed in.”
That vote was itself a proof-of-concept for the Cardano governance system the Van Rossem upgrade is designed to cement – community-mandated decisions replacing founder-driven ones.
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The post Cardano Van Rossem Hard Fork Hits Decision Day appeared first on 99Bitcoins.
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