What happened
The Chang hard fork went live on Cardano's Preview network on Thursday, beginning the formal tracking phase for stake pool operator adoption ahead of any mainnet schedule, according to CryptoNews. Preview is the public-facing testnet that mirrors mainnet conditions most closely, which makes the SPO count published from this network the reference point analysts and developers will quote in the coming weeks.
The 80% threshold is not a soft target. Cardano's hard fork combinator requires that share of block-producing stake to signal readiness before the upgrade activates on the production chain, the same mechanism used during the Vasil upgrade in 2022 and Alonzo in 2021. Until that bar is cleared, mainnet stays on the current era.
Input Output Global, the engineering firm building Cardano alongside the Cardano Foundation and Emurgo, has been running Chang's components on internal and SanchoNet environments for months. Preview is the last public stop before mainnet.
Why it matters
Chang is the upgrade that turns Cardano into a self-governing chain. It implements CIP-1694, the proposal that introduces a constitutional committee, delegated representatives known as DReps, and on-chain treasury voting funded by the protocol's roughly 1. 6 billion ADA reserve.
After Chang, ADA holders, not IOG, decide protocol parameter changes and treasury spend. That's a structural shift, and one rivals like Polkadot and Tezos have used as a marketing line for years. The 80% SPO gate matters because it is the cleanest public timeline anyone has.