Zcash Ironwood upgrade: What’s changed after the Orchard bug?

Zcash has completed its Ironwood network upgrade, replacing its vulnerable Orchard shielded pool with a formally verified alternative designed to prevent undetectable counterfeiting while beginning the migration of shielded funds into the new pool. Summary Zcash has activated the Ironwood upgrade and replaced Orchard with a new formally verified shielded pool. Ironwood adds new supply safeguards while Orchard now supports only fund withdrawals. Researchers completed a machine checked proof confirming Ironwood cannot create undetectable counterfeit ZEC under its design assumptions. More than 40,000 ZEC have already moved to Ironwood while about 3.6 million ZEC remain in Orchard. According to Project Tachyon and the Zcash development team, Ironwood activated as scheduled at block height 3,428,143 through the NU6.3 network upgrade on Tuesday, introducing a new shielded pool that developers say restores confidence in Zcash’s supply integrity after concerns surrounding Orchard. Zcash's biggest network upgrade in years is now liveIronwood brings:– A new Ironwood shielded pool– Stronger security guarantees for shielded transactions– Independently verifiable supply integrity– Privacy remai...