Ironwood and Supply Verifiability: Zcash’s Moment
The activation of Ironwood (NU6.3) at block height 3,428,143 on July 28, 2026, is not a routine update. Nor is it, strictly speaking, a security patch, given that the emergency fix NU6.2 already fulfilled that function on June 3. Ironwood is the response to a problem of a different nature: the impossibility of certifying that the patch worked.
zcashd will reach its end-of-life service halt on July 18, as scheduled, completing the Zcash ecosystem's migration to Rust-based, next-generation Zcash client software. zcashd will not support NU6.3 (Ironwood).
Node operators will need to complete their transition to Zebra and…
- Zcash Open Development Lab (@zodl_co) July 10, 2026
The crypto sector has normalized the dichotomy between transparency and privacy. Zcash, by prioritizing privacy through zero-knowledge proofs, faces a structural tension: transaction privacy precludes retrospective supply auditing.
Researcher Taylor Hornby, from Shielded Labs, identified in May 2026 a vulnerability in the Orchard circuit that, theoretically, allowed the creation of counterfeit ZEC without leaving an on-chain record. The vulnerability had been active since Orchard’s launch in May 2022.
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