Zcash activates Ironwood upgrade with new shielded pool, moves toward quantum fund recovery

Zcash, a privacy-focused cryptocurrency network that uses zero-knowledge proofs to protect user transaction data, completed its Ironwood upgrade on July 28, 2026, at block 3,428,143. Ironwood introduced a new category of shielded notes designed to enable possible fund recovery in the event that current cryptographic protections become obsolete, particularly in the face of emerging quantum computing threats. With the activation of the Ironwood shielded pool through the NU6.3 upgrade, Zcash opened a transition path for holders wishing to prepare for quantum security risks. The upgrade established stricter controls on the earlier Orchard pool and implemented additional safeguards for transfers. The new note plaintext format uses a marker of 0x03, which replaces the previous orchard standard of 0x02.

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