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Jul 27, 2026

Zcash activates Ironwood upgrade, sealing potentially compromised pool

Zcash activated its Ironwood network upgrade at block height 3,428,143 on July 28, replacing the Orchard shielded pool with a new private pool. The upgrade prevents any potentially counterfeit coins from leaving the retired pool, which held about 3.66 million ZEC.

Jul 27, 2026·5 sources
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Top claims

  • ▪The flaw, which existed since the Orchard pool's launch in 2022, would have left no on-chain trace if exploited.
  • ▪The upgrade was proposed by Zcash founder Zooko Wilcox as a definitive repair for the counterfeiting vulnerability.
  • ▪Privacy provider Nym warned that migrating funds without tools like Tor could expose a user's IP address and wallet balance.

Topics

CryptocurrenciesPrivacy coins

Related entities

ZECBlockchain Security

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