Zcash Shielded News is a community article format based on the weekly Zcash Ecosystem Digest Newsletter.
Providing insight on current events and informing the community about important news in the Zcash ecosystem.
Check out the best Highlights below!
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💡 Fact of the Week
Zcash's Ironwood mainnet activation height has been set and tagged!
All of the major organizations are committed to activation of NU6.3 at height 3428143, which is approximately July 28th at 8AM EST.
📩 In today’s edition:
🦓 Zebra 6.0.0 Brings Ironwood to Mainnet
• Zebra 6.0.0 is the first stable release supporting the NU6.3 “Ironwood” Mainnet upgrade, adding the new shielded pool, v6 transaction format, security hardening, and stability improvements ahead of activation.
🎥 LiveZEC Brings Private Donations to Live Streaming
• LiveZEC announced an upcoming platform that enables private ZEC donations with real-time OBS alerts, allowing viewers to tip without creating an account, exposing wallet history, or relying on a payment intermediary.
⚠️ zcashd Reaches End of Life on July 18
• The Zcash ecosystem is completing its migration to Rust-based infrastructure as zcashd reaches end of life on July 18. Node operators are encouraged to migrate to Zebra and Zallet before Ironwood activates.
🗳️ ZCG Meeting Minutes – July 6, 2026
• ZCG approved funding for red·bridge, Zaino, Zcash Türkiye, and additional Zebra fuzzing work, while declining several proposals and leaving others under review.
🛡️ Ironwood Formal Verification Targets Undetectable Counterfeiting Risks
• Sean Bowe explained how Ironwood’s formal verification is designed to eliminate undetectable counterfeiting vulnerabilities by mathematically verifying the protocol’s specification before the new shielded pool goes live.
Zebra 6.0.0 Brings Ironwood to Mainnet
The Zcash Foundation released Zebra 6.0.0, the first stable version supporting the NU6.3 “Ironwood” network upgrade on Mainnet. Node operators are encouraged to upgrade before activation, scheduled for July 28.
This release introduces support for the new Ironwood shielded pool and v6 transaction format, while updating RPCs to expose Ironwood data and migrating Zebra to the latest NU6.3 libraries.
Alongside Ironwood support, Zebra 6.0.0 includes a security fix that prevents certain high-cost mempool transactions from consuming excessive verification resources, improving node resilience without affecting consensus or user funds.
The release also fixes several networking and synchronization issues, updates the state database for Ironwood compatibility without requiring a resync, and raises build requirements for developers compiling Zebra from source.
Read more.
LiveZEC Brings Private Donations to Live Streaming
Recently, Michael from Zcash Brazil announced LiveZEC, an upcoming platform that enables private ZEC donations with real-time OBS alerts for livestreams.
The goal is to make tipping simple and privacy-preserving. Viewers will be able to send ZEC in seconds without creating an account, exposing their wallet history, or relying on a payment intermediary.
LiveZEC is expected to launch soon, bringing another real-world use case for Zcash as private, permissionless digital money.
zcashd Reaches End of Life on July 18
The Zcash ecosystem is completing its transition away from zcashd, which will reach its scheduled end-of-life service halt on July 18 and will not support the upcoming NU6.3 (Ironwood) network upgrade.
Node operators are encouraged to complete their migration to Zebra and the ZODL-maintained Zallet wallet before July 18. From that point onward, Zebra will be the only supported node implementation participating in the Zcash peer-to-peer network.
The transition marks the completion of Zcash’s move to a new generation of Rust-based infrastructure.
ZCG Meeting Minutes – July 6, 2026
🟢 Approved
Zcash Türkiye 2026 Q3-4 - 2027 Q1-2-3-4 | $26,400
- Continued funding for the Turkish Zcash community, supporting educational content, community activities, and its transition toward a self-sustaining model.
Batch-vs-Single Verification Equivalence: Continuous Soundness Fuzzing for Zcash Shielded Verification (incl. Ironwood) | $45,000
- Expands continuous fuzz testing for Zebra to verify consistency between batch and single-item shielded verification, including upcoming Ironwood support.
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- Funds the final phase of red·bridge, covering launch activities, legal compliance, continued WebZjs and MetaMask Snap maintenance, and bringing the bridge to production.
zaino - Stability, Performance & Testing | $50,000
- Improves Zaino’s stability, performance, testing, and reorg handling through new data structures and expanded automated testing.
🔴 Declined
Formal Verification of Consensus Arithmetic and Parsing in zebra-chain | $30,000
- Proposed formal verification of Zebra consensus-critical arithmetic using Lean 4. The committee supported the direction but felt the current tooling and scope were too limited.
Zenith Full-node Wallet 2026 | $122,600
- Proposed adding FROST multisig, dynamic fees, and Ironwood support to the Zenith wallet. The committee cited limited adoption and concerns about overall value relative to cost.
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- A non-custodial payment app for university campuses in Kenya. The proposal was declined due to concerns around offline payments and double-spend protection.
Rozo Merchant POS: Fast Zcash Payments for Real-World Merchants | $48,000
- A merchant POS solution using mempool detection for faster payments. The committee raised concerns about settlement risk and merchant adoption.
Zcash Reference Flow Kit v1: Android SDK Smoke Paths | $12,500
- A testing toolkit for the Zcash Android SDK. The committee recommended closer coordination with existing SDK maintainers.
Growing the Turkish Zcash Community | $13,500
- A Turkish-language education initiative. The committee encouraged collaboration with the already funded Zcash Türkiye team instead of creating a parallel effort.
ZK-LoRa: Shielded Micropayments & Privacy Layer | $24,500
- Proposed integrating Zcash into LoRa mesh networks for private micropayments. The committee considered it outside ZCG’s primary scope.
🟡 Under Review
Zcash in the privacy stack — $15,000
- A technical article series exploring how Zcash fits within the broader privacy technology landscape, including FHE, MPC, TEEs, and post-quantum topics.
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- A security assessment proposal covering penetration testing, infrastructure reviews, and security audits across the Zcash ecosystem. The committee requested revisions before making a decision.
Constant-Time Hardening and Explicit Timing Semantics for Zcash Rust Cryptography — $10,000
- A documentation-focused audit to strengthen and clarify constant-time guarantees across Zcash Rust cryptography libraries.
Zcash Indexer Observatory — $4,000
- Funding to maintain a public dashboard monitoring Zaino and lightwalletd endpoints for uptime, latency, synchronization, and overall health.
ZECsy Team in Amsterdam — $30,000
- A proposal to organize Zcash-focused activities during Cypherpunk Week Amsterdam, including privacy-themed walking tours, onboarding events, and community outreach.
Ironwood Formal Verification Targets Undetectable Counterfeiting Risks
Last week, Sean Bowe published a new post explaining how the formal verification effort behind Ironwood is designed to eliminate undetectable counterfeiting vulnerabilities in Zcash’s next shielded pool.
The work follows the recent discovery of a counterfeiting flaw in Orchard. Although the vulnerability was patched and there is no evidence that it was exploited, any past exploitation would be impossible to detect directly. Ironwood therefore starts with a fresh shielded pool, while a turnstile mechanism allows users to migrate funds from Orchard and help demonstrate that no counterfeit ZEC entered circulation.
The key distinction is between bugs in the protocol specification and bugs in its software implementation. According to the post, specification flaws can create undetectable counterfeiting risks, while implementation flaws would leave evidence on-chain that could later be identified by replaying transaction history with corrected software.
Shielded Labs is formally analyzing Ironwood’s mathematical specification to prove that its verifier preserves balance integrity under the protocol’s stated cryptographic assumptions. The effort is being carried out with support from Tal Derei, Gregor Mitscha-Baude of zkSecurity, and Daira-Emma Hopwood of ZODL.
The immediate goal is to establish strong guarantees against the highest-risk class of monetary bugs before Ironwood becomes the active shielded pool. Future work may extend formal verification further into the implementation itself.