Deep Dive
1. NU6.1 Testnet Activation (1 August 2025)
Overview: Finalized code for Network Upgrade 6.1 (NU6.1) on testnet, targeting height 3,536,500. This includes ZIP deployments and backward-compatibility safeguards.
The upgrade introduces new consensus rules for enhanced privacy and scalability. Testnet validators must upgrade to avoid forks, though mainnet activation remains pending. The release warns of potential backward-incompatible changes during testing, with possible rollbacks to v6.10.0 if needed.
What this means: This is bullish for ZEC because it signals ongoing protocol innovation, but node operators must stay alert for updates to avoid disruptions. (Source)
2. Zcashd Deprecation (v6.2.0)
Overview: Announced zcashd’s retirement in 2025, urging users to migrate to Zebra (full node) and Zallet (wallet).
Key RPC methods like createrawtransaction
and signrawtransaction
are now deprecated. Ubuntu 20.04 support was dropped due to GitHub CI limitations. Users must explicitly acknowledge the deprecation via config file (i-am-aware-zcashd-will-be-replaced-by-zebrad-and-zallet-in-2025=1
).
What this means: Neutral for ZEC long-term – while modernization improves sustainability, developers and miners face migration complexity. (Source)
3. Orchard Bug Fix (v6.3.0)
Overview: Fixed a critical bug where unshielding Orchard notes misreported balances in transparent wallet APIs like getbalance
.
This resolved discrepancies in fee calculations and transaction trust scoring. Similar issues with Sprout/Sapling were patched earlier in v4.5.1.
What this means: Bullish for ZEC because it enhances wallet accuracy, reducing user errors in shielded transactions. (Source)
Conclusion
Zcash’s updates prioritize protocol resilience (NU6.1), ecosystem modernization (Zebra migration), and UX reliability (Orchard fix). With zcashd sunsetting in 2025, how smoothly will miners and developers transition to Zebra’s Rust-based infrastructure?