Zebra 5.0.0 - 2026-06-02
This release activates the NU6.2 network upgrade. NU6.2 re-enables Orchard
actions (temporarily disabled by the 4.5.3 soft fork) using the fixed Orchard
Action circuit, which fixes a critical bug in the Orchard pool. NU6.2
activates at block height 3,364,600 on Mainnet and 4,052,000 on Testnet. We
recommend node operators update before the activation height.
If the activation height has passed and your node followed a fork, you will need
to sync from scratch. If you have a backed-up state before the activation
height, you can sync from that.
Added
- Activate the NU6.2 network upgrade (consensus branch id
0x5437f330) at height 3,364,600
on Mainnet and 4,052,000 on Testnet. NU6.2 re-enables Orchard actions with the fixed
Orchard Action circuit and routes Orchard proofs to a per-circuit verifying key
(InsecurePreNu6_2/FixedPostNu6_2). - Advertise network protocol version 170150 for NU6.2 on Mainnet, Testnet, and Regtest.
Changed
- Set the default Testnet temporary Orchard-disabling soft-fork height to 4,048,500; the
disable window runs until NU6.2 re-enables Orchard actions at height 4,052,000.
Security
- Add a consensus rule that rejects Orchard bundles whose proof has a non-canonical size,
effective from the NU6.2 network upgrade (GHSA-jfw5-j458-pfv6).