feat(wasm-utxo): add ZEC NU6.2 consensus branch id#288
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Zcash NU6.2 hard fork (mainnet block 3364600) introduced a new consensus branch id 0x5437f330, re-enabling Orchard after the GHSA-ghc3-g8w4-whf9 emergency soft fork. Without it, ZEC transactions built for heights >= 3364600 carry the stale NU6.1 branch id and are rejected by upgraded nodes. The pinned zebra-chain 7.0 does not yet expose NU6.2, so the value is hardcoded (matching ZcashFoundation/zebra main) and excluded from the zebra parity tests, guarded instead by test_nu6_2_constants until the dependency is bumped (7.0 -> 9.0). Refs: T1-3519 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
davidkaplanbitgo
approved these changes
Jun 3, 2026
lcovar
approved these changes
Jun 3, 2026
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What
Adds the NU6.2 Zcash network upgrade to
wasm-utxoso transactions built for heights ≥ 3,364,600 carry the correct consensus branch ID.src/zcash/mod.rs: newNetworkUpgrade::Nu6_2(branch id0x5437f330, mainnet3364600, testnet4052000), added toALL+params().branch_id_for_heightresolves it automatically.Why
Zcash activated the NU6.2 hard fork at mainnet block 3,364,600 (≈00:05 EDT 2026-06-03) with a new consensus branch ID
0x5437f330, re-enabling Orchard with a corrected circuit after the GHSA-ghc3-g8w4-whf9 emergency soft fork. The builder previously topped out at NU6.1 (0x4dec4df0); any ZEC tx built at/after the activation height was signed for the stale branch and rejected by upgraded nodes.Parity-test decoupling (temporary)
The pinned
zebra-chain7.0 does not yet expose NU6.2, so:to_zebra_upgradenow returnsOptionand returnsNonefor NU6.2; the fourparity_with_zebra_chaintests skip it.test_nu6_2_constantsguards the hardcoded values + the activation boundary (3364599 → NU6.1, 3364600 → NU6.2).Follow-up: bump
zebra-chain7.0 → 9.0 and re-couple NU6.2 to the parity tests (remove the skip + the standalone guard).Test
cargo test --lib zcash::→ 26 passed, 0 failed (incl. new test + parity tests).cargo fmt --check+cargo clippyclean.Notes
utxo-corepath, currently shadow-only for ZEC signing. The authoritative withdrawal fix is the parallel@bitgo/utxo-lib(TS) change — also tracked under T1-3519.Refs: T1-3519