# Ironwood Resources

Explainers, specifications, and the libraries and node implementations that
ship Ironwood support for Zcash's NU6.3 network upgrade. The Ironwood
overview is at https://zakura.com/ironwood/ (markdown:
https://zakura.com/ironwood.md).

## Learn

- The Ironwood Book: https://zcash.github.io/ironwood/
- Project Tachyon, *Ironwood: Auditing the Orchard Pool's Supply*:
  https://tachyon.z.cash/blog/auditing-orchard-supply/ — published 6 June 2026.
- Project Tachyon, *Detecting Counterfeiting after Zcash's Ironwood*:
  https://tachyon.z.cash/blog/detecting-counterfeiting-in-zcash/ — published 7 July 2026.
- Shielded Labs, *Verifying the Soundness of Zcash's Circulating Supply*:
  https://shieldedlabs.net/ironwood-verifying-the-soundness-of-zcashs-circulating-supply/ — published 6 June 2026.
- ZODL, *Ironwood: A New Shielded Pool*:
  https://zodl.com/ironwood-a-new-shielded-pool-for-zcash/ — published 6 June 2026.

## Specifications

- ZIP 258, deployment of NU6.3:
  https://github.com/zcash/zips/blob/main/zips/zip-0258.md — created 19 June 2026.
- ZIP 229, Version 6 transaction format:
  https://github.com/zcash/zips/blob/main/zips/zip-0229.md — created 13 June 2026.
- ZIP 2005, Ironwood quantum recoverability:
  https://github.com/zcash/zips/blob/main/zips/zip-2005.md — created 31 March 2025.
- ZIP 326, wallet changes for NU6.3:
  https://github.com/zcash/zips/blob/main/zips/zip-0326.md — created 30 June 2026.
- Zcash protocol specification: https://zips.z.cash/protocol/protocol.pdf

## Libraries and implementations

- `orchard`: https://github.com/zcash/orchard — Rust implementation of the
  Orchard protocol and the shared Action circuit used by Orchard and
  Ironwood. NU6.3 tag: `0.15.0`.
- `halo2`: https://github.com/zcash/halo2 — proving-system implementation
  used by Orchard and Ironwood. NU6.3 versions: `halo2_gadgets 0.5.0` and
  `halo2_proofs 0.3.2`.
- `librustzcash`: https://github.com/zcash/librustzcash — protocol, V6
  transaction, key, wallet, scanning, storage, proof, and history crates.
  NU6.3 versions: `zcash_primitives 0.29.0` and `zcash_protocol 0.10.0`.
- Zakura: https://github.com/zakura-core/zakura — full node with Ironwood
  consensus, state, sync, and mempool support. NU6.3 tag: `v1.0.0`.
- Zebra: https://github.com/ZcashFoundation/zebra — the Zcash Foundation's
  node and the upstream base for Zakura. NU6.3 tag: `v6.0.0`.

---

Canonical HTML version: https://zakura.com/ironwood/resources/