# ZSAs in NU7, H2 2025 Extension **URL:** \ **Category:** Applications\ **Created:** [May 21, 2025, 1:03pm UTC](https://forum.zcashcommunity.com/t/zsas-in-nu7-h2-2025-extension/51298 "2025-05-21T13:03:35Z")\ **Posts on this page:** 1\ **Showing post:** 10
**Author:** ![vivek](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/vivek/32/19682_2.png) [@vivek](https://forum.zcashcommunity.com/u/vivek)\ **Post date:** [October 9, 2025, 12:38pm UTC](https://forum.zcashcommunity.com/t/zsas-in-nu7-h2-2025-extension/51298/10 "2025-10-09T12:38:21Z")
Dear Zcash community, We’d like to share with you here our update on what we have been working on in the last few weeks. ## ZIPs - We have actively been working with the ZIP Editors to stabilize the specification of the ZSA ZIPs. - We helped merge [PR#1077](https://github.com/zcash/zips/pull/1077) to help complete the updates to the SIGHASH versioning, and also opened [PR#1086](https://github.com/zcash/zips/pull/1086) and [PR#1088](https://github.com/zcash/zips/pull/1088) for some follow on rearrangements that were necessary as a result. All these changes have been merged. ## The `halo2` crate and `sinsemilla` crate - Our work to add in ZSA support was merged by the ECC last month, there have been no further changes needed. ## Changes to the `orchard` crate - We completed the changes to the encoding of the issuance authorization signature and issuance validating key ([PR#182](https://github.com/QED-it/orchard/pull/182), [PR#184](https://github.com/QED-it/orchard/pull/184)). - The additions to the `orchard` crate to implement the ZIP changes for SIGHASH versioning (mentioned above) were also implemented ([PR#181](https://github.com/QED-it/orchard/pull/181)). - Based on discussion with the ECC, we refactored some of the above implementation ([PR#192](https://github.com/QED-it/orchard/pull/192)). - We also implemented the follow on ZIP changes that were mentioned above ([PR#189](https://github.com/QED-it/orchard/pull/189), [PR#193](https://github.com/QED-it/orchard/pull/193)). - We also have been keeping up to date with upstream, and ensuring that our upstream pull request ([PR#471](https://github.com/zcash/orchard/pull/471)) is consistently ready for review, even with the ZIP changes. We look forward to the review and discussion of this major chunk of the ZSA implementation. ## Changes to the `librustzcash` crate - Just as in `orchard`, we will be implementing the latest changes that have been made in the ZIPs, namely the `ik` and `issueAuthSig` encoding, the support for SIGHASH versioning, and all the follow-on changes ([PR#129](https://github.com/QED-it/librustzcash/pull/129), [PR#142](https://github.com/QED-it/librustzcash/pull/142), [PR#146](https://github.com/QED-it/librustzcash/pull/146)). - We had to also make a change to the serialization of the issue note description that had been made in a previous ZIP editor change but only recently noticed by us ([PR#141](https://github.com/QED-it/librustzcash/pull/141)). - We also merged the changes from upstream into our work, so that our upstream [PR#1931](https://github.com/zcash/librustzcash/pull/1931) remains ready for review and discussion whenever ECC begins looking at it. - We are also in the process of adding the sighash versioning to the Sapling serialization ([PR#149](https://github.com/QED-it/librustzcash/pull/149)). - The addition of the Fee Rule updates for ZSAs in ZIP 317 are also in the process of being implemented ([PR#148](https://github.com/QED-it/librustzcash/pull/148)). ## The Python reference implementation - The ZIP changes also necessitate an update to the Python reference implementation and the test vectors they generate. This is also complete ([PR#31](https://github.com/QED-it/zcash-test-vectors/pull/31), [PR#32](https://github.com/QED-it/zcash-test-vectors/pull/32), [PR#36](https://github.com/QED-it/zcash-test-vectors/pull/36), [PR#37](https://github.com/QED-it/zcash-test-vectors/pull/37), [PR#38](https://github.com/QED-it/zcash-test-vectors/pull/38)). - We have also prepared the sighash versioning changes for the transparent and sapling code as well ([PR#34](https://github.com/QED-it/zcash-test-vectors/pull/34), [PR#35](https://github.com/QED-it/zcash-test-vectors/pull/35)). ## Zebra - We are continuing to discuss the changes in our pull request ([PR#9560](https://github.com/ZcashFoundation/zebra/pull/9560)) to the upstream repository that covers partial support for ZSAs, via parsing, (de)serialisation and validation of V6 transactions with the Zcash Foundation. - We have continued syncing with Zebra - v2.4.2 ([PR#87](https://github.com/QED-it/zebra/pull/87), [PR#88](https://github.com/QED-it/zebra/pull/88)). - Some API improvements have been prepared for better deployment support such as a jsonrpsee based health-check ([PR#90](https://github.com/QED-it/zebra/pull/90)). - The state management work continues to progress, and we will submit a subsequent PR with those changes post the review of the current PR ([PR Link](https://github.com/QED-it/zebra/pull/29)). We are also adding this functionality to the demo ([PR#89](https://github.com/QED-it/zebra/pull/89)). ## Updates to `zcash_tx_tool` - We have continued improving the CI/CD of the repository, and allowing for automatic pushes of the latest stable Docker images to the ECR. - The Docker images are currently being published to ECR at **[gallery.ecr.aws/j7v0v6n9/tx-tool](https://gallery.ecr.aws/j7v0v6n9/tx-tool)** - We have been preparing support for the state management support work in Zebra to the transaction tool to be able to provide a complete demo ([PR#42](https://github.com/QED-it/zcash_tx_tool/pull/42)). ## PRs ready for review - The `orchard` crate changes for ZSA are in [PR#471](https://github.com/zcash/orchard/pull/471). - The `librustzcash` crate changes for ZSA are in [PR#1931](https://github.com/zcash/librustzcash/pull/1931). - The initial ZSA changes for zebra are in [PR#9560](https://github.com/ZcashFoundation/zebra/pull/9560). Best, The QEDIT Team. --- _[View the full topic](https://forum.zcashcommunity.com/t/zsas-in-nu7-h2-2025-extension/51298)._