Official Shielded Support for Zcash In Ledger HW Wallet

ainhoa-zondax · April 5, 2024, 8:34pm

Thank you @ZcashRabbi we are trying to make sure that the new app is available for as many devices as possible. At the moment we’re facing issues with NanoX.

We are trying to finalice this as soon as possible, we’re eager to have this app released. We’re collaborating with several wallets to help them integrate this app and have provided an initial documentation to help on the integration. Here we have published a wallet integration guide.

ainhoa-zondax · April 5, 2024, 8:40pm

We have also worked on the Ledger app for Namada. An initial version is already available on Ledger Live. However we’re still working on an upgrade that will implement MASP (Multi Asset Shielded Pool),

tm3k · April 6, 2024, 1:04am

Cool.

When I was reading this I was under the impression the airdrop was only available to coins in the shielded pool.

github.com

anoma/namada-shielded-airdrop/blob/main/PROTOCOL.md

# A protocol to Air-drop shielded Namada native token to Zcash Shielded Assets holders

### Recap of the shielded-airdrop goal

Both Zcash and Namada are chains that allow shielded transactions using a shielded pool. Zcash comes with multiple pools, that differ in technical implementation but share the same privacy goal. Namada comes with a pool (called Multi Asset Shielded Pool, or MASP in short) which, in a nutshell, generalizes Zcash's pool design allowing assets of different nature to coexist and be transferred within the same pool. 
Here I am going to introduce a protocol that targets those who have a wallet with a shielded Sapling address holding shielded zcash assets. The invitation for them is to open a Namada wallet: so that following a few steps, they can end up with an airdrop reward in Namada native token (NAM) directly in their Namada shielded address.
The protocol design guarantees that the amount of assets held in shielded zcash, and amount of the reward claimed _remain shielded_ during the entire process: what was shielded never gets revealed. 
The only additional requirement for the actor holding shielded ZEC, is that assets has to be in their wallet prior to a fixed moment in time, which we refer to as the snapshot block height. 
The airdrop protocol gives a reward linear in the amount of ZEC that gets involved in the process. So the more ZEC gets used, the higher the NAM reward.
The protocol design envisions a collaboration with Zcash wallets which support a "claim shielded NAM" feature. Users would insert their Namada Shielded Address in to the Zcash wallet extension together with information about the ZEC they want to use for the airdrop, and this would allow them to claim the airdrop reward from their Namada wallet. This approach reduces the trust requirements that Zcash user have towards the Namada developed airdrop tool, as they would not have to input their secret keys in a new tool; keeping the protocol compliant to principles of least authority.

It should be noted that even if the transaction that gives the airdrop reward is shielded, it still will be possible to differentiate it from other shielded transactions going around the pool. This has the positive side effect to easily allow us (airdrop designers) to put a time limit for claiming the airdrop.

## Transaction between Zcash Sapling and Namada MASP
The MASP has a built-in feature that allows a burn-and-mint like process to convert a shielded asset of a given type, to an asset of different type. This is achieved using a _Convert description_ that through a fixed (as in: decided by the governance of the Namada chain) convert ratio, effectively transforms MASP notes into new ones of different type. We can use the same design for a shielded airdrop between Zcash and Namada: transforming a zcash note into a MASP one. This transformation is possible since MASP notes can be interpreted as a generalization of Sapling note, or equivalently a Sapling note can be interpreted as a MASP note of fixed type.
### Set up
The MASP is implemented as a Validity Predicate in Namada, and as a consequence it has its own Namada address. To set up the protocol, we store within the MASP address and the zcash wallet the Sapling commitment tree at the snapshot block height as well as the related nullifier set at that moment. We should distinguish which notes in the commitment tree have been nullified; we can do this dynamically as ZEC are used to claim NAM. We assume having in the MASP address and the Zcash wallet:
* $\mathsf{NoteCommit^{Sapling}}$: the note commitment tree. We refer to the root $\mathsf{rt^{Sapling}}$ of this commitment tree as the _anchor_.
* $\mathsf{nf^{Sapling}}$: the nullifier set  associated with $\mathsf{NoteCommit^{Sapling}}$ at that height.

This file has been truncated. show original

Tsupportisharmful · April 12, 2024, 9:51pm

This is wonderful news. Thank you for adding shielded support!

In my opinion, it was a big mistake to ever direct Zcash users to use hardware wallets before shielded support was ready.

zkcroc · May 14, 2024, 1:43am

@ainhoa-zondax Hi any updates on the progress of this?

ywalletfan · May 19, 2024, 4:00pm

@ainhoa-zondax update? Also, when Orchard support, since the app supports only Sapling pool?

ainhoa-zondax · May 23, 2024, 4:07pm

Hi @zkcroc @ywalletfan, I’d like to share an update with you and the rest of the community.

First and foremost, we are still actively working on the application and are committed to overcoming any obstacles that arise as we move towards the public release. We were in the final stages of release, but during our internal functional review, we identified a few issues that have since been addressed.

During this time we have also simplified the JS library to streamline the integration process. While helping other teams to integrate with the app we realised that the codebase is difficult to maintain. This lead us to conversations with the ECC to provide a migration path for users relying on this library. This will facilitate integration with wallets, such as Zashi. While we plan to ship the initial app with ZEC wallet support we expect to facilitate the path to other wallets.

Due to recent changes in the app, we will need to conduct a delta audit. We have already coordinated with the auditors to schedule this.

While the current application does not support Orchard, we would like to address this once the initial app has been released.

I hope I can provide you with a concrete timeline in the next weeks. I’m really sorry for the delay and we keep working hard to getting this released as soon as possible.

zkcroc · May 24, 2024, 11:56am

Hey thanks for keeping us in the loop!

zerodartz · May 24, 2024, 2:24pm

thanks for updates. one day it will release im sure.

Blazin8888 · June 6, 2024, 3:59am

Thank you for the update and your hard work. Getting shielded hardware wallet support is a critical piece that will empower Zcash users. Once we have this and DEX support (Maya Protocol), it will change everything.

dismad · June 6, 2024, 4:17am

@joshs @zancas What’s the hold up? This release won’t even have UA’s nor Orchard if I’m reading this correctly. Thank you for any insight.

silentZcollector · June 6, 2024, 9:10am

exactly, it’s a shame! and we all should feel ashamed for it!

there are a few grants that always deliver, but besides that everyone is taking it easy and seems to not care as much as they should.

guys, i am waiting for shielded transactions on my ledger for years.

zerodartz · June 6, 2024, 10:35am

funny is ledger and zondax are the ones who have been responsible for the delay

except Hanh, who made it shielded possible by sideloading on Nano S, but they didnt like his Ledger app to integrate into official ledger app

hanh · June 6, 2024, 12:18pm

There are no app on the Ledger Live store.
Using sideloading, everything has been supported for more than a year.

ywalletfan · June 6, 2024, 1:33pm

but sideloading only works with ledger nano s plus, right… not Ledger Nano X and not the brand new Ledger Stax. Also, last time I checked, ledger button to import wallet was not available in the desktop app (has it been readded since?) and the ledger page from https://ywallet.app/ disappeared.

hanh · June 6, 2024, 1:40pm

I removed it because they said they were developing a version for the Ledge Live Store and were going to release it “soon.” The code is still there but disabled.

Sideloading works for NanoS, S+ and Stax.

ainhoa-zondax · June 6, 2024, 3:38pm

We have implemented the app for all existing devices and are committed to this project, working to resolve all obstacles to ensure its official release on the Ledger Live store.

There have been delays, primarily to the difficulties on the integration with wallets and more recently with crashes on Nano X devices.

Currently, we have a functional copy of the ZEC wallet that is compatible with this app, and Ledger is using it for testing. Some delays on their end have been related to the anticipated release of the Stax device, which is now finally being delivered.

We have also collaborated with Zingo to assist with the app integration, though we have no control over their timeline and priorities. Additionally, we have engaged with the Zashi team, who have shown interest in making their app compatible with Ledger in the future.

We have published guidelines to facilitate wallet integration with our app, but we have no control over the timelines of these integrations.

While it’s true that the initial app won’t support UA and Orchard this is something that we would like to support once the initial app is published.

I share your frustration regarding the project’s delays and assure you that our team is taking this very seriously.

zancas · June 10, 2024, 2:41pm

It’s a priority… we’ve had to delay to adapt to the ZIP317/ZIP320 work that was not in our original roadmap. Barring more surprises we’ll be actively working on it soon.

skyl · June 13, 2024, 2:58am

I share your frustration. But, you have to realize that this is because Zcash is very unique, and very difficult to work with compared to all of the transparent ledger, cookie-cutter projects. The magnitude of difference might be likened to riding your bike around the block versus landing a live zebra on mars. So, we should all learn some patience and grace as we work towards enormously difficult goals through uncharted waters in adverse conditions.

zkcroc · June 13, 2024, 11:50am

This has one of the most frustrating let downs for me personally. It has been almost at the finish line several times the last few years but always just out of reach.

Ledger support is a fundamental first step of adoption and self custody for the crypto masses, and has been a major disappointment that it had been such a shamozzle

Im eagerly looking forward to Zondax finally getting the job done