Test ZecWallet Lite with lightwalletd + Zebra

[conradoplg]

Motivation

We want to make sure that ZecWallet Lite works when connected to a lightwalletd that is connected to a Zebra instance.

Specifications

Designs

You will need a customized ZecWallet Lite to make it connect to your instance of lightwalletd (which should be configured to connect to your Zebra instance)

Related Work

[conradoplg]

It seems to work!

[conradoplg]

Testnet + upstream lightwalletd results:

• Shielded Sapling transactions show up in the wallet, but never become spendable
  • Investigating zecwallet-light-cli code, this seems to be caused by the anchor_height always having the wallet birthday and never increasing. Not sure why.
• When you click a transaction, it shows the wrong TXID (the old SHA256d one, instead of the NU5 TXID)
  • I can also see getrawtransactions queries to Zebra using the wrong TXID (and of course, failing). But somehow the shielded transactions and balance show up correctly
• Transparent transactions / balance do not show up at all (even though my address has a balance)
  • getaddressbalance does not seem to be called, so it seems it computes the balance manually (I do see a getaddresstxids followed by a getrawtransaction which work successfully)
  • This may be expected, since ZecWallet Lite relies on the forked lightwalletd for some functionality, and IIRC some of that is related to transparent transactions

The same happens when using zcashd, so it does not seem to be a Zebra issue.

I posted this and some more details in the ZecWallet Lite repo.

I'll leaving this open in case someone wants to try to reproduce my results, otherwise we can close in a few days.

[conradoplg]

Now that NU5 activated it shouldn't work anymore in mainnet too.

The zingolabs CLI fork should work, and they're working on integrating it in the GUI

[conradoplg]

The wallet was fixed and now works post-NU5!

To test it:

• Run lightwalletd with Zebra. Use the -no-tls-very-insecure flag (i.e. no need to use certificates). You can add --grpc-logging-insecure to see the GRPC calls from the wallet being made.
• Checkout ZecWallet Lite from this branch which hardcodes its lightwallet to localhost. Follow its README to build and run it. In short: install node (I had to use version 16 due to a bug), install yarn, run yarn install, yarn build, then yarn start
• Check if the wallet works

[conradoplg]

Done and reproduced succesfully by @upbqdn