The lightwalletd service file is sourced from: Git: https://github.com/zcash/lightwalletd Rev: ad5ecda5fbb5e12799f926b8cd785d54fdd250c8 Closes zcash/librustzcash#585.
The latter is maintained by the Tokio developers, and has easy integration with the `tonic` gRPC library which is actively maintained.