Zingolib

This repo provides both a library for zingo-mobile, as well as an included cli application to interact with zcashd via lightwalletd.

Security Vulnerability Disclosure

If you believe you have discovered a security issue, please contact us at:

zingodisclosure@proton.me

Zingo CLI

zingo-cli is a command line lightwalletd-proxy client. To use it, see "compiling from source" below. Releases are currently only provisional, we will update the README as releases come out.

Privacy

• While all the keys and transaction detection happens on the client, the server can learn what blocks contain your shielded transactions.
• The server also learns other metadata about you like your ip address etc...
• Also remember that t-addresses are publicly visible on the blockchain.
• Price information is retrieved from Gemini exchange.

Note Management

Zingo-CLI does automatic note and utxo management, which means it doesn't allow you to manually select which address to send outgoing transactions from. It follows these principles:

• Defaults to sending shielded transactions, even if you're sending to a transparent address
• Can select funds from multiple shielded addresses in the same transaction
• Will automatically shield your sapling funds at the first opportunity
  • When sending an outgoing transaction to a shielded address, Zingo-CLI can decide to use the transaction to additionally shield your sapling funds (i.e., send your sapling funds to your own orchard address in the same transaction)
• Transparent funds are only spent via explicit shield operations

Compiling from source

Pre-requisites

• Rust v1.70 or higher.
  • Run rustup update to get the latest version of Rust if you already have it installed
• Rustfmt
  • Run rustup component add rustfmt to add rustfmt
• Build Tools
  • Please install the build tools for your platform. On Ubuntu sudo apt install build-essential gcc
• Protobuf Compiler
  • Please install the protobuf compiler for your platform. On Ubuntu sudo apt install protobuf-compiler
• OpenSSL Dev
  • Please install development packages of openssl. On Ubuntu sudo apt install libssl-dev

git clone https://github.com/zingolabs/zingolib.git
cd zingolib
cargo build --release --package zingo-cli
./target/release/zingo-cli --data-dir /path/to/data_directory/

This will launch the interactive prompt. Type help to get a list of commands.

Notes:

• If you want to run your own server, please see zingo lightwalletd, and then run ./zingo-cli --server http://127.0.0.1:9067
• The default log file is in ~/.zcash/zingo-wallet.debug.log. A default wallet is stored in ~/.zcash/zingo-wallet.dat
• Currently, the default, hard-coded lightwalletd server is https://mainnet.lightwalletd.com:9067/. To change this, you can modify the DEFAULT_SERVER const in config/src/lib.rs

Running in non-interactive mode:

You can also run zingo-cli in non-interactive mode by passing the command you want to run as an argument. For example, zingo-cli addresses will list all wallet addresses and exit. Run zingo-cli help to see a list of all commands.

Options

Here are some CLI arguments you can pass to zingo-cli. Please run zingo-cli --help for the full list.

• --data-dir: uses the specified path as data directory. This is required when not using the --regtest option.
  • Example: ./zingo-cli --data-dir /path/to/data_directory/ will use the provided directory to store zingo-wallet.dat and logs. If the provided directory does not exist, it will create it.
• --server: Connect to a custom zcash lightwalletd server.
  • Example: ./zingo-cli --data-dir /path/to/data_directory/ --server 127.0.0.1:9067
• --seed: Restore a wallet from a seed phrase. Note that this will fail if there is an existing wallet. Delete (or move) any existing wallet to restore from the 24-word seed phrase
• --birthday: Specify wallet birthday when restoring from seed. This is the earliest block height where the wallet has a transaction.
  • Example: ./zingo-cli --data-dir /path/to/data_directory/ --seed "twenty four words seed phrase" --birthday 1234567
• --recover: Attempt to recover the seed phrase from a corrupted wallet

Regtest

There is an experimental feature flag available with zingo-cli, in which the cli works in regtest mode, by also locally running zcashd and lightwalletd.

For a relatively recent user experience please see: https://free2z.cash/zingo-cli-in-regtest-mode

Please see docs/TEST_REGTEST.md for a detailed explanation.