verifier-web

Web-Based Light Client Verification

This folder contains a simple example web application demonstrating Tendermint Light Client verification.

Requirements

• Rust stable latest
• NodeJS (tested with v14.15.5)
• wasm-pack

Try it out

You first need to build a few things before you can try this example out locally.

Step 1: Building the WASM binary

From the light-client-js folder:

wasm-pack build

This will build our WASM binary and JavaScript/TypeScript wrappers and place them into a pkg directory.

Step 2: Build/run the example

From this directory (light-client-js/examples/verifier-web):

# Install all dependencies
npm install

# Build/start the example app
npm run start

This should build the example and start a server at http://localhost:8080

Step 3: Input your data

When you open up at http://localhost:8080, you should see something like the following:

Copy/paste the JSON representation of a trusted block alongside that of the untrusted block you wish to verify into the supplied editors. Configure your desired Light Client parameters, as well as the timestamp at which you want to check whether the untrusted block is trustworthy, and click the Verify button.

This will show you the raw JSON object received back from the verifier.

Limitations

1. This example only demonstrates verification, and is pretty manual right now (you must manually copy/paste the JSON representations of untrusted and trusted blocks, and supply options/timestamps manually). No network I/O happens here, so bring your own I/O to fetch light blocks.
2. The WASM binary built in step 1 only works for bundled web applications (e.g. using webpack).