Navio BLS Confidential Transaction Library

TypeScript bindings for the libblsct library used by the Navio blockchain to construct confidential transactions based on the BLS12-381 curve.

Features

• Node.js: Native C++ bindings for maximum performance
• Browser: WebAssembly (WASM) module for browser compatibility

Requirements

Node.js

• Node.js v18 or higher
• g++, make, swig, autoconf, automake, libtool and pkg-config to build underlying C++ libraries

Browser

• Modern browser with WebAssembly support
• No native dependencies required

Installation

npm install navio-blsct

The npm package includes:

• Pre-built WASM files for browser/WebAssembly use (no additional build required)
• Source code for Node.js native bindings (automatically built during installation)

For Node.js, installation includes building native C++ libraries from source (may take a few minutes). Browser/WASM usage works immediately without any build step.

Usage

Node.js

import { Scalar, Point, BlsctChain, setChain } from 'navio-blsct';

// Set the network
setChain(BlsctChain.Mainnet);

// Generate a random scalar
const scalar = Scalar.random();
console.log('Random scalar:', scalar.toHex());

// Generate a point from the scalar
const point = Point.fromScalar(scalar);
console.log('Point:', point.toHex());

Browser

For browser usage, import from the /browser subpath and initialize the WASM module first. The WASM files are pre-built and included in the npm package, so no additional build steps are needed:

import { loadBlsctModule, Scalar, Point, BlsctChain, setChain } from 'navio-blsct/browser';

// Initialize WASM module (required before using any functions)
// This loads the pre-built WASM files from the package
await loadBlsctModule();

// Now use the library as normal
setChain(BlsctChain.Mainnet);

const scalar = Scalar.random();
console.log('Random scalar:', scalar.toHex());

Bundler Configuration

If your bundler automatically resolves the browser field in package.json, you may be able to use the standard import:

import { loadBlsctModule, Scalar } from 'navio-blsct';

await loadBlsctModule();
// ...

API Reference

Full API reference and usage examples are available in the documentation.

Building from Source

Note: Building from source is only needed for development or if you want to modify the library. Users installing from npm get pre-built WASM files and don't need to build them.

Node.js (Native)

cd ffi/ts
npm install

Browser (WASM)

Pre-built WASM files are included in the npm package for browser usage. Building from source is only needed if you're developing or modifying the library.

To build WASM files from source, Emscripten must be installed and activated:

cd ffi/ts
npm install --ignore-scripts
npm run build:wasm
npm run build:browser

The WASM build process:

1. Clones the navio-core repository (if not already present)
2. Compiles the C++ source files to WebAssembly using Emscripten
3. Outputs blsct.js and blsct.wasm to the wasm/ directory
4. These files are included when publishing to npm but are gitignored during development

License

MIT