@nettrek/c2pa-hls-bridge

A lightweight integration layer that connects C2PA WebAssembly verification with HLS.js at fragment-level.
It enables real-time validation of signed media segments using C2PA manifests while streaming via HLS.

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Demo: 0.1.0 build

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Features

• ✅ Intercepts fragment loading in HLS.js
• ✅ Extracts raw fragment bytes and validates them via @contentauth/c2pa-web (WASM)
• ✅ Maintains a time-code mapped interval tree for quick C2PA lookups
• ✅ Detects tampering, AI-generated content, missing signatures
• ✅ Exposes a minimal, high-level API (C2paHlsBridge)

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Installation

From npm

npm install @nettrek/c2pa-hls-bridge

Local install (for development)

npm install ../path/to/dist

Build the library (local development)

npm install
npm run build

Usage

Minimal example

import Hls from "hls.js";
import { C2paHlsBridge } from "@nettrek/c2pa-hls-bridge";

const video = document.querySelector("video");
const hls = new Hls();

const bridge = new C2paHlsBridge({ enableTrustListVerification: false }, hls);

hls.on(Hls.Events.MEDIA_ATTACHED, () => {
  hls.loadSource("https://example.com/master.m3u8");
});

hls.attachMedia(video);

video.addEventListener("timeupdate", () => {
  const reader = bridge.getC2PAMetaByTimeCode(video.currentTime);
  if (!reader) return;

  reader.containsSignature();
  reader.isValid();
  reader.containsAIGeneratedContent();
  reader.getValidationErrors();
});

API

C2paHlsBridge

class C2paHlsBridge {
  constructor(config: C2PAConfig, hls: HlsInstance)

  getC2PAMetaByTimeCode(timeCode: number): C2paManifestHelper | null
  getTamperedWithIntervals(): Interval[]
  libReady(): boolean
  dispose(): void
}

• constructor(config: C2PAConfig, hls: HlsInstance) - Creates a new C2paHlsBridge instance for the given HLS.js instance.
• getC2PAMetaByTimeCode(time: number) - Returns a C2paManifestHelper for the active segment at the given playback time. The ManifestHelper exposes methods for validating the segment and retrieving metadata.
• getTamperedWithIntervals() - Returns an array of intervals that have been tampered with.
• libReady() - Returns true if the C2PA WebAssembly library is ready.
• dispose() - Disposes the C2paHlsBridge instance.

C2PAConfig

interface C2PAConfig {
    enableTrustListVerification: boolean;
}

• enableTrustListVerification - Enables or disables trust list verification (requires network access)

C2paManifestHelper

class C2paManifestHelper {
    containsSignature(): boolean
    isValid(): boolean
    containsAIGeneratedContent(): boolean
    getValidationErrors(): ValidationStatus[]
    getManifestMap(): Record<string, Manifest>
    getActiveManifest(): Manifest | null
    getCustomMetadata (identifier: string, manifest?: Manifest): any | null
    getItem (item: C2paFormatedItemType): string | boolean
    toString(): string

• containsSignature() – Returns true if a valid manifest/signature is present.
• isValid() – Indicates whether the manifest passes validation without errors.
• containsAIGeneratedContent() – Detects if any manifest indicates AI-generated content.
• getValidationErrors() – Returns an array of validation errors if present.
• getManifestMap() – Returns the full set of manifests indexed by manifest ID.
• getActiveManifest() – Returns the currently active manifest or null.
• getCustomMetadata(identifier, manifest?) – Retrieves custom assertion data by identifier. If no manifest is provided, the active manifest is used.
• getItem(type: C2paFormatedItemType) – Returns a formatted human-readable value (enum one of C2paFormatedItemType - issuer, date, status).
• toString() – Returns a pretty-printed JSON representation of the full manifest store (recursion-safe)

References

• C2PA Specification
• HLS.js Documentation

Supporters

• This Opensource Repo is being supported by Westdeutscher Rundfunk, CCAV (Competence Center Audio and Video).