---
title: "Introducing Credentio: Open Source C++ Library for C2PA Content Credentials from Google"
description: "Google introduces Credentio, an open-source C++ library for local validation of C2PA Content Credentials, initially supporting specification versions 2.2 and 2.4. The library is the code used by nearly 40 conformant C2PA-enabled Google products to process tens of billions of generated images, videos, audio files, and documents across many formats. Its API keeps validation inside the developer’s application, avoiding media transmission while providing immediate verdicts, privacy, and zero bandwidth overhead; it is also designed to maintain a small memory footprint for assets ranging from images to multi-gigabyte videos. Credentio parses manifests, assertions, digital signatures, and claims, accepts official or custom trust lists, and reports verification statuses and integrity errors, while planned work includes generating and embedding Content Credentials."
---

# Introducing Credentio: Open Source C++ Library for C2PA Content Credentials from Google

[Google](https://yomu.fyi/company/google) · Sherif Hanna · Aug 13, 2026

**Type:** Announcement

## Summary

Google introduces Credentio, an open-source C++ library for local validation of C2PA Content Credentials, initially supporting specification versions 2.2 and 2.4. The library is the code used by nearly 40 conformant C2PA-enabled Google products to process tens of billions of generated images, videos, audio files, and documents across many formats. Its API keeps validation inside the developer’s application, avoiding media transmission while providing immediate verdicts, privacy, and zero bandwidth overhead; it is also designed to maintain a small memory footprint for assets ranging from images to multi-gigabyte videos. Credentio parses manifests, assertions, digital signatures, and claims, accepts official or custom trust lists, and reports verification statuses and integrity errors, while planned work includes generating and embedding Content Credentials.

## Context

AI transparency regulations and media provenance standards are emerging globally, making content provenance an important requirement for modern media applications. Validating large digital assets also creates computational and resource challenges for traditional libraries.

## Approach / What changed

Credentio provides a local C++ API for validating C2PA Content Credentials without transmitting media to external endpoints. It supports configurable trust lists, parses manifests, assertions, signatures, and claims, produces detailed verdicts, and is designed for a small memory footprint across large files.

## Takeaways

- Credentio initially supports C2PA specification versions 2.2 and 2.4 and has powered nearly 40 conformant C2PA-enabled Google products.
- Local validation avoids external media transmission, reducing bandwidth use and latency while keeping media contents within the developer’s environment.
- The library accepts official or custom C2PA trust lists and reports verification statuses and potential integrity errors; generation and embedding capabilities are planned.

**Tags:** [Open Source](https://yomu.fyi/topic/open-source), [Security](https://yomu.fyi/topic/security)

- Source: [Google](https://developers.googleblog.com/introducing-credentio-open-source-c-library-for-c2pa-content-credentials-from-google)
- Source URL: https://developers.googleblog.com/introducing-credentio-open-source-c-library-for-c2pa-content-credentials-from-google
- Ingested by Yomu: 2026-09-09T14:27:39.563Z

[Read original post](https://developers.googleblog.com/introducing-credentio-open-source-c-library-for-c2pa-content-credentials-from-google)