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Content Credentials C2PA Technical Specification 2.2
webThis specification is the authoritative technical standard for Content Credentials, directly relevant to AI safety discussions around synthetic media provenance, disinformation, and deployment-time transparency mechanisms for AI-generated content.
Metadata
Importance: 62/100standardreference
Summary
The Coalition for Content Provenance and Authenticity (C2PA) Technical Specification 2.2 defines an open standard for embedding cryptographically signed provenance metadata into digital media files. It enables verification of content origin, editing history, and AI-generation status, creating a technical foundation for authenticating whether content is human-created, AI-assisted, or AI-generated. This standard is increasingly relevant for combating deepfakes and synthetic media disinformation.
Key Points
- •Defines a cryptographic manifest format for attaching tamper-evident provenance records (Content Credentials) to images, video, audio, and documents.
- •Supports disclosure of AI involvement in content creation, including whether generative AI tools were used to produce or alter media.
- •Enables a chain of custody: each edit or transformation can be recorded and verified, providing an auditable history of a media asset.
- •Specifies binding mechanisms so credentials cannot be trivially stripped or transferred to different content without detection.
- •Backed by major industry players (Adobe, Microsoft, Sony, etc.) and positions as an industry standard for media authentication infrastructure.
Cited by 1 page
| Page | Type | Quality |
|---|---|---|
| AI Content Authentication | Approach | 58.0 |
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# o. Coalition for Content Provenance and Authenticity
# Content Credentials C2PA Technical Specification
2.2, 2025-05-01:
# Table of Contents
1. Introduction. 2
1.1. Overview. 2
1.2. Scope.. 2
1.3. Technical Overview 3
2. Glossary. 6
2.1. Introductory terms.. .6
2.2. Assets and Content 6
2.3. Core Aspects of C2PA.. 8
2.4. Additional Terms .9
2.5. Overview. 10
. Normative References. 12
3.1. Core Formats. 12
3.2. Schemas. 12
Digital & Electronic Signatures 12
3.4. Embeddable Formats 13
3.5. Other. 13
3. Standard Terms 15
4. Versioning. .16
5.1. Compatibility.. .16
5.2. Version History .16
5. Assertions.. 23
6.1. General. 23
6.2. Labels . 23
6.3. Versioning .24
6.4. Multiple Instances 24
6.5. Schema Validation 25
6.6. Assertion Store .25
.7Embedded vs Externally-Stored Data 25
6.8. Redaction of Assertions 25
Specifications of time in assertions .26
6. Data Boxes . 27
7.1. General. .27
. Schema and Example 27
7. Unique Identifiers. 28
8.1. Uniquely Identifying C2PA Manifests and Assets 28
8.2. Versioning Manifests Due to Conflicts. 29
8.3. Identifying Non-C2PA Assets ..29
8.4. URI References 30
9\. Binding to Content. .34
9.1. Overview... ..34
9.2. Hard Bindings. ..34
9.3. Soft Bindings. 35
10\. Claims . ..36
10.1. Overview ..36
10.2. Syntax.. .36
10.3. Creating a Claim. .39
Multiple Step Procssing 44
11\. Manifests . .47
11.1. Use of JUMBF .47
11.2. Types of Manifests . .53
11.3. Embedding manifests into various file formats .55
11.4. External Manifests .55
11.5. Embedding a Reference to an external Manifest .56
12\. Entity Diagram .57
1. Cryptography... .. 58
13.1. Hashing ... 58
13.2. Digital Signatures. 59
2. Trust Model . .63
14.1. Overview .63
14.2. Identity of Signers .63
14.3. Validation states. .64
14.4. Trust Lists. .65
14.5. X.509 Certificates ..66
3. Validation .. .73
15.1. Validation Process 73
15.2. Returning Validation Results. .74
15.3. Displaying Manifest Information ... 83
15.4. Determining the hashing algorithm. .83
15.5. Locating the Active Manifest ..84
15.6. Locating and Validating the Claim. ..86
15.7. Validate the Signature ..86
15.8. Validate the Time-Stamp 87
15.9. Validate the Credential Revocation Information 90
15.12. Validate the Asset's Content 103
6\. User Experience 111
16.1. Approach. 111
16.2. Principles. 111
16.3. Disclosure Levels 111
16.4. Public Review, Feedback and Evolution. .112
7\. Information security 113
17.1. Threats and Security Considerations 113
17.2. Harms, Misuse, and Abuse. 114
. C2PA Standard Assertions .116
18.1. Introduction .116
18.2. Regions of Interest .116
18.3. Metadata About Assertions 124
18.4. Standard C2PA Assertion Summary .129
18.5. Data Hash. .130
18.6. BMFF-Based Hash 133
18.7. General Box Hash. .146
18.8. Collection Data Hash. .155
18.9. Multi-Asset Hash. .158
18.10. Soft B
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