c2pa-warc

Overview

Stores and retrieves C2PA Manifest Stores in WARC 1.1 files (ISO 28500). The manifest is stored as a WARC record of a dedicated c2paprovenance type with Content-Type: application/c2pa, as the last record in the file.

WARC is used by national libraries, legal deposit systems, and digital preservation institutions to archive web content. This crate enables content provenance for archived web resources.

The C2PA Technical Specification defines no WARC embedding method. Unlike HTML, structured text, ZIP, ONNX, or SafeTensors — each of which has a normative clause — WARC embedding is a proposal, and what this crate implements is that proposed shape. It conforms to WARC 1.1 and produces a valid archive readable by any WARC tool; it does not claim C2PA specification conformance, because there is nothing yet to conform to.

Zero dependencies.

Quick Start

[dependencies]
c2pa-warc = "0.1"

Append a manifest

use c2pa_warc::append_manifest;

let warc_data: &[u8] = /* existing WARC file bytes */;
let manifest: &[u8] = /* C2PA manifest store bytes */;
let signed = append_manifest(warc_data, manifest, "urn:uuid:12345678-1234-1234-1234-123456789012").unwrap();

Read a manifest

use c2pa_warc::read_manifest;

let manifest = read_manifest(&warc_data).unwrap();

Multiple manifests

A WARC file carries at most one manifest record, always last. An update removes the existing manifest record and appends the replacement, which leaves the bytes of every other record unchanged. When WARC files are concatenated, the combining tool appends a fresh manifest covering all records in the combined file and removes the constituent manifest records, which may be referenced as ingredients.

Example

cargo run --example make_sample_warc writes a minimal WARC (examples/sample.warc) containing a warcinfo record, one captured response record, and a trailing c2paprovenance record whose block is a real C2PA Manifest Store, then extracts it back to examples/sample.manifest.c2pa. The manifest record header:

WARC/1.1
WARC-Type: c2paprovenance
WARC-Record-ID: <urn:uuid:...>
WARC-Date: ...
Content-Type: application/c2pa
Content-Length: 3576

Design

Manifest stored as a WARC record of a dedicated c2paprovenance type, as the last record in the file; it carries no WARC-Target-URI
At most one manifest record; an update removes the existing one and appends the replacement
Manifest records are identified by WARC-Type: c2paprovenance together with Content-Type: application/c2pa

Scope

This crate implements embedding and extraction only. Content binding — the C2PA collection data hash, computed over each record's uncompressed bytes — is out of scope; use the official C2PA SDK to build and sign manifests.

Related Crates

Part of a family of single-purpose crates, one per C2PA embedding method. Each is standalone and independently versioned.

Crate	Description
c2pa-structured-text	Structured text: ASCII-armoured manifest in a comment or front matter
c2pa-unstructured-text	Unstructured text: invisible Unicode variation-selector run
c2pa-html	HTML: `script` and `link` elements in the document head
c2pa-http	HTTP: the `c2pa-manifest` `Link` header, with a Tower middleware
c2pa-text-binding	Soft binding and content fingerprinting for text assets
c2pa-vtt	WebVTT caption and subtitle embedding
c2pa-zip	ZIP-based documents: EPUB, DOCX, ODT, OXPS
c2pa-fonts	OpenType/TrueType (SFNT) font embedding
c2pa-ml	ML model containers: GGUF, SafeTensors, ONNX
c2pa	Official C2PA SDK

Security

Found a vulnerability? Please report it privately — see SECURITY.md.

License

Licensed under either of Apache License, Version 2.0 or MIT License at your option.

Built by WritersLogic

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

c2pa_warc-0.2.1.tar.gz (26.0 kB view details)

Uploaded Aug 3, 2026 Source

Built Distributions

If you're not sure about the file name format, learn more about wheel file names.

The dropdown lists show the available interpreters, ABIs, and platforms. Enable javascript to be able to filter the list of wheel files.

c2pa_warc-0.2.1-cp39-abi3-win_amd64.whl (122.7 kB view details)

Uploaded Aug 3, 2026 CPython 3.9+Windows x86-64

c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (260.9 kB view details)

Uploaded Aug 3, 2026 CPython 3.9+manylinux: glibc 2.17+ x86-64

c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl (255.3 kB view details)

Uploaded Aug 3, 2026 CPython 3.9+manylinux: glibc 2.17+ ARM64

c2pa_warc-0.2.1-cp39-abi3-macosx_11_0_arm64.whl (225.5 kB view details)

Uploaded Aug 3, 2026 CPython 3.9+macOS 11.0+ ARM64

c2pa_warc-0.2.1-cp39-abi3-macosx_10_12_x86_64.whl (227.4 kB view details)

Uploaded Aug 3, 2026 CPython 3.9+macOS 10.12+ x86-64

File details

Details for the file c2pa_warc-0.2.1.tar.gz.

File metadata

Download URL: c2pa_warc-0.2.1.tar.gz
Upload date: Aug 3, 2026
Size: 26.0 kB
Tags: Source
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for c2pa_warc-0.2.1.tar.gz
Algorithm	Hash digest
SHA256	`e64116c6b6f3f2723166951b0611b985b67c09d18500112611a3e46fec4577b8`
MD5	`e0504a956812bcaaae598c12cadc0a75`
BLAKE2b-256	`86811e9a9e4c9e3189b3bdb6b8f8321c9c00e31572938e613590e9c534ef7289`

See more details on using hashes here.

Provenance

The following attestation bundles were made for c2pa_warc-0.2.1.tar.gz:

Publisher: release.yml on writerslogic/c2pa-warc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: c2pa_warc-0.2.1.tar.gz
- Subject digest: e64116c6b6f3f2723166951b0611b985b67c09d18500112611a3e46fec4577b8
- Sigstore transparency entry: 2337207185
- Sigstore integration time: Aug 3, 2026
Source repository:
- Permalink: writerslogic/c2pa-warc@ea8847b43c737623a920824a5bf822e61649a7a3
- Branch / Tag: refs/tags/v0.2.1
- Owner: https://github.com/writerslogic
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@ea8847b43c737623a920824a5bf822e61649a7a3
- Trigger Event: push

File details

Details for the file c2pa_warc-0.2.1-cp39-abi3-win_amd64.whl.

File metadata

Download URL: c2pa_warc-0.2.1-cp39-abi3-win_amd64.whl
Upload date: Aug 3, 2026
Size: 122.7 kB
Tags: CPython 3.9+, Windows x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for c2pa_warc-0.2.1-cp39-abi3-win_amd64.whl
Algorithm	Hash digest
SHA256	`08db1b270f3d790a0223811000000c0e2d7213d4d5628afe7791ac466df9216e`
MD5	`f4cbdb1a270903a53897a19bca2a5de4`
BLAKE2b-256	`e8ad58f00a504362e53a04e244a844b129a7dc7add227a7f12918b342ed96da7`

See more details on using hashes here.

Provenance

The following attestation bundles were made for c2pa_warc-0.2.1-cp39-abi3-win_amd64.whl:

Publisher: release.yml on writerslogic/c2pa-warc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: c2pa_warc-0.2.1-cp39-abi3-win_amd64.whl
- Subject digest: 08db1b270f3d790a0223811000000c0e2d7213d4d5628afe7791ac466df9216e
- Sigstore transparency entry: 2337207225
- Sigstore integration time: Aug 3, 2026
Source repository:
- Permalink: writerslogic/c2pa-warc@ea8847b43c737623a920824a5bf822e61649a7a3
- Branch / Tag: refs/tags/v0.2.1
- Owner: https://github.com/writerslogic
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@ea8847b43c737623a920824a5bf822e61649a7a3
- Trigger Event: push

File details

Details for the file c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl.

File metadata

Download URL: c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Upload date: Aug 3, 2026
Size: 260.9 kB
Tags: CPython 3.9+, manylinux: glibc 2.17+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Algorithm	Hash digest
SHA256	`d7a7cb117860681abe1ac9aac51d123b2ef3a364b719bf329d9cd7058cb2de35`
MD5	`d5b8f2e7a05d59805d71b8d1e70bc4b3`
BLAKE2b-256	`6fb28ac23b6fd2407a1a81a8bfcc41c54d29a6fd3dd3b008c564fd64179aa58b`

See more details on using hashes here.

Provenance

The following attestation bundles were made for c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl:

Publisher: release.yml on writerslogic/c2pa-warc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
- Subject digest: d7a7cb117860681abe1ac9aac51d123b2ef3a364b719bf329d9cd7058cb2de35
- Sigstore transparency entry: 2337207303
- Sigstore integration time: Aug 3, 2026
Source repository:
- Permalink: writerslogic/c2pa-warc@ea8847b43c737623a920824a5bf822e61649a7a3
- Branch / Tag: refs/tags/v0.2.1
- Owner: https://github.com/writerslogic
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@ea8847b43c737623a920824a5bf822e61649a7a3
- Trigger Event: push

File details

Details for the file c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl.

File metadata

Download URL: c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
Upload date: Aug 3, 2026
Size: 255.3 kB
Tags: CPython 3.9+, manylinux: glibc 2.17+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
Algorithm	Hash digest
SHA256	`b517a0461cae60098fca55c0163db6bf901a7902753249504c32d31f84e7fa70`
MD5	`bb9c0a31d04ef5606b2e839059f6c49e`
BLAKE2b-256	`fe875f97105935b69d780bb526998a7b9ca1499b07569b054651a1c0271c3039`

See more details on using hashes here.

Provenance

The following attestation bundles were made for c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl:

Publisher: release.yml on writerslogic/c2pa-warc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: c2pa_warc-0.2.1-cp39-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl
- Subject digest: b517a0461cae60098fca55c0163db6bf901a7902753249504c32d31f84e7fa70
- Sigstore transparency entry: 2337207342
- Sigstore integration time: Aug 3, 2026
Source repository:
- Permalink: writerslogic/c2pa-warc@ea8847b43c737623a920824a5bf822e61649a7a3
- Branch / Tag: refs/tags/v0.2.1
- Owner: https://github.com/writerslogic
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@ea8847b43c737623a920824a5bf822e61649a7a3
- Trigger Event: push

File details

Details for the file c2pa_warc-0.2.1-cp39-abi3-macosx_11_0_arm64.whl.

File metadata

Download URL: c2pa_warc-0.2.1-cp39-abi3-macosx_11_0_arm64.whl
Upload date: Aug 3, 2026
Size: 225.5 kB
Tags: CPython 3.9+, macOS 11.0+ ARM64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for c2pa_warc-0.2.1-cp39-abi3-macosx_11_0_arm64.whl
Algorithm	Hash digest
SHA256	`3b5b5c527ccc00d4644d129c83b64386d4f17e4cbd665fef40a40fcd00137e99`
MD5	`c07bcda98a369ccff32f1752650a4a42`
BLAKE2b-256	`7bc0d140664b1d7867b9f15b17bb0907629a431d2dfc2b0e2f136ec8390b37c5`

See more details on using hashes here.

Provenance

The following attestation bundles were made for c2pa_warc-0.2.1-cp39-abi3-macosx_11_0_arm64.whl:

Publisher: release.yml on writerslogic/c2pa-warc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: c2pa_warc-0.2.1-cp39-abi3-macosx_11_0_arm64.whl
- Subject digest: 3b5b5c527ccc00d4644d129c83b64386d4f17e4cbd665fef40a40fcd00137e99
- Sigstore transparency entry: 2337207382
- Sigstore integration time: Aug 3, 2026
Source repository:
- Permalink: writerslogic/c2pa-warc@ea8847b43c737623a920824a5bf822e61649a7a3
- Branch / Tag: refs/tags/v0.2.1
- Owner: https://github.com/writerslogic
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@ea8847b43c737623a920824a5bf822e61649a7a3
- Trigger Event: push

File details

Details for the file c2pa_warc-0.2.1-cp39-abi3-macosx_10_12_x86_64.whl.

File metadata

Download URL: c2pa_warc-0.2.1-cp39-abi3-macosx_10_12_x86_64.whl
Upload date: Aug 3, 2026
Size: 227.4 kB
Tags: CPython 3.9+, macOS 10.12+ x86-64
Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

File hashes

Hashes for c2pa_warc-0.2.1-cp39-abi3-macosx_10_12_x86_64.whl
Algorithm	Hash digest
SHA256	`7b9ddc1dad04de0afb4936f9c64f63302498929396579bda39793ec9d3dbf310`
MD5	`3d86901883595f5a05712b752e93547d`
BLAKE2b-256	`711baab069c0310d39fbeacf7beed2da0969eb1255ae39f92d9480dfa9d1ebf3`

See more details on using hashes here.

Provenance

The following attestation bundles were made for c2pa_warc-0.2.1-cp39-abi3-macosx_10_12_x86_64.whl:

Publisher: release.yml on writerslogic/c2pa-warc

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: c2pa_warc-0.2.1-cp39-abi3-macosx_10_12_x86_64.whl
- Subject digest: 7b9ddc1dad04de0afb4936f9c64f63302498929396579bda39793ec9d3dbf310
- Sigstore transparency entry: 2337207264
- Sigstore integration time: Aug 3, 2026
Source repository:
- Permalink: writerslogic/c2pa-warc@ea8847b43c737623a920824a5bf822e61649a7a3
- Branch / Tag: refs/tags/v0.2.1
- Owner: https://github.com/writerslogic
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release.yml@ea8847b43c737623a920824a5bf822e61649a7a3
- Trigger Event: push

Release history Release notifications | RSS feed

This release

0.2.1 This release

Aug 3, 2026 6 files

0.2.0

Aug 2, 2026 6 files

c2pa-warc 0.2.1

Overview

Quick Start

Append a manifest

Read a manifest

Multiple manifests

Example

Design

Scope

Related Crates

Security

License

Project links

Key dates

1 maintainer

GitHub Statistics

License

Requires

Tags

Classifiers

Download files

Source Distribution

Built Distributions

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

Release history Release notifications | RSS feed