● Product · Content verification

ContentSign. Block content fraud.
Save money and your brand

ContentSign applies a cryptographic certificate to any document, image, or video at the moment of signing — binding the signer's identity, a timestamp, and a hash of the exact content into a tamper-evident C2PA manifest. The fingerprint is anchored on the Nodle Chain for an immutable, independent proof record. Modify the content after signing and the hash no longer matches: verification fails. Any recipient can verify against the C2PA standard without Nodle software. No dedicated hardware required.

The standard

ContentSign is built on C2PA

C2PA is the Coalition for Content Provenance and Authenticity, an open industry standard for signing and verifying digital content. It is not proprietary to Nodle. ContentSign implements C2PA so your signed content is verifiable by any C2PA-compatible tool, and you are never locked in to a single vendor.

Adobe

C2PA founding member

Microsoft

C2PA founding member

Google

C2PA member

BBC

C2PA founding member

● Step 01 · Sign

Content is signed at creation

ContentSign computes a SHA-256 hash of the exact content at the moment of signing. The hash, the signer identity, and a timestamp are written into a C2PA manifest. The manifest is embedded in the file metadata or attached as a sidecar, depending on format, and the fingerprint is anchored on the Nodle Chain as an immutable proof record. Any subsequent modification produces a different hash and fails verification.

● Step 02 · Distribute

Content moves normally

The C2PA manifest is embedded in or attached to the file and travels with it through any existing workflow, email, document management, or ERP. No special routing or separate transmission channel required. The file behaves normally in every system.

● Step 03 · Verify

Any recipient can verify

The recipient recomputes the hash of the received content and compares it against the hash in the C2PA manifest. If they match and the signer identity is valid, verification passes. If the content was modified after signing, the hashes diverge and verification fails. C2PA-compatible tools perform this check automatically, and the on-chain fingerprint provides an independent, immutable record even if the file's manifest is stripped. No Nodle software required for standard C2PA verification.

What ContentSign stops

The fraud it is built to prevent

Fraud type 01

Invoice fraud

Fraudulent invoices are submitted for payment by intercepting legitimate invoices and modifying bank details, amounts, or vendor information. ContentSign detects any modification between signing and payment approval. A signed invoice that arrives with a broken signature can be flagged automatically before payment is approved.

Tens of billions

Lost globally to invoice and payment fraud annually

Fraud type 02

Deepfaked approvals

AI-generated video and audio of executives authorizing wire transfers, contract changes, or access requests. ContentSign verifies that video and audio content is authentic and unmodified from the point of signing. A deepfaked approval has no valid C2PA signature.

$1.1B

Lost by US companies to deepfake fraud in 2025

Fraud type 03

Contract manipulation

Terms, amounts, or parties in contracts modified after signing. ContentSign binds the signature to the exact content at the moment of signing. Any post-signature modification is immediately detectable by any C2PA-compatible verification tool.

Fraud type 04

Media impersonation

Manipulated photos and video used to misrepresent events, products, or identities in a business context. Signed media carries a verifiable provenance record. Recipients can confirm the image or video is unmodified from the point of signing.

Supported content types

What ContentSign
‍signs and verifies

PDF

Invoices, contracts, purchase orders, and any PDF document in an approval workflow

JPEG · PNG

Photos used in insurance claims, product documentation, site surveys, and media

MP4 · Video

Video approvals, executive communications, and any video used in a business decision context

Audio

Voice approvals and recorded instructions used in financial or operational workflows

Word · DOCX

Contracts and agreements in editable format, signed at the point of finalization

And more

Additional file types supported via the C2PA standard. Ask us about your format

How it works

ContentSign in your existing workflow

01 · Create

Document created or approved

Invoice generated, contract finalized, or video recorded in your existing system.

02 · Sign

ContentSign applies C2PA signature

Tamper-evident signature bound to the exact content via API call or workflow integration.

03 · Distribute

Content moves normally

Signed content passes through email, ERP, or document management. No special handling.

04 · Verify

Recipient verifies authenticity

Any C2PA-compatible tool confirms the content is unmodified. Broken signature flags fraud.

Proof at scale · Vivendi

First enterprise deployment.
‍A global media group

Customer · Vivendi · 2024

"We carried out a project together with Nodle to certify our press releases through the adoption of the ContentSign solution."

Vivendi is a global leader in culture, entertainment, media, and communications. They adopted ContentSign to authenticate press releases and corporate documents, ensuring integrity and verifiability for any recipient without special software.

Fabien Aufrechter · VP, Vivendi · First enterprise ContentSign deployment · 2024

#1

First enterprise ContentSign customer

PDF

Press releases and corporate documents signed and verified

C2PA

Open standard. Any recipient can verify without Nodle software

2024

Live deployment. Production, not pilot

Product specifications

At a glance

Product

ContentSign · Content signing and verification for business-critical documents and media

Function

Applies a cryptographic certificate to any document, image, or video, binding signer identity, timestamp, and content hash into a tamper-evident C2PA manifest

Standard

C2PA · Coalition for Content Provenance and Authenticity. Open specification, not proprietary

How it works

Computes a SHA-256 hash, binds signer identity and timestamp, writes a C2PA manifest into or alongside the file. The fingerprint is anchored on the Nodle Chain as an immutable proof record

Fraud prevented

Invoice fraud · Deepfaked approvals · Forged contracts · Manipulated media · Impersonation

Supported content

Invoices · Contracts · PDFs · JPEG · PNG · MP4 · Audio · DOCX

C2PA compatibility

Works with any C2PA-compatible tool. Adobe, Microsoft, and others already support C2PA in their products

Signing

Tamper-evident signature applied at point of creation or approval. Any subsequent modification is detectable

Verification

Any recipient can verify authenticity against the C2PA record. No special software required for verification

Integration

Cloud API · Mobile SDK (iOS, Android, Linux) · On-premise option. Fits existing approval, DMS, and ERP workflows

Proof anchoring

Content fingerprint anchored on the Nodle Chain. The proof record is immutable and survives independently of the file

Data ownership

Customer retains full data ownership. Only the cryptographic fingerprint goes on-chain — content stays with the customer

Deployment

Software layer. No hardware to install, no infrastructure to provision

Cost model

No per-document subscription at asset level. Priced at platform level

Compliance and standards

Built on an open standard

ContentSign implements C2PA, an open industry standard. Your signed content is not locked to Nodle. Any C2PA-compatible tool can verify it, now and in the future — and the fingerprint anchored on the Nodle Chain gives you an immutable proof record that outlives the file itself.

C2PA compliant

Open standard · not proprietary

Anchored on Nodle Chain

Only fingerprints on-chain

Customer data ownership

API-first integration

No hardware required

Adobe compatible

Microsoft compatible

Get started

Connect with Nodle

Tell us what content fraud you are trying to stop and we will show you how ContentSign fits your workflow. No pitch deck. Straight to the technical detail.

Contact us

ContentSign. Block content fraud. Save money and your brand

ContentSign is built on C2PA

Adobe

Microsoft

Google

BBC

Content is signed at creation

Content moves normally

Any recipient can verify

The fraud it is built to prevent

Invoice fraud

Deepfaked approvals

Contract manipulation

Media impersonation

What ContentSign ‍signs and verifies

PDF

JPEG · PNG

MP4 · Video

Audio

Word · DOCX

And more

ContentSign in your existing workflow

Document created or approved

ContentSign applies C2PA signature

Content moves normally

Recipient verifies authenticity

First enterprise deployment. ‍A global media group

"We carried out a project together with Nodle to certify our press releases through the adoption of the ContentSign solution."

#1

PDF

C2PA

2024

At a glance

Built on an open standard

Connect with Nodle

ContentSign. Block content fraud.
Save money and your brand

What ContentSign
‍signs and verifies

First enterprise deployment.
‍A global media group