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ORDIUS TECHNOLOGIES

Deterministic integrity for documents that drive important decisions.

When critical decisions rely on documents, confidence begins with the ability to verify that your document's byte-level integrity remains uncompromised.

Create an identity for important documents at no cost, embed an Ordius Block, and enable anyone to verify that your document remains unaltered.

BYTE DEPENDENCY PARADOX FOR PDFs — SOLVED.

Ordius is designed around several core doctrines:

  • We don't normalize the document.
  • We don't strip its metadata.
  • We don't maintain metadata-exclusion rules.
  • We don't require a sidecar identity.
  • We don't require PKI to determine document integrity.
  • We don't rewrite the original bytes when stamping.
  • We don't store or retain the document on our servers after processing.

Traditional digital trust establishes document trust through the ecosystem surrounding the document—its issuer, signer, certificates, policies, and compliance rules. Ordius establishes the identity of the document itself, allowing that identity to travel with the document.

Create Identity Verify Document

Why verify?

Documents don't merely support decisions.

They drive outcomes.

Clinical Decisions
Loan Approvals
Insurance Claims
Employment Offers
Visa Approvals
Government Permits
Legal Judgments

The cost of a compromised document isn't the document itself.

It's the decision that follows.

Ordius provides a mechanism to verify whether a document has been altered at the byte level, allowing you to establish whether its integrity remains uncompromised.

A document's value isn't measured alone by what it says.

It is also measured by whether anyone can trust it.

Verify document integrity in three simple steps.

1. Create Identity ↓ Upload your document. Receive an Ordius Block. Embed it into your document. Free.

2. Share Normally ↓ Continue sharing documents exactly as you do today. Email. Cloud storage. Messaging apps. USB drives. No workflow changes.

3. Verify ↓ The recipient uploads the document. Ordius verifies its embedded identity against the document as presented. If the document is unchanged, its integrity is verified. If it has been modified, Ordius tells you immediately.

What Ordius verification establishes

Document integrity at the byte level

Ordius provides a mechanism to verify whether a document has been altered at the byte level. Verification compares the document as presented against the deterministic identity established when the document was stamped.

The identity travels with the document

The Ordius Identity is embedded within the document through an Ordius Block. The document carries the reference required for its own later verification, without normalization, reconstruction, or replacement.

What does “unaltered” mean?

For Ordius, an unaltered document is one whose byte level identity remains consistent with the identity carried by its Ordius Block.

Changes made after stamping—even legitimate ones— will cause a mismatch between the embedded Ordius ID and the byte-level identity of the document as presented and integrity verification will fail. Adding a signature, annotation, form data, metadata, pages, or other content can change the document's underlying identity.

Ordius therefore establishes whether the document remains unchanged from the state in which its identity was established. It does not determine whether a subsequent modification was authorized, legitimate, or malicious.

What would you like to do today?

Create an Ordius ID for your document

Free (10 per day)

Generate an Ordius Identity and embed an Ordius Block into your document.

Create Identity

Verify Ordius ID on your Document

Free (10 per day)

Confirm whether a document has remained unchanged.

Verify Document

Need to work with more documents?

Check out our available plans

Explore our paid plans to work with more documents per day

Check Pricing

Building with Ordius?

Identity creation, verification APIs, integration guides, authentication, examples, and complete documentation are available in the Ordius Developer Portal.

Developer Portal →

Frequently Asked Questions

What is an Ordius ID?

An Ordius ID is the durable digital identity assigned to a document. It uniquely identifies that document and allows its integrity to be verified at any point in its lifecycle.

What is an Ordius Block?

The Ordius Block is the verification block embedded into your document after identity creation. It contains the information required for Ordius to recognize and verify the document without changing the document's content.

Why do you have daily usage limits?

Ordius is free for personal use. Daily usage limits help protect the platform from automated abuse while ensuring that everyone can reliably create and verify document identities at no cost. If your needs exceed the free daily limits or require automated integration, additional usage plans are available.

Does Ordius store my documents?

No. Ordius does not archive or retain copies of your documents. Identity creation and verification operate only on the information necessary to establish and verify document integrity.

How does Ordius determine whether a document has changed?

Ordius verification is deterministic. When a document is verified, Ordius derives its identity from the document itself and compares it against the embedded Ordius Identity. If the document is a bit-for-bit identical copy of the original stamped document, it will produce the same Ordius Identity and verification succeeds. If any part of the document changes — even a single byte — the resulting identity changes, and verification will indicate that the document no longer matches its embedded identity.

Why did verification fail after I sent my document?

Some file-transfer, document-management, security, or collaboration systems may modify documents during transmission. For example, a system may normalize a document, rewrite its internal structure, remove metadata, or otherwise alter portions of the file. If this occurs, the received copy may no longer contain the Ordius Block or may no longer correspond to the identity originally assigned to the document, and verification may fail. Your original stamped document in your local storage is not affected by this. If the original copy remains intact on your device, it still contains its Ordius Block. You can resend that original copy using a transport method that preserves the document. In our testing, Gmail successfully preserved Ordius-stamped PDFs through attachment delivery.