Prove any document existed — exactly as it was — at a specific point in time
Contracts get disputed. Invoices get challenged. Reports get questioned months after filing. When that happens, the question is always the same: can you prove the document hasn't changed? Document anchoring gives you that proof — permanently, cryptographically, and independently verifiable by anyone.
The document integrity problem
Every business runs on documents — contracts, invoices, policies, reports. But the moment a dispute arises, the same question derails everything: “How do we know this hasn't been changed?”
Multiple copies across email, shared drives, and local folders. Nobody can prove which is the original.
File timestamps can be changed. "Last modified" proves nothing in a dispute. Courts know this.
When an auditor or lawyer asks for proof, engineering teams spend days reconstructing timelines from logs.
Without independent proof, document disputes become "he said, she said." The side with better lawyers wins.
What changes with document anchoring
Anchor a document the moment it matters — at signing, at submission, at delivery. From that point forward, anyone can verify the document hasn't changed. No special software required. No trust in any single party.
Every anchored document gets a unique cryptographic fingerprint. If even a single character changes, the fingerprint won't match — and everyone can see it.
The exact moment of anchoring is recorded and cryptographically signed. It can't be backdated, adjusted, or overwritten. The timestamp is part of the proof.
Every anchor produces a public verification link. Auditors, counterparties, courts — anyone can check document integrity without needing an Invoance account.
You hash the document locally and send only the fingerprint. The original file stays on your infrastructure. Optional storage is available if you want retrieval convenience.
Each anchor is signed with your organization's key. The proof shows not just that the document existed, but that your organization anchored it.
Contracts, invoices, reports, policies, certificates, images, spreadsheets — anything that exists as a file can be anchored. No format restrictions.
How it works
No changes to your document workflow. No new tools for your team to learn. Anchor happens after your existing process — one step, and the proof exists forever.
Contract signed, invoice issued, report filed — your existing workflow stays exactly the same.
A unique cryptographic hash is computed from the document bytes. This happens locally — the document never leaves your systems.
The hash, timestamp, and your organizational identity are cryptographically signed and written to the Invoance ledger. Immutable from this point forward.
A public verification link is generated. Any third party can confirm the document hasn't changed — no Invoance account needed.
When proof matters most
Document disputes follow a predictable pattern: one party claims a document was altered after the fact. Without independent proof, it becomes testimony against testimony. These are the moments where anchoring changes the outcome.
A counterparty claims contract terms were changed after execution.
Both sides have a copy. Metadata is inconclusive. The dispute becomes a credibility contest. Legal fees accumulate.
Contract anchored at signing. The cryptographic fingerprint matches your copy. Dispute resolved with math, not testimony.
A regulator questions whether a filed report matches the version on record.
Engineering reconstructs a timeline from file system metadata and email archives. Weeks of work. Auditor still isn't satisfied.
Report anchored at submission. Regulator verifies via public link in seconds. No engineering involvement.
A vendor claims payment terms on the original invoice were different.
Both parties produce copies. Email chains are ambiguous. The finance team spends weeks sorting it out.
Invoice anchored at issuance. Hash comparison proves which version was authoritative at delivery. Dispute closed.
An auditor needs proof that a policy was in effect on a specific date.
Documents produced from shared drives. Auditor can't rule out post-dated modifications. Finding escalated.
Policy anchored when published. The signed timestamp proves when it took effect. Auditor verifies independently.
What anchoring proves — and what it doesn't
Anchoring is a point-in-time integrity guarantee. It answers “has this changed?” — not “is this true?” Those are different questions and require different tools. Being precise about this distinction is what makes the proof credible.
Built for every team that touches documents
Document anchoring isn't just for legal teams. Anyone who needs to prove a document hasn't changed — from finance to compliance to operations — gets the same cryptographic guarantee.
Anchor agreements at execution. When terms are disputed, the proof is already there — no reconstruction needed.
NDAs, service agreements, employment contracts
Lock invoices and financial records at issuance. Eliminate disputes over which version was authoritative.
Invoices, purchase orders, payment confirmations
Anchor regulatory filings at submission. Give auditors independently verifiable proof without engineering support.
Audit reports, compliance certifications, regulatory filings
Freeze vendor agreements and delivery records at the point of commitment. Resolve supplier disputes with evidence.
Vendor contracts, delivery receipts, SLAs
Anchor policies when published to establish effective dates. Prove training completions weren't backdated.
Policies, procedures, training records
Lock technical specifications at approval. Establish the authoritative version of architecture decisions and API contracts.
Design docs, API specs, architecture records
Three anchoring surfaces — one platform
Document anchoring is one of three proof products in Invoance. Each addresses a different anchoring need with the same cryptographic foundation.
Stop arguing about documents. Start proving them.
Document anchoring is available on all plans. Free tier includes 50 documents per month. No document storage required — the cryptographic proof stands on its own.
Document Anchoring — Cryptographic Proof of Document Integrity
Prove any document existed — exactly as it was — at a specific point in time. Contracts get disputed. Invoices get challenged. Reports get questioned months after filing. Document anchoring gives you permanent, cryptographic, independently verifiable proof that a document has not been altered.