How Proof Works
A plain-language guide to how WillKeep proves your plan is real, current, and unchanged.
The problem with paper
Imagine your family finds your Will in a drawer after you pass. How do they know it's the latest version? How do they know nobody changed a page? How do they prove to a court that this is exactly what you intended?
With paper, they can't — not without expensive legal steps. That's the problem proof solves.
Think of it like a notary stamp — but digital and permanent
When you visit a notary, they verify your identity and stamp your document. That stamp says: “This person signed this document on this date.”
WillKeep does something similar, but better. Every time you update your plan, we create a unique digital fingerprint of your document — like a one-of-a-kind stamp that can never be forged or changed.
That fingerprint is saved to Attestr, a service that stores proof independently from Provisio. Even if Provisio disappeared tomorrow, the proof that your document existed, in that exact form, on that exact date, would still be verifiable.
What happens, step by step
You update your Will
Maybe you added a new beneficiary, changed your executor, or updated an address. You make the change inside Provisio.
We create a digital fingerprint
Provisio takes your document and creates a unique code — like a DNA sequence for your file. If even one comma changes, the fingerprint is completely different. This means no one can alter your document without it being obvious.
The fingerprint is saved to Attestr
Attestr is an independent proof service. It stores your fingerprint with a timestamp that can't be altered — not by you, not by us, not by anyone. Think of it like mailing yourself a sealed letter, but the post office is tamper-proof and never loses anything.
Anyone can verify it later
Your executor, your lawyer, or a court can take the document and check it against the stored fingerprint. If they match, it proves the document hasn't been changed since the date it was saved. No expert witness needed. No argument about versions.
A real-world example
June 2026: Sarah updates her Will to add her new grandchild as a beneficiary. She reviews the changes, confirms everything looks right, and notarizes it by video call with a Justice of the Peace. Provisio saves a proof record to Attestr.
March 2029: Sarah passes away. Her son Mark is the executor. He downloads the handoff package from Provisio.
At the lawyer's office: The lawyer asks: “How do we know this is the real, most recent version?” Mark shows the Attestr proof — it confirms the document was created on June 14, 2026, and hasn't been modified since. The fingerprints match perfectly.
Result: No dispute about versions. No question about authenticity. The probate process moves forward smoothly.
What is Attestr?
Attestr is a Canadian proof-of-existence service. It doesn't store your documents — it only stores the fingerprints. This means:
- Your documents stay private — Attestr never sees the contents of your Will
- Proof is independent — it exists outside of Provisio, so it's trustworthy even if you stop using our service
- Verification is free — anyone with the document can check it against the proof at any time, at no cost
- Timestamps can't be faked — once a fingerprint is recorded, the date is locked permanently
Common questions
Is this the same as blockchain?
Similar idea, simpler technology. Attestr creates tamper-proof records without the complexity or environmental cost of blockchain. The goal is the same: proof that can't be altered after the fact.
Does this replace a notary?
No — it complements one. A notary verifies your identity at the time of signing. Attestr proof verifies the document hasn't changed since that signing. Together, they create a much stronger chain of trust than either alone.
What if I update my Will again later?
Every update creates a new fingerprint and a new proof record. You build a verifiable history of your plan over time — showing exactly when each version was created. This is actually stronger than paper, where old versions are usually just thrown away.
Can someone fake the proof?
No. The fingerprint is created using a mathematical process (called hashing) that only works one way. You can go from document to fingerprint, but you can't go from fingerprint back to document. And you can't create a different document that produces the same fingerprint. It's the same technology banks use to protect transactions.
What happens to my proof if Provisio shuts down?
Your proof lives on Attestr, which is a separate company and service. As long as you have a copy of your document (which you can always export), you can verify it against the Attestr record — with or without Provisio.
Proof is included in every Core and Premium plan.
Every update you make is automatically fingerprinted and saved. No extra steps required.
Start WillKeep — Free