Let’s Seal

Seal and verify surveys, valuations & EPCs

Valuation reports, homebuyer surveys, and EPCs that prove their own authenticity — so a lender, a buyer, or a conveyancer can confirm a report is the surveyor's genuine, unaltered version. A forged valuation or a doctored EPC fails on sight.

For chartered surveyors, valuers, and epc assessors.

Open the app Developer docs
What a seal proves

Four guarantees, in surveying & property reports

Figures and ratings can't be altered

A changed valuation, defect, or EPC rating fails verification. The lender sees the surveyor's real numbers, not a doctored version.

The surveyor or firm, named

Every report names the practice that sealed it, chaining to a published root — provable authorship, not a copied letterhead.

Fixed to the inspection date

The as-inspected date is timestamped on Bitcoin — decisive when a valuation or condition report is relied on for a transaction or a claim.

Verified without calling the practice

A lender, a buyer, or a conveyancer confirms the report at a permalink — instantly, and free.

How it works

From your file to a proof anyone can check

The same pipeline every time — the seal and the timestamp travel with the file, so the proof is self-contained.

Your file
Your signed PDF
Seal
Signed over every byte · PAdES
Anchor
Bitcoin timestamp + public transparency log
Proof page
A permanent /d/… link travels with the file
Anyone verifies
Free, public, offline-capable — for anyone
The proof travels inside the file. Verification stands on the published root, the transparency log, and the Bitcoin ledger — so a court, a bank, or a counterparty can check it independently, forever.
Step by step · the web app

Seal it in the app — no setup

  1. 1

    Sign in as your practice

    Open app.letsseal.org and sign in. Your firm gets its own certificate authority for sealing reports.

  2. 2

    Upload the report

    Drop in the valuation, survey, or EPC. It's sealed over the whole file, so any later edit to a figure or rating is caught.

  3. 3

    Anchored and logged automatically

    The fingerprint is timestamped on Bitcoin and written to the public transparency log. The client gets a normal PDF that also verifies.

  4. 4

    Deliver with a proof link

    Every report has a permanent proof page. The client or their lender opens the link to confirm the report is genuine and current.

Step by step · the CLI

Automate it from your terminal or CI

The sealbot CLI does the same thing, scriptably — one command per file, straight into your pipeline.

# Seal a valuation report under your practice
$ sealbot seal valuation-report.pdf --org examples
sealed   valuation-report.pdf
  proof  https://letsseal.org/d/2c74ef…b910
  anchored to Bitcoin · recorded in the transparency log

# Seal a run of survey reports as they're finalised
$ sealbot watch /srv/surveys --mode seal --org examples
watching /srv/surveys … sealing new & changed PDFs (idempotent)

# A lender confirms the report — public, no account
$ sealbot verify valuation-report.pdf
✓ authentic · unaltered · sealed by Let's Seal Examples

Seal reports one at a time or in a run. Each carries a permanent proof link a lender or conveyancer verifies against public infrastructure — no call to your practice.

Full CLI & API reference
See it in action

What a proof looks like, and what you can seal

Issuer verified — controls letsseal.org
Authentic & unaltered
Document
A sealed valuation report
Issuer
Let’s Seal Examplesletsseal.org
SHA-256
64-hex fingerprint ✓

Anchored on Bitcoin

Recorded in the public transparency log

Public and free to verify — by anyone, with standard tools.
Open the live proof

A single use case, many documents. Each of these is sealed the same way:

  • A sealed valuation report

    Live proof

    Open the proof page the way a mortgage lender would: it shows the valuation is authentic, unaltered since issue, produced by the named surveyor, and timestamped on Bitcoin — the anti-mortgage-fraud check, built in.

  • A homebuyer or building survey

    Seal the survey so a buyer and their conveyancer can confirm the defects and findings are exactly as reported — nothing added or quietly removed.

  • An EPC

    Energy assessments sealed on issue, so a buyer, tenant, or lender can confirm the rating is the assessor's genuine result, not an edited copy.

  • A party-wall award or condition report

    Awards and schedules of condition sealed and dated, so there's no dispute later about what was recorded at the time.

Live proofs are real documents sealed under the “Let’s Seal Examples” organisation.

Common documents

What you’ll seal

  • Valuation reports
  • Homebuyer & building surveys
  • EPCs
  • Party-wall awards
  • Condition reports
  • Schedules of condition
Questions

Straight answers

Does this help against mortgage fraud?
A sealed valuation can't be edited without failing verification, and a lender can check it against the proof link. An inflated or doctored valuation simply won't verify as the surveyor's issued report — which is exactly the fraud the check is trying to catch.
How does a lender verify a report?
They open the proof link, or drop the PDF into the public verifier. It confirms the report is genuine, unaltered, and produced by the named surveyor — with no call to your practice.
Does the client need special software?
No. They get a normal PDF that opens anywhere, and it also verifies against the public portal and any standard PAdES validator.
Does this replace a surveyor's professional judgement?
No — it makes the report tamper-evident and independently checkable. The findings and figures are still the surveyor's; the seal proves the document is exactly as they issued it.

Start sealing surveying & property reports documents

Free and open. Seal in the app, automate from the CLI, and hand anyone a proof they can verify themselves.

Open the app All use cases