Signed
Every PDF is hashed and chained.
No signed artefact stands alone. Each one commits its hash to the chain. Tampering is detectable in milliseconds.
Product · Reports
Reports that are signed,hashed, and tamper-evident.
Every signed PDF is hashed, chained, publicly verifiable, and shareable through a single-use link with watermark, passcode, and view-count enforcement.
Signed PDFs · 01
SHA-256 chain on every signable artefact.
When a report is signed it commits its hash to the audit chain alongside the hash of the previous signed artefact. Tampering with the PDF — even a single byte — breaks the chain. The verification check is fast, public, and account-free.
Live example · interactive
A report anyone can prove is genuine.
A sample signed report and its cryptographic seal. Hit Verify integrity to run the same check the public verifier does — hash the file, match it against the immutable SHA-256 audit chain, and confirm nothing changed after signing.
Signed
Geotechnical Investigation Report
Foundation Recommendations — Plot 14 Development
RPT-2026-0412 · rev. B
- Prepared by
- J. Rao, Geotechnical Engineer
- Reviewed & signed
- A. Engineer, M.Tech (Geotech)
- License
- P.E. / IGS — 2026-GE-3391
- Signed
- 09 Jun 2026, 14:21 IST
- Step-up auth
- Passkey + email OTP
A. Engineer
Cryptographic seal
SHA-256 of the signed PDF
9f2c1a7d 4e0b8635 5c1f9a2e 7d0b4c8f 1a6e3d52 b9c07f48 a1d6e2b3 c4f50819- Audit-chain position
- #1,432
- Algorithm
- SHA-256 chain
Sample record (no client data). The real check runs entirely in your browser — drop a signed PDF at /verify and only the 64-byte hash is sent. UPDATE/DELETE on the chain are blocked at the database.
Validator-verifiable · 02
Re-verify any report from a CSV export.
The chain is not locked inside our database. Export the audit chain as CSV and any engineer can re-verify a report’s signature against it. The mathematics is the audit trail, not our hosting.
Single-use share links · 03
Send a report without giving away the project.
Each report can be shared via a watermarked single-use link with optional passcode and view-count cap. The recipient never sees your project list, your other clients, your pricing, or anything else.
AGS / DIGGS export · 04
Source-fidelity export to the formats your client uses.
Project investigation data can be exported to AGS 4.x or DIGGS 2.x. The report remains a signed PDF; use the project export when a client needs structured investigation data.
The three guarantees · 05
Signed. Shareable. Exportable.
Shareable
Watermark, passcode, view-count.
Single-use link controls let you ship a report to a client without exposing anything beyond it. Revoke at any time.
Exportable
AGS 4.x and DIGGS 2.x native.
Source-fidelity exports that pass our validator before leaving the tenant. No clean-up step. No third-party editor needed.
Ship a report your client cannot question.
1-month free trial. Bring the data, leave with a signed PDF whose authenticity is mathematically provable.