An offline-first logbook for technicians working under SPRAT and IRATA systems. Log hours from the tower top, capture supervisor signatures on the spot, back it all up to the cloud — and prove your record with a tamper‑evident hash chain.
Everything a technician's paper logbook does — minus the coffee stains, plus cryptographic proof.
Write entries from the truck, the tower top, or the trailer. Local SQLite is the source of truth — the cloud is optional, never required.
No signal neededEvery signed entry hashes into the one before it. Auditors don't have to trust us — they verify the chain.
Hash-chained signaturesYour supervisor signs on your screen, or from their own phone via a one-time signing link. Either way it lands in the same chain.
In-person + remoteA signed entry is never altered. Corrections become new entries that reference the original — exactly the trail an auditor wants to see.
Append-only recordYour full logbook backs up to your account and restores onto a new phone — chain intact. Lose the device, not a single hour.
Cloud backup + restoreInspection work gets its own verified ledger — UT, MT, PT and eleven methods in all — with its own signature chain, separate from your rope hours.
11 NDT methodsA full kit inventory — harnesses, ropes, hardware — with inspection history and service life per item. Flag a failed inspection before it flags you.
Inventory + inspectionsLocal notifications nudge you to log the day's hours while you still remember the details — no server required, like everything else.
On-device remindersHand over a clean, verifiable export when assessment day comes. Your hours, signatures, and chain — formatted to be checked.
Take it anywhereThe same model as a paper logbook with a witness — made cryptographic.
Hours, tasks, heights, methods. Required fields are gated before anything can be signed, so your record is complete the first time.
status: draft · missing_fields: none
Your supervisor reviews and signs. The entry is canonicalized and hashed — from that moment it can never be silently changed.
status: signed · hash: a3f9c1…e4d702
Each signature folds in the hash of the one before. Touch any entry and every link after it breaks — visibly.
chain: #0147 ← #0146 ← #0145 ← #0144
Send a one-time signing link. They review the exact entry — hash and all — and sign from wherever they are. You sync it back into the chain with a tap.
Every hour you don't log is an hour you can't prove. Start the chain today.