Every sign-off, sealed
Each coach sign-off is locked to the one before it. Your signed jumps form a chain that can't be quietly rewritten.
Trust · Sign-offs
A logbook you can prove.
A logbook is a legal record. Every coach sign-off in SkyLog is sealed and locked to the jumps before it — alter any jump and the chain visibly breaks. Not a scrapbook. A logbook a federation can trust.
◆Part of SkyLog — free for your first 50 jumps
Coach Sign-offs
SkyLog feature
What it does
When a coach signs off one of your jumps, that sign-off isn't just a note — it's sealed. Each one is locked to the sign-off before it, so your signed jumps form a chain. If a past jump is altered after the fact, the chain breaks in plain sight, and not even SkyLog can quietly repair it. That's the difference between a record and a story.
The sign-off flow is built for how coaching actually works. You share a jump for review; the coach approves it, asks for a revision, or declines. Approved jumps count toward your licence progression. A jump can carry sign-offs from more than one coach — your primary instructor and the camera flyer both — and every one of them joins the chain.
Capabilities
What you can do with it.
Tampering shows
Alter a signed jump after the fact and the chain visibly breaks. The damage is obvious — and permanent.
A real review flow
Share a jump, and the coach approves it, requests a revision, or declines. Re-share after a fix — same record, no clutter.
Counts toward your licence
Approved sign-offs feed your progression. The jumps that matter for a rating are marked as exactly that.
More than one coach per jump
Primary instructor and camera flyer can both sign the same jump. Every signature joins the chain.
Recognised by federations
USPA, APF, FFP and SFF recognise SkyLog as a valid digital logbook. The sign-off chain is why.
A look inside
[ product screenshot ]
A sealed coach sign-off — verified and locked to the chain.
Questions
Coach Sign-offs, answered.
01How does the coach signature chain actually work?
Every coach gets a unique signing key when they join. Each sign-off is sealed to the one before it, forming a chain. If anything alters a past jump, the chain visibly breaks — and not even we can repair it.
02Is this a replacement for my paper logbook?
In most jurisdictions, yes — USPA, APF, FFP and SFF recognise SkyLog as a valid digital logbook. Check with your own federation. If you prefer belt-and-braces, the export is signed and printable.
03Can a coach undo a sign-off?
A coach can decline or request a revision before approving. Once a jump is approved and sealed into the chain, the sign-off stands as a record — corrections are made by adding to the chain, never by quietly erasing it. That's the whole point.
04What if I jump somewhere my coach isn't on SkyLog?
You can still log the jump and record the coaching. A sign-off needs the coach to have a SkyLog profile — but a coach can create one in a couple of minutes, and many do exactly so they can sign their students' jumps.
Step to door
Start your logbook.
SkyLog is open to skydivers worldwide. Sign up free, log your first jump in under a minute.
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