Digital Sketchbook as Proof: What to Save and When

Keep your work files at set stages (thumbnail, rough, mid-point layers, final), add a short dated note each time you save one, and back it all up somewhere that stamps its own dates. That gives you something real to show if anyone asks who made the piece. It does not settle a dispute by itself, and it is not a legal document.

That last part matters, so here is the plain version. A sketchbook is your own record. It supports a claim of authorship. What it does for you depends on how you keep it, and the rest of this post is about keeping it well.

Why a dated sketchbook is worth the effort

Copyright in a drawing arises automatically once the work exists, on paper or in digital form. You do not have to file anything for that. But a UK law firm's guide to copyrighting a drawing points out that you may still need to show you are the owner, and suggests keeping a detailed, dated log of your drawings.

Most advice stops right there: "keep a log." Nobody says what a log looks like on a Tuesday afternoon when you have a deadline. That is the gap this post fills.

Other art-business writers give similar advice. AGI Fine Art and Artwork Archive both cover protecting your art. Both are businesses with services to sell, and none of these pages tells you what to do with your files on an ordinary working day. Treat their advice as common sense, not as a ruling.

What to save, and when

You do not need to save every brush stroke. Pick four moments in each piece and keep a copy at each one.

1. The first idea. A thumbnail, a messy block-in, a mood board. Anything that shows the piece before it looked like the piece.
2. The rough. The version where the shapes and composition are settled but nothing is clean yet.
3. The mid-point file with layers. Keep the layered file, not just a flat export. Layers show how the piece was built.
4. The final, plus the file you delivered. If the client receives a flattened PNG, keep the layered original next to it.

One 2026 guide on proving human authorship in AI-assisted work gives a similar list: save originals, edited layered files and tool metadata at key stages. It is a legal-service site, so read it as one view, but the habit itself costs you nothing.

If you used an AI tool for anything, even a reference image, save that too and say so in your note. More on that below.

How to name and store the files

Boring beats clever here.

• Name files with the date first. 2026-10-03_harbor-poster_rough.psd sorts itself. final_final_v3 does not.
• Never overwrite the early files. Save a new copy at each stage. Disk space is cheap and the early versions are the whole point.
• Do not edit the dates. Do not re-save old files just to tidy them, because the saved date changes when you do.
• Back up somewhere that adds its own timestamp. Cloud storage and version-controlled folders record when a file arrived. Dates you did not set yourself are harder to question than dates you did.
• Keep one folder per project. Everything for a job sits in one place, including the brief and the delivered file.

If you work in Photoshop, the app has its own history feature, covered in Photoshop version history: turning it on, what it records. It helps, and it is a different record from your sketchbook folder.

What goes in a log entry

The other half of the habit is the note. It takes a minute. Each entry has four parts:

Part	Example (made up)
Date	2026-10-03
File	harbor-poster_rough.psd
What changed	Settled the boat placement, redrew the horizon line twice
Tools used	Procreate, Photoshop. No AI tools.

That row is a made-up example, not a real client or project. Your notes can be this short. The point is that you wrote it down on the day, not three months later.

That last column matters. If you use an AI tool for a small thing, such as an image to check a pose, write it down plainly. A note that says what you used reads far better than a note that leaves it out and gets questioned later. Honest notes are the useful kind.

What a sketchbook can and cannot show

Be straight with yourself about the limits, because a client or a platform will see them too.

It can show:

• The order your piece developed in
• That earlier versions existed on the dates you saved them
• That you kept working notes as you went

It cannot show:

• How long you actually spent. It shows what you chose to save, not the hours in between
• That nobody else made the files. A sketchbook is your own record, and records you build yourself can be built after the fact
• Whether any step was generated by a tool, unless you wrote that down

None of that makes the habit pointless. It makes it one layer. A client who asks to see your process will usually be happy with a clear set of dated stages. If they push, see A client thinks your art is AI. Here's what to say. for what to send.

Sketchbook, registration and a process certificate

These three get mixed up, so here is how they differ.

• A sketchbook is your own dated record, kept by you.
• A registration is an official public record with its own rules. In the US, the Copyright Office lists an electronic filing fee of $45 for one work by one author, not made for hire. That figure was current at the time of writing, and the Office has published fee proposals, so check the live page before you rely on it.
• A process certificate is a record made while the work happens.

Do not rank them by legal weight, because they do different jobs and none of them is legal advice. If you already keep dated files, they make good material for a registration. The how-to, fees and timing are covered in How to Register Copyright for Digital Illustrations, so this post will not repeat them. Timing rules exist, so read that guide before you decide when to file.

A weekly routine that actually sticks

The habit fails when it feels like paperwork. Make it small.

1. At each of the four stages, hit Save As with the dated name. Ten seconds.
2. At the end of the session, add one line to the log. Thirty seconds.
3. Once a week, check that the backup ran. One minute.
4. When the job ships, copy the delivered file into the project folder and write the delivery date in the log.

That is under two minutes a session. If you skip a day, do not backfill with made-up dates. Write the real date and move on.

Where a process certificate fits in

A sketchbook records what you chose to save. It does not record time spent, how the file grew, or which apps were open. A process certificate does, and it records those things while you work.

DrawDog is a menu bar and system tray app for Mac and Windows. It records session time, file growth, stroke frequency and app usage while you work, and it never records file contents, file names, folder paths, keystrokes, screen contents or browser tabs. Its certificate shows time spent, stroke count, AI tool percentage and a file fingerprint match. The client can open the link without an account and without installing anything. It does not prove a piece could never have been made another way, and the site says so openly. It supports Procreate, Photoshop and Figma, plus writing apps.

Your sketchbook folder and a certificate work well together. The folder shows the stages. The certificate shows the session.

Keep the habit, add the record

Start with the four stages and the one-line log. If you want the session record too, try DrawDog free. The free tier covers three certificates a month and needs no credit card. Download DrawDog and run it on your next piece.

If you want proof that holds up before a client asks for it, read what a DrawDog certificate records or download DrawDog and seal your next piece as you make it.