Sign your works.

1. Install the ArtFirma app on your phone.
2. Write down your twelve words. They are your signature, and only you keep them.
3. Show once that the key is yours, with one line on your website, your gallery page or your Instagram profile. We can assist you with this step.
4. Sign your first work and fix the seal to it.

Allow about twenty minutes the first time.

Informing your collectors: a single sentence is enough: “Hold a phone to the reverse of the work to confirm it is mine.” Images for your own communications: what the phone shows · an X-Ray view of a seal.

• Signing is done with the ArtFirma app, on iPhone or Android. Checking a seal needs no app: any NFC phone will do.
• Seals: order them on the order page, in sets of 20, 40, 60, 100 or 500, with free UPS tracked delivery. Your address is never published. Each seal holds an NXP NTAG 424 DNA chip, 22 mm across.
• Where it goes: on the frame, mount or stretcher, never directly on the back of the canvas or the paper itself. Under a sculpture or object, or inside the foot of a vessel. For a print delivered unframed, fix the seal to its provenance document. Not on metal, which the phone cannot read through. Seals are tamper resistant.
• Time: once the record is ready, about a minute per work. Each seal is signed in a few seconds, one at a time, while it touches the phone.
• Many works?
  • Every piece has its own seal. A whole edition can share one record: tap Sign seal again for each print.
  • You choose what to seal: everything, or only the numbered prints and the more important works.
  • Seals are signed one by one. We do not prepare records on an artist's behalf, but an assistant or someone you trust can, and we will guide them through every step.
• Help at any step: write to contact@artfirma.com with a screenshot. We answer in English or Spanish.
• The app is free, and so is checking. On iPhone, install it from the App Store. On Android, install it from Google Play, or use the APK on this site for phones without Play (Android will ask you to allow it). The app is in English and Spanish and follows your phone's language.

1. iPhone: install ArtFirma from the App Store. Android: open ArtFirma on Google Play and tap Install. Updates arrive by themselves.
2. No Google Play on your Android phone? Tap or download the app file above (an APK), open it and, if Android asks, allow your browser to install unknown apps. It is the same app with the same certificate, so you can switch to Play later without reinstalling.
3. Later versions install over this one and keep your key.

APK signing certificate SHA-256 c521c8ab…9dddcdd4, the same as on Google Play.

Updating from the old app (installed before 13 October 2026)? The new ArtFirma app is a separate app and installs next to the old one. Open it, choose I already have my 12 words and type your words; it shows Registered as artist ✓ by itself. Then uninstall the old app. Seals and records you made stay valid; nothing on them changes.

1. In the app, choose Create new key (12 words). These twelve words are your signature: from them the app makes the key that signs your works.
2. Write them on paper and keep them somewhere safe, as you would any important document. Do not photograph them or send them to anyone, including us.
3. Tap I wrote them down and confirm the words it asks for.

Seals you have signed stay valid whatever happens. If the words are lost, no new works can be signed with this key; anyone who holds them can sign in your name, so keep them private. Already have words? Choose I already have my 12 words. Decide who will inherit them: heirs & estates.

1. In the app: ⚙ → Register as artist. Enter your name and your website or, without a website, your profile page (Artlogic, a link page, Instagram).
2. Tap Copy the line (artfirma-key=…) and put it where you entered: on a website, a page artfirma (Shopify: Online Store → Pages → Add page); on a profile page, in its text, visible without logging in.
3. Back in the app: Check & register. A green “Registered” card confirms that your key is recorded.

This is checked once: after “Registered” you can remove the line. Anyone checking your seals will see where your key was confirmed, on your website or your profile page. Only a website or a profile page can confirm a key, not a post or a comment.

1. In the phone's browser open a public page of the work with its title and a photo: your shop, website, Artlogic, or an Instagram post.
2. Share → ArtFirma (Sign this artwork). Check the fields (title, year, size, medium), correct any details, then tap Use this record for signing.
3. Wait for ✓ … published under the work number.
4. Touch a new seal to the back of the phone until Seal signed. If it says The seal moved away too early, hold it again.
5. Tap Open link: the page shows your name and the record. Fix the seal to the work.

A saved record never changes, because the seal carries its fingerprint. To correct one, save it under a new work number. Editions: one seal per print; to sign the next print with the same record, tap Sign seal again (or make a record per number if the number must be in it). Galleries sign with their own registered key, and the page then reads “Signed by Gallery on behalf of the artist”, so it is always clear who signed.

What we read from your artwork pages · Run it yourself, without depending on us