Cristian Cascante Portabella v1.0.0
Proof your files existed
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From the marketplace listing
Sellat creates independently verifiable proof that an exact file existed at a given moment. Ask to protect a file and a Sellat panel opens in the conversation: your browser computes the file's SHA-256 fingerprint, and only that fingerprint and the file name reach Sellat. The file never leaves your device. Sellat anchors the fingerprint on the public Polygon blockchain in a Merkle batch and attests it on Bitcoin through OpenTimestamps, so anyone can verify the proof later without trusting Sellat. You can also add a qualified electronic timestamp from FNMT-RCM (eIDAS, RFC 3161) to a proof. It uses one of the qualified seals available in your Sellat account and is only requested when you ask for it. From here you can: - Protect a file, or a SHA-256 fingerprint you already have. - Check the status of a proof: Polygon anchor, Bitcoin confirmation, qualified seal and certificate link. - List your proofs. - See your plan, today's budget and the qualified seals you have left. - Add the FNMT-RCM qualified timestamp to a proof. Built for freelancers, creators, small businesses and anyone who needs evidence that a document, photo, contract or design existed in a given state at a given time. Limits: a proof shows that those exact bytes existed no later than the anchored time; on its own it does not prove authorship or ownership. Proofs are anchored in batches, and each proof tells you when its batch is anchored. Files kept in custody, billing and account settings stay in the Sellat dashboard, out of reach of the plugin. It needs a Sellat account. You choose what it may do on the consent screen, the qualified seal is a separate permission, and you can disconnect it at any time from your Sellat dashboard.
Language: English · Automatically detected from descriptions.
Oct 27, 2026 · 1 saved observations
Metadata · Oct 27, 2026 · 00:56 UTC · Compared with Oct 24, 2026 · 13:44 UTC
Package or technical metadata updated
Observed in package metadata. These changes alone do not establish a new customer-facing feature.
Oct 24, 2026 · 13:44 UTC
Not present
Oct 27, 2026 · 00:56 UTC
false
From the developer’s listing and package; capabilities are not independently tested. Package observed Nov 2, 2026.
Review scenarios; not an exhaustive list.
Sellat sells nothing through this plugin. It only uses qualified seals the account already has, and only when the user asks for one.
Terms may have changed since this observation.
Protect a file with Sellat without uploading it.
First release: protect a file from a panel that computes its fingerprint in the browser, protect a known fingerprint, check and list proofs, see the account, and add the FNMT-RCM qualified timestamp.
Declared in the saved package. Remote tools may change independently.
Publisher declarations from the archived package. These are separate from our research and the live service's terms.
Package observed Nov 2, 2026.
plugin_asdk_app_6ac4129101808191a878a9b88ed1260a
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