File the StopNCII hash for subreddit deepfake on Mastodon

Why this matters for subreddit deepfake on Mastodon

Subreddits dedicated to deepfake content have been a documented enforcement target for Reddit. The platform has banned multiple deepfake subreddits over the past several years, but new ones recur.
Federated content spreads across multiple instances through reposts and replies. Removing from the originating instance does not remove from the cached copies on every instance that federated the post.
Cross platform spread cases require coordinated multi platform response because content removed from one platform routinely appears on another within hours. The leverage is operational disruption of the redistribution network, not chasing individual posts.
Social platform distribution drives the majority of secondary discovery because account based interactions surface content to the victim's existing network within hours.
Reddit enforcement at the subreddit level produces comprehensive removal including all hosted content and the operating community simultaneously. This is more effective than chasing individual posts. This is particularly relevant when the action you are pursuing is file the StopNCII hash, because after the initial platform removal is in progress. the hash submission provides ongoing prevention against re upload across the partner platform network.

How removal works

The four step deepfake removal process under the TAKE IT DOWN Act of 2026.

What to do, step by step

01
Forensically preserve every instance before any other action Capture full page screenshots with the URL bar visible, save the highest resolution copy of the subreddit deepfakes available, and document any visible AI generator fingerprints including watermarks, edge blending artifacts, and skin texture inconsistencies. Subreddit name and URL
02
Run a biometric scan to find every copy across platforms subreddit deepfake content distributed on Mastodon rarely stays there. ScanErase indexes 2.4 billion face embeddings across 200 plus platforms and identifies every current hosting location in a single scan, including mirror copies and AI generated variants.
03
Submit the perceptual hash to StopNCII.org Generate the perceptual hash on your own device using the StopNCII.org tool. Submit only the hash, not the image itself. The hash will be propagated to Mastodon and other StopNCII.org partner platforms within 48 hours, preventing identical re upload across the partner network.
04
Preserve identification metadata for subpoena Even anonymous accounts produce identifiable metadata through Mastodon. Account creation IP, device fingerprint, and posting history support law enforcement subpoena to identify the perpetrator. Doe defendant filings preserve civil claims while identification proceeds.
05
Coordinate the Mastodon platform removal pipeline Mastodon is federated across thousands of independent instances. Removal requires identifying the specific instance hosting the content and contacting that instance's admin directly.
06
Escalate through hosting and CDN if required Each Mastodon instance has its own admin. Most instance admins are responsive to NCII reports. The fediverse operates a shared block list which can prevent the originating instance from federating with mainstream instances.
07
File the complete evidence record for the legal track StopNCII.org operates under the legal framework of the Revenge Porn Helpline (UK) provides the foundational legal basis for this action. Document every notice sent, every platform response, and every confirmation in a single evidence file. ScanErase produces this Verified Removal Package automatically as your case progresses.

The 48 hour statutory deadline

Statutory 48 hour removal timeline: 47 USC 223a requires platforms to remove non-consensual intimate imagery within 48 hours of a valid notice.

Legal context

StopNCII.org operates under the legal framework of the Revenge Porn Helpline (UK)
Participating platforms enforce hash matches under their own terms of service
Most Mastodon instance admins comply quickly with NCII reports. The Mastodon Server Covenant explicitly prohibits NCII content, which gives leverage even with instances outside US jurisdiction.
subreddit deepfake statutory basis: 47 USC 223a TAKE IT DOWN Act for the deepfake content removal
Reddit content policy enforcement at both content and subreddit level

Frequently asked questions

How do I stop deepfake content from spreading to additional platforms?

Coordinated multi platform notice combined with the StopNCII.org perceptual hash provides the strongest spread prevention available. The hash submission blocks identical re upload across the partner network, while the coordinated notices remove existing distribution before it reaches additional platforms.

How long will Mastodon actually take to remove the deepfake content?

Mastodon typically responds in approximately 48 hours when a properly formatted statutory notice is filed. ScanErase files the notice within 5 minutes of authorization and tracks compliance through your Verified Removal Package.

Will the platform notify the perpetrator that I filed the takedown notice?

Most platforms provide some notification to the account that posted the content, but the notification typically does not identify you. Your name and contact information are not shared with the perpetrator. The notification is limited to the fact that content was removed under a statutory NCII notice.

What if the perpetrator re uploads the deepfake to Mastodon after removal?

Mastodon retains hash signatures of removed NCII content which prevents identical re uploads to the same platform. A follow-up ScanErase scan checks for re uploads across all 200 plus indexed platforms, including AI generated variant versions, so you can file a new notice as soon as matches reappear.

Will the file the StopNCII hash action reveal my identity to Mastodon or the perpetrator?

Permanent perceptual hash record across the StopNCII.org partner network. Future upload attempts of the matching deepfake to participating platforms are blocked at the upload stage. The disclosure scope is limited to what the action requires. Your scan and removal process is not disclosed to employers, family, or any third parties beyond the recipients required by the specific legal procedure.

I searched deepfakes of me are in a subreddit and found this guide. What is the very first thing I should do right now?

Before any other action, forensically preserve the evidence with full page screenshots and the highest resolution file copies you can obtain. Do not engage in the subreddit comments from any account. Engagement provides additional content for the subreddit moderators to work with and complicates the platform takedown narrative. Once evidence is preserved, the Mastodon takedown notice and the file the StopNCII hash action can proceed in parallel.

Submit a perceptual hash to StopNCII.org for subreddit deepfake on Mastodon