this post was submitted on 10 Jul 2025
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Eh... I am going to be on the Doubt column on this one until someone gets more information and other cases.
From my understanding of the way Switch carts are made there is no difference at all between a cart used on a console and the same cart resold for a different console. Nothing is stored to tie carts to hardware or accounts. Carts are meant to work with the multiple accounts on the Switch and with multiple Switch consoles at once, given that Nintendo very much expects to upsell you on a Mini/OLED/Switch 2 whatever.
This guy either a) did something else to trigger the ban, b) bought a bootleg cart somehow, although that doesn't seem like it'd be particularly profitable to sell on Switch, or c) hit a seriously weird bug.
Or, I guess d) is lying about it?
Nintendo is definitely not looking to ban used Switch 1 carts. They literally have no way to do so. There is no tool in the toolset to distinguish a cart someone else bought at the store from your own carts you bought at the store and then moved from a Switch 1 to a Switch 2.
At the absolute most I could entertain that the used cart had been used to make a backup and then the backup got flagged in a different jailbroken console or something, but I don't even know that Nintendo would be able to tell or that it would trip up their banhammer.
That doesn't mean I'm on board with their remote bricking policy, and if this turns out to be a bug or weird edge case it's just another thing to show that their overreach is not gonna play the way they thought it would.
But it is almost definitely not an attempt to ban users for buying used games.
EDIT: Looking at other reporting, it seems the user in question themselves hypothesized that the cart must have been dumped and said Nintendo requested proof of purchase to un-ban them, so I guess that's the most likely scenario?
This is absolutely not true; it's absolutely possible and even suspected that individual game carts themselves are signed with unique serial IDs or even full certificates or cryptographic signatures.
I think it's more likely the previous owner did dump the cart on to a MIG Switch or similar ROM cart. While the NS1 cannot tell the difference; it can still be updated to do so.
I think it's likely that in order to play titles online; your Switch 1 has to get the Cart Serial number from the cart and package it all up nicely and sign it neatly with the certificate from the system. So if said Nintendo Switch 1 already transferred that title out to a Switch 2, then there would be a record on file with Nintendo saying "NS1 with Serial XYZ transferred Title cart ABC with serial DEF to Switch 2 with serial GHI". Then when you put that cart into a different Switch 2 it notices and informs Nintendo of the new title and cart serial...which then immediately picks up on the change of ownership.
That might not raise red flags if you handed the cart over to your friend next door; but it certainly might raise red flags if you air-mailed the cart over to your buddy a few countries over.
People keep saying this. Being able to identify carts is not the same as being able to identify resold carts.
There is no tool to identify resold carts. People can and do travel and move to different countries with their consoles. There can be multiple accounts per console. People can feasibly have two consoles right next to each other connected to different networks and swap carts between them. People can change consoles because they upgraded or because they have multiple consoles in the household. And people can and do resell carts all the time.
And there is no way to differentiate those scenarios even if you can/could track each cart individually.
There could be a record of which consoles have played which carts, but that gives you exactly zero information about how many owners the cart has had.
Switch accounts aren't associated to consoles and physical game entitlements aren't associated to accounts. Any account can be in any console at any time and instantly show in in multiple places and while you could account for travel times it's a pretty pointless thing to do that, to my knowledge, Nintendo is not doing.
What is more likely is that a cart showing up many times at the same time could flag it. Which is what everybody, including the guy who had the problem, is hypothesizing. This has nothing to do with reselling or transfering ownership of the physical game, beyond the fact that buying a used, dumped cart is the only way to end up with a dumped cart without knowing there are potentially thousands of copies of it floating around.
Again; I must iterate how wrong you are.
These situations do not matter as the logic for detection is very simple. Is cartrige A with serial ABC in more places than is reasonably expected of that cartridge? With physical copies that limitation is exactly 1 place, 1 system at a time. Irrespective of who it's registered to or who owns it. Any cartridge that has been in more than one place at one time and your system cert is logged and inserted in the next upcoming ban wave / wave of system cert revocations. This revocation goes live on Nintendo's servers. Your system will not get the Online Service kiss of death until after this happens.
Other checks such as location, account, how often it happens and such can and may happen after this check to automatically limit false positives and prevent you from being instantly banned. But their system works; and it's consistent as to which condition triggers it; that's when the identity of any physical or digital game title is in more places than it is licensed to be in. (Actively caught piracy).
Except that they can, and do. See other comments around for the how and why...it's related to Nintendo Gold Points.
There absolutely is. An unmodified Switch console reports this sort of telemetry on a regular basis to Nintendo; and it's clear that they can ban your system based on bad Title IDs; (basically fake title headers, or dumped cartridge headers used to conceal flash cartrige usage)
They don't have to be. Just have to log that your System Certificate reported a new title. This System Certificate is used in all traffic to Nintendo as it authenticates your system to it's network.
You're going pretty deep into a rant to say the same thing I'm saying.
Read the previous post again. The point I'm making is that reselling a cartridge is not detectable in itself, but that the same cart being simultaneously found more than once is.
So that'd be the exact same thing you're saying.
As far as anybody can tell, this was a false positive in that process and once the guy provided proof of purchase, even for a used game purchase, his account was reinstated, but you do run the risk of finding yourself in this position if you end up accidentally buying a cart that has been dumped and shared on the Internet.