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The clearest case is one ",[212,213,214],"a",{"href":142},"fingerprint"," showing up across accounts that should belong to different people. That's the signature of multi-accounting: one person running many accounts to farm referrals, dodge a ban, stack free trials, or stuff a vote.",[208,217,218,219,222,223,227,228,231,232,235],{},"Rupt scores this risk on every ",[212,220,221],{"href":98},"action"," (",[224,225,226],"code",{},"login",", ",[224,229,230],{},"signup",", and ",[224,233,234],{},"access",") because the same person can resurface at any of them.",[237,238,240],"h2",{"id":239},"what-rupt-looks-for","What Rupt looks for",[242,243,244],"ul",{},[245,246,247,251,252,254],"li",{},[248,249,250],"strong",{},"Shared fingerprint",": how many distinct users a single ",[212,253,214],{"href":142}," has been seen on. One device behind one account is normal. One device behind a dozen accounts is not.",[237,256,258],{"id":257},"severity-and-response","Severity and response",[208,260,261,262,265,266,269,270,273,274,277,278,281,282,285],{},"The check feeds a ",[224,263,264],{},"linked_accounts"," ",[212,267,268],{"href":110},"risk"," severity. Shared devices have innocent explanations, like a family computer or an office machine everyone logs into, so the count matters more than the sharing itself. A handful of accounts on one fingerprint is plausible; dozens is a ban-evasion ring. Most teams ",[212,271,272],{"href":150},"add the device to a list"," for review and escalate to a ",[212,275,276],{"href":122},"challenge"," or ",[224,279,280],{},"deny"," as the count climbs. Your ",[212,283,284],{"href":118},"policies"," decide where normal ends.",{"title":287,"searchDepth":288,"depth":288,"links":289},"",2,[290,291],{"id":239,"depth":288,"text":240},{"id":257,"depth":288,"text":258},"Linked accounts are separate accounts that share identifying state (most often the same fingerprint) when they should be independent. Useful for catching multi-accounting and ban evasion.","md",{},true,"---\ntitle: Linked accounts\ndescription: Linked accounts are separate accounts that share identifying state (most often the same fingerprint) when they should be independent. Useful for catching multi-accounting and ban evasion.\n---\n\n# Linked accounts\n\nLinked accounts are accounts that look independent but share identifying state underneath. The clearest case is one [fingerprint](\u002Fdocs\u002Fv3\u002Fconcepts\u002Ffingerprints) showing up across accounts that should belong to different people. That's the signature of multi-accounting: one person running many accounts to farm referrals, dodge a ban, stack free trials, or stuff a vote.\n\nRupt scores this risk on every [action](\u002Fdocs\u002Fv3\u002Fconcepts\u002Factions) (`login`, `signup`, and `access`) because the same person can resurface at any of them.\n\n## What Rupt looks for\n\n- **Shared fingerprint**: how many distinct users a single [fingerprint](\u002Fdocs\u002Fv3\u002Fconcepts\u002Ffingerprints) has been seen on. One device behind one account is normal. One device behind a dozen accounts is not.\n\n## Severity and response\n\nThe check feeds a `linked_accounts` [risk](\u002Fdocs\u002Fv3\u002Fconcepts\u002Frisks) severity. Shared devices have innocent explanations, like a family computer or an office machine everyone logs into, so the count matters more than the sharing itself. A handful of accounts on one fingerprint is plausible; dozens is a ban-evasion ring. Most teams [add the device to a list](\u002Fdocs\u002Fv3\u002Fconcepts\u002Flists) for review and escalate to a [challenge](\u002Fdocs\u002Fv3\u002Fconcepts\u002Fchallenges) or `deny` as the count climbs. Your [policies](\u002Fdocs\u002Fv3\u002Fconcepts\u002Fpolicies) decide where normal ends.\n",{"title":169,"description":292},"paqW4jkg6SOtHkH0X61BDxifDMv5Gm697L7mWFZqUK8",1780344893623]