Typed email OTP: which managed implementations prevent concurrent reuse?
Hi all, I’m evaluating managed authentication while retaining Supabase for the database. Users should type an emailed one-time code rather than follow a magic link. The requirement is at most one successful redemption of each issued proof, including overlapping submissions. For example, two simultaneous verification requests using the same issued OTP must not create two independent sessions. This…
A user is seeking information on how to prevent concurrent reuse of one-time passwords (OTP) in managed authentication systems. They are evaluating Supabase Auth and other managed providers such as Amazon Cognito, Clerk, and Auth0, but they want to ensure that the systems prevent multiple successful verifications using the same OTP, even if the requests are made simultaneously.
The user clarifies that this is not about restricting one session per user, but about ensuring that a single OTP can only be redeemed once, even if multiple verification requests are made at the same time. They suggest that generic "single-use" wording and rejection of sequential reuse are not sufficient on their own to guarantee concurrency safety.
The user is looking for firsthand implementation experiences or documented evidence of how these managed authentication services handle concurrent OTP redemption, including any specific configuration required to achieve this behavior. They emphasize the need for verifiable sources to correct any misunderstanding about the capabilities of these providers.
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