The DPoP Storage Paradox: Why Browser-Based Proof-of-Possession Remains an Unsolved Problem

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Posted on Thu Apr 30 2026 | 2:30 pm

DPoP closes a real gap in OAuth 2.0. Sender-constrained tokens are a meaningful upgrade over bearer tokens for any client that can implement them. But RFC 9449's silence on browser key storage creates the need for an architectural decision that each team must confront deliberately — there is no safe default that works everywhere.

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