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A compact signed object needs one deterministic binary form and three explicit transport profiles. QR, NFC and Bluetooth LE fail in different ways when signature and key material cross their byte budgets.
When attributes require independent signatures, BBS can replace N signatures with one multi-message signature, but its selective-disclosure proof grows with every hidden message. The useful crossover depends on what the comparison actually carries.
A byte-level comparison of RSA, elliptic-curve, pairing-based and post-quantum signatures shows when recurring signature traffic overtakes key provisioning and storage.