Using a digital signature provides the strongest form of non-repudiation because it cryptographically binds each attendee's identity to their conference session join request. A video recording may show who appears on screen, but it can be edited or disputed. Showing a photo ID or replying to an email offers some assurance of identity, yet either can be forged or later denied. A properly implemented digital signature, backed by public-key infrastructure, is the most reliable way to prove an individual cannot repudiate their attendance.
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