Fix security issue: No longer possible to steal someone's channel by forging request from scanned QR code. Attacker cannot register same challenge, he will now receives 409. Caveat: When user loose connection, new challenge is generated.
Fix security issue: No longer possible to steal someone's channel by forging request from scanned QR code. Attacker cannot register same challenge, he will now receives 409. Caveat: When user loose connection, new challenge is generated.

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