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I thought it was clear it ran through iCloud: https://support.apple.com/en-au/HT209460 https://support.apple.com/en-au/HT209460 It only works between devices s

I thought it was clear it ran through iCloud: https://support.apple.com/en-au/HT209460 https://support.apple.com/en-au/HT209460 It only works between devices signed in with the same Apple ID

jdsnape 3y ago
The encryption keys are shared via the iCloud keychain, but I think the actual sharing happens over a protocol called Companion Link.