Is there a way to store the UUID's (universally unique identifier (UUID)) of the devices used by a visitor in his/her contact record?
A universally unique identifier (UUID) is a 128-bit number used to identify information in computer systems.
There's no need for a UUID (the universal part in Marketo) because you already have a locally unique ID, the Lead ID.
There's no single, permanent device UUID known to Marketo, nor could there be because of browser privacy restrictions. But if someone has only one Munchkin Cookie ID (their cookies have not yet been cleared) then the Cookie ID + Lead ID constitutes a locally unique identifier.
You could of course generate a GUID v4 in JS and assign that to the lead, but it wouldn't be guaranteed to persist across browser sessions, hence would not be "the" UUID for that device.
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