Ironic isn't it? The most useful service and (... no seeds, no stems, no sticks))) nobody knows nothing about the way they operate. They gotta use something to generate btc wallet addresses for the registered users aren't they?
Of course they do... but it is a proprietary, closed-source system. So it isn't at all strange that no one knows what they're doing or how they're doing it outside of the coinbase development team 