The SIP is there from the start for the 4 tokens mentioned. This will enable trading of the tokens as soon as they are introduced. The second the first LARYNX token (miner) is bought with Hive, that is broke up into the 3 parts and is part of the SIP forever.
It seems like that's something every tribe token should have going forward.
I imagine that will be available to every community on Hive. They will be able to create their own SIP with whatever token they have. It will have to be on the Spknetwork I would imagine.
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Considering what brofund and SPI are doing it a seems like that would be a natural evolution for those tribes in particular. I really should break down and try to tackle that lite paper.