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I dont think that is an 'official term' but to explain from what I understand. On both bitshare and smartcash if you can do some 'work' that is of benefit to the platform you can submit a workers proposal to get paid with that coin. If you proposal is accepted then 'community' coins are used to pay for the work. I know with smartcash a portion of all mined is put into a community pool for workers payments

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