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The channels could be maintained by a third party entity, which charges a small fee for each access through a token. The data source provider could give out these tokens when it allows a data consumer permission to access its channel. In return, the third party entity serves as a neutral party tasked with keeping up the operations of the data channel.
This general architecture could be used for a variety of business data integrations, specifically the ones from Carbon Accounting and Certification Minimum Viable Product (MVP).
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