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It is really worth information and i appreciate your effort to explain the topic . But again here it looks like telling about trade like based on capital investment. How about earnings by giving services and like signatures . where there will not be any inflow only earnings then How it will be calculated
by giving signature earning I guess you mean providing your signature space on rent
and no inflow only earnings I guess you mean payment in terms of bitcoin or virtual currency.
In this case income is earned only on realization of profits i.e. you won't consider payments you received in bitcoins
until you sell your bitcoins for INR.So hypothetically, if you earned even few crores through renting away your signature space (for of bitcoins) they are unrealized profits and will be realized only when you turn them into INR and you will be liable to pay taxes on that "income" only for the bitcoins you converted to INR.
I am too tired and trying my best to explain hope you understand what I am trying to say here.