Capsule for the preparation of a beverage from beverage ingredients contained therein, comprising a body (2) comprising at least one compartment for receiving said beverage ingredients and a flange-like rim (4) extending outwardly and transversally to a central axis (I) of said body; a membrane (6) for closing the opening which is sealed onto the flange-like rim, an optical code (7) containing binary information configured to be read by a camera (11) of a beverage producing device (20), wherein the optical code (7) is a two-dimensional barcode having rectilinear borders (7a-7d) and which is inscribed in a circular area (8) concentric relative to the centre (O) of the membrane having a radius (R) smaller than the radius (R 0 ) of the membrane.