With reference to the evolution of ancient Indian numismatics, what major monetary transition occurred within the Gangetic valley as regional Mahajanapadas merged into the Magadhan empire?

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Before total imperial centralizing, independent Mahajanapadas issued localized punch-marked variants. Magadha and Kashi initially circulated heavy silver pieces based on a forty-ratti metric known as the Vimsatika. As Magadha achieved total territorial supremacy under the Nandas and Mauryas, they enforced a uniform weight standard based on thirty-two rattis, institutionalizing the standard Karshapana across the subcontinent.

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