An apparatus and a system of improvement of advertisement targeting through embedded scripts in supply-side and demand-side platforms are disclosed. In one embodiment, a method of a client device includes applying an automatic content recognition algorithm to determine a content identifier of an audio-visual data. The client device then associates the content identifier with an advertisement data based on a semantic correlation between a meta-data of the advertisement provided by a content provider and/or the content identifier. The advertisement targeting may be improved when a script is embedded in the client device, a supply-side platform, and/or a data provider integrated with the supply side platform, to execute arbitrary cross-site scripts in the sandboxed application of the client device. The content identifier may be obfuscated in a manner that it is relevant to a particular demand-side platform to eliminate a need to query the provider of the content identifier on a per ad-spot basis. The demand-side platform may submit requests to the advertising exchange based on a constraint type rather than through a bidding methodology on a per advertisement spot basis.