Embodiments control submission of crowdsourced data from a computing device to a cloud service. The cloud service receives a packet from the computing device having collected data and a single-use data tag associated therewith. The single-use data tag represents one of a threshold quantity of single-use data tags issued to the computing device. The cloud service validates the single-use data tag in the received packet by, for example, searching for the single-use data tag in a tag store maintained by the cloud service. The collected data from the received packet is stored by the cloud service based on the validation. After validation, the tag store is updated to prevent re-use of the single-use data tag. In some embodiments, the cloud service is a location service receiving crowdsourced beacon fingerprint data from a plurality of mobile computing devices.