The main objective of this research study is to offer a systematic analysis of consent in minors and the processing of personal data under the General Data Protection Regulation and the Organic Law on the Protection of Personal Data and the Guarantee of Digital Rights. Specifically, besides studying consent in depth, as a fundamental legal basis, we dissect the essential contours of the e-signature as the most suitable instrument for guaranteeing the provision of this consent, focusing on the special features that this presents when those who intervene as controllers are Public Administrations.