M2M by MatchCoin modernises word-of-mouth advertising through digitalisation and brings it into the 21st century with an innovative platform. Users benefit from personalised recommendations based on shared interests, mediated by community-based keywords. This is the hashtag 4.0 Our technology, the Zero-Knowledge-Proof, guarantees privacy and security by allowing users to share information without revealing personal data. This represents a revolutionary form of data monetisation that puts users back in control of their information and rewards them for their contributions. Unlike traditional advertising models that commercially exploit user data, M2M promotes a culture of transparency of value and mutual benefit. We aim to change the dynamics of digital advertising by prioritising authenticity and personal value. M2M is more than just a platform - it is decentralised data.