The i3-MARKET project addresses the growing demand for a single European Data Market Economy by innovating marketplace platforms, demonstrating with industrial implementations that the data economy growth is possible. i3-MARKET proposal provides technologies for trustworthy (secure and reliable), data-driven collaboration and federation of existing and new future marketplace platforms, special attention on industrial data and particularly on sensitive commercial data assets from both SMEs to large industrial corporations is taken.It is well known that despite various research and innovation attempts working on Big Data Management, of Personal and or Industrial Data Integration and Security, there is no broadly accepted trusted and secure data marketplace. i3-MARKET will address this by developing lacking technologies and solutions for a trusted (secure, self-governing, consensus-based and auditable), interoperable (semantic-driven) and decentralised (scalability) infrastructure, called i3-MARKET Software Framework also named i3-MARKET Backplane, that enables federation via interoperability of the existing and future emerging data spaces and marketplaces. The i3-MARKET backplane introduces data monetisation in the form of Intelligent Data Economy services to formerly closed systems to offer and share data and lowering the market entry barriers for stakeholders – especially SMEs – to trade their data assets with the aim to ignite a flourishing data economy that fosters innovation and business in Europe. i3-MARKET focuses on the desired levels of privacy and confidentiality that support both legal and user-desired control and transparency for sharing data among relevant systems and services. The i3-MARKET backplane pays special attention in regulatory aspects around sensitive data assets developing the required security and access control measures that enable secure trading of data including support for automated contracting following European regulation (GDPR).