The future of governance, sustainability, and technological innovation reimagine through BioKulture Systems Design that prioritizes self-determination, ethics, ongoing Free, Prior Informed Consent (FPIC), Indigenous Embassy, reciprocal accountability, and responsibility. For Indigenous Peoples, sovereignty is deeply intertwined with the data lifecycle (data maturity)—a relational resource that reflects their [bio]cultural, ecological, and spiritual identities. Indigenous Data Sovereignty (IDSov) and Indigenous Data Governance (IDGov) challenges prevailing data commodification and extraction paradigms in the digital swamp and "open" data paradigms by asserting the right to control, manage, and use data in ways that legitimize millennial-old Indigenous Research and Development (R&D) traditions that have profoundly informed contemporary science and technology and honor Indigenous worldviews/cosmology, affirming legitimacy deeds and titles to its metadata sources. This statement highlights how IDSov and IDGov principles can safeguard knowledge systems, sovereignty, and operationalize biocultural governance, contributing to global Indigenous sustainability goals and targets by 2050. This contribution examines the transformational potential of data legitimacy deeds and titles (i.e., fiduciary jurisprudence), how BioKulture Engineering, shaped by nature-culture agency, can realize social-ecological futures and sovereign bio/data economy participation.