Green hydrogen, produced through electrolysis using renewable energy, is gaining momentum as a key player in global decarbonisation efforts. To ensure the environmental integrity of green hydrogen production, regulations and certifications are essential. Challenges include verifying the exclusive use of renewable electricity at large scales and across regions. The establishment of certifying agencies is crucial to define green hydrogen standards, track energy sources, and oversee international trade. There is a need for harmonised global standards to certify green hydrogen, given differing national regulations and grid integration levels. Initiatives like the EU's Clean Hydrogen Alliance and CertifHy system are pioneering efforts in creating regulatory frameworks for green hydrogen. Efforts towards establishing a global certifying body for green hydrogen, akin to IRENA, highlight the importance of international cooperation in shaping the future of sustainable energy.