RE: Crowd funding initiative to build a Satoshi Nakamoto statue in Vienna, Austria 🤩

Copyright agreement with the artist who will be comissioned to build it. Simple. Have it set up by a lawyer if the plans are for publications as well, such as in books, magazines, selling t-shirts etc.
Otherwise, if it is in a public place, it is the so called Panoramafreiheit for photos - this link is in German, but look for it with Google under 'Monumentfreedom' for the english version.