Just minted three Bitcoin Inscriptions featuring DOI-linked versions of Grigori Perelman's core papers—the three landmark preprints that form the heart of his proof of the Poincaré Conjecture (and, more broadly, Thurston’s Geometrization Conjecture). Perelman never formally published his work in traditional journals. Instead, he directly uploaded these three groundbreaking preprints to arXiv. Together, they represent one of the greatest achievements in the history of mathematics. For this, he was awarded the Fields Medal—which, famously, he declined.