Denisovan is the name given to an extinct sub-species of hominid(a). Their name is derived from the Denisova cave in the Altai mountains of Siberia. Only fragments of four individuals have been identified so far. While the first Denisovan remains were found in Siberia, there is now evidence that they were the earliest hominins on the Tibetan Plateau (b).
It has also been determined that they interbred with Neanderthals, a sister race.
It did not take long for the speculative history brigade to jump on this new bandwagon. Andrew Collins has now prepared for publication The Cygnus Key in which he claims to present “compelling evidence showing that the earliest origins of human culture, religion, and technology derive from the Denisovans, the true creators of the lost civilization long known to exist but never before proved.”
*In 2019, Collins co-authored Denisovan Origins  with Greg Little in which they combine their speculative abilities to produced a full book on the physical and intellectual attributes of the Denisovans, based on a few bone fragments! The book received the imprimatur of Graham Hancock, so the collective name recognition value of Collins, Hancock and Little should boost sales. Jason Colavito has critiqued this volume(c), highlighting the amount of dubious material that the authors have previously published is included in this offering.*
This comment is nearly identical to that expressed by the late Colin Wilson relating to the Neanderthals whom he claimed had possessed highly sophisticated mathematical and astronomical knowledge and were precursors of the Atlantis civilisation. This extremely speculative assertion is made in Wilson’s Atlantis and the Kingdom of the Neanderthals.