The phrase "allegedly based on" is correct and usable in written English.
It can be used when discussing claims or assertions that are said to be derived from a particular source or inspiration, but without confirming the truth of that source.
Example: "The film is allegedly based on a true story, though many details have been fictionalized."
Alternatives: "reportedly derived from" or "supposedly inspired by".
The pivotal, though hazily defined, figure is Guy Littleton, a philanderer allegedly based on Ian Fleming.
The jury was told of the stories which subsequently appeared in the NOTW, allegedly based on the hacked voicemails.
Last week, a grisly account of the killing of Tello, allegedly based on jail house conversations, was revealed in court.
There was no discernible Dead content but plenty of sinuous melody in a long, modal, Greek-flavored improvisation allegedly based on "Uncle John's Band".
Grayling added: "Last week a national newspaper published a story allegedly based on a conversation that took place at a lunch following a privy council meeting.
His claims, allegedly based on unconfirmed intelligence that linked the attacks in America on September 11th 2001 to Iraq, later turned out to be baseless.
On the political front, Prime Minister Helen Clark responded to a post on leading local political blog On The House that ripped into the PM based on comments she allegedly made about journalists that had her saying that many journalists were "too young to remember history" and had wide gaps in their general knowledge.
Based on the relatively small sum Manafort allegedly spent on rugs, Smith added, they were likely intended for another purpose.
Petitioner contends that his conviction was based in part on evidence obtained by an allegedly unlawful search in violation of the United States Constitution.
But its assertions collapse when you examine the science on which they're allegedly based.
In a curious coincidence he was allegedly found on the Nepal border, just as Tunda, a Pakistan- based terrorist, was apparently found a couple of weeks ago.
