He completed the 138 nautical mile voyage from Cowes to Dinard in nine hrs three mins and six secs last month.
It has been acknowledged as the fastest single-handed crossing in a yacht less than 60 feet long by the World Sailing Speed Record Council.
"It's fantastic news and a great feeling to have an official world record under my belt," Sharp said.
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Sharp sailed his 40-foot Imerys yacht between the isle of Wight and northern France on 24 November, taking almost three hours off the previous record that had stood for 12 years.
"Imerys was on fire in these windy conditions. These latest Class 40's are seriously optimised racing machines, averaging speeds of 15 knots and surfing at over 20 knots," he said.
"It is still difficult to believe that Imerys managed to carve three hours off the previous time. Hopefully this sets the bar high enough to hold on to the record for some time at least."

Murray won 6-3 6-0 in 65 minutes to set up a final against world number one Novak Djokovic on Sunday (20:00 BST).
The result means the Scot will overtake Swiss Roger Federer in Monday's new ATP rankings and return to number two for the first time since 2013.
"It's good to get back close to the top," Murray said.
The US Open gets under way on 31 August, and it was following the same tournament last year that Murray lost his place in the top 10 after losing to Djokovic in the quarter-finals in New York.
"It's nice to get back especially after everything I went through last year with the hip surgery and dropping out of the top 10. A lot of questions were being asked about how my game was physically.
"I'll keep working hard and try to get that one spot higher."
Djokovic beat unseeded Frenchman Jeremy Chardy 6-4 6-4 in the first semi-final.
The Serb improved his record against Chardy to 10-0 with victory in one hour and 20 minutes, despite requiring several bouts of treatment on a sore right elbow.
"It comes and goes, now is not very pleasant," Djokvoic said of the problem. "Every day is a new day. I try to bury the pain, play with the pain, it is part of what we do."
Murray, 28, powered away from Nishikori, converting six break points and winning the last eight games in a row, including 12 of the last 13 points.
He now faces another chance to end a losing streak against Djokovic that stretches across eight matches back to the 2013 Wimbledon final.

Welsh cynghanedd group Carmarthen Bardic School is celebrating its 25th anniversary and hopes to publish a collection of poems written by past members.
It has helped train a number of National Eisteddfod winners including Mererid Hopwood, who tutors for the group, and Aneirin Karadog.
The lessons are held over a pint at the Carmarthen Quins Rugby Club.
Cynghanedd has bee present in Welsh language rhyming since the 6th Century, and developed into a complex set of poetic rules from about the 13th Century.
Geraint Roberts, one of the original members, said: "There's a very close correlation between the development of the Welsh language and cynghanedd.
"We set homework and that's a critical part of it - going over the homework, looking over mistakes and looking for ways of improving and developing."
One of its youngest members, 15-year-old Dafydd Llywelyn, said: "My forefathers learnt this craft and I want to keep the tradition alive."
Jersey-based sailor Phil Sharp's has had his single-handed cross-Channel record officially ratified.
[NEXT_CONCEPT]
Britain's Andy Murray swept past Kei Nishikori to reach the final of the Rogers Cup in Montreal and guarantee a return to second in the world rankings.
[NEXT_CONCEPT]
A group is calling on former members to contribute poems for a new book.