This is not a spelling question but a pronunciation one.
When saying the word ["]blessed["], when do we pronounce it as spelled [?] and when do we pronounce it as ["]bles-said["], as in the Hail Mary[?]
Writing strictly, the exceptional "
-ed"
pronunciation should be indicated by a
grave accent placed over the "e" under discussion, thus "
-èd", to distinguish it from the "-d" or "-t" pronunciations). It'd be incorrect to use an
acute accent, because that properly marks the emphasized syllable, which remains the first one.
U.S. English typically spells words without using any accent marks (
harrrummmph!), except those that appear in words of foreign origin, altho' not in many French words imported by the successful invaders from Normandy in 1066.
It's technologically intriguing that typewriters achieved widespread manufacture & use with the accent-
free (i.e., accentless, for readers who feel deprived) keyboards of the U.S.A.