ecdsaverify(1) on Linux
The text a5ec5bb9e0c3, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
ECDSA verification
Flags it lists
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-p -
-s