Probably this one: https://db.debian.org/fetchkey.cgi?fingerprint=58B66D48736BE...
Debian uses PGP signing pretty extensively, and maintain a keyserver (and separate search interface I used for this) for their keys: https://keyring.debian.org/
Debian uses PGP signing pretty extensively, and maintain a keyserver (and separate search interface I used for this) for their keys: https://keyring.debian.org/