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The #OpenBSD #signify keys for the 6.5 release are:
base: RWSZaRmt1LEQT9CtPygf9CvONu8kYPTlVEJdysNoUR62/NkeWgdkc3zY
fw: RWQYdGVtTv5IvpH2c+TLQAC4iV7RjoGZ/v75q8MCuC9Mca7nFVCXRefy
pkg: RWS5D4+188RI6jULDOFzga0Cm1zrXYUAHT6xu0mLrZidbn6xrMB5aZeR
syspatch: RWT8U2yd3Aq5DnetILjmSoCQxmyt3VqfGS7GBh19oh4Xre4ywc31PEpw
And a screenshot of the 65.html web page
the 6.5 keys are also included in 6.4, so you can confirm they are correct if you are upgrading.
6.6 keys are also included in 6.5:
untrusted comment: openbsd 6.6 base public key
RWSvK/c+cFe24BIalifKnqoqdvLlXfeZ9MIj3MINndNeKgyYw5PpcWGn