Re: Bits of this are really cool
What's weird is I was actually reading about the memory key thing on the IBM  (or something near there, from the 1970s)
This Oracle SSM tagging is just a baby version of a capability architecture, and they've been around since the 1970s at least.
The Burroughs B5000 had single-bit tagged memory, in 1961. The B6500 had 3-bit tags in 1969. The IBM AS/400 had1 16-byte (128-bit) pointers that included type information and validation, in 1988. Oracle is a little late to this party.
1And has, since it lives on as IBM's i systems.