=> https://gist.mills.io/prologic/194993e7db04498fa0e8d00a528f7be6
e.g: (_turns out @xuu is right about Blak2b being easy/simple too!_):
$ printf "%s\\t%s\\t%s" "https://example.com/twtxt.txt" "2024-09-29T13:30:00Z" "Hello World!" | b2sum -l 32 -t | awk '{ print $1 }'
7b8b79dd
=