What would be a good universal icon for
attest / endorse / recommend / second that?

Here are some thought starters.

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Feels like 6 and 7 are the most obvious at first glance, but 13 feels really compelling. The issue with the check is that it’s a bit confounding to me as “message read” and * feels like “add a footnote” which aligns with the concept of an attestation

internet versioning:
v1: information protocol – http://
v2: social protocol – @
v3: trust protocol – *

Is asterisk a good symbol in this context?

(note: accessible symbol on mobile)

I've been thinking a lot about asterisk as a symbol. 

rafa* — verified
rafa* — see more / references / links / sources

It's simple and accessible on keyboard.

The other note is that “verified” mark is one of the many outcomes of the attestation action,,, so the check seems like it should be reserved as a badge — while the action is what needs an icon

I've been thinking a lot about asterisk as a symbol. 

rafa* — verified
rafa* — see more / references / links / sources

It's simple and accessible on keyboard.

https://warpcast.com/ting/0x64ed882c