I don't think this is correct. The signer creates and signs the i= value,
so it's not "garbage", and it can't be "false" either.
Perhaps the word "stable" would be more applicable. The d= value is
tied to the DNS, is relatively stable, and the verifier can check that
there's a key record in the DNS that matches the signature. The parts
of the i= beyond what's in the d= are just an assertion by the signer
with no semantics, verifiable or otherwise, and are no more useful
than any other unverified assertion.
R's,
John
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