unbound-control to display trust anchors?

[Jaap Akkerhuis]

 Stephane Bortzmeyer via Unbound-users writes:

 > Thanks, but it seems to work with very recent Unbounds only (the one
 > in Debian stable, or the one in Ubuntu LTS reply REFUSED).

Unbound 1.6.2, 24 april 2017:

Add trustanchor.unbound CH TXT that gets a response with a number of
TXT RRs with a string like "example.com. 2345 1234" with the trust
anchors and their keytags.