Here's the old thread on it:

https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2016-January/012194.html

Probably is more timely now to discuss.

Pretty sure this would be working with lightning also.

See also, related (original) CT discussion (lots of info, rabbithole):
https://bitcointalk.org/index.php?topic=1085273.0
and, in Elements, see:
https://bitcointalk.org/index.php?topic=1085271.0

Discuss