APNIC now supports "signing with resources". This is a RPKI-based mechanism to challenge & verify control over IP address (blocks) and AS numbers. Very useful for Bring-Your-Own-IP (BYOIP) use cases.

I helped develop this as an open standard & software implementation. Very nice to see it finally reach the production environment! Kudos to Team APNIC

https://orbit.apnic.net/hyperkitty/list/[email protected]/thread/AMIULYGZ3IIVSUY3PY6CYYA7NLZD647Z/