Update 1/16/20: According to Namecheap, the issues with DNSSEC have been resolved as of 2:00am EST (11:00 PM PST).
Have a domain registered at Namecheap with DNSSEC turned on? Now might be a good time to check if it still resolves.
Since at least 11:21pm Eastern Standard Time (8:21pm Pacific Standard Time) today, DNSSEC for domain names on Basic/PremiumDNS has been broken. So far, the issue appears to be caused by an expired signing key, but according to the latest status update “there is no current timeline for resolution of this issue”. This happens to be a fairly serious issue as DNSSEC validation for affected domain names will fail and cause websites and services to become inaccessible to some users.
The full text of the status update is copied below. This post will be updated if the status of the incident changes.
We are currently experiencing temporary technical issues with DNSSEC for domain names on Basic/PremiumDNS. If your domain name has DNSSEC option enabled, it may cause DNS performance issues. Unfortunately, there is no current timeline for resolution of this issue. We will keep you updated on the progress. Meanwhile, please contact our Support Team for assistance and more details. Please accept our sincere apologies for the inconvenience. Thank you for your continued support and patience.
Oh well, maybe no one is using DNSSEC anyway.