おつです
$ :| openssl s_client -connect keybase.io:443 > /dev/null
depth=2 C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
verify return:1
depth=1 C = GB, ST = Greater Manchester, L = Salford, O = Sectigo Limited, CN = Sectigo RSA Domain Validation Secure Server CA
verify return:1
depth=0 CN = keybase.io
verify return:1
DONE
$ :| openssl s_client -connect keybase.io:443 -showcerts 2>/dev/null | openssl x509 -noout -enddate
notAfter=Jun 9 23:59:59 2025 GMT
