Assertion: certificate's number | /r/HasProperty | unique
Facets:
value: for each certificate
type: OTHER
value: in all versions
type: OTHER
Source sentences:
text: In all versions, the serial number must be unique for each certificate issued by a specific CA (as mentioned in RFC 5280).
text: Since all certificates issued by a CA must contain unique serial numbers, and since both the precertificate and certificate will have the same serial number, it’s important to make one of them as invalid or not usable, thus the poison extension.