"Manifest verifiers MUST be able to handle number values up to 20 octets."
"Manifest verifiers MUST be able to handle number values up to 20 octets."

http://tools.ietf.org/html/rfc6486#section-4.2.1

rhansen/rpstir,rhansen/rpstir,rhansen/rpstir,rhansen/rpstir,rhansen/rpstir