nd preservation, logs that such checks have been made, and any special tests that may be 
required for a particular AIP instance or class. 
AUDIT AND CERTIFICATION OF TRUSTWORTHY DIGITAL REPOSITORIES 
CCSDS 652.0-M-1 
Page 4-15 
September 2011 
4.2.9 The repository shall provide an independent mechanism for verifying the 
integrity of the repository collection/content. 
Supporting Text 
This is necessary to enable the audit of the integrity of the collection as a whole. 
Examples of Ways the Repository Can 