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Here's the proposed solution in a nutshell.
The location database is a replicated, distributed database which maps resource names to current locations where those resources can be found.
SONAR is a service that helps an application find which of several servers are closer than others.
Integrity checks mean strong cryptographic hash functions, such as MD5 or SHA. Resource descriptions contain a strong hash of the file being replicated, and are signed so that a user can tell whether a replicated copy of a resource is both authentic and intact.
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