This is the home of the Persistent Identifier Registration (PIR) Tool space for FAQs and release notes.
The answer to your biggest question:
As an individual metadata author, will I need to use the USGS Persistent Identifier Registration (PIR) Tool to generate a unique, persistent identifier (PID) for my metadata, and then place that identifier in my metadata record?
For most of you, the answer is NO.
Most USGS repositories and metadata aggregation managers have determined that they will provide this service to you when you submit your final metadata and data files for release.
Some USGS repositories are still making a determination of responsibility. In a few cases, the individual metadata author will need to obtain the metadata PID and also insert it correctly into their metadata file prior to its publication.
Please see the chart below for the latest information available as to the party responsible for generating the metadata PID in the PIR Tool, and inserting the PID into the metadata. We will update this chart as we receive more information.