Copyrighting using Cubase

I’ve done physical copyrights in the past. Plan my next group of songs to go out to the copyright office electronically. I’m trying to figure out the best ways to attach multiple songs to send to the copyright office. I’ve got about 15 songs that need copyrighting. I was planning to create 32 bit mix down files and attach them to the email for the copyright office. Am I going about this in the right way? Suggestions.


32 bit is totally overkill…16bit 44.1k or mp3 will do the job.