Each F/P recording stores all the information needed for verification, including metadata, signatures, and sensor data. To verify a F/P recording, simply open it in the F/P App and click Verify (note: this requires an internet connection so that the F/P Server can be consulted for signature and timestamp validity). You can use any common file sharing method to exchange recordings -- though some systems may re-encode the recording which will destroy the F/P side-channels.
NOTE: Absolutely no personal information or any of the content of your recording is shared with the F/P Server. The only information shared and stored is:
your chosen username and your F/P public key -- a public cryptographic key generated for you by the F/P App. The private key is stored only on your phone.
Start and Stop Timestamps for each recording, as well as a cryptographic digest of the recording contents, and a cryptographic signature from the F/P App Key and from your F/P User Key.