`Finally, the REST API used to communicate with remote calendars doesn't currently attempt to provide any privacy, although it could be modified to do so in the future (e.g. with prefix filters).`

[Benjamin-Loison]

https://github.com/opentimestamps/opentimestamps-client/blob/185a5997cf315402747223a1feae18e669ae08f2/README.md?plain=1#L122-L124