stacks.js: Unable to access hub_info on Tor browser

Describe the bug On Tor browser, user can’t sign up or sign in to https://brace.to. We’ve received an error below.

XHR GET https://hub.blockstack.org/hub_info 403 Forbidden

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://hub.blockstack.org/hub_info. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

To Reproduce Steps to reproduce the behavior:

1. Using Tor browser, go to https://brace.to
2. Click on Get Started button -> Get your Secret Key -> I’ve saved it -> I’ve backed up my Secret Key
3. See the error

Screenshots

Additional context We believe it’s about Cloudflare blocking Tor nodes because of too much requests/strange behaviors. We can access https://hub.blockstack.org/hub_info directly on any browser but on Tor browser, we get security check hCaptcha shown below.

We’ve tried changing Tor nodes by click new circuit button without success. Can you help? It would be great if our apps can be used on Tor browser. Thank you so much.