"A client-side library" -- which hard-codes URLs, (owned by the Marcus family / LightSpark) -- such that your unsuspecting users find that all of their transactions, along with their user-agents and I.P. addresses -- are exclusively shared with this one, centralized server, run by a Lighting "compliance" company.

Please see image below...

And on github... https://github.com/breez/spark-sdk/blob/main/crates/internal/src/config.rs