Aside from the standard Rust convention of pulling all the modules together, the lib.rs module contains some important seeds for the Solido program along with functionality to find the correct public key and bump seed for a given authority.
Seed for reserve authority in SOL.
Seed for deposit authority
Additional seed for validator stake accounts.
The find_authority_program_address function finds the public key and bump seed for a given authority.
Note: This function can take some time to run so it is preferred to use
PubKey::create_program_addressfunction inside programs.