Struct Config 

pub struct Config {
    pub context: Bytes,
    pub kid: u64,
    pub secret: [u8; 32],
}

What the application distributes over its own authenticated channel.

Fields

context: Bytes

Opaque bytes both ends agree on as the broadcast’s end-to-end identity.

kid: u64

Selects among the credentials the application retains; rotating the secret is a new kid.

secret: [u8; 32]

32 bytes from a cryptographically secure random generator.