Trait LnurlAuthSigner
pub trait LnurlAuthSigner {
    // Required methods
    fn derive_bip32_pub_key<'life0, 'life1, 'async_trait>(
        &'life0 self,
        derivation_path: &'life1 [ChildNumber],
    ) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, LnUrlError>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             Self: 'async_trait;
    fn sign_ecdsa<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        msg: &'life1 [u8],
        derivation_path: &'life2 [ChildNumber],
    ) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, LnUrlError>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait;
    fn hmac_sha256<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        key_derivation_path: &'life1 [ChildNumber],
        input: &'life2 [u8],
    ) -> Pin<Box<dyn Future<Output = Result<Vec<u8>, LnUrlError>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             Self: 'async_trait;
}