fn verify(
env: soroban_sdk::Env,
signature_payload: soroban_sdk::Bytes,
key_data: soroban_sdk::Bytes,
sig_data: soroban_sdk::Bytes,
) -> bool
fn canonicalize_key(
env: soroban_sdk::Env,
key_data: soroban_sdk::Bytes,
) -> soroban_sdk::Bytes
fn batch_canonicalize_key(
env: soroban_sdk::Env,
keys_data: soroban_sdk::Vec,
) -> soroban_sdk::Vec