fn revoke(env: soroban_sdk::Env, attestor: soroban_sdk::Address)
fn authorize(env: soroban_sdk::Env, attestor: soroban_sdk::Address)
fn is_attestor(env: soroban_sdk::Env, attestor: soroban_sdk::Address) -> bool
fn __constructor(env: soroban_sdk::Env, admin: soroban_sdk::Address)