fn __check_auth(
env: soroban_sdk::Env,
signature_payload: soroban_sdk::BytesN<32>,
signature: WebAuthnSigData,
auth_contexts: soroban_sdk::Vec,
) -> Result<(), soroban_sdk::Error> Bind the account to one secp256r1 (WebAuthn) public key (65-byte uncompressed 0x04||x||y).
fn __constructor(env: soroban_sdk::Env, pubkey: soroban_sdk::BytesN<65>)