+ Result_SignDecodeErrorZ ret_hu_conv = Result_SignDecodeErrorZ.constr_from_ptr(ret);
+ return ret_hu_conv;
+ }
+
+ public Result_RecoverableSignatureNoneZ sign_invoice(Uint8Array invoice_preimage) {
+ number ret = bindings.KeysInterface_sign_invoice(this.ptr, invoice_preimage);
+ Result_RecoverableSignatureNoneZ ret_hu_conv = Result_RecoverableSignatureNoneZ.constr_from_ptr(ret);