# is_auth_op · FT4 Rell API · Chromia Docs (concept)

> function is_ auth_ op(op: gtx_ operation): boolean Verifies whether the operation passed is an auth operation, that is one of: EVM_AUTH_OP FT_AUTH_OP Param

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.core.auth/is_auth_op/

FUNCTION

# is\_auth\_op

```signature
function is_auth_op(op: gtx_operation): boolean
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/authentication.rell#lines-785)

Verifies whether the operation passed is an auth operation, that is one of:

* `EVM_AUTH_OP`
* `FT_AUTH_OP`

**Parameters**

* **op** — the operation to check

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/lib.ft4.core.auth/is_auth_op.html)Generated API reference, mirrored from the live docs