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

> function generate_ operation_ auth_ message(blockchain_ rid: byte_ array, op: gtx_ operation): text Creates message from operation name and arguments. It i

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

FUNCTION

# generate\_operation\_auth\_message

```signature
function generate_operation_auth_message(blockchain_rid: byte_array, op: gtx_operation): text
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/core/auth/module.rell#lines-373)

Creates message from operation name and arguments. It is used when `evm_auth` is used to
authenticate a user, but auth message is not specified in the auth handler of the operation.

The message will contain the operation name and all parameters, formatted in a way that
favors readability of every parameter. It is not expected to be a sensible message for
end users to read, as the parameters will not have a label identifying what they represent.

**Parameters**

* **blockchain\_rid** — the RID of the blockchain we're on
* **op** — the operation that needs to be signed

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