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

> @mount("ft4.delete_ auth_ descriptors_ for_ signer")
operation delete_ auth_ descriptors_ for_ signer(signer: byte_ array) Deletes all auth descriptors fro

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/lib.ft4.external.accounts/delete_auth_descriptors_for_signer/

OPERATION

# delete\_auth\_descriptors\_for\_signer

```signature
@mount("ft4.delete_auth_descriptors_for_signer")
operation delete_auth_descriptors_for_signer(signer: byte_array)
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/lib/ft4/external/accounts/operations.rell#lines-103)

Deletes all auth descriptors from an account for which the provided signer is included in
the signers array.

Must be signed by an auth descriptor with `accounts.auth_flags.ACCOUNT`.

*Note:* Deleting an auth descriptor using this operation will delete the auth
descriptor from every account it is associated with.

If any of the matched auth descriptors happens to be the main auth descriptor of any account,
this operation will fail.

Throws `"UNSUPPORTED SIGNER"` if the signer's size does not match either:

* `EVM_ADDRESS_SIZE` length of 20 bytes
* `FT_PUBKEY_SIZE` length of 33 bytes

**Parameters**

* **signer** — the signer for which to delete auth descriptors

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