> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-add-b20-spec.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# IB20.renounceLastAdmin

> Generated B20 reference for renounceLastAdmin().

[Related concept](/base-chain/specs/upgrades/beryl/b20/specification/concepts/roles-and-access-control)

## Signature

```solidity theme={null}
function renounceLastAdmin() external;
```

| Field               | Value                 |
| ------------------- | --------------------- |
| Selector            | `0x6f79e3d7`          |
| Canonical signature | `renounceLastAdmin()` |

## Description

Permanently transitions the token to a zero-admin state. Revokes `DEFAULT_ADMIN_ROLE`
from `msg.sender`. Emits `RoleRevoked(DEFAULT_ADMIN_ROLE, msg.sender, msg.sender)` and
`LastAdminRenounced(msg.sender)`.
Dev: Reverts with `AccessControlUnauthorizedAccount` when `msg.sender` does not hold `DEFAULT_ADMIN_ROLE`.
Dev: Reverts with `NotSoleAdmin` when other accounts also hold `DEFAULT_ADMIN_ROLE`.

## Access control

Uses the B20 access-control role graph. Factory initCalls bypass role gates during creation.

## Policy interaction

No direct policy interaction.

## Example

```solidity theme={null}
IB20(target).renounceLastAdmin();
```

## Related

* [IB20 reference](/base-chain/specs/upgrades/beryl/b20/specification/reference/interfaces/IB20)
* [Constants & addresses](/base-chain/specs/upgrades/beryl/b20/specification/reference/constants-and-addresses)