> ## 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.

# IB20Asset.announce

> Generated B20 reference for announce(bytes[],string,string,string).

[Related concept](/base-chain/specs/upgrades/beryl/b20/specification/concepts/variants-asset-vs-stablecoin)

## Signature

```solidity theme={null}
function announce( bytes[] calldata internalCalls, string calldata id, string calldata description, string calldata uri ) external;
```

| Field               | Value                                    |
| ------------------- | ---------------------------------------- |
| Selector            | `0x595135dd`                             |
| Canonical signature | `announce(bytes[],string,string,string)` |

## Description

Posts a holder-impacting announcement and atomically dispatches each entry in
`internalCalls` via self-`delegatecall` (preserving `msg.sender`). Emits
`Announcement` then `EndAnnouncement` with the same `id`. Pass an empty
`internalCalls` for a pure disclosure.
Dev: Reverts with `AccessControlUnauthorizedAccount` when the caller does not hold `OPERATOR_ROLE`.
Dev: Reverts with `AnnouncementIdAlreadyUsed` when `id` has previously been consumed.
Dev: Reverts with `InternalCallMalformed` when an entry in `internalCalls` is shorter than four bytes.
Dev: Reverts with `AnnouncementInProgress` when an entry in `internalCalls` targets `announce` itself.
Dev: An inner call that raises a Solidity `Panic` (e.g. arithmetic overflow) propagates the
raw Panic unchanged; any other inner revert wraps as `InternalCallFailed(call)`. An inner
out-of-gas halts the whole call.
Param: internalCalls ABI-encoded calldata blobs executed in order via self-`delegatecall`; may be empty.
Param: id            Caller-chosen announcement id; single-use over the token's lifetime.
Param: description   Human-readable summary of the announcement.
Param: uri           Off-chain URI containing the full announcement contents.

## Access control

`OPERATOR_ROLE` gates this Asset call.

## Policy interaction

No direct policy interaction.

## Example

```solidity theme={null}
IB20Asset(target).announce(arg0, arg1, arg2, arg3);
```

## Related

* [IB20Asset reference](/base-chain/specs/upgrades/beryl/b20/specification/reference/interfaces/IB20Asset)
* [Constants & addresses](/base-chain/specs/upgrades/beryl/b20/specification/reference/constants-and-addresses)