> ## Documentation Index
> Fetch the complete documentation index at: https://base-a060aa97-docs-sync-code-change-be6d045.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).

<Warning>
  The `docs/B20/Asset.md` source file that previously documented the Asset variant (including announcements) has been removed as part of a documentation restructure. This reference page reflects the last verified interface state.
</Warning>

## Signature

```solidity IB20Asset.sol 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.

Reverts with `AccessControlUnauthorizedAccount` when the caller does not hold `OPERATOR_ROLE`.
Reverts with `AnnouncementIdAlreadyUsed` when `id` has previously been consumed.
Reverts with `InternalCallMalformed` when an entry in `internalCalls` is shorter than four bytes.
Reverts with `AnnouncementInProgress` when an entry in `internalCalls` targets `announce` itself.
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.

## Parameters

| Parameter       | Type               | Description                                                                         |
| --------------- | ------------------ | ----------------------------------------------------------------------------------- |
| `internalCalls` | `bytes[] calldata` | ABI-encoded calldata blobs executed in order via self-`delegatecall`; may be empty. |
| `id`            | `string calldata`  | Caller-chosen announcement id; single-use over the token's lifetime.                |
| `description`   | `string calldata`  | Human-readable summary of the announcement.                                         |
| `uri`           | `string calldata`  | Off-chain URI containing the full announcement contents.                            |

## Access Control

`OPERATOR_ROLE` gates this call.

## Policy Interaction

No direct policy interaction.

## Example

```solidity Usage Example theme={null}
// Disclose and schedule a 2:1 forward split, effective at the ex-date.
bytes[] memory calls = new bytes[](1);
calls[0] = abi.encodeCall(IB20Asset.updateUIMultiplier, (2e18, exDateTimestamp));

IB20Asset(token).announce({
    internalCalls: calls,
    id: "2026-Q3-split",
    description: "2:1 forward split, effective at ex-date",
    uri: "https://disclosures.example.com/..."
});
```