rollup.emitNotice

Emits a notice — a verifiable statement of fact about the application state, with no on-chain action attached. Off-chain consumers can validate a notice against the application's settled output root instead of re-executing the machine.

Encoded on-chain as Notice(bytes) and added to the outputs merkle tree (provable).

Usage

const index = rollup.emitNotice(
    Buffer.from(JSON.stringify({ matchId: 42, winner: "0xf39F…2266" })),
);

Returns

bigint — the output index among all provable outputs ever emitted by the application.

Parameters

payload

• Type: BytesLike — 0x-prefixed hex string, Buffer or Uint8Array
• Required

The attested data. Application-defined format — JSON, ABI-encoded structs, hashes, anything your consumers can decode.

Errors