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    offchain_worker: RuntimeDescriptor<
        [
            header: {
                digest: DigestItem[];
                extrinsics_root: FixedSizeBinary<32>;
                number: number;
                parent_hash: FixedSizeBinary<32>;
                state_root: FixedSizeBinary<32>;
            },
        ],
        undefined,
    >

    Starts the off-chain task for given block header.