submit_report_dispute_lost: RuntimeDescriptor<[dispute_proof: {
    kind: SlashingOffenceKind;
    time_slot: {
        candidate_hash: FixedSizeBinary<32>;
        session_index: number;
    };
    validator_id: FixedSizeBinary<32>;
    validator_index: number;
}, key_ownership_proof: Binary], boolean>

Submit an unsigned extrinsic to slash validators who lost a dispute about a candidate of a past session. NOTE: This function is only available since parachain host version 5.