report_equivocation: TxDescriptor<
    {
        equivocation_proof: {
            equivocation: GrandpaEquivocation;
            set_id: bigint;
        };
        key_owner_proof: {
            session: number;
            trie_nodes: Binary[];
            validator_count: number;
        };
    },
>

Report voter equivocation/misbehavior. This method will verify the equivocation proof and validate the given key ownership proof against the extracted offender. If both are valid, the offence will be reported.