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    validate_statement: RuntimeDescriptor<
        [
            source: Enum<
                { Chain: undefined; Local: undefined; Network: undefined },
            >,
            statement: {
                channel?: FixedSizeBinary<32>;
                data?: Binary;
                decryption_key?: FixedSizeBinary<32>;
                num_topics: number;
                priority?: number;
                proof?: Enum<
                    {
                        Ed25519: {
                            signature: FixedSizeBinary<64>;
                            signer: FixedSizeBinary<32>;
                        };
                        OnChain: {
                            block_hash: FixedSizeBinary<32>;
                            event_index: bigint;
                            who: FixedSizeBinary<32>;
                        };
                        Secp256k1Ecdsa: {
                            signature: FixedSizeBinary<65>;
                            signer: FixedSizeBinary<33>;
                        };
                        Sr25519: {
                            signature: FixedSizeBinary<64>;
                            signer: FixedSizeBinary<32>;
                        };
                    },
                >;
                topics: FixedSizeArray<4, FixedSizeBinary<32>>;
            },
        ],
        ResultPayload<
            { max_count: number; max_size: number },
            Enum<
                { BadProof: undefined; InternalError: undefined; NoProof: undefined },
            >,
        >,
    >

    Validate the statement.