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    submit_native_offline_payment: TxDescriptor<
        {
            amount: bigint;
            nullifier: FixedSizeBinary<32>;
            proof: Binary;
            recipient: SS58String;
            sender: SS58String;
        },
    >

    Submit a native token offline payment ZK proof for settlement.

    Same ZK circuit as CC payments, but uses a sentinel CID hash (blake2_256(b"encointer-native-token")) and transfers native currency via T::Currency::transfer().