You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: batched_grouped_ciphertext_validity.rs
    path of file: ./repos/solana/zk-token-sdk/src/instruction
    
    the code of the file until where you have to start completion: //! The batched grouped-ciphertext validity proof instruction.
//!
//! A batched grouped-ciphertext validity proof certifies the validity of two grouped ElGamal
//! ciphertext that are encrypted using the same set of ElGamal public keys. A batched
//! grouped-ciphertext validity proof is shorter and more efficient than two individual
//! grouped-ciphertext validity proofs.
//!
//! Currently, the batched grouped-ciphertext v
    
    fn new_transcript(&self) -> Transcript {
        let mut transcript = Transcript::new(b"BatchedGroupedCiphertextValidityProof");

        transcript.append_pubkey(b"destination-pubkey", &self.destination_pubkey);
        transcript.append_pubkey(b"auditor-pubkey", &self.auditor_pubkey);
        transcript.append_grouped_ciphertext_2_handles(
            b"grouped-ciphertext-lo",
            &self.grouped_ciphertext_lo,
        );
        transcript.append_grouped_ciphertext_2_handles(
            b"grouped-ciphertext-hi",
            &self.grouped_ciphertext_hi,
        );

        transcript
    }