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: chunk_redeem_req.rs
    path of file: ./repos/CYFS/src/component/cyfs-chunk/src/proof
    
    the code of the file until where you have to start completion: use serde::{Serialize, Deserialize};
use ffs_base::{Peerid, Chunkid, BuckyResult, BuckyError, PeerSecret, PublicKey, SIGNATRUE_LENGTH};
use bdt2::crypto_tool::{PeerSecretImpl, PublicKeyImpl};
use time::Timespec;
use log::*;

use crate::ChunkProofReq;
use crate::chunk_base::*;

// Miner提交证明兑换信息
#[derive(Serialize, Deserialize)]
pub struct ChunkRedeemReq {
    pub source_device_id: Peerid, 
    pub mi
    
    fn verify_sign(&self, miner_public_key: &PublicKey)->bool {
        let buffer  = [
            self.source_device_id.to_string().as_bytes(),
            self.miner_device_id.to_string().as_bytes(),
            self.client_device_id.to_string().as_bytes(),
            self.chunk_id.to_string().as_bytes(),
            &self.session_id.to_ne_bytes(),
            &self.timestamp_sec.to_ne_bytes(),
            &self.timestamp_nsec.to_ne_bytes(),
            self.proof.as_bytes(),
        ].concat();

        let ret = sign_from_string(&self.sign);
        if let Err(_e) = ret {
            return false;
        }
        let mut sign_bytes = ret.unwrap();
            
        return miner_public_key.verify_md5(&buffer, &mut sign_bytes);
    }