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_create_delegate_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, Chu
    
    pub fn verify(&self, source_public_key:&PublicKey)->bool{

        let buffer  = [
            self.source_device_id.to_string().as_bytes(),
            self.miner_device_id.to_string().as_bytes(),
            self.chunk_id.to_string().as_bytes(),
            &self.balance.to_be_bytes(),
            &self.price.to_ne_bytes(),
        ].concat();

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