slide_short3

import hashlib
import json
import time
from typing import Dict, List, Optional, Tuple

# Assuming you have access to the shorthash function and the required library has been imported
from slidechain import shorthash

class Block:
    def __init__(
        self, index: int, timestamp: int, data: str, previous_hash: str, nonce: int
    ):
        self.index = index
        self.timestamp = timestamp
        self.data = data
        self.previous_hash = previous_hash
        self.nonce = nonce
        self.payload_hash = self.compute_payload_hash()

    def compute_payload_hash(self) -> str:
        payload_string = json.dumps(self.data, sort_keys=True)
        return shorthash(payload_string.encode())  # Use the shorthash function for payload hashing

    def hash(self) -> str:
        block_string = json.dumps(
            {
                "index": self.index,
                "timestamp": self.timestamp,
                "payload_hash": self.payload_hash,
                "previous_hash": self.previous_hash,
                "nonce": self.nonce,
            },
            sort_keys=True,
        )
        return hashlib.sha256(block_string.encode()).hexdigest()

# Rest of the code remains the same.