A fast and most simplest block parser would be one  that extracts HASH160 values from Bitcoin transactions can and be useful for specific applications. Here's a simple Python script that demonstrates how to achieve this using the bitcoinlib library, which provides a convenient way to work with Bitcoin data:

from bitcoinlib.blocks import get_block
from bitcoinlib.transactions import read_hex, parse_signed_hex

# Replace with the block height or block hash you want to parse
block_hash_or_height = "block_hash_or_height_here"

# Get the block data
block = get_block(block_hash_or_height)

# Iterate through the transactions in the block
for tx in block.transactions:
    # Iterate through the outputs of each transaction
    for output in tx.outputs:
        # Check if the output script is of type HASH160
        if output.script.is_hash160:
            # Get the HASH160 value as a hexadecimal string
            hash160_hex = output.script.address()
            print(f"HASH160: {hash160_hex}")

Make sure to install the bitcoinlib library using pip (pip install bitcoinlib) before running this script. Also, replace "block_hash_or_height_here" with the actual block hash or height you want to parse.

This script fetches the block data and iterates through its transactions and outputs, checking if each output's script is of type HASH160. If so, it extracts the HASH160 value as a hexadecimal string and prints it.

Keep in mind that this is a basic example, and depending on your specific needs, you may want to add error handling and additional features.