Load the header chain from disk.
        Each chain element will be a dictionary with:
        *

def load_header_chain( cls, chain_path ):
        """
        Load the header chain from disk.
        Each chain element will be a dictionary with:
        * 
        """

        header_parser = BlockHeaderSerializer()
        chain = []
        height = 0
        with open(chain_path, "rb") as f:

            h = SPVClient.read_header_at( f )
            h['block_height'] = height 

            height += 1
            chain.append(h)

        return chain