def get_block_height(block_hash, coin_symbol='btc', api_key=None):
    '''
    Takes a block_hash and returns the block_height
    '''
    return get_block_overview(block_representation=block_hash,
            coin_symbol=coin_symbol, txn_limit=1, api_key=api_key)['height']
Takes a block_hash and returns the block_height