code: def get_broadcast_transaction_hashes(coin_symbol='btc', api_key=None, limit=10):
      '''
      Warning, slow!
      '''
      transactions = get_broadcast_transactions(
              coin_symbol=coin_symbol,
              api_key=api_key,
              limit=limit,
              )
  
      return [tx['hash'] for tx in transactionsf get_broadcast_transaction_hashes(coin_symbol='btc', api_key=None, limit=10):
      '''
      Warning, slow!
      '''
      transactions = get_broadcast_transactions(
              coin_symbol=coin_symbol,
              api_key=api_key,
              limit=limit,
              )
  
      return [tx['hash'] for tx in transactions]
docs: Warning, slow!