Foundations of Blockchain

Transaction pool

All the unconfirmed transactions created by the user and other nodes are included in the transaction pool. The transaction pool could be a local file or an in-memory pool. We will maintain all the transactions in a list stored in memory:

transaction_pool = [] 

Whenever a transaction is created by a node, it is added to the local transaction pool before broadcasting. The following send_transaction method adds the transaction to the pool after creating the transaction:

def send_transaction(self, address, amount): 
    tx = create_transaction(address, amount, get_private_from_wallet(),     self.get_unspent_tx_outs(), get_transaction_pool()) 
    add_to_transaction_pool(tx, self.get_unspent_tx_outs()) 
    return tx 

These transactions remain in ...