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Understanding Bitcoin Core Log Messages
When running the bitcoin core, two specific log messages are printed to the console during debug mode. These logs provide valuable insights into the functioning of the Bitcoin network. In this article, we’ll delve into the differences between these two log messages and what they indicate when running Bitcoin Core version 28.0 with debug=1.
TransactionAddedToMempool
The first log message is:
[validation] TransactionAddedToMempool
This message is printed by the transaction-validation layer, which is responsible for verifying transactions on the blockchain. The [validation] tag indicates that this message is related to validation of a transaction.
When a new transaction is added to the mempool (the pool of waiting transactions), it undergoes various checks, including:
- Validation: Transactions are verified against multiple rules and conditions, such as checksums, script hashes, and data integrity.
- Sorting
: The transaction is sorted based on its priority, which determines how soon it can be broadcast to the network.
If a transaction passes these checks without errors, it is added to the mempool. This process continues until a valid transaction is found or all waiting transactions are rejected.
Mempool
The second log message is:
[mempool] ...
This message is printed by the mempool-operations layer, which is responsible for managing and manipulating transactions in the mempool. The [mempool] tag indicates that this message is related to operations on the mempool.
When a transaction is added to the mempool, it may need to be:
- Queued: Wait until it’s available for mining.
- Forked: Becomes a new fork if the previous one fails or becomes orphaned.
- Bloom-forked: If the transaction has been rejected by the validation layer and is not in a valid state.
These operations are performed to ensure that waiting transactions remain active on the network, preventing them from being lost forever.
Comparison and Conclusion
When running Bitcoin Core version 28.0 with debug=1:
- The first log message (
TransactionAddedToMempool) indicates that a new transaction has been added to the mempool for validation.
- The second log message (
Mempool) shows operations related to managing transactions in the mempool, including queueing, forked, or bloom-forked transactions.
In summary:
[validation] TransactionAddedToMempoollogs the initial addition of a transaction to the mempool for validation purposes.
[mempool] ...logs transactions that require operations on the mempool, such as queuing, forking, or bloom-forking.
By understanding these log messages and their implications, you can better monitor the Bitcoin network’s activity and optimize its performance when running Bitcoin Core.
