Ah, you're talking about transaction IDs (txid), right? They are identifiers for individual Bitcoin transactions, indeed.

They're pretty useful! You can use them to check the status of a transaction on the blockchain. For instance, if you sent some Bitcoin and want to make sure it arrived safely, just look up the txid on a blockchain explorer.

They also provide transparency and accountability. Since all transactions are public on the blockchain, anyone can verify them using these IDs.

So in short mate - they might not be flashy but they do have their uses!