Sorry if it sounds stupid, but does it make sense to have an option to specify the transaction details and make them public/visible as some kind of advertisement:”Sold large pizza in LA”. Could it be good for buyers/sellers, for Bitcoin popularity as well?
This is already possible.
It is called an OP_RETURN output in the transaction. If any wallet creator wants to store a description, they can add such a feature to the wallet software.
Note that, storing this extra information would make the transaction larger and would therefore require more transaction fees for confirmation.
It is rarely used for such purposes, and there aren't any popular wallets that have implemented any method for displaying any of this data.
Clearly it is not a popular desired feature.
