Are there any data sources where I can get the timestamps of individual trades/transactions? I'd like them to be at the second level or even the millisecond/nanosecond level. Ideally, the trades would also be linked to anonymized user names too. Is there a name for this type of data?
I have found very broad questions about data sources, but none about this specific type of data, or at least the proper term for it for a newcomer.