> that EU regulation requires their timestamps to be within 100 microseconds of UTC,
It's the same in the US. It's covered under CAT NMS (Consolidated Audit Trail, National Market System). Probably too much information at: https://www.catnmsplan.com/
It's the same in the US. It's covered under CAT NMS (Consolidated Audit Trail, National Market System). Probably too much information at: https://www.catnmsplan.com/