One of the biggest hacks of the year may have started to unfold. Late on Friday, embattled events business Live Nation, which owns Ticketmaster, confirmed it suffered a data breach after criminal hackers claimed to be selling half a billion customer records online. Banking firm Santander also confirmed it had suffered a data breach impacting millions of customers and staff after its data was advertised by the same group of hackers.While the specific circumstances of the breaches—including exactl...