North Korea is being widely blamed - why?

We don't yet know who was behind the attack, but as our cyber correspondent Joe Tidy says, all fingers are pointing towards North Korea. There are two main reasons for this: investigators including the FBI have blamed North Korea for similar hacks in the past, and crypto analytics firms say this hack looks like previous hacks widely attributed to North Korea. "Several features of this attack match earlier North Korea-linked heists," says Blockchain intelligence firm TRM Labs. It says i