North Korea's hydrogen bomb test

North Korea carried out its most powerful nuclear test to date on Sunday - 120 kilotons: 10 times stronger than last nuclear test and 8 times the power of Hiroshima bomb (according to NORSAR, a Norway-based group that monitors nuclear tests - although South Korean officials gave a more modest estimation, saying that Sunday's bomb had a yield of 50 kilotons) - claiming to have developed an advanced hydrogen bomb that could sit atop an intercontinental ballistic missile.

North Korea claimed it set off a thermonuclear (hydrogen) nuclear weapon during that test (use a fission explosion to create a fusion reaction, which is far more powerful than a fission reaction), but most experts said the data showed it was more likely merely a boosted fission weapon - meaning an atomic bomb which uses some hydrogen isotopes to create bigger yield; although on the other hand, the elongated shape of the device shows a marked difference from pictures of the ball-shaped device North Korea released in March last year and appears to indicate the appearance of a two-stage thermonuclear weapon.

In my opinion, more likely than a nuclear attack is the possibility of an​ electromagnetic pulse, or EMP, attack:

That applies to crypto currencies​ too.
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The bulbous peanut shaped object is the warhead itself. The larger side, closer to the silver cylinder with the wires protruding is the fission device, which explodes and then detonates the smaller end of the object - which is the fusion part of the explosion. The cylinder at the back is the firing set: the electronics that will start off the explosion. North Korea has yet to prove that their warheads placed on a long range-missile can survive re-entry into the earth's atmosphere after an intercontinental flight.

President Donald Trump said: "North Korea is a rogue nation which has become a great threat and embarrassment to China, which is trying to help but with little success."

In response to the massive nuclear test US General Joseph Dunford called his South Korean counterpart, General Jeong Kyeong-doo to promise support and cooperation.

Interestingly, South Korea demanded a strong response to North Korea's threat and the test triggered a similar response from India - but the UK, who is deep in China's pockets (50bn pounds worth of investment in the UK and a new deal to sign British meat to China) and who therefore acted as China's Trojan horse is in the EU - lobbying for Chinese steel industry at the cost of UK's own steel industry:
http://www.telegraph.co.uk/business/2016/03/30/britain-sacrifices-steel-industry-to-curry-favour-with-china/

• and which the US President has not visited (despite his visits to Warsaw and then Hamburg), expressed (via its foreign secretary Alexander Boris de Pfeffel Johnson ) its scepticism regarding the military option: “It’s certainly our view that none of the military options are good,” he told reporters.

And for those interested in what is the difference between atomic bomb and thermonuclear bomb