The Futures Industry Association has warned of a lack of transparency

Five Kiwis talk about the cryptocurrency phenomenon.

Kiwi dollar was heading for a weekly decline, after being dragged lower by the Oz dollar.

Mining operations have become big business amid the stratospheric rise in cryptocurrencies

The digital currency has surged by more than 1500 per cent this year.

US tax changes are not expected to benefit the tech sector.

The kiwi declined to US68.60c at 5pm from US68.76c at 8am.

The S&P/NZX50 Index gained 41.74 points, or 0.5 per cent, to 8,172.6.

The value of bitcoin has soared nearly 1200 per cent this year.

Some kittens are listed on its site for more than 50 ether, or about US$22,500

New Zealand shares fell, led lower by Xero and A2 Milk Co.

British man accidentally threw away $156 million worth of Bitcoin codes.

The kiwi traded at 68.43 US cents.

Dow climbed to a record 24,534.04 while the S&P 500 touched a record 2,665.19.

Market capitalisation now exceeds the annual output of whole economies.

Former English teacher has swapped the classroom for the stars.

The S&P/NZX 50 Index slipped 3.96 points, or 0.05 per cent, to 8,184.87.

Bitcoin recently broke the US$10,000 barrier.

Kiwis can buy a loaf of the bread for just 28 cents - but there's a catch.

COMMENT: The hype around Bitcoin hit crazy new heights last week. Where will it end?

Announcement comes in the week virtual currency shot through the US$11,000 mark.

The New Zealand dollar fell to a week-low.

Virtual currency plunged 20 per cent in minutes.

Opec agrees to keep supplies tight and bolster prices.

The kiwi traded at 51.29 British pence.

The value of bitcoin has surged past the US$10,000 mark

The cryptocurrency Bitcoin has soared to another high, and has more records in its sight.

The Auckland-based company reported a net loss of $3.6 million.

The kiwi traded at 69.04 US cents.

The kiwi rose as high as 69.05 cents.