TOKYO/SEOUL Long the preserve of geeky enthusiasts, bitcoin is going mainstream in Asia, attracting Mrs Watanabe - the metaphorical Japanese housewife investor - South Korean retirees and thousands of others trying to escape rock-bottom savings rates by investing in the cryptocurrency.

Asia's moms and pops, already regular investors in stock and futures markets, have been dazzled by bitcoin's 100 percent surge so far this year. In comparison, the broader Asian stocks benchmark has gained 17 percent over the same period.

Even after a tumble from last week's record $2,779.08 high, bitcoin rose more than 60 percent in May alone - driven higher in part by investors in Japan and South Korea stepping in as China cooled after a central bank crackdown earlier this year.

(For a graphic on bitcoin economy click tmsnrt.rs/2skLZ3c)

Over the last two weeks, and encouraged by Japan's recognition of bitcoin as legal tender in April, exchanges say interest has jumped from the two countries. Bitcoin trades at a premium in both, due to tough money-laundering rules that make it hard for people to move bitcoin in and out.

"After I first heard about the bitcoin scheme, I was so excited I couldn't sleep. It's like buying a dream," said Mutsuko Higo, a 55-year-old Japanese social insurance and labor consultant who bought around 200,000 yen ($1800) worth of bitcoin in March to supplement her retirement savings.

"Everyone says we can't rely on Japanese pensions anymore," she said. "This worries me, so I started bitcoins."

Asia has proved fertile ground for bitcoin due to the region's thriving retail investment culture, where swapping investment tips is already common. China, Japan and South Korea are home to several of the world's busiest cryptocurrency exchanges, according to a ranking by CoinMarketCap.

"Right now, it's a form of speculation, like stocks," said Park Hyo-jin, a 27-year-old South Korean who owns around 3 million won ($2,700) of bitcoin. "I don't think anybody in South Korea buys bitcoin to use it."

The risks, though, are rising too.

Bitcoin is largely unregulated across Asia, while rules governing bitcoin exchanges can be patchy.

In Hong Kong, bitcoin exchanges operate under money service operator licenses - like money changers - while in South Korea they are regulated similar to online shopping malls, trading physical goods. Often there are no rules on investor protection.

BITCOIN WHEN YOU DIE

Park and Higo were drawn into bitcoin by friends. Others are attracted through seminars, social media groups and blogs penned by amateur investors.

Noboru Hanaki, a 27-year-old Japanese web marketer and bitcoin investor, said his personal finance blog gets around 30,000 page views each month. The most popular post is an explanation of bitcoin, he said, noting that when the bitcoin price surged last month, readership of the article doubled.

Rachel Poole, a Hong Kong-based kindergarten teacher, said she read about bitcoin in the press, and bought five bitcoins in March for around HK$40,000 ($5,100) after studying blogs on the topic. She kept four as an investment and has made HK$12,000 tax-free trading the fifth after classes.

"I wish I'd done it earlier," she said.

Not everyone's making money.

The bitcoin frenzy has spawned scams, with police in South Korea last month uncovering a $55 million cryptocurrency pyramid scheme that sucked in thousands of homemakers, workers and self-employed businessmen seduced by slick marketing and promises of wealth.

Seminars in Tokyo, Seoul and Hong Kong promote similar multi-level marketing schemes that require investors to pay an upfront membership fee of as much as $9,000. Members are encouraged to promote the cryptocurrency and bring in new members in return for some bitcoins and other benefits.

One such Tokyo scheme offered members-only shopping websites that accept bitcoin, 24-hour assistance for car and computer problems, and bitcoin-based gifts when a member gets married, has a baby - or even dies, according to marketing materials seen by Reuters.

Leonhard Weese, president of the Bitcoin Association of Hong Kong and a bitcoin investor, warned amateur investors against speculating in the digital currency.

"Trading carries huge risk: there is no investor protection and plenty of market manipulation and insider trading. Some of the exchanges cannot be trusted in my opinion."

Some larger exchanges have voluntarily adopted security measures and compensation guarantees, according to their websites, although there are dozens of smaller platforms operating more or less unchecked.

In South Korea, the Financial Services Commission (FSC) has set up a task force to explore regulating cryptocurrencies, but it has not set a timeline for publishing its conclusions, an official there said.

In Japan - where memories are still fresh of the spectacular 2014 collapse of Mt. Gox, the world's biggest bitcoin exchange at the time - the Financial Services Agency (FSA) said it supervises bitcoin exchanges, but not traders or investors.

"The government is not guaranteeing the value of cryptocurrencies. We are asking for bitcoin exchanges to fully explain the risk of sharp price moves," an FSA official said.

Some professional investors say bitcoin can be a useful hedge to help diversify a portfolio, but investors should be cautious.

"This is an extremely volatile and innovative asset class," said Pietro Ventani, managing director of APP Advisers, an asset allocation strategy firm.

(Reporting by Minami Funakoshi in Tokyo and Joyce Lee in Seoul, with additional reporting by Michelle Price in Hong Kong and Yoshiyuki Osada, Takahiko Wada and Hideyuki Sano in Tokyo; Writing by Michelle Price; Editing by Clara Ferreira-Marques and Ian Geoghegan)

TOKYO Japan's Mizuho Financial Group will start a venture next month to create new businesses using "fintech," an executive said, joining a global race in financial technology that threatens to unsettle traditional players.

NEW YORK Kik Interactive, which created the chat platform Kik, said on Thursday it was launching a crypto-currency or token called Kin that would enable customers to use a whole range of digital services.

NEW YORK Financial and technology companies led by Bank of America Corp, SBI Holdings Inc, HSBC Holdings Plc, Intel Corp and Temasek Holdings have invested $107 million in R3 CEV, a startup which runs a big bank consortium seeking to develop blockchain technology, it said on Tuesday.

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Fretting over savings, Mrs Watanabe turns to bitcoin - Reuters