How can I buy Bitcoin with all the millions in my account at once?

Bitcoin did a lot of growing up in 2017, but there was one trade this week that could go a long way toward stabilizing the market for the cryptocurrency and further establish its credibility in mainstream finance.

Sure, the meteoric rise in bitcoin prices has everyone debating whether it's one of history biggest bubbles, but just look at all the accomplishments that have put it on the cusp of joining the global financial system.

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LedgerX opened the first U.S. Commodity Futures Trading Commission-approved clearinghouse for cryptocurrencies in October, and began trading in swaps and options.

Cboe Global Markets and CME Group have started trading in bitcoin futures. The New York Stock Exchange, Intercontinental Exchange -- and no doubt others -- plan to offer exchange-traded funds based on bitcoin futures.

I spoke to some large bitcoin holders, most of whom have held for years and never sold, and all expressed at least some interest in doing similar trades.

It is a natural one, the "bitcoin billionaires" -- the approximately 1,000 people who hold an estimated 40 percent of all bitcoin, or an average of around $350 million each -- reducing their exposure in return for some cash today.

In turn, financial investors get a secure, levered exposure to bitcoin that is not hostage to an unproven price-setting and without the expense of setting up a system to hold physical bitcoin.

Bitcoin miners need cash for equipment and electricity bills (China this year cut off lending on bitcoin collateral) and early bitcoin adopters could stand to diversify their portfolios.

That's not necessarily a bad thing. After all, bitcoin was invented as an alternative to financial markets, and it functioned quite nicely for years with no connection to Wall Street. That's one possible path for cryptocurrencies, a parallel financial system.

But many people have set their hearts on linking the two systems, and we may have just seen the first trade to validate their dreams.

1. That is, the buyer paid the seller $990,000 today, and has the right but not the obligation to buy 275 bitcoin for $13.75 million any time before December 28, 2018. These 275 bitcoin are held by the LedgerX clearinghouse and will be released on Dec. 28, 2018 to either the buyer (if the buyer exercises the option by paying $13.75 million) or the seller (if the buyer does not exercise).
2. The implied volatility of this trade is 128 percent, which seems quite high for a one-year option, and perhaps speaks to investor enthusiasm for secure, levered bitcoin bets without the need to handle physical bitcoin, or perhaps to the reluctance of large bitcoin holders to sell even a little bit of their upside.
3. Another natural trade is for large bitcoin holders to buy out-of-the-money puts on some of their holdings in order to borrow money against them. Selling these puts also gives investors levered exposure to bitcoin, while providing bitcoin holders with cash.
4. This is a key difference between cash-settled futures (as Cboe and CME offer) and physical-settled derivatives (as LedgerX offers). Physical settlement enforces a link between the derivative price and the physical price. In the case of LedgerX, which requires 100 percent collateral, the physical bitcoin are actually taken off the market. This reduces price volatility and guarantees that at least one side of any LedgerX trade actually owns physical bitcoin