Bitcoin investors are bracing for “Witching Friday” tomorrow, December 18, when billions of options are due to expire—making for what could be a highly volatile roller-coaster ride at the end of the week for the markets.

Some $23 billion in contracts are set to expire on Deribit, the largest Bitcoin exchange, according to Bloomberg.

Here’s what to know.

“Witching Friday,” also known as “triple witching” or “the triple witching hour,” refers to the last hour of the stock market trading session on the third Friday of March, June, September, and December. This is when three kinds of securities expire simultaneously, often leading to increased........

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