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Stacks of bitcoins stand in front of a U.S. one dollar bill in this arranged photograph in London, U.K., on Friday, Jan. 29, 2016. Bloomberg News

It was a banner day for the Bitcoin Investment Trust (GBTC) as the cryptocurrency experienced a cryptic price surge.

Trading units of the Bitcoin Investment Trust surged 24% on record volume, the biggest one-day price move in more than seven months. Price moves in the trust units were commensurate with bitcoin itself. The Wall Street Journal reports that trading spiked over the weekend. As with all things bitcoin, the reason was opaque. The spike was reportedly in anticipation of a built-in bitcoin structural mechanism, due to take effect within the next month, that could limit the reward for creating bitcoins and potentially diminish supply.