Bitcoin reversed sharply higher on December 28, 2018, interrupting the renewed selling that had followed the cryptocurrency market’s pre-Christmas rebound.
StatMuse’s retained daily BTC price series records an opening price of $3,653.13, a low of $3,642.63, a high of $3,956.14 and a close of $3,923.92 for its December 28 interval. Those figures produce a 7.41% open-to-close increase and an 8.61% low-to-high range. The calculations are Coinburn’s, using the displayed values without additional rounding before the final percentage.
The move mattered because it was not confined to Bitcoin. A contemporaneous CoinCodex market report placed the broad acceleration at approximately 15:30 UTC and counted 92 of its 100 largest tracked cryptocurrencies as gainers over the preceding 24 hours. It said 48 had advanced by at least 10%. That was a snapshot of CoinCodex’s ranked universe, not a measure of every traded token or every exchange.
A rally without a verified catalyst
CoinCodex reported Bitcoin near $3,930 after the surge, broadly consistent with the $3,923.92 daily close retained by StatMuse. It also estimated that aggregate cryptocurrency market capitalization jumped about 9% to $132 billion during the move.
Market-cap totals require particular caution. They combine circulating-supply estimates with reference prices across assets that can differ radically in liquidity. The $132 billion figure therefore describes CoinCodex’s methodology and coverage at that moment; it is not equivalent to cash entering the market.
The contemporaneous report found no fundamental announcement that reasonably explained the sudden rally. That absence is significant. A price movement can be verified from market records even when its cause cannot. Thin holiday trading, position adjustments, liquidations or futures-related hedging are plausible mechanisms, but the surviving sources do not quantify their contributions.
Futures expiry supplied timing, not proof
December 28, 2018 was also the last trading day for CME’s December 2018 bitcoin futures contract, identified by the contract code BTCZ18 in the contemporaneous market report. CME designed its bitcoin futures around the CME CF Bitcoin Reference Rate, a once-daily benchmark aggregating executed Bitcoin-dollar trades from major spot exchanges during a defined calculation window.
The overlap made the expiry an obvious point of attention for traders. It did not prove that futures settlement caused the spot-market rally. Establishing that claim would require synchronized order-book, futures-position, liquidation and spot-flow data that the cited public record does not provide. The defensible conclusion is limited to chronology: a broad cryptocurrency rally occurred on the same date as the December CME contract’s final trading session.
What the rebound established
The December 28 advance showed that large percentage moves remained possible even after Bitcoin’s prolonged 2018 decline. It did not establish that the bear market had ended, that a durable floor had formed or that institutional demand had returned. A one-day reversal can reflect market structure as readily as a change in long-term expectations.
The price figures also are not universal Bitcoin prices. Crypto traded continuously across fragmented venues, and daily opens and closes depended on each data provider’s cutoff and exchange coverage. StatMuse does not expose those venue and timezone details on the cited result. CoinCodex’s roughly $3,930 observation was an intraday snapshot rather than an official close. Those limitations explain why this reconstruction treats the direction and approximate scale of the move as well supported while avoiding a causal claim.
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