Bitcoin Block Clock (Live)
The halving is not a date. It fires every 210,000 blocks. This clock measures Bitcoin's cycle in blocks, the protocol's own unit, and counts down to the band where past cycle lows have landed.
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Every halving epoch on one ruler. Each row starts at its halving, and the dots mark where that cycle topped and bottomed. Switch the ruler between blocks and days to see which one keeps better time.
Heights are the block that was current on each turn's date, the same data behind Section 5.9 of the research paper. The bands are regularities measured on three cycles, not a schedule and not financial advice. The clock times the turns, it does not predict price. Day estimates use the last 30 days of block production and shift as the chain speeds up or slows down.
The full breakdown is in The Block Clock guide and the research paper on arXiv. For the price side of the bottom, see the bottom zone, and for the next halving, the halving countdown.
Bitcoin's halving is usually called a four-year event, but the code never mentions years. The halving fires every 210,000 blocks, exactly, a rule written into the software at block zero that nobody can change. Four years is only our estimate of how long 210,000 blocks takes. This page measures the cycle the way the protocol does, in blocks since the last halving.
That difference matters because the chain does not run on time. Bitcoin aims for one block every ten minutes, or 144 a day, and difficulty adjustments keep pulling it back toward that pace, but it drifts in between. From 2011 to 2013 it ran about 15 percent fast. A calendar hides those drifts inside the cycle, so turns that happened at almost the same block count can look weeks apart when you count days.
Counted in blocks, the pattern tightens. The last three cycle tops landed between 77,901 and 79,596 blocks after their halvings, about 12 days of mining apart, while the calendar spreads the same three tops across 21 days. The last three cycle lows landed between 128,910 and 133,934 blocks in, a band about 35 days of mining wide, where the calendar spreads the same three lows across 135 days. Tested against look-alike clocks such as the US election cycle and a fixed calendar, the halving's block count held the tops far more tightly than either.
In this epoch that bottom band runs from block height 968,910 to 973,934. The research paper registered it in public before the chain got there, and the dial at the top of this page counts down to it live. It is a pattern measured on three cycles, not a law, and it says when past turns happened, not what price will do next. The first cycle top in 2013 landed well before the band and stays on the chart in grey, because a clock that hides its misses is not worth trusting. For the price side of the same question, pair it with the bottom zone chart.
The charts are public. The read is the edge.
These indicators are free for everyone. Inside the community you get the daily desk note that ties them together, alerts when price enters a cycle window, and the Satoshi Clock running on your own charts.
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