BTC Metronome — Real-Time Bitcoin Block Clock

◆ Halving

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blocks remaining

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◆ Difficulty

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expected change

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BTC Metronome

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◉ The Clocks

Three analog clocks display the current block count since local midnight for EST (UTC-5), UTC, and GST (UTC+4). Each clock face is divided into 144 positions representing the expected daily block count. The main needle points to the current block, color-coded by progress zone — green from block 0 to 96 signals the block resolved on time, violet from 96 to 140 signals the block is running late, and red from 140 onwards signals the block is significantly overdue — the needle continues cycling if no block arrives. A white sweep needle tracks the time elapsed since the last confirmed block, resetting to zero the moment a new block arrives — reflecting Bitcoin's variable block intervals, which can range from seconds to over an hour.

Yellow day arc — an outer arc sweeps clockwise from midnight, completing one full circle over 24 hours. Compare it against the block needle to instantly read how many Bitcoin blocks arrived in how many hours of the day.

■ The 144-Block Grid

Below the clocks a grid of 144 squares represents the last 144 confirmed Bitcoin blocks. Each square has a double orange frame with a color-coded center — green for blocks confirmed within 600 seconds and red for late blocks. Blocks are ordered with the most recent at top-left. Hovering over any square reveals the block number, height, exact timestamp, confirmation time, and a 12-block rolling average interval for network context.

The 144 blocks are divided into four groups of roughly 36 blocks, each representing a 6-hour window of the day. A brace label between groups shows the actual elapsed time for that window, making it easy to spot stretches where blocks arrived faster or slower than the 10-minute average.

◯ Block Appointments & Alarms

Bitcoin blocks do not arrive at perfectly regular intervals. Some blocks are solved in under a minute while others can take 15, 20 minutes or more — the network targets an average of 10 minutes per block but individual intervals vary widely. This makes block-based scheduling inherently approximate.

To set a block appointment, registered users select a date and target block (0–143) on a weekly calendar. Because block timing is unpredictable, the system calculates an estimated wall-clock time based on a 7-day rolling average of recent block intervals, projected relative to your configured local timezone — EST, UTC, or GST. This estimate is displayed with an uncertainty window so you know the expected time range, not just a single point.

Four email notifications are sent automatically: a confirmation with the time estimate when the alarm is created, an early warning at 7 blocks before, an imminent alert at 2 blocks before, and a final notification the moment the target block is reached — showing the actual arrival time versus the original estimate.

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Block: 72

All blocks for today have passed. Select a future date or use a block height alarm.

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Timezone

Block Height Alarm

Clear Reached