A Blacksky Project
The Eternal Ledger
A clock that measures time in blocks.
Enter the Clock →
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What it is
The Eternal Ledger is a living, ambient visualization of the Bitcoin
blockchain. A clock that measures time not in seconds but in blocks.
Bitcoin produces a new block roughly every ten minutes. That cadence
— irregular, unstoppable, indifferent to human time — is the heartbeat
this instrument makes visible. The central arc counts down to the next
block. It drains from gold to red. When the block arrives, it resets.
It never stops.
Block 0 · January 3, 2009 · UTC 18:15:05
Bitcoin time is not human time
A Bitcoin year is 52,500 blocks. The chain has been running
since block zero, when Satoshi embedded a Times headline in
the genesis block:
"Chancellor on brink of second bailout for banks."
That message is still in the chain. It will always be in the chain.
The Eternal Ledger makes that permanence tangible — drag the timeline
back to 2010 when Bitcoin was worth less than a cent, to 2017 when it
first crossed ten thousand dollars, to the moment of the third halving
when the block reward fell to 6.25 BTC.
The arc keeps running in the present, unaffected by where you are
looking. That separation — the clock doesn't care where you're
browsing — is the philosophical core of the piece.
What the dial shows
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The Arc
A 10-minute countdown that drains gold to red and resets on every real block confirmation. When a block runs late, the ring breathes ember.
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Block Height
The current chain tip. Every entry permanent, every entry timestamped, since January 3, 2009.
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BTC Price
A live trade stream from Coinbase, ticking in real time. Scrub the timeline and the price re-anchors to that moment in history.
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Macro Context
Gold spot and the NASDAQ Composite — the two reference frames Bitcoin is always being compared to, ambient in the periphery.
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Era & Halving
Which 210,000-block era you're in, how many blocks remain until the next halving, and how old the chain is in years and days.
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The Timeline
A scrubber from Genesis to today. Every halving, every major moment marked. The arc keeps drawing forward while you wander backward.
Roadmap
Phase I
The Exhibit Complete
A single-file web instrument: the arc, the orbiters, the timeline scrubber, the LIVE / HISTORY toggle.
Phase II
Real Time Live
WebSocket block confirmations from blockchain.info. Live BTC ticks from Coinbase. Macro context from gold and NASDAQ. The full historical price chain back to Genesis.
Phase III
Synapse Next
Ten years of news as a dataset, surfaced for any block on the timeline. The clock becomes a research instrument: price is what happened, news is why.
Phase IV
Embedded Hardware
An ESP32-S3 with a circular display, WiFi-connected, no browser required. The arc, drawing itself, every second. A self-contained ambient object.
Phase V
Gallery Edition Limited
A powder-coated aluminum disc with an addressable LED ring routed into the face. Numbered, signed, collectible — the Bitcoin hardware clock as a designed object, in the tradition of Nixie tube clocks.
The longest unbroken chain in human history
Every ten minutes, a new entry. Every entry, permanent. The Bitcoin
ledger is the longest unbroken chain of timestamped records human
civilization has ever produced, and it will keep running after every
institution currently on Earth is gone.
The clock just makes it visible.
Enter the Clock →