Standard
Daylight- E-paper readable in any room with daylight
- Lowest power draw — sips off a phone charger
- The minimalist's choice
BLOCK 951000 ·
A clock for the Bitcoin network
Bitcoin,
told in e-paper.
Block height. Spot price. Median fee. Halving countdown. Updated in real time, read at a glance, no phone required. Sits on a shelf and just ticks.
- Latest block
- 951000
- Spot price
- $77,600
- Median fee
- 1.00sat/vB
Booting WASM data-handler…
Connecting… Block 951000
Block 951000 /
Price $77,600 /
Fee 1.00 sat/vB /
Sats per dollar 1,289 /
Supply 20,034,375 BTC /
Halving 99,000 blocks to go /
Block 951000 /
Price $77,600 /
Fee 1.00 sat/vB /
Sats per dollar 1,289 /
Supply 20,034,375 BTC /
Halving 99,000 blocks to go /
§ 01
Manifesto
The first oracle is the timechain itself. Every ten minutes the network publishes a fact that no central bank can revise, no analyst can reframe, no PR desk can spin. A clock for that fact should not require an account. Should not ship telemetry. Should not need a phone. Should sit on a shelf and just tick.
BTClock is the object on the shelf. It listens to the same public feeds the rest of the Bitcoin network does, paints the numbers that matter to e-paper, and refreshes the picture in the time it takes to pour a coffee. It does that, and nothing else, for as long as the network keeps proving work.
§ 02
Catalogue
Twelve ways to read the network.
Every screen below ships with the firmware. Pick one as the default — or let them rotate.
Booting WASM data-handler…
01
Block height
The only oracle that ever shipped.
Booting WASM data-handler…
02
Spot price
USD, EUR, GBP, JPY and 160+ more — pick your denomination from the on-device WebUI.
Booting WASM data-handler…
03
Moscow time
Sats per dollar. Pick one of 16 sats-symbol variants, or hide the marker entirely.
Booting WASM data-handler…
04
Halving countdown
Counts in blocks, optionally in time.
Booting WASM data-handler…
05
Median fee rate
Two-decimal sat / vB — what you'll pay to confirm soon.
Booting WASM data-handler…
06
Circulating supply
Computed from height — no trusted feed required.
Booting WASM data-handler…
07
Market cap
Supply × spot, calculated locally.
Booting WASM data-handler…
08
Wall clock
If you must. Hours, minutes, day, month.
Booting WASM data-handler…
09
Inverted
White-on-black for the night shift.
10
Nostr zap
Get notified of every zap on Nostr.
11
Bitaxe hashrate
Live readout from your home miner. Best-difficulty share, too.
12
NWC integration
Get notified of sent and received payments on your Lightning wallet.
§ 03
Typography
Twelve typefaces.
One block height.
Switch the face the panels paint in from the on-device web UI. Every family below is rendered, right now, in the live block height.
- 01 AntonioBooting WASM data-handler…Condensed sans · default
- 02 OswaldBooting WASM data-handler…Condensed sans · alt
- 03 InterBooting WASM data-handler…Geometric grotesk
- 04 Source SerifBooting WASM data-handler…Modern serif
- 05 MerriweatherBooting WASM data-handler…Slab serif
- 06 BitterBooting WASM data-handler…Slab serif · alt
- 07 AtkinsonBooting WASM data-handler…Humanist · hyperlegible
- 08 Open RundeBooting WASM data-handler…Geometric · rounded
- 09 RobotoBooting WASM data-handler…Neo-grotesque
- 10 Noto SansBooting WASM data-handler…Universal sans
- 11 UbuntuBooting WASM data-handler…Humanist sans
- 12 AzeretBooting WASM data-handler…Contemporary display
All twelve shown above — most also ship a Bold variant; Antonio adds a SemiBold. Switch them from the on-device web UI.
§ 04
Hardware
One clock,
two editions.
The standard panel reads beautifully in any daylight. The frontlight edition adds an ambient-controlled LED frontlight in front of the e-paper so it stays legible after dark.
With frontlight
Day & night- Ambient-controlled LED frontlight — readable in the dark
- Ambient sensor dims it automatically
- Living-room duty after sunset
§ 05
Sovereign by default
No accounts.
No telemetry.
Your data sources.
Open source
Firmware, schematic, and web UI are all public. Read every line — or contribute one.
Source on Forgejo →Pick your data source
Use the public BTClock feed, point it at mempool.space and Kraken, or self-host the server — its code is open source too.
See data sources →Set up in a browser
Plug it in, open the captive portal, pick your Wi-Fi. Updates arrive over the air from the on-device web UI.
Open the flasher →Always on
Sips current — e-paper only draws during refresh. Lives happily on a phone charger, indefinitely.
Take it home
Sit it on a shelf.
Let it tick.
btclock.store
Order one
Fully assembled, or as a kit if you want to solder it yourself. Both ship from the EU.
→
web-flasher-v4.btclock.dev
Update from your browser
Plug your BTClock into a USB cable, open the flasher in Chrome, and the latest firmware installs in seconds. No drivers, no IDE.
→
docs.btclock.dev
Read the docs
Setup walk-through, screen reference, troubleshooting, and the API surface. Searchable.
→