BTC Technologies · DIV-001 · bw–1

THE
MANUAL

Four buttons. Nine instruments. One chain that does not care whether you are watching.

Read this

Once, then never

Time needed

Six minutes

Tools

Your thumbs

Firmware

bw1-2026.08

The face

Everything on screen at once. Nothing here refreshes behind your back — the panel holds its last state with the power off, which is why a watch you have not touched all day still shows you something true.

1Freshness tag How old the data is, always. LIVE under twenty minutes, then it counts the age out loud.
2The number Whatever the current instrument measures. Sets smaller as it grows longer, so the figure is never abbreviated.
3The box A second reading for the same instrument. UP turns it. This is where most of the watch hides.
4Epoch and halving Two dials, always on: progress through the difficulty period, and progress to the next halving.
5Sentiment Fear and greed, 0 to 100. The only number on the face that measures a mood rather than the chain.
6Twenty-four hours Price, with its high and low. The labels move out of the line's way.
7Mode strip All nine instruments. The filled one is where you are.

Four buttons

There is no touchscreen and no gesture to learn. Two of these do almost everything: MODE picks the instrument, UP turns its crown.

Button	Press	Hold
MODE / BACK	Next instrument	Return from time travel
UP	Turn the box dial. In WAL, cycle receive QR and Lightning	Fetch everything now
DOWN	Light, dark, or automatic theme	In WAL, hide the balance
MENU	Settings, wallet, time travel	In time travel, launch

If you remember one thing

Hold UP. It works in every mode and means "go and look now" — the corner reads FTCH while the radio is out, then the whole face refreshes. Use it when you have just turned on a hotspot, or when the tag has been counting up for an hour.

Nine instruments

MODE walks through them in order. Each one owns the big number, the box, and the line beneath — everything else on the face stays where it is.

What the corner is telling you

The top right never shows a mood or a signal-strength icon. It answers one question: how much should you trust what you are looking at.

LIVEFetched within the last twenty minutes.

OLD 34MThe age of the data, in minutes, then hours.

FTCHYou asked for a refresh and the radio is out.

SCANWalking the wallet's addresses.

DOCKOn the charger and streaming in real time.

CHGCharging, and asleep on purpose so it fills faster.

TRVLNothing on screen is now. See chapter 05.

DEMONo data yet. Set up WiFi.

Off the network

After twenty minutes without an update, block height stops being reported and starts being estimated — the unit line reads EST +36 BLK +/-6, meaning it has counted thirty-six blocks forward at the chain's measured pace and could be six either side. The watch would rather show you the size of its ignorance than a confident number that is quietly wrong.

Time travel

Everything the chain guarantees is a function of block height: the subsidy, the coins issued, the coins left, the epoch, the halving. None of it needs a network. So the watch will take you to any height and show you the face as it will read.

Forward · block 2,279,279 · August 2051

Back · block 210,000 · November 2012

MENU → Time TravelOpens on today.
MENU taps the unitTravel by block, day, month, year or halving.
UP and DOWN moveForward or back, one unit per press.
Hold MENU to launchThe whole watch goes there. The corner reads TRVL.
Hold BACK to come homeOr wait: it expires by itself after thirty minutes.

Out there	Where it comes from
Height, supply, epoch	Arithmetic. Exact.
Subsidy, halving dates	Arithmetic. Exact.
Price in the past	Fetched from the record.
Price in the future	A power-law model, labelled as one.
Fees	Not derivable. Shown as dashes.

Read the box

While travelling, the box states where the number came from: RECORDED if it was fetched, RECORDED, APPROX if interpolated offline, and POWER LAW MODEL for anything ahead of now. Nobody has been to block 1,260,000. The watch does not pretend otherwise.

First six minutes

Done once. There is no app to install and no account to make — the watch raises its own network, you fill in a form, and it never asks again.

Charge it first Plug in and leave it. Below 95% the watch declines the live dock and sleeps so the charger's whole output reaches the cell. The corner reads CHG.
MENU → Setup WiFi Join the network the watch advertises, then pick yours from the list. It holds three networks — add your phone's hotspot as one of them.
MENU → Setup Wallet Same portal. Paste a zpub, never a seed. Add a Lightning address if you want to be paid on the wrist.
MENU → Set Timezone Pick a city. The clock itself re-anchors to network time every six hours.
Calibrate the battery, once Fully charged, open About and hold UP until it buzzes. The watch learns what full reads on its own board.

On the hotspot

iPhone hotspots default to 5 GHz and the watch is 2.4 GHz only — turn on Maximize Compatibility or it will never see the network.

On the zpub

A zpub derives addresses and cannot sign. Losing the watch loses no coins. It does reveal your balance to anyone holding it, which is what hold DOWN in WAL is for — the numbers go behind dashes and the receive QR keeps working.

Water

Rain proof. Sand, dust and a whole afternoon outside are fine. It is not rated for swimming or submersion.