Move a file between two devices in the same room.

Two lanes of sixteen tones, 17.0 to 18.6 kHz, 25 bytes a second. Nothing to pair; the other seat only has to be in earshot.

1. Pick a band. Quiet is the default.
2. Start listening, and allow the microphone.
3. Watch the waterfall for stepping tones.
4. Ping, to check the other device.

Everyone in earshot hears this. To talk, go to Comms.

The screen only shows ciphertext. A photograph of it gives nothing.

1. Pick a passphrase both devices know.
2. Add a message, or attach a file.
3. Seal and send, or seal and save.
4. They type the same passphrase.

Nothing sealed.

The passphrase above, made visible: the keystream, and the picture with that keystream subtracted from it. A demonstration only, and it goes one way. To send a picture somebody can open, use Scatter.

Nothing split.

Sealed arrivals land here.

A picture out as noise, and a way back. The phrase is minted here, eighty bits. Send it separately from the picture.

1. Choose a picture; it leaves as noise.
2. Save the picture, copy the phrase.
3. Send the two by different routes.
4. They gather it with the phrase.

Send the file, never a photo of it. A re-encode or a resize destroys it, and the app says so rather than hand back noise. What comes back is a dither, which is all three bits a pixel can hold.

Each batch asks: re-encode, or send the original. To send text, use Comms.

1. Add photos from this device.
2. Choose re-encoded, or the original.
3. Point their camera at this screen.
4. Broadcast, for more than one camera.

Watching

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Confirmed

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1. Pick the chain and paste an address.
2. Add an amount, if you want one.
3. They scan the code, or copy the URI.

1. Paste the unsigned PSBT or transaction.
2. Check the inputs, outputs and fee.
3. Send to the signer, or show UR.
4. The signed one comes back the same way.

Kind

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Inputs

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Outputs

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Sending

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Fee

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