NSD-S3 is a hardware Nostr signer built on the LilyGo T-Display S3
(ESP32-S3, 1.9" display, native USB) — your private key lives on the board itself and
never touches a computer. This page is for a completely fresh / wiped
board. After connecting you'll need to tap RESTORE on the device itself before it accepts
anything — then enter your 12-word backup here with search-as-you-type; the device derives
the key and never sends it back over serial.
Works in Chrome or Edge on desktop only (WebSerial). If the device already
has a key, you'll be offered the chance to erase it here first — only do that if you meant to
overwrite it; use the on-device REVEAL flow instead to check backups of an existing key.
Your 12 words pass through this browser tab's memory while you type them (same
one-time trust as the on-device serial /restore-words command they call).
Only do this on a computer you trust, and only for words you're deliberately restoring
right now — never leave this page open afterward.
Not connected.
This device already has a key on it (). Restoring means
wiping that key first — only do this if you meant to overwrite it.
Wipes just the key — the device stays fully working, no reflash needed.
Alternatively, a full reflash at flash.flink.club
also erases the key (along with everything else) — only useful if the firmware itself needs
reinstalling.
Confirm on the device
The device is now showing ERASE?. Hold the button next to
HOLD ERASE > for 3 seconds to actually wipe the key — or tap
CANCEL > on the device to back out.
Waiting for the device…
Press RESTORE on the device
The device won't accept words until you confirm this in person. On its screen, tap the
button next to RESTORE > — you have 5 minutes once you do.
Waiting for the device…
Enter your 12 backup words
Tap a word box to select it, then spell it out on the on-screen keyboard below —
the letters shuffle to a new layout for each word, so a keylogger or shoulder-surfer can't
build a map of key positions across your whole backup. Matching suggestions appear as you go;
click one to confirm it and move to the next word. All 12 must be exact, valid BIP-39 words
before Restore unlocks.
Now set a PIN on the device
Words accepted. The device is showing SET PIN on its screen — choose a
6-digit PIN using its own buttons (BOTTOM cycles 0–9, TOP confirms each digit), then enter
the same PIN again to confirm. Your PIN never touches this page.