SeedHammer II emulator

Custom title

Engraved onto every plate. Lower-case is converted to upper-case. Codex32 plates fall back to the share ID when this is blank.

Navigation

The SeedHammer II is touch-only. Click on the screen to interact with the firmware UI. Press-and-hold (e.g. to start an engrave) by keeping the mouse button down — the on-screen button shows a progress ring while held.

NFC tap

1BIP-39 12-word
2BIP-39 24-word
3P2WSH 2-of-3 multisig
4P2SH 2-of-3 multisig
5singlesig (bare xpub)
6BlueWallet JSON multisig
7NIP-19 nsec (Nostr secret)
8NIP-19 npub (Nostr public)
9codex32 share A (2-of-3)
0codex32 unshared
eCUSTOM block text (full plate sample → text-grid-16-lines.svg)
qunknown format (rejection)
wcompound Nostr (rejection)
Synth tap (debug) — paste hex or load .bin

Send arbitrary bytes through the same nfcReader.tap path the keyboard shortcuts use. Use to test payloads captured from webnfc Download .bin or any other source.

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