Air-gapped signing
Confirm every send on the 3.5″ screen — keys stay offline.
Hardware walletBitcoin & Kaspa only
SeedMask Pro
Mask your seed. Sign offline.
Air-gapped hardware for Bitcoin and Kaspa. Keys stay on device. Confirm every send on the 3.5″ screen.
Device profile
- Signing
- Air-gapped
- Display
- 3.5″ touch
- Chains
- Bitcoin · Kaspa
- Also on device
- Passwords · 2FA · Notes
SeedMask Pro · offline signer
Watch-only app
Coordinator never holds your seed. Desktop stays clean.
Bitcoin & Kaspa
Focused support — Satoshi’s vision, and beyond.
Mask more than crypto
Passwords, 2FA, and notes — masked on device with your backup.
How it works
Three steps. One air gap.
SeedMask separates watching from authorizing — so your everyday computer never holds the keys that move funds.
- 01
Build an unsigned transaction
Create Bitcoin or Kaspa transactions in Coordinator. Review amounts and destinations in a clear watch-only workspace.
- 02
Sign on SeedMask
Move the unsigned transaction to the device. Read every detail on the 3.5″ touchscreen before you approve.
- 03
Broadcast the signed transaction
Return the signed transaction to Coordinator and broadcast — only after you have authorized offline.
SeedMask Coordinator
Watch-only desktop control
Balances, addresses, and unsigned transactions on your machine. Move them to SeedMask to sign, then bring the signed transaction back — without exposing keys to the network.
Hardware
Air-gapped by design
SeedMask is a dedicated signing device for Bitcoin and Kaspa — and a place to mask passwords, 2FA, and notes behind your seed. No multi-chain sprawl. No soft wallet pretending to be cold storage.
- 3.5″ confirmation screen
- Password manager, notes & 2FA on device
- Passphrase, BIP85 & temporary wallets
Hardware is almost here
Follow @Seedmask for updates — Coming soon is the door for the device.