KindleWallet
An old Kindle becomes an offline wallet for twelve coins.
A jailbroken Kindle that never goes online holds one 24-word phrase, made on the device and sealed by a PIN. It gives Bitcoin, Ethereum, XRP, shielded Zcash, BNB Chain, Solana, Monero, Tron, Base, Arbitrum, Robinhood Chain and post-quantum Quantus, each with its own screen and QR codes on e-ink, and each coin's whitepaper to read. Signing with ZApp is next. Experimental, not audited.
Twelve coins, one phrase
The same 24 words restore every coin in its usual wallets: each derivation is checked against published test vectors.
Offline, sealed by a PIN
The phrase is made on the Kindle and kept encrypted (Argon2id, AES-256-GCM). The power button locks it.
A screen for each coin
QR and a fresh address every time, plus what the coin needs: Zcash viewing key, Bitcoin zpub, Monero view key.
Shielded Zcash
Orchard addresses only, from the same signer core as ZFirm.
Post-quantum Quantus
ML-DSA-87 accounts, derived exactly as Quantus's own wallet does.
Whitepapers on e-ink
Bitcoin, Ethereum, Zerocash, CryptoNote, Solana and more, laid out again for the Kindle's screen.
Logos, three to a row
Every coin's official mark on the home screen; tap one to open it.
Next: signing with ZApp
The phone builds the payment, the Kindle shows it and signs. Keys never leave it.
On the Kindle
Unlock with your PIN
Bitcoin, a new address each time
Zcash, shielded only
The Zcash viewing key
Monero, with its view key and words
XRP Ledger
Tron
Robinhood Chain, the EVM address
Quantus, post-quantum
The Bitcoin whitepaper
Reflowed for e-ink