Authenticate
Tap the card so the app can verify its MoonCold identity and open a protected NFC session.
CARD-BASED HARDWARE WALLET
Your crypto.
Your confirmation.
MoonCold pairs a battery-free NFC wallet card with a companion app. Authenticate the card, derive its public wallet address, and verify its signing key locally.
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MOONCOLDVERIFY CARD SIGNINGConfirm with your cardCARD REQUIRED
MoonCold
HARDWARE WALLET
CARD + APP / ONE CLEAR FLOW
MOONCOLD CARDS
Three colors. One clear choice.
MoonCold NFC hardware wallet cards are offered in Red, Green, and Black. Choose a 2-card set for $49 or a 3-card set for $59.
Product appearance may vary.
View catalogTHE PROCESS
Three steps to a verified card key.
The current Android app performs the complete check locally through NFC.
Unlock and derive
Enter the card PIN, create a card-held BIP-32 key when needed, and derive the public Ethereum address.
Verify signing
The card signs a random local challenge and the app verifies the result against the displayed public key.
The card has no battery, port, or screen. The current app does not construct or broadcast cryptocurrency transactions.
DESIGNED AROUND THE PHYSICAL CARD
Keep the key operation in your hands.
MoonCold authenticates a supported physical card before PIN, derivation, or signing operations are allowed.
Authenticate first
The app accepts only cards signed by the MoonCold Card CA configured in the release.
Use the card you control
Keep the card against the phone during the protected session and never disclose its PIN.
Verify the public result
The app derives a public address and verifies a local signature without exporting the private key.
MOONCOLD / CARD CHECK
◐
Authenticate. Unlock. Verify.
Confirm that the displayed address and local signing result belong to the card in your hand.
View the safety guideCURRENT APP SCOPE
Clear, verifiable functions.
The current hardware flow derives the standard Ethereum path and verifies a secp256k1 signature locally. Separate offline tools check selected BTC, ETH, SOL and XRP public-address formats. Transaction construction, balances and broadcast are not included in this release.
View current specification statusGOOD TO KNOW
Questions before you begin.
Is MoonCold a hardware wallet?
MoonCold is a physical NFC card and Android companion. The current app authenticates a supported card, manages its card-held BIP-32 key and verifies local signing.
Does the card need charging?
No. The NFC field from a compatible phone powers the card during a tap.
Can I buy, sell, exchange, or send crypto in this release?
No. Buying, selling, exchange, transaction construction and broadcast are not included in the current app.
Which hardware-wallet network flow is available?
The current card workflow derives an Ethereum public address and verifies a local secp256k1 signature. The address checker separately validates selected public-address formats for BTC, ETH, SOL and XRP.
Where can I get setup help?
Read the support and safety guide and use only the official app and card instructions.