Easy to recognize
A distinct shape, screen, and ports can reveal a device's purpose at a glance, even when its internal safeguards are strong.
NFC HARDWARE WALLET · QUIET BY DESIGN
Security,
without the spotlight.
Keep security inside the card and ease in everyday life. RiverKey explores independent signing hardware in the shape of an ordinary membership card: no conspicuous crypto branding, and no extra device to carry.
A discreet card format · Designed for everyday life
FIELD NOTES CLUB
Everyday
Member
Member
MEMBER 0427 · ACCESSR / K
LOOKS ORDINARY. THINKS DIFFERENTLY.
85.6 × 54 mmStandard card size · Design target
NFCTap interaction · Design direction
0 batteriesPassive power · Design target
01 / THE CENTRAL IDEA
Security doesn't need to announce itself.
Many hardware wallets protect what matters, but make the person carrying them easier to notice. We are exploring a different approach: keep protection within, and let the exterior feel ordinary.
An ordinary card for your wallet
Its size and visual language resemble an everyday membership card. No special case, and no need to explain what you carry.
Keep signing inside the card
The design proposes a separate secure element as the signing boundary, with sensitive operations kept within the card rather than exposing private keys to an external interface.
Nothing to give it away
No coin motifs, flashing lights, or obvious gadget silhouette. At first glance, it is simply part of everyday life.
02 / A SIMPLE ROUTINE
From setup
to everyday ease.
Keep each interaction simple and let the card's design handle the complex work. The proposed flow will evolve through product development and independent security review.
Set up the card
The proposed experience begins with card and companion-app setup. The security process still requires independent evaluation.
Tap your phone
Use your phone's NFC connection to access public account information while keeping sensitive material out of the external interface.
Confirm the action
Signing is intended to stay inside the card. This website does not initiate or process transactions.
Carry on
Put the card away and continue your day. It need not look or feel like another piece of technology to carry.
03 / DESIGN PRINCIPLES
Less to show.
More to consider.
Every detail serves two goals: make the card feel at home in daily life, and make its security boundaries clearer. Final specifications depend on validation.
Tap with NFC
A familiar contactless interaction is the design direction, reducing the need for extra cables or readers.
A familiar size
A standard card format is the target, designed to fit the wallets and cardholders people already use.
Understated materials
Everyday membership cards inspire the feel and visual language, rather than an overtly technical aesthetic.
Made for daily life
Durability and long-term use remain priorities for prototype evaluation; final materials and test results are not yet confirmed.
Nothing extra to carry
The card is intended to fit naturally among the essentials you already bring with you.
Only what matters
Fewer exposed controls and unnecessary interfaces keep the experience focused on what matters most.
CURRENT PHASE / PRODUCT DEVELOPMENT
The next everyday card
is taking shape.
The product is currently in the prototype stage. Its appearance, interactions, technical specifications, and availability may change. Final details will be confirmed at launch. Purchases and wallet functions are not currently available.
IN
PROGRESS2026 / PRODUCT DESIGN
PROGRESS2026 / PRODUCT DESIGN
04 / PEOPLE WE'D LIKE TO MEET
Better products begin with honest conversations.
An early idea needs more than applause. It benefits from questions, observation, and collaboration across different perspectives.
Security researchers
Help examine the threat model, interaction boundaries, and risks that might otherwise be overlooked.
Content creators
Help discuss new hardware formats and real-world use cases with clarity and care.
Experienced users
Bring practical self-custody experience and questions about carrying a device every day.
05 / GET IN TOUCH
Let's start
a conversation.
If understated hardware design interests you, email us about product direction, security research, or real-world experience.
HARDWARE CARD · OPEN TO IDEASProjectHardware Card
Current stagePrototype development
Contacthuangshang360@gmail.com
CollaborationSecurity research / User feedback / Content partnerships
A great first email
Introduce yourself, share the design question that interests you, and tell us how you would like to collaborate. Use the button below to copy our email address.