1.
Convenient &
Secure
Hardware
Wallet

2.
Key Features
For long term saving
• Support for watch
only addresses
For medium term
saving for future
expense
• Separate Wallets for
different classes of
expenditure
For daily transactions
• Lightning Network
channels.
For prepaid card with
oversight
• Separate device with
preloaded coins for
each member
Onboard last person
of society
• Low cost
• Inconspicious USB
device
• Tied with a mobile
phone.
Never carry all your
money
• Hardware device
only carries private
keys and addresses
secured by HSM.
• Keys are
generated offline on
unconnected
computer

3.
Guiding Principles - Requirement Mapping
Security
• Security against theft: Theft or loss of device/mobile phones, Limited loss against robbery, secure against loss on physical break into device.
• Security against hacking and attacks: Fake device, trozen apps, Man in the middle attack, spyware/key-loggers.
• Safe recovery of coins when device and mobile are lost, stolen or broken.
• Safe recovery of coins if password is lost
Privacy
• Each address pays one time
• Bloom Filter based network communication
• Bluetooth device wallets are "Just a bunch of keys (JBOK)"
Convenience
• Easy to pay (All payments will happen through Mobile app)
• Easy to receive (Receiving will happen through Mobile app)
• Ease of recovery (Seed will help in recovery)
• Easy to carry (Very small USB device)
• Easy to secure (Seed can be written on paper or remembered easily)
Open Source
• Open standards
• GPLv3 Mobile App

4.
Target Use cases
Initialization
It should be easy tosetup
Devicessecurely.
Initialization happensoffline
Recovery
Loss of devicesor mobile
should not lead to loss of
funds.
Recovery should be easy.
Recovery happensoffline.
Payment
Sendingorreceivingshould
support QRcode, addresses
and app integration.
Payment/Receivingshould be
secure.
Fund
allocation/partition
Allows allocation of funds
among children oremployees
with oversight but not control.
Allows multiple walletsbased
on usage and security.
Cold Storage
Wallet should allow watch
only addresses for only
receivingfunds.

5.
Components

6.
Security Features
Security
Device
verification
Bootable Linux
Image
Blutooth device
Authentication
3-factor
authentication
User (Password)
Mobile App
Blutooth Device
Blutooth stores
multiple wallets
Device
communication
Encrypted
communication
Private/Public
keys not
exchanged
Recovery
Mnemonic code
based
Only through
linux usb pen
drive

7.
Privacy Considerations
Single time
address use
• Change left in a
transaction is
transferred to
new address.
Bloom Filter Based
communication
• We will have
Simple Payent
Verification (SPV)
implementation
on our mobile
app.
Wallet is "Just a
bunch of Keys"
• We will not use
xpub as this can
link between
addresses.