Portable electronic device comprising magnetic means of stacking, in particular a hardware wallet for cold storage of private keys

A method for stacking at least two similar handheld electronic devices, each comprising a screen arranged on a chassis made of a non-magnetic material, in particular hardware wallets for cold storage of cryptographic keys from a blockchain, the method comprising:

• a step of fitting each device with at least four magnets designed to cooperate magnetically with four magnets of the similar device, whether the device is arranged above or below a considered device, and
• a step of arranging each magnet asymmetrically relative to a longitudinal center axis and/or relative to a transverse center axis of the chassis, to form a magnetic keying allowing a stack in which the same edges of the chassis of the devices are aligned and in which each magnet of one device faces the corresponding magnet of the other device.

16-17. (canceled)