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Wearables work, if you like adorning yourself with tings. 

Biometrics seem so much more natural, and there's no technology to make invisible, for the consumer that is...

Why not set the default card based upon the current location? For example, if you're at Hammersmith tube station, set default card to Oyster card. If you're at Harrod's, set default card to black Amex.

In Canada you have a super low cost national debit card network: Interac, which receives 1c for each transaction (from acquirer and issuer); and there is no interchange payable (at least for the next couple of years - government mandate).

And there is an increasing number of low cost card accepting terminals out there too...which are very often integrated into the merchant's point of sale.

So what is the need for a digital currency, when your loonies are already stored, accepted and processed digitally, at low cost?

Considering the above I don't understand the value of a digitial currency for use in-store...

Help?

Cheers,

Andrew.