This sounds horrible. You could basically monitor anyone with a wallet in a highly populated area and track them super easily by doing facial recognition. Yes you could photograph people but it's way more burdensome. Sorry to go off topic a little.

On Feb 5, 2015, at 3:50 PM, Mike Hearn <mike@plan99.net> wrote:

I'm imagining myself walking around broadcasting my photo and MAC
address while hucksters push payment requests to me for approval

I hate to break it to you, but you broadcast a photo of your face every time you walk outside ;)

Bluetooth MAC addresses are random, they aren't useful identifiers. If someone can see you, a face is a far more uniquely identifying thing than a MAC.

"Payment spam" might be a problem. I can imagine a wallet requiring that such requests are signed and then spammers can be blacklisted in the usual fashion so they can't push things to your phone anymore. Anyway, a hurdle that can be jumped if/when it becomes an issue.

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