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This is actually a really cool idea, thanks for sharing! With pubkey authentication you could even generate a new QR code for each box of food and sign it again
by solotronics 7y ago
This is actually a really cool idea, thanks for sharing! With pubkey authentication you could even generate a new QR code for each box of food and sign it against the master for a company. Really cool!
- beagle3 7y agoThe problem with this (and GPs idea) is that you can copy a valid code from somewhere else; a "replay attack" of sorts. You have to somehow tie the signature to a verifiable but uncopyiable trait which is much, much harder than you'd expect.
- solotronics 7y agoI'm not 100% sure this would work but possibly you could see a chain of custody of the product. If it says "I was delivered to Kroger yesterday. I was distributed by Kroger to grocery store #123 today. I was placed on the shelf by employee Bobby Circuits two hours ago." it would be hard to fake this
- beagle3 7y agoOnly if every participant along the way played along and was dependable. You are talking 10 distribution levels and hundreds of employees. Good luck with establishing such a system, blockchain or not. Bitcoin works because you don’t need trust, not because everyone is trustworthy.