If you need proof-of-work for value to not reject an interaction as automated / meaningless, just use a Hashcash header, which is where Bitcoin got started anyway.
The problem is that the cost of a hash is several orders of magnitude more expensive on a mobile phone, than when using a specialized chip. Money, however, costs the same to everyone.
I predict that if hashcash ever becomes widely used, people will start trading hashes for money. Ie. instead of wasting 30 seconds of battery power to create a hashcash header on your mobile phone, you'd pay 1 cent to a service that does it for it. And this is exactly what Bitcoin does already.
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If you need proof-of-work for value to not reject an interaction as automated / meaningless, just use a Hashcash header, which is where Bitcoin got started anyway.
The problem is that the cost of a hash is several orders of magnitude more expensive on a mobile phone, than when using a specialized chip. Money, however, costs the same to everyone.
I predict that if hashcash ever becomes widely used, people will start trading hashes for money. Ie. instead of wasting 30 seconds of battery power to create a hashcash header on your mobile phone, you'd pay 1 cent to a service that does it for it. And this is exactly what Bitcoin does already.