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> This seems to be one potential, actually useful application of blockchain...

No.

Blockchain and anything crypto has absolutely no use case at all other than speculation, please stop suggesting this solution in search of a problem.

One: anonymous[1] method of payment online. Maybe this is not a problem you like, but your statement is trivially false.

[1] pseudonymous (in case of BTC) if we're being pedantic.

This is great use case for criminals.