In the USA at least, it still exists, and it's called cash.
If cash were invented today, it would be illegal. For most small payments if not large transfers, in the USA consumers actually have the right to transact anonymously. Tracking micropayments publicly forever on a blockchain seems like a step backwards. Being able to track large transfers on a blockchain is one of the benefits of living in the world where the Byzantine General's Problem has been solved.
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In the USA at least, it still exists, and it's called cash.
If cash were invented today, it would be illegal. For most small payments if not large transfers, in the USA consumers actually have the right to transact anonymously. Tracking micropayments publicly forever on a blockchain seems like a step backwards. Being able to track large transfers on a blockchain is one of the benefits of living in the world where the Byzantine General's Problem has been solved.