> The reserve cryptocurrency of the internet needs to be fast and offer cheap transactions

The most important things about any cryptocurrency are decentralization and censorship-resistance. Without those two, you might as well be running a PayPal clone in a datacenter. That way, you get the fastest and cheapest transactions possible.

> so that it can easily and cheaply be moved between exchanges.

Exchanges can set up big payment channels between one another and do instant Bitcoin transfers. However, since they operate in a regulatory environment, this may never happen.

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