This analogy is completely apt, and may be more than that. "The condition of flowing" from currens and currere, gives us currents, in water, which not only flows, it carries. It also gives us the current, in electricity, which flows, and carries. It is also said, in the human energy arts, that where attention goes, energy flows, and chi not only flows, but carries, and even has a bio-electrical component.

Currency, flows and carries value from one person to the next, but would not without attention. Cryptocurrency could exist without electricity, but would be immensely more difficult. So ideally, cryptocurrency has a component of both electricity and attention. Additionally, time is also said to flow. Attention is application of energy over time. It is also said that time is money. I'm not too sure about that, let alone time being currency, but it does seem related.

There appears to be much to learn by using these analogies, and seeing the commonalities among water (fluid dynamics), electricity (energy), currency, and attention.

Reasoning by analogy can be troublesome, but use of analogy can sometimes be elucidating.