[45h34jh53k4j]

a block is just a header, a ref to the previous block, a set of tx's and a nonce to satisfy the work function.

It being digital is just its encoding. An analog cryptocurrency could be carved into trees or anything.

[avian]

Are you confusing digital with electronic? Ones and zeros carved into a tree are still a digital record. Digital refers to the fact the you operate on a set of discrete values, in contrast to a continuum of values. Medium is irrelevant.

Just to be clear. I do agree with the argument above that "cryptocurrency" is a much more fitting term than "digital currency".

[45h34jh53k4j]

Yeah, I think I am confusing the two.

I suspect there are chemical compounds that when reacted can perform analog arithmetic. If you used that to create signing, hashing and propagation logic I dare say analog cryptocurrencies could exist.