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.
It being digital is just its encoding. An analog cryptocurrency could be carved into trees or anything.
Just to be clear. I do agree with the argument above that "cryptocurrency" is a much more fitting term than "digital currency".
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.