Filecoin.
@OP-Define 'working' first.
A blockchain could be working with not many customers.
Having customers is maybe more important than anything else.
The original question has a wholly dismissive attitude anyway.
You simply want to hear 'none', which is not exactly the case.
i will check filecoin.
with working i mean a sellable product. that gets sold. that has customers. and yes, the attitude is dismissive because i suspect that blockchain is just a database structure and not a technology all by itself.
the sellable part should NOT be the token.
Does bitcoin even meet this definition then?
You're missing the point.
Their mantra is "blockchain, not bitcoin" remember?
Or perhaps, "blockchain, not token" because they believe the token part is irrelevant to the holier than thou blockchain tech. Yet they sell tokens anyway. And without the token they would have nothing.