None. It's the banking system :)

Good ol' fiat money, of course. The economic system we have, which enjoys tremendous performance benefits of using interpersonal trust as a heuristic.

Hyperledger, Proof-of-authority, coinless blockchain.

Cryptocurrencies are not one-to-one with blockchain, rather one thing you can do with them.

it sounds a bit like https://faircoin.world/

Stellar, I think