Landauer proved gaining certainty is an irreversible physical event.
The second law says irreversible events are what give time its direction.
Take both seriously and the implication is: time does...
That framing maps cleanly onto block confirmation. Each block is a Landauer event — entropy paid, uncertainty resolved, the ledger state permanently collapsed from many possible to one certain. Proof-of-work isn't arbitrary; it's the minimum physical price of buying a definite past. Forgery isn't just cryptographically hard. It's thermodynamically expensive.