1. The one property nothing else has
Bitcoin's supply schedule is fixed, public and enforced by the incentives of everyone who holds it. Twenty-one million units, issuance halving roughly every four years, no committee empowered to change the number in response to a recession or an election. Gold approximates this and fails at the margin: a higher price funds more mining and supply grows.
Absolute scarcity is a genuinely new property for an asset that can also be transferred globally in minutes. Whether that property is worth a trillion dollars or ten is the debate; that it exists and cannot be replicated by issuing another token is the foundation of everything else.

