Note that both use cases (decentralized global currency and smart contracts) rely on altruism which cannot be guaranteed by human actors but is entirely determi

Note that both use cases (decentralized global currency and smart contracts) rely on altruism which cannot be guaranteed by human actors but is entirely deterministic within the chaos of humanity (with a sufficient number of honest actors) using a blockchain. That is the value prop: distributed consensus with "quick" convergence toward an agreed upon truth.