The Chain of Existence: The Unidirectionality of Time and the Existential Topology of Optimal Computational Power The topological structure of life is highly isomorphic to Bitcoin's "Heaviest Chain" rule at its core logic. Life is a non-self-referential system built upon the absolute arrow of time: it cannot be falsified in parallel realities, nor can it be proven through logical assumptions. The only objectively existing entity is the irreversible, unique timechain that the subject is currently experiencing. Since we cannot step outside the system of life to observe it from a god-like external perspective, the trajectory of life cannot be deduced—it can only be established through tangible "computation" (lived experience). This unidirectionality of time fundamentally deconstructs Hamlet's classic dilemma on both physical and philosophical levels. "To be or not to be" is not a Schrödinger-like superposition state but rather a single, irreversible collapse of the wave function. On the real timechain, we are never "choosing" between two paths; we can only "walk" one path. No matter which form of existence you lean toward, the untraveled fork will instantly become an "orphan block," abandoned by the network due to the lack of life energy (computational power) to continuously confirm it. Irreversibility means that life has no counterfactuals—the road not taken has no physical or causal connection to the real you. Since the macroscopic time path has one and only one irreversible heaviest chain, where does free will reside? The answer lies in the "local computational power" invested at each discrete time node. Satoshi Nakamoto's definition of "The best effort" (maximum proof of work) in the consensus mechanism is a brilliant scientific mapping of human free will. While we cannot defy the unidirectional progression of time, we absolutely have control over the computational power at our disposal in the present moment—our effort, focus, and depth of cognition in facing life. All past experiences and accumulations, as confirmed and immutable UTXOs (Unspent Transaction Outputs), provide the initial potential energy for actions in the present. At every moment in life, pouring in "The best effort" and maximizing the computational power of our cognition and actions is the only solution to counteract the entropy increase of the life system. The ultimate meaning of life lies in this continuous, relentless burning of computational power, forging an irreplaceable "heaviest chain" and reaping the ultimate reward bestowed by existence itself.