Part IV

A rule becomes constitutional only when it can run and when the case it cannot settle has somewhere legitimate to go.

Mechanism design begins from a hard-won suspicion of virtue. Institutions should not depend upon officials being unusually good, counterparties volunteering inconvenient truths, or dominant actors choosing restraint after restraint becomes costly. Rules can sometimes arrange incentives, evidence, and committed assets so that candor is safe, defection is expensive, and routine consequences follow without waiting for a later act of will.

The achievement is bounded. A mechanism begins with an objective it did not choose, a representation of the world it did not make, and assumptions whose failure may become visible only after execution. Code can decide whether a declared state transition satisfies a declared rule. It cannot derive the legitimacy of the objective, guarantee the truth of every input, or determine that a formally valid result should govern this person in this circumstance. The precision of the mechanism comes partly from the narrowness of what it is willing to decide.

Part IV therefore separates four constitutional layers. Execution determines what the rule did. Evidence preserves the authority, inputs, versions, and reasons surrounding the act. Governance controls amendment and the institutions allowed to alter the system. Adjudication receives claims the encoded proposition did not settle. A system may be rigorous at one layer and arbitrary at another, with immutable execution beneath a discretionary oracle or perfect receipts before an appeals body that never reverses the issuer.

The penumbra names the ordinary remainder. General rules meet facts they did not anticipate, terms acquire several plausible meanings, and a proof may establish a narrow proposition without settling the requested consequence. Interpretation cannot be abolished by making the core more exact. It can be made answerable. The interpreter should identify what the mechanism settled, what remains open, which authority permits judgment, which evidence and competing readings were considered, and which forum can review the result while reversal still matters.

The exception is a different remainder. Here the ordinary rules no longer seem adequate to the crisis, and someone claims authority to pause, alter, or escape them. Forkability does not remove the sovereign function, because developers, operators, exchanges, foundations, and communities still assemble the available continuations. Its constitutional achievement is smaller and real: one coalition's resolution need not become the only history permitted to continue. Dissent can remain executable, provided the minority can carry enough standing into the new order to make the branch more than a technically valid archive.

Ordinary life after the split requires a further architecture. Protocols, firms, standards bodies, courts, issuers, and states govern different relations in the same transaction. Some jurisdictions are nested beneath shared rules, while others overlap without a common roof. The gravest failures often arise at the seam, where a statement accepted in one system acquires force in another. A bridge, oracle, identity relation, or standard may therefore constitute a jurisdiction of its own, with declared authority, dependencies, evidence, backstops, and recourse.

These institutions also operate on different clocks. Operational systems must respond to attacks, congestion, and invalid messages at speeds no public assembly can match. Constitutional systems must decide which risks may be taken, whose losses receive priority, and which emergency powers survive. The faster layer should preserve the possibility of judgment rather than consume it, buying time under authority granted before the crisis and returning the unresolved question when the immediate danger has passed.

Part IV builds no machine that converts self-interest into justice. It constructs a field in which clear propositions can settle, disputed propositions can enter a forum, exceptional powers can be bounded, and no local institution may quietly enlarge its finality into authority over the whole world. Every mechanism remains vulnerable to capture, every interpreter to guild interest, every emergency office to permanence, and every polycentric order to a chokepoint hidden beneath its visible plurality.

That remainder marks the point at which constitutional architecture yields to human judgment, loyalty, mercy, and political responsibility.

Part V asks what life requires above the floor the architecture can secure.

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A constitution is measured not only by the rule that runs, but by what happens when the case remains.