Registering originative business contracts allows entrepreneurs and creditors to choose, and courts to enforce market-friendly “contract” rules that protect innocent third parties when adjudicating disputes on subsequent contracts. This reduces information asymmetry for third parties, which enhances impersonal trade. It does so without seriously weakening property rights, because it is rightholders who choose or activate the legal rules and can, therefore, minimize the cost of any possible weakening. Registries are essential not only to make the chosen rules public but to ensure rightholders’ commitment and avoid rule-gaming, because independent registries make rightholders’ choices verifiable by courts. The theory is supported by comparative and historical analyses.