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How do members of a decentralized technical community reduce uncertainty and resolve conflict during deliberative, consensus-based decision-making? This paper examines the cultural mechanisms through which an open network of software developers maintains complex infrastructure without votes or hierarchical authority. Drawing on 56 expert interviews with coordinators, researchers and developers working on the Ethereum blockchain’s core protocol, digital archival analysis, and ethnographic fieldwork, I identify three mechanisms through which this community forecloses alternatives, closes debates, and coordinates action. First, a collectively maintained ‘roadmap’, whose categories and temporal horizons discipline collective imagination, renders some futures thinkable and others negligible. Second, a set of quantified metrics and simulated testing environments are collectively maintained and function as boundary objects, making projected outcomes tangible and contestable across heterogeneous subcommunities. Finally, a shared and embodied temporal rhythm – a cyclical sequence of phases and events from proposal selection to the collective effervescence of observing a coordinated network upgrade – repeatedly helps participants close deliberation through the pressure of pace rather than the exercise of authority. Contrasting accounts of technology communities organizing around projected futures through hype and acceleration, Ethereum’s temporal logic operates through deceleration, cyclicality, and ritualized patience.