From panopticons to the partial: digital and blockchain mapping in platform urbanism Clancy Wilmott FOAM provides the tools to enable a crowdsourced map and decentralized location services. (foam.space, 2019) Hyperion, a decentralized map platform, aims to achieve the “One Map” vision – to provide an unified view of global map data and service, and to make it universally accessible just like a public utility for 10B people. (hyn.space, 2019) Introduction Digital maps form a significant part of the apparatus of platform urbanisms. Their presence can be found across multiple scales, from the city-wide to the personal (Leszczynski, 2019). They are, for instance, crucial to the display and calculation of urban data in large informatics dashboards found in cities such as Sao Paolo (Mattern, 2015) while also forming a fundamental component of the mechanics of many platform economies, including ride-share, bike-share and delivery services at the person-to-person scale of the mobile phone application (Richardson, 2015). As the technologies of digital mapping transform they influence the political and infrastructural impact of platforms on urban spaces and lives. This chapter considers the political consequences of the emerging application of blockchain technologies, as decentralised, write-only, peer-to-peer, cartographic and geolocative services to digital mapping in platform urbanisms. This includes the tension between top-down traditional cartographic structures and peer-to-peer exchange, the ethics of visibility and open location data as a mechanism for transparency, the dependence on universal systems of participation, and the question of responsibility in decentralised systems that are both digital and material. Rodgers and Moore (2018) argue that although conceptual understandings of platforms and infrastructures are increasingly intertwined in urban discourses, thinking of platforms as a kind of ‘doing’, rather than simply ‘a thing’ allows for understanding the platform as a situated action that is cultural, social and political – as well as economic. Platform urbanisms, characterized by location- specific and real-time digital production of urban spatial relationships (whether economic, social, cultural or political), depend on digital mapping, which provides a crucial bridge between the material processes of the city and the digital or online world. This occurs across multiple forms: the use of cartographical interfaces within mobile, wearable or desktop applications (Lammes and Wilmott, 2016); urban dashboards used for planning, governance and decision-making (Mattern, 2015); and back-end data cartographies such as geocoded place names (Zook and Graham, 2007). Digital mapping, as a mode of spatially datafied ‘doing,’ is key to constructing the real-time city (Kitchin,