This chapter addresses the myth of ‘decentralized governance’ of public blockchains, arguing that certain people who create, operate, or reshape them function much like fiduciaries of those who rely on these data structures. It compares the role of leading software developers and Frankel’s conception of a ‘fiduciary’ and finds much in common, as users place extreme trust in the developers to be both competent and loyal (i.e. to be free of conflicts of interest). The chapter frames the cost–benefit analysis necessary to evaluate whether it is wise to treat these parties as fiduciaries, and outlines key questions needed to flesh out the fiduciary categorization. For example, which software developers are influential enough to resemble fiduciaries? Are all users of a blockchain ‘entrustors’ of the fiduciaries who operate the blockchain, or only a subset of those who rely on the blockchain? The chapter concludes by considering the broader implications of treating software developers as fiduciaries, given the existing accountability paradigm that largely shields them from liability for the code they create.