Reading https://uport.me/library/pdf/whitepaper.pdf it states :

The uPort Registry Contract acts as a logically centralized but physically decentralized registry or lookup
table mapping each uPort identitifier to an IPFS hash linking to a structure containing the user’s attributes,
profile data and attestations (see below for more information on attestations).

From this statement are my interpretation correct :

The Registry contract is physically decentralized as it exists all ethereum mining node within their blockchain ?

The Registry contract is logically centralized as all logic is contained within a centralized location ?

  • Doesn't that apply for many smart-contract based services?
    – q9f
    Commented Nov 22, 2016 at 14:35

1 Answer 1


No centralized location.

I would interpret as logically centralized in the sense that there's one logical address space entrusted with the info. Very different from logically de-centralized profiles stored separately in places like twitter, facebook, domain controllers, stackexchange, et al.

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