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The challenge to establish and verify human identity over the Internet in asecure and privacy-respecting way is long-standing. In this paper, we explorethe blockchain trilemma of scalability, security, and decentralization in thecontext of the Trust Registry: a root of trust for a decentralized identityscheme that enables read and write access to shared records and istamper-resistant. We make a case study of Hyperledger Indy -- an open-sourcetechnology bespoke for decentralized identity -- and conduct two empiricalexperiments to measure the latency of more than 45,000 transactions in thenaturalistic environment of Amazon Web Services. We conclude that issues ofTrust Registry scalability have multiple facets. While Hyperledger Indycaptures data useful to underpin a decentralized identity scheme, the knock-oneffect of its scalability limitations may indeed place constraints onproperties of security and decentralization. The current credentialverification process relies on transaction processing by a ledger withtransaction processing bottlenecks, which may constrain the ideal ofnon-repudiation.

A Note on the Blockchain Trilemma for Decentralized Identity: Learning from Experiments with Hyperledger Indy