Watch / Decentralized Identity & Reputation

Decentralized Identity & Reputation

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Decentralized Identity & Reputation

Duration: 00:26:16

Speaker: Sina Habibian

Type: Talk

Expertise: Intermediate

Event: Devcon 4

Date: Oct 2018

Since leaving Truebit, I have been focused on the problem of decentralized identity and reputation. This is an important missing primitive that enables some of the most exciting blockchain use-cases: governance (e.g. quadratic voting), airdrops, unsecured unchain lending, and security tokens. Reputation enables protocols to utilize iterated games instead of one-off games; and identity enables much better UX for usage of dapps. I would like to give a 20 minute presentation on our research into identity and reputation. I will begin by demonstrating the importance of reputation in the pseudonymous decentralized context, present the possible architectures under consideration (1) based on trust graphs and PageRank, 2) based on social collateral, and 3) based on attestations made by anchors, and finally discuss open problems in order to engage the attendees on this topic going forward. Our recent breakout session in San Francisco (with engineers from Metamask, Dharma, Protocol Labs, and Google Brain) demonstrates some of our latest thinking on this topic! –


About the speakers


Sina Habibian


I was formerly the engineering lead at Truebit, a protocol for verifiable offchain computation for scalability on Ethereum. I developed the first implementation (link below), wrote our WebAssembly virtual machine spec (link below). I also helped launch ETHPrize ( to help pinpoint open problems in the Ethereum ecosystem and fund resources towards them. I have presented on scalability at numerous conferences – EthDenver, the San Francisco and Silicon Valley Ethereum Meetups, Ethcc, amongst others (links below). • Truebit demo by me:<div></div> <div></div> • Truebit WebAssembly VM spec: • Our presentation at Ethcc on ETHPrize: <div></div> <div></div> • Truebit’s approach to scaling at ScalingNow conference: <div></div> <div></div> • My website: • My twitter: • My Github:

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