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Starkware

Scalability and Privacy in Blockchains

StarkWare will improve scalability and privacy in blockchains using STARK technology, providing cryptographic proofs that are zero-knowledge, succinct, transparent (no need for a trusted setup), and post-quantum secure. StarkWare will develop a full proof stack: software and hardware to support fast and reliable generation and verification of computational integrity proofs for general computations.

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About Starkware

Human dignity demands that personal information, like medical and forensic data, be hidden from the public. But veils of secrecy designed to preserve privacy may also be abused to cover up lies and deceit by institutions entrusted with Data, unjustly harming citizens and eroding trust in central institutions. Zero knowledge (ZK) proof systems are an ingenious cryptographic solution to this tension between the ideals of personal privacy and institutional integrity, enforcing the latter in a way that does not compromise the former.

Public trust demands transparency from ZK systems, meaning they be set up with no reliance on any trusted party, and have no trapdoors that could be exploited by powerful parties to bear false witness. For ZK systems to be used with Big Data, it is imperative that the public verification process scale sublinearly in data size. Transparent ZK proofs that can be verified exponentially faster than data size were first described in the 1990s but early constructions were impractical, and no ZK system realized thus far in code (including that used by crypto-currencies like Zcash™) has achieved both transparency and exponential verification speedup, simultaneously, for general computations. Here we report the first realization of a transparent ZK system (ZK-STARK) in which verification scales exponentially faster than database size, and moreover, this exponential speedup in verification is observed concretely for meaningful and sequential computations, described next.

Our system uses several recent advances on interactive oracle proofs (IOP), such as a “fast” (linear time) IOP system for error correcting codes. Our proof-of-concept system allows the Police to prove to the public that the DNA profile of a Presidential Candidate does not appear in the forensic DNA profile database maintained by the Police. The proof, which is generated by the Police, relies on no external trusted party and reveals no further information about the contents of the database, nor about the candidate’s profile. In particular, no DNA information is disclosed to any party outside the Police. The proof is shorter than the size of the DNA database and verified faster than the time needed to examine that database natively.

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