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This Week in Blockchain Research Issue #111
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Paper of the Week:
Paper Title: GoAT: File Geolocation via Anchor Timestamping.
Blockchain systems are rapidly gaining traction. Decentralized storage systems like Filecoin are a crucial component of this ecosystem that aim to provide robust file storage through a Proof of Replication (PoRep) or its variants.
However, a PoRep actually offers limited robustness. Indeed if all the file replicas are stored on a single hard disk, a single catastrophic event is enough to lose the file.
This work introduces a new primitive, Proof of Geo-Retrievability or in short PoGeoRet, that enables proving that a file is located within a strict geographic boundary.
Using PoGeoRet, one can trivially construct a PoRep by proving that a file is in several distinct geographic regions.
This work defines what it means for a PoGeoRet scheme to be complete and sound, in the process making important extensions to prior formalism.
GoAT is a practical PoGeoRet scheme to prove file geolocation. Unlike previous geolocation systems that rely on trusted-verifiers, GoAT bootstraps using public timestamping servers on the internet that serve as geolocation anchors, tolerating a local threshold of dishonest anchors.
It internally uses a communication-efficient Proof-of-Retrievability (PoRet) scheme in a novel way to achieve constant-size PoRet-component in its proofs.
GoAT’s practicality is validated by conducting an initial measurement study to find usable anchors and also perform a real-world experiment. The results show that a significant fraction of the internet can be used as anchors and that GoAT achieves geolocation radii as little as 1000km.
Affiliations: * Cornell Tech.
1. Paper Title: Hours of Horus: Keyless Cryptocurrency Wallets.
Summary: A cryptocurrency wallet in which money can be spent using a password alone, and no private keys are required.
Authors: Dionysis Zindros*,
Affiliations: * University of Athens.
Summary: The first paper on anomaly detection in dynamic multilayer networks.
Authors: Dorcas Ofori-Boateng*, Ignacio Segovia Dominguez†, Murat Kantarcioglu†, Cuneyt G. Akcora‡, and Yulia R. Gel†,
1. Paper Title: Manta: a Plug and Play Private DeFi Stack.
Summary: A multi-asset decentralized anonymous payment scheme and an automated market maker (AMM) based decentralized anonymous exchange scheme.
2. Paper Title: SoK: Privacy-Preserving Computing in the Blockchain Era.
Summary: A systematization of knowledge of privacy-preserving solutions in cryptocurrencies and blockchains.
3. Paper Title: Redacting Transactions from Execute-Order-Validate Blockchains.
Summary: The first design for a redactable execute-order-validate blockchain, that grants users with the right to be forgotten.
Summary: A new method to prove the knowledge of an isogeny of given degree between two supersingular elliptic curves.
Authors: Antonin Leroux*,
Affiliations: * Institut Polytechnique de Paris.
Affiliations: * Shanghai Jiao Tong University, † Cryptape, and ‡ Shandong Institute of Blockchain.
1. Paper Title: Conclave: A Collective Stake Pool Protocol.
Summary: A formal design of a Collective Stake Pool, i.e., a decentralized pool with no single point of authority.
2. Paper Title: Multidimensional Byzantine Agreement in a Synchronous Setting.
Summary: A leaderless Byzantine agreement protocol defined for complete and synchronous networks that allows a network of nodes to reach consensus on a vector of relevant information regarding a set of observed events.
Affiliations: * University of Trento.
1. Paper Title: Maximizing Extractable Value from Automated Market Makers.
Summary: This work formally characterizes rational miners as players which follow an optimal strategy in the mining game.
Authors: Massimo Bartoletti*, James Hsin-yu Chiang†, and Alberto Lluch-Lafuente†.
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