FileBounty: Fair Data Exchange
Simon Janin, Kaihua Qin, Akaki Mamageishvili, Arthur Gervais

TL;DR
FileBounty is a trust-free, cryptographically secure protocol enabling fair digital content exchange with minimal on-chain transactions, ensuring integrity and incentivizing honest behavior in peer-to-peer markets.
Contribution
It introduces a novel deposit refunding scheme and a protocol that guarantees fair exchange with minimal blockchain interactions, even in multi-party settings.
Findings
Achieves fair exchange with only three on-chain transactions.
Guarantees honest behavior as a subgame perfect Nash equilibrium.
Supports multi-party peer-to-peer file selling.
Abstract
Digital contents are typically sold online through centralized and custodian marketplaces, which requires the trading partners to trust a central entity. We present FileBounty, a fair protocol which, assuming the cryptographic hash of the file of interest is known to the buyer, is trust-free and lets a buyer purchase data for a previously agreed monetary amount, while guaranteeing the integrity of the contents. To prevent misbehavior, FileBounty guarantees that any deviation from the expected participants' behavior results in a negative financial payoff; i.e. we show that honest behavior corresponds to a subgame perfect Nash equilibrium. Our novel deposit refunding scheme is resistant to extortion attacks under rational adversaries. If buyer and seller behave honestly, FileBounty's execution requires only three on-chain transactions, while the actual data is exchanged off-chain in an…
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Taxonomy
TopicsBlockchain Technology Applications and Security · Auction Theory and Applications · Cryptography and Data Security
