Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FileBounty: Fair Data Exchange   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 efficient and
privacy-preserving manner. We moreover show how FileBounty enables a flexible
peer-to-peer setting where multiple parties fairly sell a file to a buyer.

17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom