Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Blockchain-based Flight Data Recorder for Cloud Accountability   Many companies rely on Cloud infrastructures for their computation,
communication and data storage requirements. While Cloud services provide some
benefits, e.g., replacing high upfront costs for an IT infrastructure with a
pay-as-you-go model, they also introduce serious concerns that are notoriously
difficult to address. In essence, Cloud customers are storing data and running
computations on infrastructures that they can not control directly. Therefore,
when problems arise -- violations of Service Level Agreements, data corruption,
data leakage, security breaches -- both customers and Cloud providers face the
challenge of agreeing on which party is to be held responsible. In this paper,
we review the challenges and requirements for enforcing accountability in Cloud
infrastructures, and argue that smart contracts and blockchain technologies
might provide a key contribution towards accountable Clouds.

20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th