Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NECTAR: Non-Interactive Smart Contract Protocol using Blockchain
  Technology   Blockchain-driven technologies are considered disruptive because of the
availability of dis-intermediated, censorship-resistant and tamper-proof
digital platforms of distributed trust. Among these technologies, smart
contract platforms have the potential to take over functions usually done by
intermediaries like banks, escrow or legal services. In this paper, we
introduce a novel protocol aiming to execute smart contracts as part of a
blockchain transaction validation. We enable extensions in the execution of
smart contracts while guaranteeing their privacy, correctness and
verifiability. Man-in-the-middle attacks are prevented, since no communication
between participants is requested, and contract validations do not imply the
re-execution of the code by all the nodes in the network. However, proofs of
correct execution are stored on the blockchain and can be verified by multiple
parties. Our solution is based on programming tools which optimize the time
execution and the required memory while preserving the embedded functionality.

3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin