Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SklCoin: Toward a Scalable Proof-of-Stake and Collective Signature Based
  Consensus Protocol for Strong Consistency in Blockchain   The proof-of-work consensus protocol suffers from two main limitations: waste
of energy and offering only probabilistic guarantees about the status of the
blockchain. This paper introduces SklCoin, a new Byzantine consensus protocol
and its corresponding software architecture. This protocol leverages two ideas:
1) the proof-of-stake concept to dynamically form stake proportionate consensus
groups that represent block miners (stakeholders), and 2) scalable collective
signing to efficiently commit transactions irreversibly. SklCoin has immediate
finality characteristic where all miners instantly agree on the validity of
blocks. In addition, SklCoin supports high transaction rate because of its fast
miner election mechanism

6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: eess
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat