This Here they have discussed network security protocol. The

This
paper provides an overview of the industry. A brief history of digital
currencies, which shifts into a discussion of Bitcoin. It provides detailed
analysis of coin economics, dividing the major currencies by their network
security protocol mechanisms, and discussing the long term theoretical
implications that these classes entail. Here they have discussed network security
protocol. The mechanisms are discussed in the order that follows. Also discussion
on the proof of work mechanism used in the Bitcoin protocol and various all
coins, their proof of stake  protocol
scheme first introduced by Peer coin in 2011, which relies on a less energy
intensive security mechanism than Power of Work. They have discussed a hybrid Power
of work or power of stake mechanism. They presents the results of a systematic
review of twenty one crypto currencies. They provides summary of aspects affecting
industry growth, focusing heavily on the monitoring environment in public
perception and acceptance of crypto currency as a payment system in the current
trade environment. It also concludes the analysis note on sources because the crypto
currency industry is still young and factors that impact it are changing on a
daily basis, few complete or fully updated academic sources exist on the topic.
While academic work was of course consulted for this project, the majority of
the information that informs this paper was derived from White Papers or combined
using raw data. A note on terminology: When used in its theoretical or generous
sense, “Bitcoin” will be capitalized, but when used in its unit sense, it will not
be that is “Bitcoin protocol versus 2,000 bitcoin”. The abbreviation “BTC” will
also be used to refer to Bitcoin units. All other coins will be referenced by
their capitalized names.

The crypto currency industry is rapidly
moving forward. Further, the industry has expanded dramatically in the number
of coins currently in circulation. Here a survey has been conduct for
monitoring transaction of Bitcoin, per day its rate in how many countries
people have purchased it etc.

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(Nakamoto,
2008)Commerce on the Internet has come to
rely almost exclusively on financial institutions serving as trusted third
parties to process electronic payments. While the system works well enough for most
transactions, it still suffers from the inherent weaknesses of the trust based
model. Completely non-reversible transactions are not really possible, since
financial institutions cannot avoid mediating disputes. The cost of mediation
increases transaction costs, limiting the minimum practical transaction size
and cutting off the possibility for small casual transactions, and there is a
broader cost in the loss of ability to make non-changeable expenditures for
nonreversible services. With the possibility of reversal, the need for trust
spreads. Traders must be suspicious of their customers, irritating them for
more information they need. A certain percentage of fraud is accepted as
unavoidable. These payment doubts can be avoided by using physical currency,
but no mechanism exists to make payments over a transport network system not
involving trusted party. The need of an automated expense system created on
cryptographic evidence instead of trust that allows two agreeable parties to deal
direct without the need of trusted third party. Transactions that are
computationally unrealistic to inverse protects seller from frauds, routine
mechanisms could be easily implemented for protecting buyers. In this paper, we
propose a solution to the double-spending problem using a peer to peer
distributed timestamp server to generate computational proof of the
chronological order of transactions. The system is secure as long as nodes mutually
control more Central Processing Unit power than any cooperating group of attacker
nodes.

 

A peer to peer type of automated cash
which allow online payments to be sent directly to one another without using any
economic organization. Digital signatures provide part of the solution,
benefits are lost if a third party still requires to prevent double spending. The
network timestamps dealings by hashing them into chain of hash-based proof of work,
forming a record that cannot be changed without redoing the proof-of-work. The
longest chain not only serves as proof of the sequence of events witnessed, but
proof that it came from the largest pool of Central Processing Unit power. As long
as a majority of Central Processing Unit power is organized by nodes that are
not cooperating for attacking the network, they generate the longest chain and overtake
foes. The network itself requires least arrangement. Messages are broadcast and
nodes can leave and rejoin the network, by accepting the longest proof of work
chain.

(T. Courtois, Emirdag, & A. Nagy, 2014)Current bitcoin
is taking a number of clear and well-known practical problems such as
acceptance of slow transactions, large storage at network nodes, reduced privacy,
high unpredictability, cyber-attacks some of them are discussed. In this paper
fast transaction acceptance of bitcoin and other crypto currencies are
discussed.  Presently users have to time
lag for minimum ten minutes even more for larger transactions for avoiding
being a victim of double spending attack. Some essential questions in this
paper. a) Can a decentralized network centralized power will indicate and command
slow transactions? b) How much times a Bitcoin trades be made faster? c) Could
bitcoin be fixed at a lowest price?

Bitcoin
a crypto currency, that is distributed peer to peer economic system. It is an
electronic system which manages the ownership of a severely stable resource of intangible
transferable

units
which really works as a distributed belongings record or digital signatory facility.
This is quite different than handling the possession of shares in old-fashioned
economic markets. Modern financial institutes increasingly just do not trust
each other, they build co-operative vigorous and distributed and increasingly opaque,
electronic systems which are and able to both serve the different objectives of
participants (e.g. traders) and uphold certain security policies. Is Bitcoin
actually so brilliant to be called the Internet of money as it is sometimes claimed?
Not just the speed, tremendous least latency trades are a rule in the economic industry even normal people have
admittance to fast bank transfers and actual credit card transactions. Bitcoin leftovers
somewhat the horse gait of money. Fast transaction acceptance in bitcoin and
other crypto currencies has been discussed in this paper. Bitcoin needs some
changes in order to fulfil the most needs of modern customers.