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AirBnB wants to use the blockchain

Some months ago Don Tapscott, author of Blockchain Revolution book, explained how blockchain technology could replace services like Uber and AirBnB.
airbnb, blockchain, blecharczyk, city am,
In fact, at the World Economic Forum (WEF) held in Switzerland, Tapscott suggested:

 

“Why do you need a 60 billion dollar corporation called Uber? You can have a real sharing economy which it would be a distributed application on the Blockchain […] and the same is for AirBnb”.

 

AirBnB replies…

 

Well, even if might not be because of Tapscott’s suggestions, AirBnb is now interested in using the blockchain technology for its service.
During a recent interview conducted by City A.M., in fact, Airbnb co-founder Nathan Blecharczyk annonunced the possible blockchain application among the company plans for this year.
These were Blecharczyk words:

 

“I think that, within the context of Airbnb, your reputation is everything, and I can see it being even more so in the future, whereby you might need a certain reputation order to have access to certain types of homes. But then the question is whether there’s a way to export that and allow access elsewhere to help other sharing economy models really flourish. We’re looking for all different kinds of signals to tell us whether someone is reputable, and I could certainly see some of these more novel types of signals being plugged into our engine”.

 

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Amelia Tomasicchio

Bitcoin’s Monthly Recap of August 2015

Welcome to HolyTransaction’s eight monthly recap for the year 2015. This past month of August has seen a divided community and increased discussion and involvement from all the Bitcoin industry; during that time, the bitcoin price fell from a high of $280.19 on August 1st to a low of $229.86 on July 31st, according to Bitcoin exchange Bitstamp.
 
Failed Bitcoin Exchange Mt. Gox CEO Mark Karpeles Arrested in Japan
Earlier this month, Mt. Gox’s CEO Mark Karpeles was arrested in Japan in connection with his failed Bitcoin exchange. Mt. Gox was notably Bitcoin’s first major exchange and its downfall in 2014 rocked the industry. Karpeles first claimed that the missing millions from Mt. Gox were taken by a hacker, but he has not admitted to adjusting and misusing customer funds. Now that Karpeles is in Japanese police custody, many are hoping that justice will be served and the truth will come to light.
 
HolyTransaction and other Companies Leave New York Due to BitLicense
HolyTransaction and many other Bitcoin companies, notably Bitocin exchanges such as BitFinex, have banned users with New York IP addresses. The infamous New York Department of Financial Services BitLicense required companies to apply by an August date. Instead of spending the money to pay this “troll tax” a handful of Bitcoin companies have decided to warn NY users away instead.
 
Bitcoin Gains Ground Down Under
The Australian Senate Economics Reference Committee released a report in early August that took a deep look at Bitcoin. the report was titled “Digital currency – Game changer or bit player.” Australia notably enacted then rescinded a GST tax on Bitcoin transactions, an action that curbed the growth of the Bitcoin industry in Australia for awhile. Australian Labor Senator Sam Dastyari commented on Bitcoin’s renewed opportunity in Australia: “Without a doubt, the main benefit will be the confidence and certainty that removing a GST will provide to our own digital entrepreneurs, and the foreign businesses who want to set up here.”
 
Blocksize Debate Rages Between BIP 101, BIP 100, and Bitcoin XT
Different companies, developers, miners, and full node runners have all voiced their opinion on how to raise the Bitcoin blockchain block size. While companies like BitPay and Blockchain.info prefer BIP 101 for the block size increase, mining pools are casting their votes for BIP 100. Meanwhile, Gavin Andresen and Mike Hearn are still pushing for Bitcoin XT. In reality, the Bitcoin network will make its decision the way it always has: through decentralized consensus. Most recently, Bitcoin’s developers (minus Andresen and Hearn) have signed an open letter to the Bitcoin community promising to come to a technical consensus on Bitcoin scalability.

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Satoshi
TryBTC bitcoin starters guide

10 things you should know about Bitcoin and digital currencies

After reading these 10 things to know about the confusing world of digital currencies, you’ll feel confident joining the conversation.
1. The difference between virtual, digital, and cryptocurrencies
(TechRepublic) Virtual currencies were developed because of trust issues with financial institutions and digital transactions. Though they aren’t even considered to be “money” by everyone, virtual currencies are independent of traditional banks and could eventually pose competition for them.
First, there are three terms that are sometimes used interchangeably that we need to sort out: virtual currency, digital currency, and cryptocurrency.
Virtual currency was defined in 2012 by the European Central Bank as “a type of unregulated, digital money, which is issued and usually controlled by its developers, and used and accepted among the members of a specific virtual community.” Last year, the US Department of Treasury said that digital currency operates like traditional currency, but does not have all the same attributes — as in, it doesn’t have legal tender.
Digital currency, however, is a form of virtual currency that is electronically created and stored. Some types of digital currencies are
cryptocurrencies, but not all of them are.
So that leads us to the more specific definition of a cryptocurrency, which is a subset of digital currencies that uses cryptography for security so that it is extremely difficult to counterfeit. A defining feature of these is the fact they are not issued by any central authority.
2. The origin of Bitcoin
Bitcoin is a cryptocurrency, a number associated with a Bitcoin address. In 2008, a programmer (or group of programmers) under the pseudonym Satoshi Nakamoto published a paper describing digital currencies. Then in 2009, it launched software that created the first Bitcoin network and cryptocurrency. Bitcoin was created to take power out of the hands of the government and central bankers, and put it back into the hands of the people.
There are currently about 12 million Bitcoins in circulation, though when it was created, the programmer said there is a finite limit of 21 million Bitcoins out there. They are currently valued at around $460 each, according to Bitcoin Charts, which tracks the activity. The value surged as high as $1000 each in December 2013.
3. The origin of Dogecoin
Dogecoin is a form of cryptocurrency that was created in December 2013. It features Doge, the Shiba Inu that has turned into a famous internet meme. It was created by Billy Markus from Portland, Oregon, who wanted
to reach a broader demographic than Bitcoin did. As of March, more than 65 billion Dogecoins have been mined, and the production schedule of this
cryptocurrency is in production faster than most.
Earlier this year, the Dogecoin community raised funds for the Jamaican bobsled team to attend the 2014 Winter Olympics when they could not afford to go. The community also raised 67.8 million coins (about $55,000) to sponsor NASCAR driver Josh Wise, who drove the Doge-themed car in several races.
Because there’s a lot of them, Dogecoin is valued pretty low — 1,000 Dogecoins are worth $0.46.
4. Other types of digital currencies
There are other types of digital currencies, though we don’t hear much about them. The next most popular is probably Litecoin, which is accepted by some online retailers. It was inspired by Bitcoin and is nearly identical, but it was created to improve upon Bitcoin by using open source design.
There are many other types of cryptocurrencies, such as Peercoin, Ripple, Mastercoin, and Namecoin. Cryptocurrencies get some flack because they are often replicates of other versions, with no real improvements.
5. Bitcoin regulations
Who is in charge of Bitcoin? The point of the currency is that it is decentralized, but there are legalities that differ in every country. Law enforcement and tax authorities are concerned about the use of this cryptocurrency because of its anonymity and the ease of using it for money laundering and other illegal activities. Bitcoin was the prime currency on Silk Road, which was used to sell illegal goods, including drugs. It was shut down in 2013 by the FBI.
The US Security and Exchange Commission (SEC) hasn’t yet issued specific
regulations on digital currencies, but it often warns about investment schemes and fraud. The Financial Crimes Enforcement Network (FinCEN), an agency under the Department of Treasury, took initiative and published virtual currency guidelines in 2013. Many countries are still deciding how they will tax virtual currencies. The IRS is specifically concerned with virtual currencies being used for unreported income.
6. How Ben Bernanke changed the Bitcoin game
In late 2013, the first congressional hearing on virtual currency was held to
outline the pros and cons of Bitcoin. The hearing ended up providing a
financial boost for the currency, because US officials talked about it as a
legitimate source of money, as opposed to only discussing its role in illegal
activities.
Although he didn’t attend, Federal Reserve Chairman Ben Bernanke said in a letter to US senators that virtual currencies “may hold long-term promise, particularly if the innovations promote a faster, more secure, and more efficient payment system.” Bitcoin, which was valued around $13 in the beginning of 2013, jumped sharply after news of his comments broke.
7. How to get Bitcoins
There are three ways you can get Bitcoins: buy them on an exchange like HolyTransaction, accept them for products and services, and mine them. We’ll get to the latter process in the next section.
To start, download a Bitcoin wallet. There are many websites where you can download an app on your phone or computer to store Bitcoins. MultiBit is an app you can download for Windows, Mac and Linux. Bitcoin
Wallet
for Android runs on your phone or tablet. To store the Bitcoins, you have three options:
1. Desktop wallets leave you responsible for protecting the currency and
doing your own backups.
2. Mobile wallets allow you to travel with the Bitcoins anywhere, and you
are responsible for them. Mobile apps allow you to scan a QR code or tap to
pay.
3. Web wallets are transacted through a third party service provider. If
anything happens on their side or it gets hacked, you run the risk of losing
the Bitcoins, so extra backups and secure passwords are suggested.
Problem
is, Bitcoins can be stolen in huge quantities, just like money, and with no
centralized bank, there’s no way to recoup the losses. There are several types of Bitcoin ATMs, which exchange Bitcoins for flat currencies. Most machines are expensive and rare, ranging from $5,000 to $2,000. Skyhook,
a Portland, Oregon-based company, demoed a $1,000, machine at a conference this month. It is the first portable, open source ATM.
8. How to mine for Bitcoins
It’s like mining for gold, just on the computer. You need a Bitcoin wallet and
specific software, which is free and open source. The most popular is GUIMiner, which searches for the special number combination to unlock a transaction. The more powerful your PC is, the faster you can mine. In the early days, it was easy to find Bitcoins, and some people found hundreds of thousands of dollars worth of the cryptocurrency using their computers. Now, though, more expensive hardware is required to find them. Each Bitcoin blockchain is 25 Bitcoin addresses, so it takes a lot of time to find them on your own. The exact amount of time ranges depending on the hardware power, but mining all day could drive your energy bill up and only mine a tiny fraction of a Bitcoin — it may take days to mine enough to purchase anything.
To tackle that problem, there are now mining pools. Miners around the world can band together to combine the power of their computer systems and then share the profits between participants. The most popular one is Slush’s Pool, where smaller, more steady payouts are given instead of a lump sum.
9. Where you can use Bitcoin
There are many places you can use Bitcoin to purchase products or services. There’s no real rhyme or reason to the list, which includes big corporations and smaller, independent retailers including bakeries and restaurants. You can also use the currencies to buy flights, train tickets, and hotels on CheapAir; upgrades to your OK Cupid profile; products on Overstock.com; gift cards on eGifter. There’s a list on SpendBitcoins that shows all the places that accept the cryptocurrency.
10. The future of virtual currency
The value of Bitcoin has fluctuated drastically throughout the last year, and there are still 9 million of the coins out there in cyberspace. However, many
security issues remain, and that will continue to be a problem. In 2013, Mt. Gox, a Japanese exchange, handled 70% of all Bitcoin transactions, but they lost some 750,000 Bitcoins in February 2014 and filed for bankruptcy, and nothing has been proven in the case. Since it’s universal, it’s useful for international transactions, and could be helpful for transactions in developing countries.
Some experts suggest putting a few aside if you have them and see what happens in the coming months and years, because there are sure to be regulations on the currency soon. With businesses jumping on the bandwagon and investors becoming interested in cryptocurrency, look for momentum to grow, but it will take time for the situation to stabilize as governments, the international community, and the people of the internet decide on how the next generation of currency will transition to a digital world.

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Satoshi
blockchain_healthcare

A Network analyst’s view of the Blockchain

Martin Harrigan is a computer scientist and software developer. He is the founder of QuantaBytes, an Irish startup developing a suite of tools for analyzing and visualising bitcoin’s block chain. He is also the co-author of one of the earliest academic papers to study the network properties of the block chain and its implications for anonymity.

abstract network
(CoinDesk) The
block chain is a decentraliced, consensus-driven ledger of every
successful bitcoin transaction to date. As of the 300,000th block, the
ledger includes over 38 million transactions.
Aside from being a
monumental technical achievement, the block chain is a fascinating
dataset. We can use it to create a transaction network that models the
flow of bitcoins from the creation of the genesis block to the present
day.
In this network, every node represents a transaction, and
every (directed) edge represents a flow of bitcoins from an output of
one transaction to an input of another. This large, complex network has
over 38 million nodes and 85 million edges.
transaction network
The transaction network represents the flow of bitcoins between transactions over time.
Network science
Network
science is the study of complex networks. It provides theories,
techniques and tools that help us understand the structure and evolution of a network.
The bitcoin transaction network is a prime example. Its basic building
block, the transaction, can be combined to produce complex transfers of
value. This is reflected in the topological structure of the transaction
network.
The network as a whole is too large and complex for most
network visualisation tools. However, we can measure various structural
properties of the network. For example, transactions can be
characterised by their varying numbers of inputs and outputs. But how
are these numbers distributed in practice? In the transaction network,
we can analyse the in- and out-degrees of the nodes. We can plot the in-
and out-degree distributions. They show, for each possible degree, the
number of times they occur in the network.
The in-degree distribution of the transaction network
The in-degree distribution of the transaction network.
The out-degree distribution of the transaction network.
The out-degree distribution of the transaction network.
In
both cases, we observe inverse relationships between these numbers. The
lower the degree, the more frequently the nodes with that degree occur;
the higher the degree, the less frequently they occur. There are many
outliers. The outlier in the out-degree distribution with out-degree
equal to two is due to an abundance of transactions with exactly two
outputs.

Giant connected component

Suppose we were able to
visualise the entire bitcoin transaction network. It would probably
resemble a “hairball”. These visualisations suffer from cluttering and
over-plotting to an extreme that makes them unusable for any practical
purposes. However, they do provide one key piece of information. Are we
dealing with one large connected component or several smaller connected
components?
Many visualizations of large networks are "hairballs".
Many visualizations of large networks are “hairballs”.
A
connected component is a group of nodes and edges that are all
connected to each other, either directly or indirectly. If a network has
a giant connected component, this means that almost every node is
reachable from almost every other node. If we ignore the direction of
the edges in the bitcoin transaction network, then it does indeed
contain a giant connected component covering over 99.9% of all nodes.
The second largest connected component has just 71 nodes.

Fourteen degrees of separation

Six
degrees of separation is the theory that everyone on the planet is
connected to everyone else through a chain of acquaintances with no more than six hops.
In network science terminology, this translates to the theory that the
social network of the human race has diameter six. Facebook reported that the effective diameter (covering 90% of all pairs of users) of its social network is five and is decreasing with time.
The
equivalent number for the bitcoin transaction network is fourteen and
is increasing with time. That is, across 90% of all pairs of
transactions, the shortest path between them in the transaction network,
ignoring directionality, is at most fourteen hops. The increasing value
is likely due to the fact that, unlike the Facebook social network,
there is no preferential attachment.
New nodes are connected to existing nodes whose corresponding
transactions are not yet fully redeemed. In other words, the transaction
network is growing at the frontier only.

The first currency with a ledger

Surprisingly,
bitcoin is not the first currency with a ledger from which we can model
the transfer of value. The Tomamae-cho community currency was
introduced into the Hokkaido Prefecture in Japan for a three-month
period during 2004-05 in a bid to revitalise the local economy. The
Tomamae-cho system involved gift certificates that were reusable and
legally redeemable into yen. There was an entry space on the reverse of
each certificate for recipients to record transaction dates, their names
and addresses, and the purposes of use, up to a maximum of five
recipients.
Researchers collected these certificates in order to
derive a network structure that represented the flow of currency during
the period. They showed, for example, that the network had small world properties.
A network representation of the transfer of value with a community currency.
A network representation of the transfer of value with a community currency.
Source: Network Analyses of the Circulation Flow of Community Currency
The
block chain is a digital equivalent to the Tomamae-cho certificates. It
does not contain information such as names and addresses or the
purposes of use. However, it has other properties that make it suitable
for analysing the transfer of value including its accuracy, size, and
completeness.
The application of network analysis to the block
chain is an under-explored, yet fascinating area. There are a handful of
academic studies but very little in the way of software and tools to
open it up to a wider audience. QuantaBytes  is an Irish startup, founded by the author,
developing a suite of tools for analysing and visualising bitcoin’s
block chain. By understanding the structure and evolution of the block
chain, we can better understand bitcoin’s usage patterns, economy, and
the growth of the system as a whole.
Network image via Shutterstock

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Satoshi

Bitcoin Regulation Update – 03/07/14

(BitcoinMagazine) This
week saw the outing (or not) of Satoshi Nakamoto, Bitcoin’s alleged
inventor, who is said to have abruptly disappeared from the online
forums he was known to frequent in Bitcoin’s early days. Though the man
alleged to be Nakamoto, who was living under a different name in the
United States, denied involvement with Bitcoin, Newsweek, the
publication that broke the story, stands behind their work. The early
response from the online Bitcoin community could best be described as a
low grade form of moral outrage, combined with a dash of horror. What
seems to have upset Bitcoiners most is the fact that a media outlet was
able to identify and publicly name a person who clearly was not
interested in being identified, using little more than public
information and basic detective work. To the extent that the majority of
crypto enthusiasts value privacy, if not anonymity, the Satoshi
Nakamoto affair does not bode well.
Canada-based Bitcoin exchange Vault of Satoshi announced via Facebook on Thursday that it would discontinue
support for US customers due to an “increasingly hostile” regulatory
environment. The exchange, which connects users with others looking to
trade crypto currencies for fiat currencies, claimed to be facing
considerable difficulties complying with FinCEN’s anti-money laundering
rules, not the least of which was FinCEN’s policy disallowing the filing
of paper reports by money service businesses and the seeming
incompatibility of the online reporting system with foreign businesses.
The decision to abandon the US market entirely seems to be a fairly
drastic response to US law, which could rightly be described as overly
complicated. Vault of Satoshi is neither the first nor the only non-US
based company to face US regulatory requirements, so it isn’t clear why
it seems to be having unusual difficulty in this area.  The company’s
Bitcoin to US dollar volume on Friday stood at 280 coins as of 5:00 PM
CST, compared to 314 for Bitcoin to Canadian dollars. Under the new
policy, US traders will be unable to deposit or withdraw cash from the
exchange, but will be permitted to trade coins.
Yet another exchange, this time Canadian company Flexcoin, informed customers this week that it is insolvent
as the result of a hack induced theft and would have no choice but to
cease operations. The exchange lost an estimated $500,000 worth of coins
in its hot wallet, but a spokesman said that customer coins in cold
storage would be returned to their owners.  Flexcoin referred to its
terms of service, reminding its customers that they agreed not to hold
Flexcoin liable for theft, while informing everyone else that they were
out of luck. The operative verbiage states that “Flexcoin is not
responsible for insuring any bitcoins stored in the Flexcoin system.”
Whether this will be sufficient to ward off civil liability remains to
be seen.
Her Majesty’s Revenue and Customs service in the United Kingdom has reportedly dropped
a plan to apply value added taxes to mined bitcoins and Bitcoin
exchange transactions. However, the treasury maintained in a brief
delivered to British lawmakers that the 20% VAT still applies to goods
and services purchased with bitcoins, just the same as it would if those
same goods and services were purchased with Pounds. After a careful
review, HM Treasury was more likely to have discovered the near
impossibility of taxing Bitcoin at the point of exchange or the point of
creation, than to have determined that it falls outside the scope of
transactions subject to the tax.  Merchants, on the other hand, are
already accustomed to collecting VAT and equipped with the
infrastructure both to report it and to comply with the audit
requirements of the British government. The UK has developed a
reputation in the Bitcoin community of late for being comparatively
friendly to crypto currency from a regulatory standpoint and more
accessible than US regulators.
Vietnam’s Communist government has officially banned
all Bitcoin transactions. The Vietnamese central bank announced the
policy, citing Bitcoin’s alleged role in promoting money laundering and
other criminal activity. The bank did not specify how the ban would be
enforced or what the penalties for non-compliance would be. The
Vietnamese government maintains restrictive capital controls (ostensibly
to protect the Dong against speculators), that Bitcoin could be used to
subvert. Few exchanges offer the ability to convert from Bitcoin to the
Vietnamese Dong.  However, other currencies, such as the US dollar, are
in common use on Vietnam’s streets, especially in urban centers.
Japan has announced
that it will not attempt to regulate Bitcoin transactions carried out
within its borders on the grounds that bitcoins are not considered a
currency. However, Japanese banks will be prohibited from buying or
selling bitcoins. The Japanese government also clarified that it intends
to treat Bitcoin as a commodity and subject it to the applicable
taxation regime. Japan is the home of Mt. Gox, the collapsed Bitcoin
exchange which is currently the subject of a bankruptcy filing in that
country, along with at least one criminal probe and numerous civil
suits.

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Satoshi