Years of regulation have stifled tech development in medical data management, while an array of incompatible back-end systems and fragmented data trails limit patients’ ability to engage with their medical history. We have developed MedRec, an open-source program that applies blockchain smart contracts to create a decentralized content-management system for healthcare data, and have piloted the project with Beth Israel Deaconness Medical Center. MedRec sets up an authentication log to govern medical record access, while providing means for auditability and data sharing. Its modular design integrates with providers’ existing, local data storage solutions, enabling interoperability. The system engages directly with medical researchers, who provide the “mining” needed to secure and sustain the authentication log on a private, Ethereum network. Read the whitepaper here.
EOS is yet another Ethereum competitor that uses a “Delegated Proof of Stake” (DPOS) system, which supposedly improves on the regular PoS system because users can delegate their voting rights to others in the network in order to decrease transaction verification times and make the network run more efficiently.
Zcash is the next-generation of the Zerocoin protocol, which aimed to create the first truly anonymous cryptocurrency. It uses a recently invented breakthrough technology called Zero-Knowledge Succinct Non-Interactive Argument of Knowledge (zk-SNARK), and it’s a novel form of zero-knowledge cryptography.
Buyer expectations may matter more to regulators than technical hair-splitting. Todd Kornfeld, a securities specialist at the law firm Pepper Hamilton, finds precedent in the landmark 1946 case SEC v. W.J. Howey Co. Howey, a Florida orange-growing operation, was selling grove plots and accompanying “service contracts” that paid faraway landowners based on the orange harvest’s success. When the SEC closed in, Howey argued they were selling real estate and services, not a security. But the Supreme Court ultimately disagreed, establishing what’s known as the Howey test: In essence, if you give someone else money in the hope that their activities will generate a profit on your behalf, you’ve just bought a security, no matter what the seller calls it.
^ a b Raeesi, Reza (2015-04-23). “The Silk Road, Bitcoins and the Global Prohibition Regime on the International Trade in Illicit Drugs: Can this Storm Be Weathered?”. Glendon Journal of International Studies / Revue d’études internationales de Glendon. 8 (1–2). ISSN 2291-3920. Archived from the original on 2015-12-22.
Even though his friends and most of his relatives questioned his enthusiasm, Groce didn’t hide his confidence. He liked to wear a T-shirt he designed that had the words “Bitcoin Millionaire” emblazoned in gold on the chest. He admitted that people made fun of him for it. “My fiancée keeps saying she’d rather I was just a regular old millionaire,” he said. “But maybe I will be someday, if these rigs keep working for me.” ♦
These characteristics make Bitcoin fundamentally different from a fiat currency, which is backed by the full faith and credit of its government. Fiat currency issuance is a highly centralized activity supervised by a nation’s central bank. While the bank regulates the amount of currency issued in accordance with its monetary policy objectives, there is theoretically no upper limit to the amount of such currency issuance. In addition, local currency deposits are generally insured against bank failures by a government body. Bitcoin, on the other hand, has no such support mechanisms. The value of a Bitcoin is wholly dependent on what investors are willing to pay for it at a point in time. As well, if a Bitcoin exchange folds up, clients with Bitcoin balances have no recourse to get them back.
The first decentralized cryptocurrency, bitcoin, was created in 2009 by pseudonymous developer Satoshi Nakamoto. It used SHA-256, a cryptographic hash function, as its proof-of-work scheme. In April 2011, Namecoin was created as an attempt at forming a decentralized DNS, which would make internet censorship very difficult. Soon after, in October 2011, Litecoin was released. It was the first successful cryptocurrency to use scrypt as its hash function instead of SHA-256. Another notable cryptocurrency, Peercoin was the first to use a proof-of-work/proof-of-stake hybrid. IOTA was the first cryptocurrency not based on a blockchain, and instead uses the Tangle. Built on a custom blockchain, The Divi Project allows for easy exchange between currencies from within the wallet and the ability to use personal identifying information for transactions. Many other cryptocurrencies have been created though few have been successful, as they have brought little in the way of technical innovation. On 6 August 2014, the UK announced its Treasury had been commissioned to do a study of cryptocurrencies, and what role, if any, they can play in the UK economy. The study was also to report on whether regulation should be considered.
David Mazières is best known for co-authoring “Get Me Off Your F—–g Mailing List,” a novelty paper that in 2014 was accidentally accepted for publication by the International Journal of Advanced Computer Technology (IJACT). He currently serves as the Chief Scientist of Stellar Development Foundation, where he conducted the work presented in this talk. Everyone trying to communicate with Prof. Mazières hates Mail Avenger, his open-source anti-spam SMTP server, though his mail synchronization tool “muchsync” has garnered a less hostile reception. Despite not having a normal email address, Prof. Mazières manages to hold down additional jobs as a Professor of Computer Science at Stanford and a co-founder of Intrinsic (formerly GitStar).
There are now hundreds of other such currencies that can be traded—and new ones are regularly being created. Eastman Kodak, for example, just announced Kodakcoin, a cryptocurrency for photographers to use to manage rights and fees for their work. The company’s shares rose 245 percent on the news.
In practice, however, the available uses are rather more limited. Bitcoin can be used as a payment system for a few online transactions, and even fewer real-world ones, while other cryptocurrencies are even more juvenile than that. The excitement about the field is focused more on what it could become than what it actually is.
A cryptocurrency is a medium of exchange like normal currencies such as USD, but designed for the purpose of exchanging digital information through a process made possible by certain principles of cryptography. Cryptography is used to secure the transactions and to control the creation of new coins. The first cryptocurrency to be created was Bitcoin back in 2009. Today there are hundreds of other cryptocurrencies, often referred to as Altcoins.
An extensive library of in-depth training videos explaining how to use all the trading platforms, analytics tools, and explaining concepts and ideas that will position you as a Crypto expert in just a matter of weeks. I’ve been working hard to break down this course in the easiest to understand manner.
Hard electronic currency does not have the ability to be disputed or reversed when used. It is nearly impossible to reverse a transaction whether it is justified or not. It is very similar to cash. Advantages of this system include it being cheaper to operate, and transactions are instantaneous. Western Union, KlickEx and Bitcoin are of this type of currency.
Nakamoto had good reason to hide: people who experiment with currency tend to end up in trouble. In 1998, a Hawaiian resident named Bernard von NotHaus began fabricating silver and gold coins that he dubbed Liberty Dollars. Nine years later, the U.S. government charged NotHaus with “conspiracy against the United States.” He was found guilty and is awaiting sentencing. “It is a violation of federal law for individuals . . . to create private coin or currency systems to compete with the official coinage and currency of the United States,” the F.B.I. announced at the end of the trial.
The island nation has been exercising stringent capital controls as a part of its monetary policies adopted after the global economic crisis of 2008. It seeks to protect the outflow of Icelandic currency from the country. Under the same pretext, foreign exchange trading with bitcoin is banned in Iceland as the cryptocurrency is not compatible with the country’s Foreign Exchange Act. Interestingly, a new cryptocurrency called Auroracoin has lauched out of Iceland. Its founders wished to create a viable alternative to the present Icelandic banking system.
The developers behind the platform has promised both medium-term and long-term changes to solve this, including switching to a “Proof of Stake” (PoS) transaction verification system that’s supposed to be much more efficient than the Proof of Work (PoW) system that most cryptocurrencies, including Bitcoin, use.
As of September 2017, over a thousand cryptocurrency specifications exist; most are similar to and derive from the first fully implemented decentralized cryptocurrency, bitcoin. Within cryptocurrency systems the safety, integrity and balance of ledgers is maintained by a community of mutually distrustful parties referred to as miners: members of the general public using their computers to help validate and timestamp transactions, adding them to the ledger in accordance with a particular timestamping scheme. Miners have a financial incentive to maintain the security of a cryptocurrency ledger.
In about 2005 Telefónica and BBVA Bank launched a payment system in Spain called Mobipay which used simple short message service facilities of feature phones intended for pay-as you go services including taxis and pre-pay phone recharges via a BBVA current bank account debit.
The chief economist of Bank of England, the central bank of the United Kingdom, proposed abolition of paper currency. The Bank has also taken an interest in bitcoin. In 2016 it has embarked on a multi-year research programme to explore the implications of a central bank issued digital currency. The Bank of England has produced several research papers on the topic. One suggests that the economic benefits of issuing a digital currency on a distributed ledger could add as much as 3 percent to a country’s economic output. The Bank said that it wanted the next version of the bank’s basic software infrastructure to be compatible with distributed ledgers.
Bitcoin’s main benefits of decentralization and transaction anonymity have also made it a favored currency for a host of illegal activities including money laundering, drug peddling, smuggling and weapons procurement. This has attracted the attention of powerful regulatory and other government agencies such as the Financial Crimes Enforcement Network (FinCEN), the SEC, and even the FBI and Department of Homeland Security (DHS). In March 2013, FinCEN issued rules that defined virtual currency exchanges and administrators as money service businesses, bringing them within the ambit of government regulation. In May that year, the DHS froze an account of Mt. Gox – the largest Bitcoin exchange – that was held at Wells Fargo, alleging that it broke anti-money laundering laws. And in August, New York’s Department of Financial Services issued subpoenas to 22 emerging payment companies, many of which handled Bitcoin, asking about their measures to prevent money laundering and ensure consumer protection.
r/Aeon r/ArkEcosystem r/BTC r/BitShares r/Blackcoin r/Burstcoin r/DashPay r/Decred r/DigiByte r/Digix r/Dogecoin r/Ethos_io r/Factom r/GolemProject r/Gridcoin r/ICONOMI r/Lisk r/Maidsafe r/Mintcoin r/Modum_io/ r/Monero r/Myriadcoin r/Namecoin r/nanocurrency r/Neo r/NeosCoin r/NXT r/Nyancoins r/PIVX r/Peercoin r/Primecoin r/ReddCoin r/Siacoin r/Steemit r/Vertcoin r/WavesPlatform r/Zec
A lot of the quirks of the currency come down to the collective agreement about what constitutes “legitimacy”. For instance, since the first bitcoin was created in 2009, the total number in existence has been growing slowly, at a declining rate, ensuring that at some point around 2140, the 21 millionth bitcoin will be mined, and no more will ever be created.
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.
As of November 2017, almost 17 mln Bitcoins have been mined and distributed. However, as rewards are going to become smaller and smaller, every single Bitcoin mined will become exponentially more and more valuable.
Tether is a special kind of cryptocurrency in that its value is anchored to that of the U.S. dollar. That means it allows people to store their USD in a cryptocurrency that doesn’t see the same kind of volatility cryptocurrencies see on a daily basis.
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