The bitcoin network is a peer-to-peer payment network that operates on a cryptographic protocol. Users send and receive bitcoins, the units of currency, by broadcasting digitally signed messages to the network using bitcoin cryptocurrency wallet software. Transactions are recorded into a distributed, replicated public database known as the blockchain, with consensus achieved by a proof-of-work system called mining. Satoshi Nakamoto, the designer of bitcoin claimed that design and coding of bitcoin began in 2007. The project was released in 2009 as open source software. The network requires the minimal structure to share transactions. An ad hoc decentralized network of volunteers is sufficient. Messages are broadcast on a best effort basis, and nodes can leave and rejoin the network at will. Upon reconnection, a node downloads and verifies new blocks from other nodes to complete its local copy of the blockchain. A bitcoin is defined by a sequence of digitally signed transactions that began with the bitcoin's creation, as a block reward. The owner of a bitcoin transfers it by digitally signing it over to the next owner using a bitcoin transaction, much like endorsing a traditional bank check. A payee can examine each previous transaction to verify the chain of ownership. Unlike traditional check endorsements, bitcoin transactions are irreversible, which eliminates the risk of chargeback fraud. Although it is possible to handle bitcoins individually, it would be unwieldy to require a separate transaction for every bitcoin in a transaction. Transactions are therefore allowed to contain multiple inputs and outputs, allowing bitcoins to be split and combined. Common transactions will have either a single input from a larger previous transaction or multiple inputs combining smaller amounts, and one or two outputs: one for the payment, and one returning the change, if any, to the sender. Any difference between the total input and output amounts of a transaction goes to miners as a transaction fee. In 2013, Mark Gimein estimated electricity consumption to be about 40.9 megawatts (982 megawatt-hours a day). In 2014, Hass McCook estimated 80.7 megawatts (80,666 kW). As of 2015, The Economist estimated that even if all miners used modern facilities, the combined electricity consumption would be 166.7 megawatts (1.46 terawatt-hours per year). To lower the costs, bitcoin miners have set up in places like Iceland where geothermal energy is cheap and cooling Arctic air is free. Chinese bitcoin miners are known to use hydroelectric power in Tibet to reduce electricity costs. Various potential attacks on the bitcoin network and its use as a payment system, real or theoretical, have been considered. The bitcoin protocol includes several features that protect it against some of those attacks, such as unauthorized spending, double spending, forging bitcoins, and tampering with the blockchain. Other attacks, such as theft of private keys, require due care by users.
Paxos Standard (PAX) was created by Paxos, a financial technology company on a mission to modernize finance by mobilizing assets at the speed of the internet. Paxos was the first virtual currency company to receive a charter from the New York State Department of Financial Services. As a chartered limited purpose trust company with fiduciary powers under the Banking Law, Paxos is able to offer regulated services in the crypto-asset and virtual commodities space. The Paxos team comes from a wide variety of backgrounds with a diverse array of experiences ranging from Wall Street to Silicon Valley. It’s led by CEO and co-founder Charles Cascarilla, who has spent his career as a customer, analyst, investor and now creator of financial technology. Paxos describes itself as “the first regulated Trust company with blockchain expertise”, and it is using that expertise to create a modern settlement solution that can eliminate risk and simplify settlements. What many people may not know about Paxos is that it was actually founded in 2012 as Paxos Trust Company, and that for most of its life it ran the cryptocurrency exchange itBit, which is still operates. The creation of Paxos was a pivot from an exchange platform to a company focused on creating a modern settlement platform using blockchain technology. Paxos has become the most widely adopted cryptocurrency in the fastest time frame, with support from over 20 exchanges and OTC desks in the first five weeks of its existence. It’s been picked up and listed by six of the top ten cryptocurrency exchanges, Binance, OKEx, Gate.io, ZB, KuCoin and DigiFinex. These exchanges are offering PAX as an alternative to the controversial Tether. Unlike the controversy surrounding the people who control Tether, there is no such obscurity when it comes to the people behind Paxos. The CEO and co-founder is Charles Cascarilla. He has over 15 years in financial services and has co-founded Cedar Hill asset management back in 2005. He has also worked and Bank of America and Goldman Sachs prior to that. The Paxos Standard (PAX) is the first digital asset to be issued by a financial institution and to be fully secured by the U.S. dollar. While other similar stablecoins have existed, there has been no proof of full U.S. dollar reserves, nor have these earlier assets been issued by a financial institution. The Paxos team has been fairly clear in declaring the different base that PAX is working from.