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.
Bancor is a blockchain protocol that allows users to convert between different tokens directly as opposed to exchanging them on cryptocurrency markets. The project offers a network, which we’ll discuss soon, that works to bring liquidity to the majority of tokens that lack a consistent supply/demand in exchanges. That network is built on smart contracts and a new class of cryptocurrencies that the team calls “Smart Tokens.” Bancor is looking to provide support to the illiquidity that currently exists within the cryptocurrency market. Illiquidity isn’t so much an issue for top coins like Bitcoin or Ethereum because there are always buyers and sellers looking to exchange those coins. It is definitely an issue, however, for the thousands of other tokens that may serve legitimate decentralized purposes but haven’t attracted enough attention in the market to be liquid. Bancor’s protocol uses smart contracts to create Smart Tokens, which serve as an alternative mechanism for trading. A key characteristic of the protocol is that it doesn’t call for an exchange of tokens with a second party, as in the case of cryptocurrency exchanges. Rather, it employs Smart Tokens to convert between different ERC-20 tokens internally. These conversions take place through the blockchain’s protocol and completely outside of cryptocurrency exchanges. Smart Tokens process token conversions internally by holding reserves of other ERC20 tokens within their Smart Contract. They can then convert back and forth between those reserves as users request it. The Bancor team consists of a core Foundation Council and their Advisory Board. The Foundation Council includes four individuals based out of Zug, Switzerland. Bernard Lietaer is a Belgian civil engineer, economist, author, and professor. Lietaer specialized in monetary systems and promotes the notion of communities creating their own local currencies. Guy Benartzi serves as co-founder and is recognized for founding the gaming company, Mytopia. Benartzi also co-founded Particle Code, a development studio based in Tel Aviv, Israel. Guido Schmitz-Krummacher is an executive of the Bancor Protocol foundation that’s involved with a variety of commercial entrepreneurial ventures in Switzerland. His involvement in the crypto space includes that of Bancor as well as an executive position in crowdfunding network, Tezos (XTZ). One of the key elements of the Bancor Network is the automated pricing. This comes from the Smart Tokens’ built-in automated market makers. These automated market makers mean that the tokens’ smart contracts always buy or sell Smart Tokens from or to any user in exchange for any connector token (as well as any token found in the network). The price comes from the Bancor Formula. This formula that is responsible for balancing a Smart Token’s demand and supply while also maintaining the ratio between the token’s total value with the connector token balances. The creator of the Smart Token configures these ratios, known as the connector weight. The creator can adjust them with the goal of decreasing or increasing the liquidity level of the token. The connector weight indicates price sensitivity, or how much sells and buys affect the price movement. Any time the prices no longer syncs with prices listed on external exchanges, the arbitrageurs will quickly balance the gaps.'