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.
Aave is a decentralized lending platform that runs on Ethereum Network which offers secure, peer-to-peer lending Smart Contracts. Aave strives to break through the traditional bank loans system with a more efficient solution. Aave also uniquely allows a borrower and a lender to decide on important loan details that can eliminate the need of a middle man. Due to the elimination of middlemen, process fee for a loan does not exist on this platform. This provide convenience to any lender and borrower to create loans on their agreed terms. Decentralized lending has fixed many issues and one of the reasons why is the transparency of loan. The Ethereum network provides a transparent ledger where all transactions are available to be inspected. Secondly, it isn’t necessary to find a trusted loan provider because all collateral which is the digital asset for loans are stored and locked in a smart contract and broadcasted on the public ethereum blockchain. It is also flexible for borrower to manage the collateral by refilling or withdrawing part of it. Borrower may make such changes when the lender is notified and aware of such movement. If the lender finds out that the action is not communicated, the lender is allowed to initiate a margin call. This year, Aave has made a major upgrades in its Q1 2018. They have deployed the new development for their peer-to-peer lending application named Alpha 0.3. The development process of Alpha 0.3 has started since the early of 2017. The new release also includes a completely new user interface which targets to lower the learning curve of user experience on the app. Furthermore, the new user interface has new sections to make lending process simpler such as including a ‘My Loan’ section, collectible badges and more. Other than that, the team is also in the process of developing more updates for the smart contracts. Hence, the team has decided to provide zero-fee lending with the use of LEND token as a medium of exchange, as an alternative to borrowing in Ethereum. The purpose of this is to provide a cross-blockchain lending currency which will prompt users to use LEND as the medium of exchange.