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Bitcoin (English bitcoin; BTC, XBT) is a decentralized electronic payment system, the concept of which was published in 2008 by Satoshi Nakamoto and implemented by him as open software in 2009. Later, such systems began to be called cryptocurrencies.

Bitcoin has no centralized management and no issuers. Transactions with a digital signature between two addresses are transmitted to these nodes of the peer-to-peer network, and the data about the movement of bitcoins is stored in the blockchain, a chain of cryptographically linked blocks, which, once created, is very expensive to change or forge. Cryptographic methods are used to prevent the possibility of spending other people's bitcoins because of double use of their own.

Litecoin (from English Lite - "light", English Coin - "coin") is a fork of Bitcoin, a peer-to-peer electronic payment system that uses the cryptocurrency of the same name.

The creation and sending of Litecoin is based on a protocol without centralized administration based on Bitcoin technology. The program has an open source code.

Litecoin was conceived by the developers as an evolution of Bitcoin and has a number of differences from it. As of October 18, 2015, 1 LTC was worth approximately 3 USD on the BTC-E exchange and was the second largest cryptocurrency by market capitalization in the world. Litecoins can be used to exchange for bitcoin or regular money at exchangers, as well as to pay electronically for goods and services at merchants willing to accept them.

Ethereum (from the English Ether - "ether", ETH code), Etherium, (often simply "ether" or "ether") is a cryptocurrency and a platform for creating decentralized online services (DApps) based on the blockchain, which work on the basis of smart contracts Implemented as a single decentralized virtual machine. The idea was formed by Vitalik Buterin in 2013. ETH is the native currency for the Ethereum platform and also works as a transaction fee to miners on the Ethereum network.

Ethereum pioneered the use of blockchain-based smart or intelligent contracts. When running on the blockchain, a smart contract becomes like an independent computer program that automatically executes when certain conditions are met. On the blockchain, smart contracts allow code to run exactly as programmed without any possibility of downtime, censorship, fraud, or third-party interference. It can facilitate the exchange of money, content, property, shares or any other value.

The Ethereum network went public on July 30, 2015, with the release of the first 72 million Ethereums. Because Ethereum greatly simplifies and lowers the cost of blockchain implementation, it is being implemented by both major players such as Microsoft, IBM, Acronis, Sberbank of Russia, the R3 banking consortium, and new startups.

Tether (symbol ₮) is a cryptocurrency token issued by Tether Limited, which claims that its value is 80% backed by US dollar reserves in bank accounts or their equivalent. The main idea of ​​the developers of this token is to provide participants of the cryptocurrency market with the opportunity to use a stable digital asset ("stablecoin"), the rate of which is tied to the rate of the US dollar and does not experience such strong fluctuations as the rates of other cryptocurrencies. Tether is released on the Omni Layer platform, which is a superstructure on top of the Bitcoin blockchain.

eCurrency - the main cryptocurrency of the Mercury community, which will gradually become the core of all projects and the internal economy of the community

eCurrency (ECR) is a self-financing decentralized cryptocurrency designed to facilitate international B2C and B2B transactions. The independence of the ECR blockchain ensures fast transaction speeds and zero fees for today's, tomorrow's companies and their customers.