There are many cryptocurrency exchange and all of them are not offering the same services. ExagonPay wrote a full description of over 200 most popular exchanges.

PoS Definition

Proof-of-stake (not piece of shit). The proposed future consensus algorithm to be used by Ethereum. Instead of mining in its current form, people that own ETH will be able to ‘lock up’ their ether for a short amount of time in order to ‘vote’ and generate network consensus. The plan is that these stakeholders will be rewarded with ETH by doing so.

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