Various cryptocurrency logos.

A cryptocurrency (or crypto currency) is a digital asset designed to work as a medium of exchange that uses strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.[1][2][3] Cryptocurrencies use decentralized control as opposed to centralized digital currency and central banking systems.[4]
The decentralized control of each cryptocurrency works through distributed ledger technology, typically a blockchain, that serves as a public financial transaction database.[5]
Bitcoin, first released as open-source software in 2009, is generally considered the first decentralized cryptocurrency.[6] Since the release of bitcoin, over 6,000 altcoins (alternative variants of bitcoin, or other cryptocurrencies) have been created.

Above text source: From Wikipedia, the free encyclopedia 

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CryptoTalk - bitcoin forum about crypto.
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Cryptocurrency market cap rankings, charts, and more.

Real-time cryptocurrency market cap rankings, trading charts, and more.

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As of 2019-07-11 10:52 AM +0200 CEST, 1 Bitcoin = 10.186 euro.

As of 07-11-2019 20:26 weekly average for 1 BTC = €8327.6