The best known crypto currency is Bitcoin. It is traded by free thinkers and hackers as the currency of the future. Various other crypto currencies have been initiated, but none of them have been able to assert themselves alongside Bitcoin.
The assets are secured by the stringent use of cryptography. The technical basis is the blockchain; each transaction is combined in a data block and attached to the blockchain. The hash value of the preceding data record is stored in the following data record. This cryptographic concatenation protects the blockchain and thus the crypto currency against subsequent manipulation (integrity).