blockchain can be called a sequential block chain that is assembled and distributed concurrently. Each of these blocks consists of a ledger or ledger consisting of three elements, namely data, hash, and hash contained from the previous block. The type of data contained in this technology depends on the purpose of holding the blockchain itself. Well, while the hash contained in it consists of a signature or fingerprint. This hash is used to identify the block as well as the entire cost that contains a particular unique code. The hash contained in the previous block is the part that is able to carry traces of previous information while securing it from a blockchain chain. Blockchain can also be referred to as a new technology developed for digital data storage systems. This technology is connected to cryptography and its use itself cannot be separated from the bitcoin currency and is also known as cryptocurrency. Crypto currency or often called cryptocurrency is a digital asset which is understood as digital currency. This currency is very different from the conventional version, where cryptocurrency is used for virtual transactions via the internet or online.
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