Block chain may refer to:
A block chain or blockchain is a permissionless distributed database based on the bitcoin protocol that maintains a continuously growing list of data records hardened against tampering and revision, even by its operators. The initial and most widely known application of block chain technology is the public ledger of transactions for bitcoin, which has been the inspiration for similar implementations often known as altchains.
The block chain consists of blocks that hold timestamped batches of recent valid transactions. Each block includes the hash of the prior block, linking the blocks together. The linked blocks form a chain, with each additional block reinforcing those before it, thus giving the database type its name.
A block chain implementation consists of two kinds of records: transactions and blocks.
Transactions are the content to be stored in the block chain.Transactions are created by participants using the system. In the case of cryptocurrencies, a transaction is created anytime a bitcoin owner sends cryptocurrency to another.
Novokuznetsk (Russian: Новокузнецк; IPA: [nəvəkʊzˈnʲɛtsk]; literally: "new smith's") is a city in Kemerovo Oblast in south-western Siberia, Russia. Population: 547,904 (2010 Census); 549,870 (2002 Census); 599,947 (1989 Census).
Founded in 1618 by men from Tomsk as a Cossack ostrog (fort) on the Tom River, it was initially called Kuznetsky ostrog (Кузне́цкий острог). It became the seat of Kuznetsky Uyezd in 1622.Kuznetsk (Кузне́цк) was granted town status in 1689. It was here that Fyodor Dostoevsky married his first wife, Maria Isayeva (1857).Joseph Stalin's rapid industrialization of the Soviet Union transformed the sleepy town into a major coal mining and industrial center in the 1930s. It merged with Sad Gorod in 1931. In 1931–1932, the city was known as Novokuznetsk and between 1932–1961 as Stalinsk (Ста́линск), after Stalin.
Within the framework of administrative divisions, Novokuznetsk serves as the administrative center of Novokuznetsky District, even though it is not a part of it. As an administrative division, it is incorporated separately as Novokuznetsk City Under Oblast Jurisdiction—an administrative unit with the status equal to that of the districts. As a municipal division, Novokuznetsk City Under Oblast Jurisdiction is incorporated as Novokuznetsky Urban Okrug.