Block chain
Block chain may refer to:
Block chain (database)
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.
Etymology
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.
Model
A block chain implementation consists of two kinds of records: transactions and blocks.
Transactions
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.
Abeokuta
Abeokuta is the largest city and state capital of Ogun State in southwest Nigeria. It is situated on the east bank of the Ogun River, near a group of rocky outcrops in a wooded savanna;77 kilometres (48 mi) north of Lagos by railway, or 130 kilometres (81 mi) by water. As of 2006, Abeokuta and the surrounding area had a population of 449,088.
Geography and economy
Abẹokuta lies in fertile country of wooded savanna, the surface of which is broken by masses of grey granite. It is spread over an extensive area, being surrounded by mud walls 18 miles in extent. Palm-oil, timber, rubber, yams, rice, cassava, maize, cotton, other fruits, and shea butter are the chief articles of trade. It is a key export location for cocoa, palm products, fruit, and kola nuts. Both rice and cotton were introduced by the missionaries in the 1850s and have become integral parts of the economy, along with the dye indigo. It lies below the Olumo Rock, home to several caves and shrines. The town depends on the Oyan River Dam for its water supply, which is not always dependable. The Dam is situated in the Abeokuta North local government area of Ogun State in the West of Nigeria, about 20 km north west of the state capital Abeokuta. The dam crosses the Oyan River, a tributary of the Ogun River.
