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.
Youth Outreach (Chinese: 協青社)is a non-profit organization in Hong Kong established in November 1991 as a crisis intervention center for youth. In the years since its establishment, the organization has been devoting its services to help youth in critical condition or those who face major crisis in their life. The Chinese name of Youth Outreach are special in that, the first word “Qing”, meaning “green”, symbolizes youthfulness and liveliness, and its character position between “協”, meaning aid, and “社”, meaning society, creates the picture of youth being supported and cared for.
Background of the organization
Youth Outreach was formed in 1991 due to the proposal of the Hong Kong Council of Social Service (HKCSS) to work for youth life crisis prevention and youth healthy development. It provides professional counselling services to the youth as well, who are incapable of handling life crisis incidents on their own.
In 1991, the minute center of Youth Outreach situated in the quarters of Mong Kok was intended to become a one-stop crisis prevention service center under the initiative by Professor Peter Newbery.