Blockchain is a public ledger of all bitcoin negotiations that have been accomplished. The growth becomes continuous when additional blocks are added on. After that a brand new set of recordings are made. The blocks are added onto the blockchain in a linear and sequential manner. Each node ( a computer that is linked up with the Bitcoin network wherein the client does the job of validating and disseminating transactions ) receives a copy of the blockchain. It automatically will be downloaded when the person joins the bitcoin network. The blockchain has all the information needed by the client. This includes balances and addresses from the time that the client started with the bitcoin network ( starting block ) until his most latest finished block. Blocks are like the bank statements issued by the banks.
Blockchain allows two entities ( persons ) who do not know each other come to an agreement without using a third party. Because blockchain is decentralized, open and cryptographic, this process allows two entities to trust each other. Blockchain is a kind of distributed ledger that has a decentralized database which keeps all records of digital transactions. Blockchain gets a number of inputs and puts them into blocks. Each block now is chained ( connected ) together. This is done using a cryptographic signature. It now becomes a ledger that is accessible to any person who has permission to do so. Blockchains are good because it does give clients some sort of protection and benefits. It would be very difficult for cybercriminals to hack into because they will need to hack all the blocks that have been formed. The hacker would have to hack all the blocks from beginning to your last transaction. They would have to do it from the beginning ledger till the last ledger. There can be thousands of ledgers that have to be hacked. This makes it virtually impossible to do so.