Proof Of Work Consensus Mechanism

Bitcoin is a digital currency in an encrypted format. All bitcoin transactions are carried out, stored and verified on the blockchain, Blockchain itself is an open distributed ledger and the underlying technology behind bitcoin. It helps keeps bitcoin transactions secured and extremely difficult to tamper if not almost impossible to hack. All transactions happening on the blockchain are recorded in sequential blocks making it resistible to hack and double spending.

So, the way bitcoin blockchain is secured is though a proof of work(POW) mechanism. Proof of work involves using of significant computing power to solve hash function before blocks are verified and new blocks created on the blockchain. When the data to be verified pass through a function, the hash generated serve as a proof of work. It also enables users to check the originality of data but not create another similar data with the same hash hence, it protects the blockchain from being tampered with.

Proof of work makes it extremely impossible to change anything on the blockchain and also for any user or pool of users to do the same as this will require re mining of blocks and also enormous computing power.