Every block comprises of the following components:DataHash of the blockHash of the previous blockThe
Every block comprises of the following components:DataHash of the blockHash of the previous blockThe data recorded in a block depends on the blockchain type.For example, Bitcoin Blockchain saves the details about a transaction such as a receiver, sender and number of coins.A hash of the block is similar to a fingerprint(always unique) that identifies the block and its contents.Once a block gets created, a hash gets generated. Hash value gets changed with every change in the block.Therefore, hash values help in detecting the changes made to blocks.Every new block contains the current hash and the hash of the previous block, which implies that every block is linked to each other and creates a chain of blocks, known as “Blockchain.” -- source link