Hello guys, Can you help me?
help... what?
How does a block is recognized in the Blockchain approach?
Every block in this online ledger basically consists of a hash pointer which acts as a link to the block which is prior to it, transaction data and in fact a stamp of time
Is it possible to modify the data once it is written in a block?
No, It's not possible to do so. In case any modification is required, the organization simply has to erase the information from all other blocks too. It is because of no other reason than this, data must be given the extreme care of while using this approach.
